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Rename tsan_interceptors.cpp into tsan_interceptors_posix.cpp
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Authored by vitalybuka on Sep 27 2019, 7:19 PM.

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Details

Reviewers

eugenis
dvyukov
kcc
jfb

Commits

rGf74f5f256848: Rename tsan_interceptors.cpp into tsan_interceptors_posix.cpp
rCRT373282: Rename tsan_interceptors.cpp into tsan_interceptors_posix.cpp
rL373282: Rename tsan_interceptors.cpp into tsan_interceptors_posix.cpp

Summary

It's needed to use __GLIBC_PREREQ from <features.h>

tsan didn't let us to include <features.h> by using --sysroot=. to disable system includes on
anything that is not named as "tsan*posix*", "tsan*mac*", "tsan*linux*".
See compiler-rt/lib/tsan/CMakeLists.txt

Diff Detail

Repository: rL LLVM

Event Timeline

vitalybuka created this revision.Sep 27 2019, 7:19 PM

Herald added projects: Restricted Project, Restricted Project. · View Herald TranscriptSep 27 2019, 7:19 PM

Herald added subscribers: llvm-commits, Restricted Project, mgorny. · View Herald Transcript

Harbormaster completed remote builds in B38697: Diff 222276.Sep 27 2019, 7:21 PM

vitalybuka added a child revision: D68177: compiler-rt: move all __GLIBC_PREREQ into own header file.Sep 27 2019, 7:26 PM

This is to prevent accidental inclusion of system headers:

Make sure that non-platform-specific files don't include any system headers.

The original decision was that sanitizer runtimes must not include any:
https://github.com/dvyukov/data-race-test-1/commit/259f05f44
Kostya was the main proponent of this.

That part is clear from the message. However do we know particular cases which it breaks? If not I propose to make all sanitizers consistent. We do that for either all or none.

Now if I need to reorder includes in sanitizer_common, I had to hack around this check.

It should break any attempts to include any system headers like <stdio.h>, <sys/types.h> etc.

In D68176#1688476, @dvyukov wrote:

It should break any attempts to include any system headers like <stdio.h>, <sys/types.h> etc.

What the patch is going to break? Should I find another solution? But it's going to be ugly, with splitting and moving tsan_interceptors.cpp
files into rtl/tsan*posix* rtl/tsan*mac* as it needs <features.h> to define __sanitizer_sigaction

It won't break anything. It's like removing -Wall flag.

vitalybuka planned changes to this revision.Sep 30 2019, 3:15 PM

Keep check

vitalybuka retitled this revision from tsan: Remove --sysroot=. from tsan to Rename tsan_interceptors.cpp into tsan_interceptors_posix.cpp.Sep 30 2019, 4:08 PM

vitalybuka edited the summary of this revision. (Show Details)

Harbormaster completed remote builds in B38775: Diff 222515.Sep 30 2019, 4:09 PM

but please update the commit message to explain why this enables us to use __GLIBC_PREREQ

This revision is now accepted and ready to land.Sep 30 2019, 4:11 PM

vitalybuka edited the summary of this revision. (Show Details)Sep 30 2019, 4:14 PM

Closed by commit rL373282: Rename tsan_interceptors.cpp into tsan_interceptors_posix.cpp (authored by vitalybuka). · Explain WhySep 30 2019, 5:59 PM

This revision was automatically updated to reflect the committed changes.

Herald added a reviewer: jfb. · View Herald TranscriptSep 30 2019, 5:59 PM

Herald added subscribers: jfb, delcypher, krytarowski, srhines. · View Herald Transcript

Revision Contents

Path

Size

compiler-rt/

trunk/

lib/

tsan/

CMakeLists.txt

2 lines

rtl/

tsan_interceptors.cpp

2849 lines

tsan_interceptors_posix.cpp

2849 lines

tsan_report.cpp

2 lines

Diff 222529

compiler-rt/trunk/lib/tsan/CMakeLists.txt

	Show All 26 Lines

	set(TSAN_SOURCES			set(TSAN_SOURCES
	rtl/tsan_clock.cpp			rtl/tsan_clock.cpp
	rtl/tsan_debugging.cpp			rtl/tsan_debugging.cpp
	rtl/tsan_external.cpp			rtl/tsan_external.cpp
	rtl/tsan_fd.cpp			rtl/tsan_fd.cpp
	rtl/tsan_flags.cpp			rtl/tsan_flags.cpp
	rtl/tsan_ignoreset.cpp			rtl/tsan_ignoreset.cpp
	rtl/tsan_interceptors.cpp			rtl/tsan_interceptors_posix.cpp
	rtl/tsan_interface.cpp			rtl/tsan_interface.cpp
	rtl/tsan_interface_ann.cpp			rtl/tsan_interface_ann.cpp
	rtl/tsan_interface_atomic.cpp			rtl/tsan_interface_atomic.cpp
	rtl/tsan_interface_java.cpp			rtl/tsan_interface_java.cpp
	rtl/tsan_malloc_mac.cpp			rtl/tsan_malloc_mac.cpp
	rtl/tsan_md5.cpp			rtl/tsan_md5.cpp
	rtl/tsan_mman.cpp			rtl/tsan_mman.cpp
	rtl/tsan_mutex.cpp			rtl/tsan_mutex.cpp
	▲ Show 20 Lines • Show All 227 Lines • Show Last 20 Lines

compiler-rt/trunk/lib/tsan/rtl/tsan_interceptors.cpp

	//===-- tsan_interceptors.cpp ---------------------------------------------===//
	//
	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
	// See https://llvm.org/LICENSE.txt for license information.
	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
	//
	//===----------------------------------------------------------------------===//
	//
	// This file is a part of ThreadSanitizer (TSan), a race detector.
	//
	// FIXME: move as many interceptors as possible into
	// sanitizer_common/sanitizer_common_interceptors.inc
	//===----------------------------------------------------------------------===//

	#include "sanitizer_common/sanitizer_atomic.h"
	#include "sanitizer_common/sanitizer_errno.h"
	#include "sanitizer_common/sanitizer_libc.h"
	#include "sanitizer_common/sanitizer_linux.h"
	#include "sanitizer_common/sanitizer_platform_limits_netbsd.h"
	#include "sanitizer_common/sanitizer_platform_limits_posix.h"
	#include "sanitizer_common/sanitizer_placement_new.h"
	#include "sanitizer_common/sanitizer_posix.h"
	#include "sanitizer_common/sanitizer_stacktrace.h"
	#include "sanitizer_common/sanitizer_tls_get_addr.h"
	#include "interception/interception.h"
	#include "tsan_interceptors.h"
	#include "tsan_interface.h"
	#include "tsan_platform.h"
	#include "tsan_suppressions.h"
	#include "tsan_rtl.h"
	#include "tsan_mman.h"
	#include "tsan_fd.h"

	using namespace __tsan;

	#if SANITIZER_FREEBSD \|\| SANITIZER_MAC
	#define stdout __stdoutp
	#define stderr __stderrp
	#endif

	#if SANITIZER_NETBSD
	#define dirfd(dirp) ((int )(dirp))
	#define fileno_unlocked(fp) \
	(((__sanitizer_FILE *)fp)->_file == -1 \
	? -1 \
	: (int)(unsigned short)(((__sanitizer_FILE *)fp)->_file))

	#define stdout ((__sanitizer_FILE*)&__sF[1])
	#define stderr ((__sanitizer_FILE*)&__sF[2])

	#define nanosleep __nanosleep50
	#define vfork __vfork14
	#endif

	#if SANITIZER_ANDROID
	#define mallopt(a, b)
	#endif

	#ifdef __mips__
	const int kSigCount = 129;
	#else
	const int kSigCount = 65;
	#endif

	#ifdef __mips__
	struct ucontext_t {
	u64 opaque[768 / sizeof(u64) + 1];
	};
	#else
	struct ucontext_t {
	// The size is determined by looking at sizeof of real ucontext_t on linux.
	u64 opaque[936 / sizeof(u64) + 1];
	};
	#endif

	#if defined(__x86_64__) \|\| defined(__mips__) \|\| SANITIZER_PPC64V1
	#define PTHREAD_ABI_BASE "GLIBC_2.3.2"
	#elif defined(__aarch64__) \|\| SANITIZER_PPC64V2
	#define PTHREAD_ABI_BASE "GLIBC_2.17"
	#endif

	extern "C" int pthread_attr_init(void *attr);
	extern "C" int pthread_attr_destroy(void *attr);
	DECLARE_REAL(int, pthread_attr_getdetachstate, void , void )
	extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
	extern "C" int pthread_key_create(unsigned key, void (destructor)(void* v));
	extern "C" int pthread_setspecific(unsigned key, const void *v);
	DECLARE_REAL(int, pthread_mutexattr_gettype, void , void )
	DECLARE_REAL(int, fflush, __sanitizer_FILE *fp)
	DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, uptr size)
	DECLARE_REAL_AND_INTERCEPTOR(void, free, void *ptr)
	extern "C" void *pthread_self();
	extern "C" void _exit(int status);
	#if !SANITIZER_NETBSD
	extern "C" int fileno_unlocked(void *stream);
	extern "C" int dirfd(void *dirp);
	#endif
	#if !SANITIZER_FREEBSD && !SANITIZER_ANDROID && !SANITIZER_NETBSD
	extern "C" int mallopt(int param, int value);
	#endif
	#if SANITIZER_NETBSD
	extern __sanitizer_FILE __sF[];
	#else
	extern __sanitizer_FILE stdout, stderr;
	#endif
	#if !SANITIZER_FREEBSD && !SANITIZER_MAC && !SANITIZER_NETBSD
	const int PTHREAD_MUTEX_RECURSIVE = 1;
	const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
	#else
	const int PTHREAD_MUTEX_RECURSIVE = 2;
	const int PTHREAD_MUTEX_RECURSIVE_NP = 2;
	#endif
	#if !SANITIZER_FREEBSD && !SANITIZER_MAC && !SANITIZER_NETBSD
	const int EPOLL_CTL_ADD = 1;
	#endif
	const int SIGILL = 4;
	const int SIGABRT = 6;
	const int SIGFPE = 8;
	const int SIGSEGV = 11;
	const int SIGPIPE = 13;
	const int SIGTERM = 15;
	#if defined(__mips__) \|\| SANITIZER_FREEBSD \|\| SANITIZER_MAC \|\| SANITIZER_NETBSD
	const int SIGBUS = 10;
	const int SIGSYS = 12;
	#else
	const int SIGBUS = 7;
	const int SIGSYS = 31;
	#endif
	void const MAP_FAILED = (void)-1;
	#if SANITIZER_NETBSD
	const int PTHREAD_BARRIER_SERIAL_THREAD = 1234567;
	#elif !SANITIZER_MAC
	const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
	#endif
	const int MAP_FIXED = 0x10;
	typedef long long_t;

	// From /usr/include/unistd.h
	# define F_ULOCK 0 /* Unlock a previously locked region. */
	# define F_LOCK 1 /* Lock a region for exclusive use. */
	# define F_TLOCK 2 /* Test and lock a region for exclusive use. */
	# define F_TEST 3 /* Test a region for other processes locks. */

	#if SANITIZER_FREEBSD \|\| SANITIZER_MAC \|\| SANITIZER_NETBSD
	const int SA_SIGINFO = 0x40;
	const int SIG_SETMASK = 3;
	#elif defined(__mips__)
	const int SA_SIGINFO = 8;
	const int SIG_SETMASK = 3;
	#else
	const int SA_SIGINFO = 4;
	const int SIG_SETMASK = 2;
	#endif

	#define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED \
	(cur_thread_init(), !cur_thread()->is_inited)

	namespace __tsan {
	struct SignalDesc {
	bool armed;
	bool sigaction;
	__sanitizer_siginfo siginfo;
	ucontext_t ctx;
	};

	struct ThreadSignalContext {
	int int_signal_send;
	atomic_uintptr_t in_blocking_func;
	atomic_uintptr_t have_pending_signals;
	SignalDesc pending_signals[kSigCount];
	// emptyset and oldset are too big for stack.
	__sanitizer_sigset_t emptyset;
	__sanitizer_sigset_t oldset;
	};

	// The sole reason tsan wraps atexit callbacks is to establish synchronization
	// between callback setup and callback execution.
	struct AtExitCtx {
	void (*f)();
	void *arg;
	};

	// InterceptorContext holds all global data required for interceptors.
	// It's explicitly constructed in InitializeInterceptors with placement new
	// and is never destroyed. This allows usage of members with non-trivial
	// constructors and destructors.
	struct InterceptorContext {
	// The object is 64-byte aligned, because we want hot data to be located
	// in a single cache line if possible (it's accessed in every interceptor).
	ALIGNED(64) LibIgnore libignore;
	__sanitizer_sigaction sigactions[kSigCount];
	#if !SANITIZER_MAC && !SANITIZER_NETBSD
	unsigned finalize_key;
	#endif

	BlockingMutex atexit_mu;
	Vector<struct AtExitCtx *> AtExitStack;

	InterceptorContext()
	: libignore(LINKER_INITIALIZED), AtExitStack() {
	}
	};

	static ALIGNED(64) char interceptor_placeholder[sizeof(InterceptorContext)];
	InterceptorContext *interceptor_ctx() {
	return reinterpret_cast<InterceptorContext*>(&interceptor_placeholder[0]);
	}

	LibIgnore *libignore() {
	return &interceptor_ctx()->libignore;
	}

	void InitializeLibIgnore() {
	const SuppressionContext &supp = *Suppressions();
	const uptr n = supp.SuppressionCount();
	for (uptr i = 0; i < n; i++) {
	const Suppression *s = supp.SuppressionAt(i);
	if (0 == internal_strcmp(s->type, kSuppressionLib))
	libignore()->AddIgnoredLibrary(s->templ);
	}
	if (flags()->ignore_noninstrumented_modules)
	libignore()->IgnoreNoninstrumentedModules(true);
	libignore()->OnLibraryLoaded(0);
	}

	// The following two hooks can be used by for cooperative scheduling when
	// locking.
	#ifdef TSAN_EXTERNAL_HOOKS
	void OnPotentiallyBlockingRegionBegin();
	void OnPotentiallyBlockingRegionEnd();
	#else
	SANITIZER_WEAK_CXX_DEFAULT_IMPL void OnPotentiallyBlockingRegionBegin() {}
	SANITIZER_WEAK_CXX_DEFAULT_IMPL void OnPotentiallyBlockingRegionEnd() {}
	#endif

	} // namespace __tsan

	static ThreadSignalContext SigCtx(ThreadState thr) {
	ThreadSignalContext ctx = (ThreadSignalContext)thr->signal_ctx;
	if (ctx == 0 && !thr->is_dead) {
	ctx = (ThreadSignalContext)MmapOrDie(sizeof(ctx), "ThreadSignalContext");
	MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
	thr->signal_ctx = ctx;
	}
	return ctx;
	}

	ScopedInterceptor::ScopedInterceptor(ThreadState thr, const char fname,
	uptr pc)
	: thr_(thr), pc_(pc), in_ignored_lib_(false), ignoring_(false) {
	Initialize(thr);
	if (!thr_->is_inited) return;
	if (!thr_->ignore_interceptors) FuncEntry(thr, pc);
	DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
	ignoring_ =
	!thr_->in_ignored_lib && libignore()->IsIgnored(pc, &in_ignored_lib_);
	EnableIgnores();
	}

	ScopedInterceptor::~ScopedInterceptor() {
	if (!thr_->is_inited) return;
	DisableIgnores();
	if (!thr_->ignore_interceptors) {
	ProcessPendingSignals(thr_);
	FuncExit(thr_);
	CheckNoLocks(thr_);
	}
	}

	void ScopedInterceptor::EnableIgnores() {
	if (ignoring_) {
	ThreadIgnoreBegin(thr_, pc_, /save_stack=/false);
	if (flags()->ignore_noninstrumented_modules) thr_->suppress_reports++;
	if (in_ignored_lib_) {
	DCHECK(!thr_->in_ignored_lib);
	thr_->in_ignored_lib = true;
	}
	}
	}

	void ScopedInterceptor::DisableIgnores() {
	if (ignoring_) {
	ThreadIgnoreEnd(thr_, pc_);
	if (flags()->ignore_noninstrumented_modules) thr_->suppress_reports--;
	if (in_ignored_lib_) {
	DCHECK(thr_->in_ignored_lib);
	thr_->in_ignored_lib = false;
	}
	}
	}

	#define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
	#if SANITIZER_FREEBSD
	# define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION(func)
	# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func)
	# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func)
	#elif SANITIZER_NETBSD
	# define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION(func)
	# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func) \
	INTERCEPT_FUNCTION(__libc_##func)
	# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func) \
	INTERCEPT_FUNCTION(__libc_thr_##func)
	#else
	# define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION_VER(func, ver)
	# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func)
	# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func)
	#endif

	#define READ_STRING_OF_LEN(thr, pc, s, len, n) \
	MemoryAccessRange((thr), (pc), (uptr)(s), \
	common_flags()->strict_string_checks ? (len) + 1 : (n), false)

	#define READ_STRING(thr, pc, s, n) \
	READ_STRING_OF_LEN((thr), (pc), (s), internal_strlen(s), (n))

	#define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))

	struct BlockingCall {
	explicit BlockingCall(ThreadState *thr)
	: thr(thr)
	, ctx(SigCtx(thr)) {
	for (;;) {
	atomic_store(&ctx->in_blocking_func, 1, memory_order_relaxed);
	if (atomic_load(&ctx->have_pending_signals, memory_order_relaxed) == 0)
	break;
	atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
	ProcessPendingSignals(thr);
	}
	// When we are in a "blocking call", we process signals asynchronously
	// (right when they arrive). In this context we do not expect to be
	// executing any user/runtime code. The known interceptor sequence when
	// this is not true is: pthread_join -> munmap(stack). It's fine
	// to ignore munmap in this case -- we handle stack shadow separately.
	thr->ignore_interceptors++;
	}

	~BlockingCall() {
	thr->ignore_interceptors--;
	atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
	}

	ThreadState *thr;
	ThreadSignalContext *ctx;
	};

	TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
	SCOPED_TSAN_INTERCEPTOR(sleep, sec);
	unsigned res = BLOCK_REAL(sleep)(sec);
	AfterSleep(thr, pc);
	return res;
	}

	TSAN_INTERCEPTOR(int, usleep, long_t usec) {
	SCOPED_TSAN_INTERCEPTOR(usleep, usec);
	int res = BLOCK_REAL(usleep)(usec);
	AfterSleep(thr, pc);
	return res;
	}

	TSAN_INTERCEPTOR(int, nanosleep, void req, void rem) {
	SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
	int res = BLOCK_REAL(nanosleep)(req, rem);
	AfterSleep(thr, pc);
	return res;
	}

	TSAN_INTERCEPTOR(int, pause, int fake) {
	SCOPED_TSAN_INTERCEPTOR(pause, fake);
	return BLOCK_REAL(pause)(fake);
	}

	static void at_exit_wrapper() {
	AtExitCtx *ctx;
	{
	// Ensure thread-safety.
	BlockingMutexLock l(&interceptor_ctx()->atexit_mu);

	// Pop AtExitCtx from the top of the stack of callback functions
	uptr element = interceptor_ctx()->AtExitStack.Size() - 1;
	ctx = interceptor_ctx()->AtExitStack[element];
	interceptor_ctx()->AtExitStack.PopBack();
	}

	Acquire(cur_thread(), (uptr)0, (uptr)ctx);
	((void(*)())ctx->f)();
	InternalFree(ctx);
	}

	static void cxa_at_exit_wrapper(void *arg) {
	Acquire(cur_thread(), 0, (uptr)arg);
	AtExitCtx ctx = (AtExitCtx)arg;
	((void()(void arg))ctx->f)(ctx->arg);
	InternalFree(ctx);
	}

	static int setup_at_exit_wrapper(ThreadState thr, uptr pc, void(f)(),
	void arg, void dso);

	#if !SANITIZER_ANDROID
	TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
	if (in_symbolizer())
	return 0;
	// We want to setup the atexit callback even if we are in ignored lib
	// or after fork.
	SCOPED_INTERCEPTOR_RAW(atexit, f);
	return setup_at_exit_wrapper(thr, pc, (void(*)())f, 0, 0);
	}
	#endif

	TSAN_INTERCEPTOR(int, __cxa_atexit, void (f)(void a), void arg, void dso) {
	if (in_symbolizer())
	return 0;
	SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
	return setup_at_exit_wrapper(thr, pc, (void(*)())f, arg, dso);
	}

	static int setup_at_exit_wrapper(ThreadState thr, uptr pc, void(f)(),
	void arg, void dso) {
	AtExitCtx ctx = (AtExitCtx)InternalAlloc(sizeof(AtExitCtx));
	ctx->f = f;
	ctx->arg = arg;
	Release(thr, pc, (uptr)ctx);
	// Memory allocation in __cxa_atexit will race with free during exit,
	// because we do not see synchronization around atexit callback list.
	ThreadIgnoreBegin(thr, pc);
	int res;
	if (!dso) {
	// NetBSD does not preserve the 2nd argument if dso is equal to 0
	// Store ctx in a local stack-like structure

	// Ensure thread-safety.
	BlockingMutexLock l(&interceptor_ctx()->atexit_mu);

	res = REAL(__cxa_atexit)((void ()(void a))at_exit_wrapper, 0, 0);
	// Push AtExitCtx on the top of the stack of callback functions
	if (!res) {
	interceptor_ctx()->AtExitStack.PushBack(ctx);
	}
	} else {
	res = REAL(__cxa_atexit)(cxa_at_exit_wrapper, ctx, dso);
	}
	ThreadIgnoreEnd(thr, pc);
	return res;
	}

	#if !SANITIZER_MAC && !SANITIZER_NETBSD
	static void on_exit_wrapper(int status, void *arg) {
	ThreadState *thr = cur_thread();
	uptr pc = 0;
	Acquire(thr, pc, (uptr)arg);
	AtExitCtx ctx = (AtExitCtx)arg;
	((void()(int status, void arg))ctx->f)(status, ctx->arg);
	InternalFree(ctx);
	}

	TSAN_INTERCEPTOR(int, on_exit, void(f)(int, void), void *arg) {
	if (in_symbolizer())
	return 0;
	SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
	AtExitCtx ctx = (AtExitCtx)InternalAlloc(sizeof(AtExitCtx));
	ctx->f = (void(*)())f;
	ctx->arg = arg;
	Release(thr, pc, (uptr)ctx);
	// Memory allocation in __cxa_atexit will race with free during exit,
	// because we do not see synchronization around atexit callback list.
	ThreadIgnoreBegin(thr, pc);
	int res = REAL(on_exit)(on_exit_wrapper, ctx);
	ThreadIgnoreEnd(thr, pc);
	return res;
	}
	#define TSAN_MAYBE_INTERCEPT_ON_EXIT TSAN_INTERCEPT(on_exit)
	#else
	#define TSAN_MAYBE_INTERCEPT_ON_EXIT
	#endif

	// Cleanup old bufs.
	static void JmpBufGarbageCollect(ThreadState *thr, uptr sp) {
	for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
	JmpBuf *buf = &thr->jmp_bufs[i];
	if (buf->sp <= sp) {
	uptr sz = thr->jmp_bufs.Size();
	internal_memcpy(buf, &thr->jmp_bufs[sz - 1], sizeof(*buf));
	thr->jmp_bufs.PopBack();
	i--;
	}
	}
	}

	static void SetJmp(ThreadState *thr, uptr sp) {
	if (!thr->is_inited) // called from libc guts during bootstrap
	return;
	// Cleanup old bufs.
	JmpBufGarbageCollect(thr, sp);
	// Remember the buf.
	JmpBuf *buf = thr->jmp_bufs.PushBack();
	buf->sp = sp;
	buf->shadow_stack_pos = thr->shadow_stack_pos;
	ThreadSignalContext *sctx = SigCtx(thr);
	buf->int_signal_send = sctx ? sctx->int_signal_send : 0;
	buf->in_blocking_func = sctx ?
	atomic_load(&sctx->in_blocking_func, memory_order_relaxed) :
	false;
	buf->in_signal_handler = atomic_load(&thr->in_signal_handler,
	memory_order_relaxed);
	}

	static void LongJmp(ThreadState thr, uptr env) {
	uptr sp = ExtractLongJmpSp(env);
	// Find the saved buf with matching sp.
	for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
	JmpBuf *buf = &thr->jmp_bufs[i];
	if (buf->sp == sp) {
	CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);
	// Unwind the stack.
	while (thr->shadow_stack_pos > buf->shadow_stack_pos)
	FuncExit(thr);
	ThreadSignalContext *sctx = SigCtx(thr);
	if (sctx) {
	sctx->int_signal_send = buf->int_signal_send;
	atomic_store(&sctx->in_blocking_func, buf->in_blocking_func,
	memory_order_relaxed);
	}
	atomic_store(&thr->in_signal_handler, buf->in_signal_handler,
	memory_order_relaxed);
	JmpBufGarbageCollect(thr, buf->sp - 1); // do not collect buf->sp
	return;
	}
	}
	Printf("ThreadSanitizer: can't find longjmp buf\n");
	CHECK(0);
	}

	// FIXME: put everything below into a common extern "C" block?
	extern "C" void __tsan_setjmp(uptr sp) {
	cur_thread_init();
	SetJmp(cur_thread(), sp);
	}

	#if SANITIZER_MAC
	TSAN_INTERCEPTOR(int, setjmp, void *env);
	TSAN_INTERCEPTOR(int, _setjmp, void *env);
	TSAN_INTERCEPTOR(int, sigsetjmp, void *env);
	#else // SANITIZER_MAC

	#if SANITIZER_NETBSD
	#define setjmp_symname __setjmp14
	#define sigsetjmp_symname __sigsetjmp14
	#else
	#define setjmp_symname setjmp
	#define sigsetjmp_symname sigsetjmp
	#endif

	#define TSAN_INTERCEPTOR_SETJMP_(x) __interceptor_ ## x
	#define TSAN_INTERCEPTOR_SETJMP__(x) TSAN_INTERCEPTOR_SETJMP_(x)
	#define TSAN_INTERCEPTOR_SETJMP TSAN_INTERCEPTOR_SETJMP__(setjmp_symname)
	#define TSAN_INTERCEPTOR_SIGSETJMP TSAN_INTERCEPTOR_SETJMP__(sigsetjmp_symname)

	#define TSAN_STRING_SETJMP SANITIZER_STRINGIFY(setjmp_symname)
	#define TSAN_STRING_SIGSETJMP SANITIZER_STRINGIFY(sigsetjmp_symname)

	// Not called. Merely to satisfy TSAN_INTERCEPT().
	extern "C" SANITIZER_INTERFACE_ATTRIBUTE
	int TSAN_INTERCEPTOR_SETJMP(void *env);
	extern "C" int TSAN_INTERCEPTOR_SETJMP(void *env) {
	CHECK(0);
	return 0;
	}

	// FIXME: any reason to have a separate declaration?
	extern "C" SANITIZER_INTERFACE_ATTRIBUTE
	int __interceptor__setjmp(void *env);
	extern "C" int __interceptor__setjmp(void *env) {
	CHECK(0);
	return 0;
	}

	extern "C" SANITIZER_INTERFACE_ATTRIBUTE
	int TSAN_INTERCEPTOR_SIGSETJMP(void *env);
	extern "C" int TSAN_INTERCEPTOR_SIGSETJMP(void *env) {
	CHECK(0);
	return 0;
	}

	#if !SANITIZER_NETBSD
	extern "C" SANITIZER_INTERFACE_ATTRIBUTE
	int __interceptor___sigsetjmp(void *env);
	extern "C" int __interceptor___sigsetjmp(void *env) {
	CHECK(0);
	return 0;
	}
	#endif

	extern "C" int setjmp_symname(void *env);
	extern "C" int _setjmp(void *env);
	extern "C" int sigsetjmp_symname(void *env);
	#if !SANITIZER_NETBSD
	extern "C" int __sigsetjmp(void *env);
	#endif
	DEFINE_REAL(int, setjmp_symname, void *env)
	DEFINE_REAL(int, _setjmp, void *env)
	DEFINE_REAL(int, sigsetjmp_symname, void *env)
	#if !SANITIZER_NETBSD
	DEFINE_REAL(int, __sigsetjmp, void *env)
	#endif
	#endif // SANITIZER_MAC

	#if SANITIZER_NETBSD
	#define longjmp_symname __longjmp14
	#define siglongjmp_symname __siglongjmp14
	#else
	#define longjmp_symname longjmp
	#define siglongjmp_symname siglongjmp
	#endif

	TSAN_INTERCEPTOR(void, longjmp_symname, uptr *env, int val) {
	// Note: if we call REAL(longjmp) in the context of ScopedInterceptor,
	// bad things will happen. We will jump over ScopedInterceptor dtor and can
	// leave thr->in_ignored_lib set.
	{
	SCOPED_INTERCEPTOR_RAW(longjmp_symname, env, val);
	}
	LongJmp(cur_thread(), env);
	REAL(longjmp_symname)(env, val);
	}

	TSAN_INTERCEPTOR(void, siglongjmp_symname, uptr *env, int val) {
	{
	SCOPED_INTERCEPTOR_RAW(siglongjmp_symname, env, val);
	}
	LongJmp(cur_thread(), env);
	REAL(siglongjmp_symname)(env, val);
	}

	#if SANITIZER_NETBSD
	TSAN_INTERCEPTOR(void, _longjmp, uptr *env, int val) {
	{
	SCOPED_INTERCEPTOR_RAW(_longjmp, env, val);
	}
	LongJmp(cur_thread(), env);
	REAL(_longjmp)(env, val);
	}
	#endif

	#if !SANITIZER_MAC
	TSAN_INTERCEPTOR(void*, malloc, uptr size) {
	if (in_symbolizer())
	return InternalAlloc(size);
	void *p = 0;
	{
	SCOPED_INTERCEPTOR_RAW(malloc, size);
	p = user_alloc(thr, pc, size);
	}
	invoke_malloc_hook(p, size);
	return p;
	}

	TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
	SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
	return user_memalign(thr, pc, align, sz);
	}

	TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
	if (in_symbolizer())
	return InternalCalloc(size, n);
	void *p = 0;
	{
	SCOPED_INTERCEPTOR_RAW(calloc, size, n);
	p = user_calloc(thr, pc, size, n);
	}
	invoke_malloc_hook(p, n * size);
	return p;
	}

	TSAN_INTERCEPTOR(void, realloc, void p, uptr size) {
	if (in_symbolizer())
	return InternalRealloc(p, size);
	if (p)
	invoke_free_hook(p);
	{
	SCOPED_INTERCEPTOR_RAW(realloc, p, size);
	p = user_realloc(thr, pc, p, size);
	}
	invoke_malloc_hook(p, size);
	return p;
	}

	TSAN_INTERCEPTOR(void, reallocarray, void p, uptr size, uptr n) {
	if (in_symbolizer())
	return InternalReallocArray(p, size, n);
	if (p)
	invoke_free_hook(p);
	{
	SCOPED_INTERCEPTOR_RAW(reallocarray, p, size, n);
	p = user_reallocarray(thr, pc, p, size, n);
	}
	invoke_malloc_hook(p, size);
	return p;
	}

	TSAN_INTERCEPTOR(void, free, void *p) {
	if (p == 0)
	return;
	if (in_symbolizer())
	return InternalFree(p);
	invoke_free_hook(p);
	SCOPED_INTERCEPTOR_RAW(free, p);
	user_free(thr, pc, p);
	}

	TSAN_INTERCEPTOR(void, cfree, void *p) {
	if (p == 0)
	return;
	if (in_symbolizer())
	return InternalFree(p);
	invoke_free_hook(p);
	SCOPED_INTERCEPTOR_RAW(cfree, p);
	user_free(thr, pc, p);
	}

	TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
	SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
	return user_alloc_usable_size(p);
	}
	#endif

	TSAN_INTERCEPTOR(char , strcpy, char dst, const char *src) {
	SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);
	uptr srclen = internal_strlen(src);
	MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
	MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
	return REAL(strcpy)(dst, src);
	}

	TSAN_INTERCEPTOR(char, strncpy, char dst, char *src, uptr n) {
	SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
	uptr srclen = internal_strnlen(src, n);
	MemoryAccessRange(thr, pc, (uptr)dst, n, true);
	MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
	return REAL(strncpy)(dst, src, n);
	}

	TSAN_INTERCEPTOR(char, strdup, const char str) {
	SCOPED_TSAN_INTERCEPTOR(strdup, str);
	// strdup will call malloc, so no instrumentation is required here.
	return REAL(strdup)(str);
	}

	// Zero out addr if it points into shadow memory and was provided as a hint
	// only, i.e., MAP_FIXED is not set.
	static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
	if (*addr) {
	if (!IsAppMem((uptr)addr) \|\| !IsAppMem((uptr)addr + sz - 1)) {
	if (flags & MAP_FIXED) {
	errno = errno_EINVAL;
	return false;
	} else {
	*addr = 0;
	}
	}
	}
	return true;
	}

	template <class Mmap>
	static void mmap_interceptor(ThreadState thr, uptr pc, Mmap real_mmap,
	void *addr, SIZE_T sz, int prot, int flags,
	int fd, OFF64_T off) {
	if (!fix_mmap_addr(&addr, sz, flags)) return MAP_FAILED;
	void *res = real_mmap(addr, sz, prot, flags, fd, off);
	if (res != MAP_FAILED) {
	if (fd > 0) FdAccess(thr, pc, fd);
	MemoryRangeImitateWriteOrResetRange(thr, pc, (uptr)res, sz);
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
	SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
	UnmapShadow(thr, (uptr)addr, sz);
	int res = REAL(munmap)(addr, sz);
	return res;
	}

	#if SANITIZER_LINUX
	TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
	SCOPED_INTERCEPTOR_RAW(memalign, align, sz);
	return user_memalign(thr, pc, align, sz);
	}
	#define TSAN_MAYBE_INTERCEPT_MEMALIGN TSAN_INTERCEPT(memalign)
	#else
	#define TSAN_MAYBE_INTERCEPT_MEMALIGN
	#endif

	#if !SANITIZER_MAC
	TSAN_INTERCEPTOR(void*, aligned_alloc, uptr align, uptr sz) {
	if (in_symbolizer())
	return InternalAlloc(sz, nullptr, align);
	SCOPED_INTERCEPTOR_RAW(aligned_alloc, align, sz);
	return user_aligned_alloc(thr, pc, align, sz);
	}

	TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
	if (in_symbolizer())
	return InternalAlloc(sz, nullptr, GetPageSizeCached());
	SCOPED_INTERCEPTOR_RAW(valloc, sz);
	return user_valloc(thr, pc, sz);
	}
	#endif

	#if SANITIZER_LINUX
	TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
	if (in_symbolizer()) {
	uptr PageSize = GetPageSizeCached();
	sz = sz ? RoundUpTo(sz, PageSize) : PageSize;
	return InternalAlloc(sz, nullptr, PageSize);
	}
	SCOPED_INTERCEPTOR_RAW(pvalloc, sz);
	return user_pvalloc(thr, pc, sz);
	}
	#define TSAN_MAYBE_INTERCEPT_PVALLOC TSAN_INTERCEPT(pvalloc)
	#else
	#define TSAN_MAYBE_INTERCEPT_PVALLOC
	#endif

	#if !SANITIZER_MAC
	TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
	if (in_symbolizer()) {
	void *p = InternalAlloc(sz, nullptr, align);
	if (!p)
	return errno_ENOMEM;
	*memptr = p;
	return 0;
	}
	SCOPED_INTERCEPTOR_RAW(posix_memalign, memptr, align, sz);
	return user_posix_memalign(thr, pc, memptr, align, sz);
	}
	#endif

	// __cxa_guard_acquire and friends need to be intercepted in a special way -
	// regular interceptors will break statically-linked libstdc++. Linux
	// interceptors are especially defined as weak functions (so that they don't
	// cause link errors when user defines them as well). So they silently
	// auto-disable themselves when such symbol is already present in the binary. If
	// we link libstdc++ statically, it will bring own __cxa_guard_acquire which
	// will silently replace our interceptor. That's why on Linux we simply export
	// these interceptors with INTERFACE_ATTRIBUTE.
	// On OS X, we don't support statically linking, so we just use a regular
	// interceptor.
	#if SANITIZER_MAC
	#define STDCXX_INTERCEPTOR TSAN_INTERCEPTOR
	#else
	#define STDCXX_INTERCEPTOR(rettype, name, ...) \
	extern "C" rettype INTERFACE_ATTRIBUTE name(__VA_ARGS__)
	#endif

	// Used in thread-safe function static initialization.
	STDCXX_INTERCEPTOR(int, __cxa_guard_acquire, atomic_uint32_t *g) {
	SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
	OnPotentiallyBlockingRegionBegin();
	auto on_exit = at_scope_exit(&OnPotentiallyBlockingRegionEnd);
	for (;;) {
	u32 cmp = atomic_load(g, memory_order_acquire);
	if (cmp == 0) {
	if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
	return 1;
	} else if (cmp == 1) {
	Acquire(thr, pc, (uptr)g);
	return 0;
	} else {
	internal_sched_yield();
	}
	}
	}

	STDCXX_INTERCEPTOR(void, __cxa_guard_release, atomic_uint32_t *g) {
	SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
	Release(thr, pc, (uptr)g);
	atomic_store(g, 1, memory_order_release);
	}

	STDCXX_INTERCEPTOR(void, __cxa_guard_abort, atomic_uint32_t *g) {
	SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
	atomic_store(g, 0, memory_order_relaxed);
	}

	namespace __tsan {
	void DestroyThreadState() {
	ThreadState *thr = cur_thread();
	Processor *proc = thr->proc();
	ThreadFinish(thr);
	ProcUnwire(proc, thr);
	ProcDestroy(proc);
	ThreadSignalContext *sctx = thr->signal_ctx;
	if (sctx) {
	thr->signal_ctx = 0;
	UnmapOrDie(sctx, sizeof(*sctx));
	}
	DTLS_Destroy();
	cur_thread_finalize();
	}
	} // namespace __tsan

	#if !SANITIZER_MAC && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
	static void thread_finalize(void *v) {
	uptr iter = (uptr)v;
	if (iter > 1) {
	if (pthread_setspecific(interceptor_ctx()->finalize_key,
	(void*)(iter - 1))) {
	Printf("ThreadSanitizer: failed to set thread key\n");
	Die();
	}
	return;
	}
	DestroyThreadState();
	}
	#endif


	struct ThreadParam {
	void* (callback)(void arg);
	void *param;
	atomic_uintptr_t tid;
	};

	extern "C" void __tsan_thread_start_func(void arg) {
	ThreadParam p = (ThreadParam)arg;
	void* (callback)(void arg) = p->callback;
	void *param = p->param;
	int tid = 0;
	{
	cur_thread_init();
	ThreadState *thr = cur_thread();
	// Thread-local state is not initialized yet.
	ScopedIgnoreInterceptors ignore;
	#if !SANITIZER_MAC && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
	ThreadIgnoreBegin(thr, 0);
	if (pthread_setspecific(interceptor_ctx()->finalize_key,
	(void *)GetPthreadDestructorIterations())) {
	Printf("ThreadSanitizer: failed to set thread key\n");
	Die();
	}
	ThreadIgnoreEnd(thr, 0);
	#endif
	while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
	internal_sched_yield();
	Processor *proc = ProcCreate();
	ProcWire(proc, thr);
	ThreadStart(thr, tid, GetTid(), ThreadType::Regular);
	atomic_store(&p->tid, 0, memory_order_release);
	}
	void *res = callback(param);
	// Prevent the callback from being tail called,
	// it mixes up stack traces.
	volatile int foo = 42;
	foo++;
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_create,
	void th, void attr, void (callback)(void), void param) {
	SCOPED_INTERCEPTOR_RAW(pthread_create, th, attr, callback, param);

	MaybeSpawnBackgroundThread();

	if (ctx->after_multithreaded_fork) {
	if (flags()->die_after_fork) {
	Report("ThreadSanitizer: starting new threads after multi-threaded "
	"fork is not supported. Dying (set die_after_fork=0 to override)\n");
	Die();
	} else {
	VPrintf(1, "ThreadSanitizer: starting new threads after multi-threaded "
	"fork is not supported (pid %d). Continuing because of "
	"die_after_fork=0, but you are on your own\n", internal_getpid());
	}
	}
	__sanitizer_pthread_attr_t myattr;
	if (attr == 0) {
	pthread_attr_init(&myattr);
	attr = &myattr;
	}
	int detached = 0;
	REAL(pthread_attr_getdetachstate)(attr, &detached);
	AdjustStackSize(attr);

	ThreadParam p;
	p.callback = callback;
	p.param = param;
	atomic_store(&p.tid, 0, memory_order_relaxed);
	int res = -1;
	{
	// Otherwise we see false positives in pthread stack manipulation.
	ScopedIgnoreInterceptors ignore;
	ThreadIgnoreBegin(thr, pc);
	res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
	ThreadIgnoreEnd(thr, pc);
	}
	if (res == 0) {
	int tid = ThreadCreate(thr, pc, (uptr)th, IsStateDetached(detached));
	CHECK_NE(tid, 0);
	// Synchronization on p.tid serves two purposes:
	// 1. ThreadCreate must finish before the new thread starts.
	// Otherwise the new thread can call pthread_detach, but the pthread_t
	// identifier is not yet registered in ThreadRegistry by ThreadCreate.
	// 2. ThreadStart must finish before this thread continues.
	// Otherwise, this thread can call pthread_detach and reset thr->sync
	// before the new thread got a chance to acquire from it in ThreadStart.
	atomic_store(&p.tid, tid, memory_order_release);
	while (atomic_load(&p.tid, memory_order_acquire) != 0)
	internal_sched_yield();
	}
	if (attr == &myattr)
	pthread_attr_destroy(&myattr);
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_join, void th, void *ret) {
	SCOPED_INTERCEPTOR_RAW(pthread_join, th, ret);
	int tid = ThreadTid(thr, pc, (uptr)th);
	ThreadIgnoreBegin(thr, pc);
	int res = BLOCK_REAL(pthread_join)(th, ret);
	ThreadIgnoreEnd(thr, pc);
	if (res == 0) {
	ThreadJoin(thr, pc, tid);
	}
	return res;
	}

	DEFINE_REAL_PTHREAD_FUNCTIONS

	TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
	SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
	int tid = ThreadTid(thr, pc, (uptr)th);
	int res = REAL(pthread_detach)(th);
	if (res == 0) {
	ThreadDetach(thr, pc, tid);
	}
	return res;
	}

	TSAN_INTERCEPTOR(void, pthread_exit, void *retval) {
	{
	SCOPED_INTERCEPTOR_RAW(pthread_exit, retval);
	#if !SANITIZER_MAC && !SANITIZER_ANDROID
	CHECK_EQ(thr, &cur_thread_placeholder);
	#endif
	}
	REAL(pthread_exit)(retval);
	}

	#if SANITIZER_LINUX
	TSAN_INTERCEPTOR(int, pthread_tryjoin_np, void th, void *ret) {
	SCOPED_TSAN_INTERCEPTOR(pthread_tryjoin_np, th, ret);
	int tid = ThreadTid(thr, pc, (uptr)th);
	ThreadIgnoreBegin(thr, pc);
	int res = REAL(pthread_tryjoin_np)(th, ret);
	ThreadIgnoreEnd(thr, pc);
	if (res == 0)
	ThreadJoin(thr, pc, tid);
	else
	ThreadNotJoined(thr, pc, tid, (uptr)th);
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_timedjoin_np, void th, void *ret,
	const struct timespec *abstime) {
	SCOPED_TSAN_INTERCEPTOR(pthread_timedjoin_np, th, ret, abstime);
	int tid = ThreadTid(thr, pc, (uptr)th);
	ThreadIgnoreBegin(thr, pc);
	int res = BLOCK_REAL(pthread_timedjoin_np)(th, ret, abstime);
	ThreadIgnoreEnd(thr, pc);
	if (res == 0)
	ThreadJoin(thr, pc, tid);
	else
	ThreadNotJoined(thr, pc, tid, (uptr)th);
	return res;
	}
	#endif

	// Problem:
	// NPTL implementation of pthread_cond has 2 versions (2.2.5 and 2.3.2).
	// pthread_cond_t has different size in the different versions.
	// If call new REAL functions for old pthread_cond_t, they will corrupt memory
	// after pthread_cond_t (old cond is smaller).
	// If we call old REAL functions for new pthread_cond_t, we will lose some
	// functionality (e.g. old functions do not support waiting against
	// CLOCK_REALTIME).
	// Proper handling would require to have 2 versions of interceptors as well.
	// But this is messy, in particular requires linker scripts when sanitizer
	// runtime is linked into a shared library.
	// Instead we assume we don't have dynamic libraries built against old
	// pthread (2.2.5 is dated by 2002). And provide legacy_pthread_cond flag
	// that allows to work with old libraries (but this mode does not support
	// some features, e.g. pthread_condattr_getpshared).
	static void init_cond(void c, bool force = false) {
	// sizeof(pthread_cond_t) >= sizeof(uptr) in both versions.
	// So we allocate additional memory on the side large enough to hold
	// any pthread_cond_t object. Always call new REAL functions, but pass
	// the aux object to them.
	// Note: the code assumes that PTHREAD_COND_INITIALIZER initializes
	// first word of pthread_cond_t to zero.
	// It's all relevant only for linux.
	if (!common_flags()->legacy_pthread_cond)
	return c;
	atomic_uintptr_t p = (atomic_uintptr_t)c;
	uptr cond = atomic_load(p, memory_order_acquire);
	if (!force && cond != 0)
	return (void*)cond;
	void *newcond = WRAP(malloc)(pthread_cond_t_sz);
	internal_memset(newcond, 0, pthread_cond_t_sz);
	if (atomic_compare_exchange_strong(p, &cond, (uptr)newcond,
	memory_order_acq_rel))
	return newcond;
	WRAP(free)(newcond);
	return (void*)cond;
	}

	struct CondMutexUnlockCtx {
	ScopedInterceptor *si;
	ThreadState *thr;
	uptr pc;
	void *m;
	};

	static void cond_mutex_unlock(CondMutexUnlockCtx *arg) {
	// pthread_cond_wait interceptor has enabled async signal delivery
	// (see BlockingCall below). Disable async signals since we are running
	// tsan code. Also ScopedInterceptor and BlockingCall destructors won't run
	// since the thread is cancelled, so we have to manually execute them
	// (the thread still can run some user code due to pthread_cleanup_push).
	ThreadSignalContext *ctx = SigCtx(arg->thr);
	CHECK_EQ(atomic_load(&ctx->in_blocking_func, memory_order_relaxed), 1);
	atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
	MutexPostLock(arg->thr, arg->pc, (uptr)arg->m, MutexFlagDoPreLockOnPostLock);
	// Undo BlockingCall ctor effects.
	arg->thr->ignore_interceptors--;
	arg->si->~ScopedInterceptor();
	}

	INTERCEPTOR(int, pthread_cond_init, void c, void a) {
	void *cond = init_cond(c, true);
	SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, cond, a);
	MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);
	return REAL(pthread_cond_init)(cond, a);
	}

	static int cond_wait(ThreadState thr, uptr pc, ScopedInterceptor si,
	int (fn)(void c, void m, void abstime), void *c,
	void m, void t) {
	MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
	MutexUnlock(thr, pc, (uptr)m);
	CondMutexUnlockCtx arg = {si, thr, pc, m};
	int res = 0;
	// This ensures that we handle mutex lock even in case of pthread_cancel.
	// See test/tsan/cond_cancel.cpp.
	{
	// Enable signal delivery while the thread is blocked.
	BlockingCall bc(thr);
	res = call_pthread_cancel_with_cleanup(
	fn, c, m, t, (void ()(void arg))cond_mutex_unlock, &arg);
	}
	if (res == errno_EOWNERDEAD) MutexRepair(thr, pc, (uptr)m);
	MutexPostLock(thr, pc, (uptr)m, MutexFlagDoPreLockOnPostLock);
	return res;
	}

	INTERCEPTOR(int, pthread_cond_wait, void c, void m) {
	void *cond = init_cond(c);
	SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, cond, m);
	return cond_wait(thr, pc, &si, (int ()(void c, void m, void abstime))REAL(
	pthread_cond_wait),
	cond, m, 0);
	}

	INTERCEPTOR(int, pthread_cond_timedwait, void c, void m, void *abstime) {
	void *cond = init_cond(c);
	SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, cond, m, abstime);
	return cond_wait(thr, pc, &si, REAL(pthread_cond_timedwait), cond, m,
	abstime);
	}

	#if SANITIZER_MAC
	INTERCEPTOR(int, pthread_cond_timedwait_relative_np, void c, void m,
	void *reltime) {
	void *cond = init_cond(c);
	SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait_relative_np, cond, m, reltime);
	return cond_wait(thr, pc, &si, REAL(pthread_cond_timedwait_relative_np), cond,
	m, reltime);
	}
	#endif

	INTERCEPTOR(int, pthread_cond_signal, void *c) {
	void *cond = init_cond(c);
	SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, cond);
	MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
	return REAL(pthread_cond_signal)(cond);
	}

	INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
	void *cond = init_cond(c);
	SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, cond);
	MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
	return REAL(pthread_cond_broadcast)(cond);
	}

	INTERCEPTOR(int, pthread_cond_destroy, void *c) {
	void *cond = init_cond(c);
	SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, cond);
	MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);
	int res = REAL(pthread_cond_destroy)(cond);
	if (common_flags()->legacy_pthread_cond) {
	// Free our aux cond and zero the pointer to not leave dangling pointers.
	WRAP(free)(cond);
	atomic_store((atomic_uintptr_t*)c, 0, memory_order_relaxed);
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_mutex_init, void m, void a) {
	SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
	int res = REAL(pthread_mutex_init)(m, a);
	if (res == 0) {
	u32 flagz = 0;
	if (a) {
	int type = 0;
	if (REAL(pthread_mutexattr_gettype)(a, &type) == 0)
	if (type == PTHREAD_MUTEX_RECURSIVE \|\|
	type == PTHREAD_MUTEX_RECURSIVE_NP)
	flagz \|= MutexFlagWriteReentrant;
	}
	MutexCreate(thr, pc, (uptr)m, flagz);
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
	SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
	int res = REAL(pthread_mutex_destroy)(m);
	if (res == 0 \|\| res == errno_EBUSY) {
	MutexDestroy(thr, pc, (uptr)m);
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
	SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
	int res = REAL(pthread_mutex_trylock)(m);
	if (res == errno_EOWNERDEAD)
	MutexRepair(thr, pc, (uptr)m);
	if (res == 0 \|\| res == errno_EOWNERDEAD)
	MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
	return res;
	}

	#if !SANITIZER_MAC
	TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void m, void abstime) {
	SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
	int res = REAL(pthread_mutex_timedlock)(m, abstime);
	if (res == 0) {
	MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
	}
	return res;
	}
	#endif

	#if !SANITIZER_MAC
	TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
	SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
	int res = REAL(pthread_spin_init)(m, pshared);
	if (res == 0) {
	MutexCreate(thr, pc, (uptr)m);
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
	SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
	int res = REAL(pthread_spin_destroy)(m);
	if (res == 0) {
	MutexDestroy(thr, pc, (uptr)m);
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
	SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
	MutexPreLock(thr, pc, (uptr)m);
	int res = REAL(pthread_spin_lock)(m);
	if (res == 0) {
	MutexPostLock(thr, pc, (uptr)m);
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
	SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
	int res = REAL(pthread_spin_trylock)(m);
	if (res == 0) {
	MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
	SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
	MutexUnlock(thr, pc, (uptr)m);
	int res = REAL(pthread_spin_unlock)(m);
	return res;
	}
	#endif

	TSAN_INTERCEPTOR(int, pthread_rwlock_init, void m, void a) {
	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
	int res = REAL(pthread_rwlock_init)(m, a);
	if (res == 0) {
	MutexCreate(thr, pc, (uptr)m);
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
	int res = REAL(pthread_rwlock_destroy)(m);
	if (res == 0) {
	MutexDestroy(thr, pc, (uptr)m);
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
	MutexPreReadLock(thr, pc, (uptr)m);
	int res = REAL(pthread_rwlock_rdlock)(m);
	if (res == 0) {
	MutexPostReadLock(thr, pc, (uptr)m);
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
	int res = REAL(pthread_rwlock_tryrdlock)(m);
	if (res == 0) {
	MutexPostReadLock(thr, pc, (uptr)m, MutexFlagTryLock);
	}
	return res;
	}

	#if !SANITIZER_MAC
	TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void m, void abstime) {
	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
	int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
	if (res == 0) {
	MutexPostReadLock(thr, pc, (uptr)m);
	}
	return res;
	}
	#endif

	TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
	MutexPreLock(thr, pc, (uptr)m);
	int res = REAL(pthread_rwlock_wrlock)(m);
	if (res == 0) {
	MutexPostLock(thr, pc, (uptr)m);
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
	int res = REAL(pthread_rwlock_trywrlock)(m);
	if (res == 0) {
	MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
	}
	return res;
	}

	#if !SANITIZER_MAC
	TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void m, void abstime) {
	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
	int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
	if (res == 0) {
	MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
	}
	return res;
	}
	#endif

	TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
	SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
	MutexReadOrWriteUnlock(thr, pc, (uptr)m);
	int res = REAL(pthread_rwlock_unlock)(m);
	return res;
	}

	#if !SANITIZER_MAC
	TSAN_INTERCEPTOR(int, pthread_barrier_init, void b, void a, unsigned count) {
	SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
	MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
	int res = REAL(pthread_barrier_init)(b, a, count);
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
	SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
	MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
	int res = REAL(pthread_barrier_destroy)(b);
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
	SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
	Release(thr, pc, (uptr)b);
	MemoryRead(thr, pc, (uptr)b, kSizeLog1);
	int res = REAL(pthread_barrier_wait)(b);
	MemoryRead(thr, pc, (uptr)b, kSizeLog1);
	if (res == 0 \|\| res == PTHREAD_BARRIER_SERIAL_THREAD) {
	Acquire(thr, pc, (uptr)b);
	}
	return res;
	}
	#endif

	TSAN_INTERCEPTOR(int, pthread_once, void o, void (f)()) {
	SCOPED_INTERCEPTOR_RAW(pthread_once, o, f);
	if (o == 0 \|\| f == 0)
	return errno_EINVAL;
	atomic_uint32_t *a;

	if (SANITIZER_MAC)
	a = static_cast<atomic_uint32_t>((void )((char *)o + sizeof(long_t)));
	else if (SANITIZER_NETBSD)
	a = static_cast<atomic_uint32_t*>
	((void )((char )o + __sanitizer::pthread_mutex_t_sz));
	else
	a = static_cast<atomic_uint32_t*>(o);

	u32 v = atomic_load(a, memory_order_acquire);
	if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
	memory_order_relaxed)) {
	(*f)();
	if (!thr->in_ignored_lib)
	Release(thr, pc, (uptr)o);
	atomic_store(a, 2, memory_order_release);
	} else {
	while (v != 2) {
	internal_sched_yield();
	v = atomic_load(a, memory_order_acquire);
	}
	if (!thr->in_ignored_lib)
	Acquire(thr, pc, (uptr)o);
	}
	return 0;
	}

	#if SANITIZER_LINUX && !SANITIZER_ANDROID
	TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
	SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
	if (fd > 0)
	FdAccess(thr, pc, fd);
	return REAL(__fxstat)(version, fd, buf);
	}
	#define TSAN_MAYBE_INTERCEPT___FXSTAT TSAN_INTERCEPT(__fxstat)
	#else
	#define TSAN_MAYBE_INTERCEPT___FXSTAT
	#endif

	TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
	#if SANITIZER_FREEBSD \|\| SANITIZER_MAC \|\| SANITIZER_ANDROID \|\| SANITIZER_NETBSD
	SCOPED_TSAN_INTERCEPTOR(fstat, fd, buf);
	if (fd > 0)
	FdAccess(thr, pc, fd);
	return REAL(fstat)(fd, buf);
	#else
	SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
	if (fd > 0)
	FdAccess(thr, pc, fd);
	return REAL(__fxstat)(0, fd, buf);
	#endif
	}

	#if SANITIZER_LINUX && !SANITIZER_ANDROID
	TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
	SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
	if (fd > 0)
	FdAccess(thr, pc, fd);
	return REAL(__fxstat64)(version, fd, buf);
	}
	#define TSAN_MAYBE_INTERCEPT___FXSTAT64 TSAN_INTERCEPT(__fxstat64)
	#else
	#define TSAN_MAYBE_INTERCEPT___FXSTAT64
	#endif

	#if SANITIZER_LINUX && !SANITIZER_ANDROID
	TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
	SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
	if (fd > 0)
	FdAccess(thr, pc, fd);
	return REAL(__fxstat64)(0, fd, buf);
	}
	#define TSAN_MAYBE_INTERCEPT_FSTAT64 TSAN_INTERCEPT(fstat64)
	#else
	#define TSAN_MAYBE_INTERCEPT_FSTAT64
	#endif

	TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
	SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
	READ_STRING(thr, pc, name, 0);
	int fd = REAL(open)(name, flags, mode);
	if (fd >= 0)
	FdFileCreate(thr, pc, fd);
	return fd;
	}

	#if SANITIZER_LINUX
	TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
	SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
	READ_STRING(thr, pc, name, 0);
	int fd = REAL(open64)(name, flags, mode);
	if (fd >= 0)
	FdFileCreate(thr, pc, fd);
	return fd;
	}
	#define TSAN_MAYBE_INTERCEPT_OPEN64 TSAN_INTERCEPT(open64)
	#else
	#define TSAN_MAYBE_INTERCEPT_OPEN64
	#endif

	TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
	SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
	READ_STRING(thr, pc, name, 0);
	int fd = REAL(creat)(name, mode);
	if (fd >= 0)
	FdFileCreate(thr, pc, fd);
	return fd;
	}

	#if SANITIZER_LINUX
	TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
	SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
	READ_STRING(thr, pc, name, 0);
	int fd = REAL(creat64)(name, mode);
	if (fd >= 0)
	FdFileCreate(thr, pc, fd);
	return fd;
	}
	#define TSAN_MAYBE_INTERCEPT_CREAT64 TSAN_INTERCEPT(creat64)
	#else
	#define TSAN_MAYBE_INTERCEPT_CREAT64
	#endif

	TSAN_INTERCEPTOR(int, dup, int oldfd) {
	SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
	int newfd = REAL(dup)(oldfd);
	if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
	FdDup(thr, pc, oldfd, newfd, true);
	return newfd;
	}

	TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
	SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
	int newfd2 = REAL(dup2)(oldfd, newfd);
	if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
	FdDup(thr, pc, oldfd, newfd2, false);
	return newfd2;
	}

	#if !SANITIZER_MAC
	TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
	SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
	int newfd2 = REAL(dup3)(oldfd, newfd, flags);
	if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
	FdDup(thr, pc, oldfd, newfd2, false);
	return newfd2;
	}
	#endif

	#if SANITIZER_LINUX
	TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
	SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
	int fd = REAL(eventfd)(initval, flags);
	if (fd >= 0)
	FdEventCreate(thr, pc, fd);
	return fd;
	}
	#define TSAN_MAYBE_INTERCEPT_EVENTFD TSAN_INTERCEPT(eventfd)
	#else
	#define TSAN_MAYBE_INTERCEPT_EVENTFD
	#endif

	#if SANITIZER_LINUX
	TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
	SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
	if (fd >= 0)
	FdClose(thr, pc, fd);
	fd = REAL(signalfd)(fd, mask, flags);
	if (fd >= 0)
	FdSignalCreate(thr, pc, fd);
	return fd;
	}
	#define TSAN_MAYBE_INTERCEPT_SIGNALFD TSAN_INTERCEPT(signalfd)
	#else
	#define TSAN_MAYBE_INTERCEPT_SIGNALFD
	#endif

	#if SANITIZER_LINUX
	TSAN_INTERCEPTOR(int, inotify_init, int fake) {
	SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
	int fd = REAL(inotify_init)(fake);
	if (fd >= 0)
	FdInotifyCreate(thr, pc, fd);
	return fd;
	}
	#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT TSAN_INTERCEPT(inotify_init)
	#else
	#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT
	#endif

	#if SANITIZER_LINUX
	TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
	SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
	int fd = REAL(inotify_init1)(flags);
	if (fd >= 0)
	FdInotifyCreate(thr, pc, fd);
	return fd;
	}
	#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1 TSAN_INTERCEPT(inotify_init1)
	#else
	#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1
	#endif

	TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
	SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
	int fd = REAL(socket)(domain, type, protocol);
	if (fd >= 0)
	FdSocketCreate(thr, pc, fd);
	return fd;
	}

	TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
	SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
	int res = REAL(socketpair)(domain, type, protocol, fd);
	if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
	FdPipeCreate(thr, pc, fd[0], fd[1]);
	return res;
	}

	TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
	SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
	FdSocketConnecting(thr, pc, fd);
	int res = REAL(connect)(fd, addr, addrlen);
	if (res == 0 && fd >= 0)
	FdSocketConnect(thr, pc, fd);
	return res;
	}

	TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
	SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
	int res = REAL(bind)(fd, addr, addrlen);
	if (fd > 0 && res == 0)
	FdAccess(thr, pc, fd);
	return res;
	}

	TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
	SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
	int res = REAL(listen)(fd, backlog);
	if (fd > 0 && res == 0)
	FdAccess(thr, pc, fd);
	return res;
	}

	TSAN_INTERCEPTOR(int, close, int fd) {
	SCOPED_TSAN_INTERCEPTOR(close, fd);
	if (fd >= 0)
	FdClose(thr, pc, fd);
	return REAL(close)(fd);
	}

	#if SANITIZER_LINUX
	TSAN_INTERCEPTOR(int, __close, int fd) {
	SCOPED_TSAN_INTERCEPTOR(__close, fd);
	if (fd >= 0)
	FdClose(thr, pc, fd);
	return REAL(__close)(fd);
	}
	#define TSAN_MAYBE_INTERCEPT___CLOSE TSAN_INTERCEPT(__close)
	#else
	#define TSAN_MAYBE_INTERCEPT___CLOSE
	#endif

	// glibc guts
	#if SANITIZER_LINUX && !SANITIZER_ANDROID
	TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
	SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
	int fds[64];
	int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
	for (int i = 0; i < cnt; i++) {
	if (fds[i] > 0)
	FdClose(thr, pc, fds[i]);
	}
	REAL(__res_iclose)(state, free_addr);
	}
	#define TSAN_MAYBE_INTERCEPT___RES_ICLOSE TSAN_INTERCEPT(__res_iclose)
	#else
	#define TSAN_MAYBE_INTERCEPT___RES_ICLOSE
	#endif

	TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
	SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
	int res = REAL(pipe)(pipefd);
	if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
	FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
	return res;
	}

	#if !SANITIZER_MAC
	TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
	SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
	int res = REAL(pipe2)(pipefd, flags);
	if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
	FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
	return res;
	}
	#endif

	TSAN_INTERCEPTOR(int, unlink, char *path) {
	SCOPED_TSAN_INTERCEPTOR(unlink, path);
	Release(thr, pc, File2addr(path));
	int res = REAL(unlink)(path);
	return res;
	}

	TSAN_INTERCEPTOR(void*, tmpfile, int fake) {
	SCOPED_TSAN_INTERCEPTOR(tmpfile, fake);
	void *res = REAL(tmpfile)(fake);
	if (res) {
	int fd = fileno_unlocked(res);
	if (fd >= 0)
	FdFileCreate(thr, pc, fd);
	}
	return res;
	}

	#if SANITIZER_LINUX
	TSAN_INTERCEPTOR(void*, tmpfile64, int fake) {
	SCOPED_TSAN_INTERCEPTOR(tmpfile64, fake);
	void *res = REAL(tmpfile64)(fake);
	if (res) {
	int fd = fileno_unlocked(res);
	if (fd >= 0)
	FdFileCreate(thr, pc, fd);
	}
	return res;
	}
	#define TSAN_MAYBE_INTERCEPT_TMPFILE64 TSAN_INTERCEPT(tmpfile64)
	#else
	#define TSAN_MAYBE_INTERCEPT_TMPFILE64
	#endif

	static void FlushStreams() {
	// Flushing all the streams here may freeze the process if a child thread is
	// performing file stream operations at the same time.
	REAL(fflush)(stdout);
	REAL(fflush)(stderr);
	}

	TSAN_INTERCEPTOR(void, abort, int fake) {
	SCOPED_TSAN_INTERCEPTOR(abort, fake);
	FlushStreams();
	REAL(abort)(fake);
	}

	TSAN_INTERCEPTOR(int, rmdir, char *path) {
	SCOPED_TSAN_INTERCEPTOR(rmdir, path);
	Release(thr, pc, Dir2addr(path));
	int res = REAL(rmdir)(path);
	return res;
	}

	TSAN_INTERCEPTOR(int, closedir, void *dirp) {
	SCOPED_TSAN_INTERCEPTOR(closedir, dirp);
	if (dirp) {
	int fd = dirfd(dirp);
	FdClose(thr, pc, fd);
	}
	return REAL(closedir)(dirp);
	}

	#if SANITIZER_LINUX
	TSAN_INTERCEPTOR(int, epoll_create, int size) {
	SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
	int fd = REAL(epoll_create)(size);
	if (fd >= 0)
	FdPollCreate(thr, pc, fd);
	return fd;
	}

	TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
	SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
	int fd = REAL(epoll_create1)(flags);
	if (fd >= 0)
	FdPollCreate(thr, pc, fd);
	return fd;
	}

	TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
	SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
	if (epfd >= 0)
	FdAccess(thr, pc, epfd);
	if (epfd >= 0 && fd >= 0)
	FdAccess(thr, pc, fd);
	if (op == EPOLL_CTL_ADD && epfd >= 0)
	FdRelease(thr, pc, epfd);
	int res = REAL(epoll_ctl)(epfd, op, fd, ev);
	return res;
	}

	TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
	SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
	if (epfd >= 0)
	FdAccess(thr, pc, epfd);
	int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
	if (res > 0 && epfd >= 0)
	FdAcquire(thr, pc, epfd);
	return res;
	}

	TSAN_INTERCEPTOR(int, epoll_pwait, int epfd, void *ev, int cnt, int timeout,
	void *sigmask) {
	SCOPED_TSAN_INTERCEPTOR(epoll_pwait, epfd, ev, cnt, timeout, sigmask);
	if (epfd >= 0)
	FdAccess(thr, pc, epfd);
	int res = BLOCK_REAL(epoll_pwait)(epfd, ev, cnt, timeout, sigmask);
	if (res > 0 && epfd >= 0)
	FdAcquire(thr, pc, epfd);
	return res;
	}

	#define TSAN_MAYBE_INTERCEPT_EPOLL \
	TSAN_INTERCEPT(epoll_create); \
	TSAN_INTERCEPT(epoll_create1); \
	TSAN_INTERCEPT(epoll_ctl); \
	TSAN_INTERCEPT(epoll_wait); \
	TSAN_INTERCEPT(epoll_pwait)
	#else
	#define TSAN_MAYBE_INTERCEPT_EPOLL
	#endif

	// The following functions are intercepted merely to process pending signals.
	// If program blocks signal X, we must deliver the signal before the function
	// returns. Similarly, if program unblocks a signal (or returns from sigsuspend)
	// it's better to deliver the signal straight away.
	TSAN_INTERCEPTOR(int, sigsuspend, const __sanitizer_sigset_t *mask) {
	SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);
	return REAL(sigsuspend)(mask);
	}

	TSAN_INTERCEPTOR(int, sigblock, int mask) {
	SCOPED_TSAN_INTERCEPTOR(sigblock, mask);
	return REAL(sigblock)(mask);
	}

	TSAN_INTERCEPTOR(int, sigsetmask, int mask) {
	SCOPED_TSAN_INTERCEPTOR(sigsetmask, mask);
	return REAL(sigsetmask)(mask);
	}

	TSAN_INTERCEPTOR(int, pthread_sigmask, int how, const __sanitizer_sigset_t *set,
	__sanitizer_sigset_t *oldset) {
	SCOPED_TSAN_INTERCEPTOR(pthread_sigmask, how, set, oldset);
	return REAL(pthread_sigmask)(how, set, oldset);
	}

	namespace __tsan {

	static void CallUserSignalHandler(ThreadState *thr, bool sync, bool acquire,
	bool sigact, int sig,
	__sanitizer_siginfo info, void uctx) {
	__sanitizer_sigaction *sigactions = interceptor_ctx()->sigactions;
	if (acquire)
	Acquire(thr, 0, (uptr)&sigactions[sig]);
	// Signals are generally asynchronous, so if we receive a signals when
	// ignores are enabled we should disable ignores. This is critical for sync
	// and interceptors, because otherwise we can miss syncronization and report
	// false races.
	int ignore_reads_and_writes = thr->ignore_reads_and_writes;
	int ignore_interceptors = thr->ignore_interceptors;
	int ignore_sync = thr->ignore_sync;
	if (!ctx->after_multithreaded_fork) {
	thr->ignore_reads_and_writes = 0;
	thr->fast_state.ClearIgnoreBit();
	thr->ignore_interceptors = 0;
	thr->ignore_sync = 0;
	}
	// Ensure that the handler does not spoil errno.
	const int saved_errno = errno;
	errno = 99;
	// This code races with sigaction. Be careful to not read sa_sigaction twice.
	// Also need to remember pc for reporting before the call,
	// because the handler can reset it.
	volatile uptr pc =
	sigact ? (uptr)sigactions[sig].sigaction : (uptr)sigactions[sig].handler;
	if (pc != sig_dfl && pc != sig_ign) {
	if (sigact)
	((__sanitizer_sigactionhandler_ptr)pc)(sig, info, uctx);
	else
	((__sanitizer_sighandler_ptr)pc)(sig);
	}
	if (!ctx->after_multithreaded_fork) {
	thr->ignore_reads_and_writes = ignore_reads_and_writes;
	if (ignore_reads_and_writes)
	thr->fast_state.SetIgnoreBit();
	thr->ignore_interceptors = ignore_interceptors;
	thr->ignore_sync = ignore_sync;
	}
	// We do not detect errno spoiling for SIGTERM,
	// because some SIGTERM handlers do spoil errno but reraise SIGTERM,
	// tsan reports false positive in such case.
	// It's difficult to properly detect this situation (reraise),
	// because in async signal processing case (when handler is called directly
	// from rtl_generic_sighandler) we have not yet received the reraised
	// signal; and it looks too fragile to intercept all ways to reraise a signal.
	if (flags()->report_bugs && !sync && sig != SIGTERM && errno != 99) {
	VarSizeStackTrace stack;
	// StackTrace::GetNestInstructionPc(pc) is used because return address is
	// expected, OutputReport() will undo this.
	ObtainCurrentStack(thr, StackTrace::GetNextInstructionPc(pc), &stack);
	ThreadRegistryLock l(ctx->thread_registry);
	ScopedReport rep(ReportTypeErrnoInSignal);
	if (!IsFiredSuppression(ctx, ReportTypeErrnoInSignal, stack)) {
	rep.AddStack(stack, true);
	OutputReport(thr, rep);
	}
	}
	errno = saved_errno;
	}

	void ProcessPendingSignals(ThreadState *thr) {
	ThreadSignalContext *sctx = SigCtx(thr);
	if (sctx == 0 \|\|
	atomic_load(&sctx->have_pending_signals, memory_order_relaxed) == 0)
	return;
	atomic_store(&sctx->have_pending_signals, 0, memory_order_relaxed);
	atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);
	internal_sigfillset(&sctx->emptyset);
	int res = REAL(pthread_sigmask)(SIG_SETMASK, &sctx->emptyset, &sctx->oldset);
	CHECK_EQ(res, 0);
	for (int sig = 0; sig < kSigCount; sig++) {
	SignalDesc *signal = &sctx->pending_signals[sig];
	if (signal->armed) {
	signal->armed = false;
	CallUserSignalHandler(thr, false, true, signal->sigaction, sig,
	&signal->siginfo, &signal->ctx);
	}
	}
	res = REAL(pthread_sigmask)(SIG_SETMASK, &sctx->oldset, 0);
	CHECK_EQ(res, 0);
	atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);
	}

	} // namespace __tsan

	static bool is_sync_signal(ThreadSignalContext *sctx, int sig) {
	return sig == SIGSEGV \|\| sig == SIGBUS \|\| sig == SIGILL \|\|
	sig == SIGABRT \|\| sig == SIGFPE \|\| sig == SIGPIPE \|\| sig == SIGSYS \|\|
	// If we are sending signal to ourselves, we must process it now.
	(sctx && sig == sctx->int_signal_send);
	}

	void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
	__sanitizer_siginfo *info,
	void *ctx) {
	cur_thread_init();
	ThreadState *thr = cur_thread();
	ThreadSignalContext *sctx = SigCtx(thr);
	if (sig < 0 \|\| sig >= kSigCount) {
	VPrintf(1, "ThreadSanitizer: ignoring signal %d\n", sig);
	return;
	}
	// Don't mess with synchronous signals.
	const bool sync = is_sync_signal(sctx, sig);
	if (sync \|\|
	// If we are in blocking function, we can safely process it now
	// (but check if we are in a recursive interceptor,
	// i.e. pthread_join()->munmap()).
	(sctx && atomic_load(&sctx->in_blocking_func, memory_order_relaxed))) {
	atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);
	if (sctx && atomic_load(&sctx->in_blocking_func, memory_order_relaxed)) {
	atomic_store(&sctx->in_blocking_func, 0, memory_order_relaxed);
	CallUserSignalHandler(thr, sync, true, sigact, sig, info, ctx);
	atomic_store(&sctx->in_blocking_func, 1, memory_order_relaxed);
	} else {
	// Be very conservative with when we do acquire in this case.
	// It's unsafe to do acquire in async handlers, because ThreadState
	// can be in inconsistent state.
	// SIGSYS looks relatively safe -- it's synchronous and can actually
	// need some global state.
	bool acq = (sig == SIGSYS);
	CallUserSignalHandler(thr, sync, acq, sigact, sig, info, ctx);
	}
	atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);
	return;
	}

	if (sctx == 0)
	return;
	SignalDesc *signal = &sctx->pending_signals[sig];
	if (signal->armed == false) {
	signal->armed = true;
	signal->sigaction = sigact;
	if (info)
	internal_memcpy(&signal->siginfo, info, sizeof(*info));
	if (ctx)
	internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
	atomic_store(&sctx->have_pending_signals, 1, memory_order_relaxed);
	}
	}

	static void rtl_sighandler(int sig) {
	rtl_generic_sighandler(false, sig, 0, 0);
	}

	static void rtl_sigaction(int sig, __sanitizer_siginfo info, void ctx) {
	rtl_generic_sighandler(true, sig, info, ctx);
	}

	TSAN_INTERCEPTOR(int, raise, int sig) {
	SCOPED_TSAN_INTERCEPTOR(raise, sig);
	ThreadSignalContext *sctx = SigCtx(thr);
	CHECK_NE(sctx, 0);
	int prev = sctx->int_signal_send;
	sctx->int_signal_send = sig;
	int res = REAL(raise)(sig);
	CHECK_EQ(sctx->int_signal_send, sig);
	sctx->int_signal_send = prev;
	return res;
	}

	TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
	SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
	ThreadSignalContext *sctx = SigCtx(thr);
	CHECK_NE(sctx, 0);
	int prev = sctx->int_signal_send;
	if (pid == (int)internal_getpid()) {
	sctx->int_signal_send = sig;
	}
	int res = REAL(kill)(pid, sig);
	if (pid == (int)internal_getpid()) {
	CHECK_EQ(sctx->int_signal_send, sig);
	sctx->int_signal_send = prev;
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
	SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
	ThreadSignalContext *sctx = SigCtx(thr);
	CHECK_NE(sctx, 0);
	int prev = sctx->int_signal_send;
	if (tid == pthread_self()) {
	sctx->int_signal_send = sig;
	}
	int res = REAL(pthread_kill)(tid, sig);
	if (tid == pthread_self()) {
	CHECK_EQ(sctx->int_signal_send, sig);
	sctx->int_signal_send = prev;
	}
	return res;
	}

	TSAN_INTERCEPTOR(int, gettimeofday, void tv, void tz) {
	SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
	// It's intercepted merely to process pending signals.
	return REAL(gettimeofday)(tv, tz);
	}

	TSAN_INTERCEPTOR(int, getaddrinfo, void node, void service,
	void hints, void rv) {
	SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
	// We miss atomic synchronization in getaddrinfo,
	// and can report false race between malloc and free
	// inside of getaddrinfo. So ignore memory accesses.
	ThreadIgnoreBegin(thr, pc);
	int res = REAL(getaddrinfo)(node, service, hints, rv);
	ThreadIgnoreEnd(thr, pc);
	return res;
	}

	TSAN_INTERCEPTOR(int, fork, int fake) {
	if (in_symbolizer())
	return REAL(fork)(fake);
	SCOPED_INTERCEPTOR_RAW(fork, fake);
	ForkBefore(thr, pc);
	int pid;
	{
	// On OS X, REAL(fork) can call intercepted functions (OSSpinLockLock), and
	// we'll assert in CheckNoLocks() unless we ignore interceptors.
	ScopedIgnoreInterceptors ignore;
	pid = REAL(fork)(fake);
	}
	if (pid == 0) {
	// child
	ForkChildAfter(thr, pc);
	FdOnFork(thr, pc);
	} else if (pid > 0) {
	// parent
	ForkParentAfter(thr, pc);
	} else {
	// error
	ForkParentAfter(thr, pc);
	}
	return pid;
	}

	TSAN_INTERCEPTOR(int, vfork, int fake) {
	// Some programs (e.g. openjdk) call close for all file descriptors
	// in the child process. Under tsan it leads to false positives, because
	// address space is shared, so the parent process also thinks that
	// the descriptors are closed (while they are actually not).
	// This leads to false positives due to missed synchronization.
	// Strictly saying this is undefined behavior, because vfork child is not
	// allowed to call any functions other than exec/exit. But this is what
	// openjdk does, so we want to handle it.
	// We could disable interceptors in the child process. But it's not possible
	// to simply intercept and wrap vfork, because vfork child is not allowed
	// to return from the function that calls vfork, and that's exactly what
	// we would do. So this would require some assembly trickery as well.
	// Instead we simply turn vfork into fork.
	return WRAP(fork)(fake);
	}

	#if !SANITIZER_MAC && !SANITIZER_ANDROID
	typedef int (dl_iterate_phdr_cb_t)(__sanitizer_dl_phdr_info info, SIZE_T size,
	void *data);
	struct dl_iterate_phdr_data {
	ThreadState *thr;
	uptr pc;
	dl_iterate_phdr_cb_t cb;
	void *data;
	};

	static bool IsAppNotRodata(uptr addr) {
	return IsAppMem(addr) && (u64)MemToShadow(addr) != kShadowRodata;
	}

	static int dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
	void *data) {
	dl_iterate_phdr_data cbdata = (dl_iterate_phdr_data )data;
	// dlopen/dlclose allocate/free dynamic-linker-internal memory, which is later
	// accessible in dl_iterate_phdr callback. But we don't see synchronization
	// inside of dynamic linker, so we "unpoison" it here in order to not
	// produce false reports. Ignoring malloc/free in dlopen/dlclose is not enough
	// because some libc functions call __libc_dlopen.
	if (info && IsAppNotRodata((uptr)info->dlpi_name))
	MemoryResetRange(cbdata->thr, cbdata->pc, (uptr)info->dlpi_name,
	internal_strlen(info->dlpi_name));
	int res = cbdata->cb(info, size, cbdata->data);
	// Perform the check one more time in case info->dlpi_name was overwritten
	// by user callback.
	if (info && IsAppNotRodata((uptr)info->dlpi_name))
	MemoryResetRange(cbdata->thr, cbdata->pc, (uptr)info->dlpi_name,
	internal_strlen(info->dlpi_name));
	return res;
	}

	TSAN_INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb_t cb, void *data) {
	SCOPED_TSAN_INTERCEPTOR(dl_iterate_phdr, cb, data);
	dl_iterate_phdr_data cbdata;
	cbdata.thr = thr;
	cbdata.pc = pc;
	cbdata.cb = cb;
	cbdata.data = data;
	int res = REAL(dl_iterate_phdr)(dl_iterate_phdr_cb, &cbdata);
	return res;
	}
	#endif

	static int OnExit(ThreadState *thr) {
	int status = Finalize(thr);
	FlushStreams();
	return status;
	}

	struct TsanInterceptorContext {
	ThreadState *thr;
	const uptr caller_pc;
	const uptr pc;
	};

	#if !SANITIZER_MAC
	static void HandleRecvmsg(ThreadState *thr, uptr pc,
	__sanitizer_msghdr *msg) {
	int fds[64];
	int cnt = ExtractRecvmsgFDs(msg, fds, ARRAY_SIZE(fds));
	for (int i = 0; i < cnt; i++)
	FdEventCreate(thr, pc, fds[i]);
	}
	#endif

	#include "sanitizer_common/sanitizer_platform_interceptors.h"
	// Causes interceptor recursion (getaddrinfo() and fopen())
	#undef SANITIZER_INTERCEPT_GETADDRINFO
	// We define our own.
	#if SANITIZER_INTERCEPT_TLS_GET_ADDR
	#define NEED_TLS_GET_ADDR
	#endif
	#undef SANITIZER_INTERCEPT_TLS_GET_ADDR
	#undef SANITIZER_INTERCEPT_PTHREAD_SIGMASK

	#define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
	#define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
	INTERCEPT_FUNCTION_VER(name, ver)

	#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
	MemoryAccessRange(((TsanInterceptorContext *)ctx)->thr, \
	((TsanInterceptorContext *)ctx)->pc, (uptr)ptr, size, \
	true)

	#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
	MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr, \
	((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
	false)

	#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
	SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__); \
	TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
	ctx = (void *)&_ctx; \
	(void) ctx;

	#define COMMON_INTERCEPTOR_ENTER_NOIGNORE(ctx, func, ...) \
	SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
	TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
	ctx = (void *)&_ctx; \
	(void) ctx;

	#define COMMON_INTERCEPTOR_FILE_OPEN(ctx, file, path) \
	if (path) \
	Acquire(thr, pc, File2addr(path)); \
	if (file) { \
	int fd = fileno_unlocked(file); \
	if (fd >= 0) FdFileCreate(thr, pc, fd); \
	}

	#define COMMON_INTERCEPTOR_FILE_CLOSE(ctx, file) \
	if (file) { \
	int fd = fileno_unlocked(file); \
	if (fd >= 0) FdClose(thr, pc, fd); \
	}

	#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
	libignore()->OnLibraryLoaded(filename)

	#define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() \
	libignore()->OnLibraryUnloaded()

	#define COMMON_INTERCEPTOR_ACQUIRE(ctx, u) \
	Acquire(((TsanInterceptorContext *) ctx)->thr, pc, u)

	#define COMMON_INTERCEPTOR_RELEASE(ctx, u) \
	Release(((TsanInterceptorContext *) ctx)->thr, pc, u)

	#define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
	Acquire(((TsanInterceptorContext *) ctx)->thr, pc, Dir2addr(path))

	#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
	FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)

	#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
	FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)

	#define COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd) \
	FdAccess(((TsanInterceptorContext *) ctx)->thr, pc, fd)

	#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
	FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)

	#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
	ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)

	#define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
	__tsan::ctx->thread_registry->SetThreadNameByUserId(thread, name)

	#define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)

	#define COMMON_INTERCEPTOR_ON_EXIT(ctx) \
	OnExit(((TsanInterceptorContext *) ctx)->thr)

	#define COMMON_INTERCEPTOR_MUTEX_PRE_LOCK(ctx, m) \
	MutexPreLock(((TsanInterceptorContext *)ctx)->thr, \
	((TsanInterceptorContext *)ctx)->pc, (uptr)m)

	#define COMMON_INTERCEPTOR_MUTEX_POST_LOCK(ctx, m) \
	MutexPostLock(((TsanInterceptorContext *)ctx)->thr, \
	((TsanInterceptorContext *)ctx)->pc, (uptr)m)

	#define COMMON_INTERCEPTOR_MUTEX_UNLOCK(ctx, m) \
	MutexUnlock(((TsanInterceptorContext *)ctx)->thr, \
	((TsanInterceptorContext *)ctx)->pc, (uptr)m)

	#define COMMON_INTERCEPTOR_MUTEX_REPAIR(ctx, m) \
	MutexRepair(((TsanInterceptorContext *)ctx)->thr, \
	((TsanInterceptorContext *)ctx)->pc, (uptr)m)

	#define COMMON_INTERCEPTOR_MUTEX_INVALID(ctx, m) \
	MutexInvalidAccess(((TsanInterceptorContext *)ctx)->thr, \
	((TsanInterceptorContext *)ctx)->pc, (uptr)m)

	#define COMMON_INTERCEPTOR_MMAP_IMPL(ctx, mmap, addr, sz, prot, flags, fd, \
	off) \
	do { \
	return mmap_interceptor(thr, pc, REAL(mmap), addr, sz, prot, flags, fd, \
	off); \
	} while (false)

	#if !SANITIZER_MAC
	#define COMMON_INTERCEPTOR_HANDLE_RECVMSG(ctx, msg) \
	HandleRecvmsg(((TsanInterceptorContext *)ctx)->thr, \
	((TsanInterceptorContext *)ctx)->pc, msg)
	#endif

	#define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
	if (TsanThread *t = GetCurrentThread()) { \
	*begin = t->tls_begin(); \
	*end = t->tls_end(); \
	} else { \
	begin = end = 0; \
	}

	#define COMMON_INTERCEPTOR_USER_CALLBACK_START() \
	SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START()

	#define COMMON_INTERCEPTOR_USER_CALLBACK_END() \
	SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END()

	#include "sanitizer_common/sanitizer_common_interceptors.inc"

	static int sigaction_impl(int sig, const __sanitizer_sigaction *act,
	__sanitizer_sigaction *old);
	static __sanitizer_sighandler_ptr signal_impl(int sig,
	__sanitizer_sighandler_ptr h);

	#define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signo, act, oldact) \
	{ return sigaction_impl(signo, act, oldact); }

	#define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signo, handler) \
	{ return (uptr)signal_impl(signo, (__sanitizer_sighandler_ptr)handler); }

	#include "sanitizer_common/sanitizer_signal_interceptors.inc"

	int sigaction_impl(int sig, const __sanitizer_sigaction *act,
	__sanitizer_sigaction *old) {
	// Note: if we call REAL(sigaction) directly for any reason without proxying
	// the signal handler through rtl_sigaction, very bad things will happen.
	// The handler will run synchronously and corrupt tsan per-thread state.
	SCOPED_INTERCEPTOR_RAW(sigaction, sig, act, old);
	__sanitizer_sigaction *sigactions = interceptor_ctx()->sigactions;
	__sanitizer_sigaction old_stored;
	if (old) internal_memcpy(&old_stored, &sigactions[sig], sizeof(old_stored));
	__sanitizer_sigaction newact;
	if (act) {
	// Copy act into sigactions[sig].
	// Can't use struct copy, because compiler can emit call to memcpy.
	// Can't use internal_memcpy, because it copies byte-by-byte,
	// and signal handler reads the handler concurrently. It it can read
	// some bytes from old value and some bytes from new value.
	// Use volatile to prevent insertion of memcpy.
	sigactions[sig].handler =
	(volatile __sanitizer_sighandler_ptr const )&act->handler;
	sigactions[sig].sa_flags = (volatile int const )&act->sa_flags;
	internal_memcpy(&sigactions[sig].sa_mask, &act->sa_mask,
	sizeof(sigactions[sig].sa_mask));
	#if !SANITIZER_FREEBSD && !SANITIZER_MAC && !SANITIZER_NETBSD
	sigactions[sig].sa_restorer = act->sa_restorer;
	#endif
	internal_memcpy(&newact, act, sizeof(newact));
	internal_sigfillset(&newact.sa_mask);
	if ((uptr)act->handler != sig_ign && (uptr)act->handler != sig_dfl) {
	if (newact.sa_flags & SA_SIGINFO)
	newact.sigaction = rtl_sigaction;
	else
	newact.handler = rtl_sighandler;
	}
	ReleaseStore(thr, pc, (uptr)&sigactions[sig]);
	act = &newact;
	}
	int res = REAL(sigaction)(sig, act, old);
	if (res == 0 && old) {
	uptr cb = (uptr)old->sigaction;
	if (cb == (uptr)rtl_sigaction \|\| cb == (uptr)rtl_sighandler) {
	internal_memcpy(old, &old_stored, sizeof(*old));
	}
	}
	return res;
	}

	static __sanitizer_sighandler_ptr signal_impl(int sig,
	__sanitizer_sighandler_ptr h) {
	__sanitizer_sigaction act;
	act.handler = h;
	internal_memset(&act.sa_mask, -1, sizeof(act.sa_mask));
	act.sa_flags = 0;
	__sanitizer_sigaction old;
	int res = sigaction_symname(sig, &act, &old);
	if (res) return (__sanitizer_sighandler_ptr)sig_err;
	return old.handler;
	}

	#define TSAN_SYSCALL() \
	ThreadState *thr = cur_thread(); \
	if (thr->ignore_interceptors) \
	return; \
	ScopedSyscall scoped_syscall(thr) \
	/**/

	struct ScopedSyscall {
	ThreadState *thr;

	explicit ScopedSyscall(ThreadState *thr)
	: thr(thr) {
	Initialize(thr);
	}

	~ScopedSyscall() {
	ProcessPendingSignals(thr);
	}
	};

	#if !SANITIZER_FREEBSD && !SANITIZER_MAC
	static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
	TSAN_SYSCALL();
	MemoryAccessRange(thr, pc, p, s, write);
	}

	static void syscall_acquire(uptr pc, uptr addr) {
	TSAN_SYSCALL();
	Acquire(thr, pc, addr);
	DPrintf("syscall_acquire(%p)\n", addr);
	}

	static void syscall_release(uptr pc, uptr addr) {
	TSAN_SYSCALL();
	DPrintf("syscall_release(%p)\n", addr);
	Release(thr, pc, addr);
	}

	static void syscall_fd_close(uptr pc, int fd) {
	TSAN_SYSCALL();
	FdClose(thr, pc, fd);
	}

	static USED void syscall_fd_acquire(uptr pc, int fd) {
	TSAN_SYSCALL();
	FdAcquire(thr, pc, fd);
	DPrintf("syscall_fd_acquire(%p)\n", fd);
	}

	static USED void syscall_fd_release(uptr pc, int fd) {
	TSAN_SYSCALL();
	DPrintf("syscall_fd_release(%p)\n", fd);
	FdRelease(thr, pc, fd);
	}

	static void syscall_pre_fork(uptr pc) {
	TSAN_SYSCALL();
	ForkBefore(thr, pc);
	}

	static void syscall_post_fork(uptr pc, int pid) {
	TSAN_SYSCALL();
	if (pid == 0) {
	// child
	ForkChildAfter(thr, pc);
	FdOnFork(thr, pc);
	} else if (pid > 0) {
	// parent
	ForkParentAfter(thr, pc);
	} else {
	// error
	ForkParentAfter(thr, pc);
	}
	}
	#endif

	#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
	syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)

	#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
	syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)

	#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
	do { \
	(void)(p); \
	(void)(s); \
	} while (false)

	#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
	do { \
	(void)(p); \
	(void)(s); \
	} while (false)

	#define COMMON_SYSCALL_ACQUIRE(addr) \
	syscall_acquire(GET_CALLER_PC(), (uptr)(addr))

	#define COMMON_SYSCALL_RELEASE(addr) \
	syscall_release(GET_CALLER_PC(), (uptr)(addr))

	#define COMMON_SYSCALL_FD_CLOSE(fd) syscall_fd_close(GET_CALLER_PC(), fd)

	#define COMMON_SYSCALL_FD_ACQUIRE(fd) syscall_fd_acquire(GET_CALLER_PC(), fd)

	#define COMMON_SYSCALL_FD_RELEASE(fd) syscall_fd_release(GET_CALLER_PC(), fd)

	#define COMMON_SYSCALL_PRE_FORK() \
	syscall_pre_fork(GET_CALLER_PC())

	#define COMMON_SYSCALL_POST_FORK(res) \
	syscall_post_fork(GET_CALLER_PC(), res)

	#include "sanitizer_common/sanitizer_common_syscalls.inc"
	#include "sanitizer_common/sanitizer_syscalls_netbsd.inc"

	#ifdef NEED_TLS_GET_ADDR
	// Define own interceptor instead of sanitizer_common's for three reasons:
	// 1. It must not process pending signals.
	// Signal handlers may contain MOVDQA instruction (see below).
	// 2. It must be as simple as possible to not contain MOVDQA.
	// 3. Sanitizer_common version uses COMMON_INTERCEPTOR_INITIALIZE_RANGE which
	// is empty for tsan (meant only for msan).
	// Note: __tls_get_addr can be called with mis-aligned stack due to:
	// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
	// So the interceptor must work with mis-aligned stack, in particular, does not
	// execute MOVDQA with stack addresses.
	TSAN_INTERCEPTOR(void , __tls_get_addr, void arg) {
	void *res = REAL(__tls_get_addr)(arg);
	ThreadState *thr = cur_thread();
	if (!thr)
	return res;
	DTLS::DTV *dtv = DTLS_on_tls_get_addr(arg, res, thr->tls_addr,
	thr->tls_addr + thr->tls_size);
	if (!dtv)
	return res;
	// New DTLS block has been allocated.
	MemoryResetRange(thr, 0, dtv->beg, dtv->size);
	return res;
	}
	#endif

	#if SANITIZER_NETBSD
	TSAN_INTERCEPTOR(void, _lwp_exit) {
	SCOPED_TSAN_INTERCEPTOR(_lwp_exit);
	DestroyThreadState();
	REAL(_lwp_exit)();
	}
	#define TSAN_MAYBE_INTERCEPT__LWP_EXIT TSAN_INTERCEPT(_lwp_exit)
	#else
	#define TSAN_MAYBE_INTERCEPT__LWP_EXIT
	#endif

	#if SANITIZER_FREEBSD
	TSAN_INTERCEPTOR(void, thr_exit, tid_t *state) {
	SCOPED_TSAN_INTERCEPTOR(thr_exit, state);
	DestroyThreadState();
	REAL(thr_exit(state));
	}
	#define TSAN_MAYBE_INTERCEPT_THR_EXIT TSAN_INTERCEPT(thr_exit)
	#else
	#define TSAN_MAYBE_INTERCEPT_THR_EXIT
	#endif

	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_init, void c, void a)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_signal, void *c)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_broadcast, void *c)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_wait, void c, void m)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_destroy, void *c)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_init, void m, void a)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_destroy, void *m)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_trylock, void *m)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_init, void m, void a)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_destroy, void *m)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_rdlock, void *m)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_tryrdlock, void *m)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_wrlock, void *m)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_trywrlock, void *m)
	TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_unlock, void *m)
	TSAN_INTERCEPTOR_NETBSD_ALIAS_THR(int, once, void o, void (f)())
	TSAN_INTERCEPTOR_NETBSD_ALIAS_THR2(int, sigsetmask, sigmask, int a, void *b,
	void *c)

	namespace __tsan {

	static void finalize(void *arg) {
	ThreadState *thr = cur_thread();
	int status = Finalize(thr);
	// Make sure the output is not lost.
	FlushStreams();
	if (status)
	Die();
	}

	#if !SANITIZER_MAC && !SANITIZER_ANDROID
	static void unreachable() {
	Report("FATAL: ThreadSanitizer: unreachable called\n");
	Die();
	}
	#endif

	// Define default implementation since interception of libdispatch is optional.
	SANITIZER_WEAK_ATTRIBUTE void InitializeLibdispatchInterceptors() {}

	void InitializeInterceptors() {
	#if !SANITIZER_MAC
	// We need to setup it early, because functions like dlsym() can call it.
	REAL(memset) = internal_memset;
	REAL(memcpy) = internal_memcpy;
	#endif

	// Instruct libc malloc to consume less memory.
	#if SANITIZER_LINUX
	mallopt(1, 0); // M_MXFAST
	mallopt(-3, 32*1024); // M_MMAP_THRESHOLD
	#endif

	new(interceptor_ctx()) InterceptorContext();

	InitializeCommonInterceptors();
	InitializeSignalInterceptors();
	InitializeLibdispatchInterceptors();

	#if !SANITIZER_MAC
	// We can not use TSAN_INTERCEPT to get setjmp addr,
	// because it does &setjmp and setjmp is not present in some versions of libc.
	using __interception::InterceptFunction;
	InterceptFunction(TSAN_STRING_SETJMP, (uptr*)&REAL(setjmp_symname), 0, 0);
	InterceptFunction("_setjmp", (uptr*)&REAL(_setjmp), 0, 0);
	InterceptFunction(TSAN_STRING_SIGSETJMP, (uptr*)&REAL(sigsetjmp_symname), 0,
	0);
	#if !SANITIZER_NETBSD
	InterceptFunction("__sigsetjmp", (uptr*)&REAL(__sigsetjmp), 0, 0);
	#endif
	#endif

	TSAN_INTERCEPT(longjmp_symname);
	TSAN_INTERCEPT(siglongjmp_symname);
	#if SANITIZER_NETBSD
	TSAN_INTERCEPT(_longjmp);
	#endif

	TSAN_INTERCEPT(malloc);
	TSAN_INTERCEPT(__libc_memalign);
	TSAN_INTERCEPT(calloc);
	TSAN_INTERCEPT(realloc);
	TSAN_INTERCEPT(reallocarray);
	TSAN_INTERCEPT(free);
	TSAN_INTERCEPT(cfree);
	TSAN_INTERCEPT(munmap);
	TSAN_MAYBE_INTERCEPT_MEMALIGN;
	TSAN_INTERCEPT(valloc);
	TSAN_MAYBE_INTERCEPT_PVALLOC;
	TSAN_INTERCEPT(posix_memalign);

	TSAN_INTERCEPT(strcpy);
	TSAN_INTERCEPT(strncpy);
	TSAN_INTERCEPT(strdup);

	TSAN_INTERCEPT(pthread_create);
	TSAN_INTERCEPT(pthread_join);
	TSAN_INTERCEPT(pthread_detach);
	TSAN_INTERCEPT(pthread_exit);
	#if SANITIZER_LINUX
	TSAN_INTERCEPT(pthread_tryjoin_np);
	TSAN_INTERCEPT(pthread_timedjoin_np);
	#endif

	TSAN_INTERCEPT_VER(pthread_cond_init, PTHREAD_ABI_BASE);
	TSAN_INTERCEPT_VER(pthread_cond_signal, PTHREAD_ABI_BASE);
	TSAN_INTERCEPT_VER(pthread_cond_broadcast, PTHREAD_ABI_BASE);
	TSAN_INTERCEPT_VER(pthread_cond_wait, PTHREAD_ABI_BASE);
	TSAN_INTERCEPT_VER(pthread_cond_timedwait, PTHREAD_ABI_BASE);
	TSAN_INTERCEPT_VER(pthread_cond_destroy, PTHREAD_ABI_BASE);

	TSAN_INTERCEPT(pthread_mutex_init);
	TSAN_INTERCEPT(pthread_mutex_destroy);
	TSAN_INTERCEPT(pthread_mutex_trylock);
	TSAN_INTERCEPT(pthread_mutex_timedlock);

	TSAN_INTERCEPT(pthread_spin_init);
	TSAN_INTERCEPT(pthread_spin_destroy);
	TSAN_INTERCEPT(pthread_spin_lock);
	TSAN_INTERCEPT(pthread_spin_trylock);
	TSAN_INTERCEPT(pthread_spin_unlock);

	TSAN_INTERCEPT(pthread_rwlock_init);
	TSAN_INTERCEPT(pthread_rwlock_destroy);
	TSAN_INTERCEPT(pthread_rwlock_rdlock);
	TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
	TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
	TSAN_INTERCEPT(pthread_rwlock_wrlock);
	TSAN_INTERCEPT(pthread_rwlock_trywrlock);
	TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
	TSAN_INTERCEPT(pthread_rwlock_unlock);

	TSAN_INTERCEPT(pthread_barrier_init);
	TSAN_INTERCEPT(pthread_barrier_destroy);
	TSAN_INTERCEPT(pthread_barrier_wait);

	TSAN_INTERCEPT(pthread_once);

	TSAN_INTERCEPT(fstat);
	TSAN_MAYBE_INTERCEPT___FXSTAT;
	TSAN_MAYBE_INTERCEPT_FSTAT64;
	TSAN_MAYBE_INTERCEPT___FXSTAT64;
	TSAN_INTERCEPT(open);
	TSAN_MAYBE_INTERCEPT_OPEN64;
	TSAN_INTERCEPT(creat);
	TSAN_MAYBE_INTERCEPT_CREAT64;
	TSAN_INTERCEPT(dup);
	TSAN_INTERCEPT(dup2);
	TSAN_INTERCEPT(dup3);
	TSAN_MAYBE_INTERCEPT_EVENTFD;
	TSAN_MAYBE_INTERCEPT_SIGNALFD;
	TSAN_MAYBE_INTERCEPT_INOTIFY_INIT;
	TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1;
	TSAN_INTERCEPT(socket);
	TSAN_INTERCEPT(socketpair);
	TSAN_INTERCEPT(connect);
	TSAN_INTERCEPT(bind);
	TSAN_INTERCEPT(listen);
	TSAN_MAYBE_INTERCEPT_EPOLL;
	TSAN_INTERCEPT(close);
	TSAN_MAYBE_INTERCEPT___CLOSE;
	TSAN_MAYBE_INTERCEPT___RES_ICLOSE;
	TSAN_INTERCEPT(pipe);
	TSAN_INTERCEPT(pipe2);

	TSAN_INTERCEPT(unlink);
	TSAN_INTERCEPT(tmpfile);
	TSAN_MAYBE_INTERCEPT_TMPFILE64;
	TSAN_INTERCEPT(abort);
	TSAN_INTERCEPT(rmdir);
	TSAN_INTERCEPT(closedir);

	TSAN_INTERCEPT(sigsuspend);
	TSAN_INTERCEPT(sigblock);
	TSAN_INTERCEPT(sigsetmask);
	TSAN_INTERCEPT(pthread_sigmask);
	TSAN_INTERCEPT(raise);
	TSAN_INTERCEPT(kill);
	TSAN_INTERCEPT(pthread_kill);
	TSAN_INTERCEPT(sleep);
	TSAN_INTERCEPT(usleep);
	TSAN_INTERCEPT(nanosleep);
	TSAN_INTERCEPT(pause);
	TSAN_INTERCEPT(gettimeofday);
	TSAN_INTERCEPT(getaddrinfo);

	TSAN_INTERCEPT(fork);
	TSAN_INTERCEPT(vfork);
	#if !SANITIZER_ANDROID
	TSAN_INTERCEPT(dl_iterate_phdr);
	#endif
	TSAN_MAYBE_INTERCEPT_ON_EXIT;
	TSAN_INTERCEPT(__cxa_atexit);
	TSAN_INTERCEPT(_exit);

	#ifdef NEED_TLS_GET_ADDR
	TSAN_INTERCEPT(__tls_get_addr);
	#endif

	TSAN_MAYBE_INTERCEPT__LWP_EXIT;
	TSAN_MAYBE_INTERCEPT_THR_EXIT;

	#if !SANITIZER_MAC && !SANITIZER_ANDROID
	// Need to setup it, because interceptors check that the function is resolved.
	// But atexit is emitted directly into the module, so can't be resolved.
	REAL(atexit) = (int()(void()()))unreachable;
	#endif

	if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
	Printf("ThreadSanitizer: failed to setup atexit callback\n");
	Die();
	}

	#if !SANITIZER_MAC && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
	if (pthread_key_create(&interceptor_ctx()->finalize_key, &thread_finalize)) {
	Printf("ThreadSanitizer: failed to create thread key\n");
	Die();
	}
	#endif

	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_init);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_signal);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_broadcast);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_wait);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_destroy);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_init);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_destroy);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_trylock);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_init);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_destroy);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_rdlock);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_tryrdlock);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_wrlock);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_trywrlock);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_unlock);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(once);
	TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(sigsetmask);

	FdInit();
	}

	} // namespace __tsan

	// Invisible barrier for tests.
	// There were several unsuccessful iterations for this functionality:
	// 1. Initially it was implemented in user code using
	// REAL(pthread_barrier_wait). But pthread_barrier_wait is not supported on
	// MacOS. Futexes are linux-specific for this matter.
	// 2. Then we switched to atomics+usleep(10). But usleep produced parasitic
	// "as-if synchronized via sleep" messages in reports which failed some
	// output tests.
	// 3. Then we switched to atomics+sched_yield. But this produced tons of tsan-
	// visible events, which lead to "failed to restore stack trace" failures.
	// Note that no_sanitize_thread attribute does not turn off atomic interception
	// so attaching it to the function defined in user code does not help.
	// That's why we now have what we have.
	extern "C" SANITIZER_INTERFACE_ATTRIBUTE
	void __tsan_testonly_barrier_init(u64 *barrier, u32 count) {
	if (count >= (1 << 8)) {
	Printf("barrier_init: count is too large (%d)\n", count);
	Die();
	}
	// 8 lsb is thread count, the remaining are count of entered threads.
	*barrier = count;
	}

	extern "C" SANITIZER_INTERFACE_ATTRIBUTE
	void __tsan_testonly_barrier_wait(u64 *barrier) {
	unsigned old = __atomic_fetch_add(barrier, 1 << 8, __ATOMIC_RELAXED);
	unsigned old_epoch = (old >> 8) / (old & 0xff);
	for (;;) {
	unsigned cur = __atomic_load_n(barrier, __ATOMIC_RELAXED);
	unsigned cur_epoch = (cur >> 8) / (cur & 0xff);
	if (cur_epoch != old_epoch)
	return;
	internal_sched_yield();
	}
	}

compiler-rt/trunk/lib/tsan/rtl/tsan_interceptors_posix.cpp

				//===-- tsan_interceptors_posix.cpp ---------------------------------------===//
				//
				// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
				// See https://llvm.org/LICENSE.txt for license information.
				// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
				//
				//===----------------------------------------------------------------------===//
				//
				// This file is a part of ThreadSanitizer (TSan), a race detector.
				//
				// FIXME: move as many interceptors as possible into
				// sanitizer_common/sanitizer_common_interceptors.inc
				//===----------------------------------------------------------------------===//

				#include "sanitizer_common/sanitizer_atomic.h"
				#include "sanitizer_common/sanitizer_errno.h"
				#include "sanitizer_common/sanitizer_libc.h"
				#include "sanitizer_common/sanitizer_linux.h"
				#include "sanitizer_common/sanitizer_platform_limits_netbsd.h"
				#include "sanitizer_common/sanitizer_platform_limits_posix.h"
				#include "sanitizer_common/sanitizer_placement_new.h"
				#include "sanitizer_common/sanitizer_posix.h"
				#include "sanitizer_common/sanitizer_stacktrace.h"
				#include "sanitizer_common/sanitizer_tls_get_addr.h"
				#include "interception/interception.h"
				#include "tsan_interceptors.h"
				#include "tsan_interface.h"
				#include "tsan_platform.h"
				#include "tsan_suppressions.h"
				#include "tsan_rtl.h"
				#include "tsan_mman.h"
				#include "tsan_fd.h"

				using namespace __tsan;

				#if SANITIZER_FREEBSD \|\| SANITIZER_MAC
				#define stdout __stdoutp
				#define stderr __stderrp
				#endif

				#if SANITIZER_NETBSD
				#define dirfd(dirp) ((int )(dirp))
				#define fileno_unlocked(fp) \
				(((__sanitizer_FILE *)fp)->_file == -1 \
				? -1 \
				: (int)(unsigned short)(((__sanitizer_FILE *)fp)->_file))

				#define stdout ((__sanitizer_FILE*)&__sF[1])
				#define stderr ((__sanitizer_FILE*)&__sF[2])

				#define nanosleep __nanosleep50
				#define vfork __vfork14
				#endif

				#if SANITIZER_ANDROID
				#define mallopt(a, b)
				#endif

				#ifdef __mips__
				const int kSigCount = 129;
				#else
				const int kSigCount = 65;
				#endif

				#ifdef __mips__
				struct ucontext_t {
				u64 opaque[768 / sizeof(u64) + 1];
				};
				#else
				struct ucontext_t {
				// The size is determined by looking at sizeof of real ucontext_t on linux.
				u64 opaque[936 / sizeof(u64) + 1];
				};
				#endif

				#if defined(__x86_64__) \|\| defined(__mips__) \|\| SANITIZER_PPC64V1
				#define PTHREAD_ABI_BASE "GLIBC_2.3.2"
				#elif defined(__aarch64__) \|\| SANITIZER_PPC64V2
				#define PTHREAD_ABI_BASE "GLIBC_2.17"
				#endif

				extern "C" int pthread_attr_init(void *attr);
				extern "C" int pthread_attr_destroy(void *attr);
				DECLARE_REAL(int, pthread_attr_getdetachstate, void , void )
				extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
				extern "C" int pthread_key_create(unsigned key, void (destructor)(void* v));
				extern "C" int pthread_setspecific(unsigned key, const void *v);
				DECLARE_REAL(int, pthread_mutexattr_gettype, void , void )
				DECLARE_REAL(int, fflush, __sanitizer_FILE *fp)
				DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, uptr size)
				DECLARE_REAL_AND_INTERCEPTOR(void, free, void *ptr)
				extern "C" void *pthread_self();
				extern "C" void _exit(int status);
				#if !SANITIZER_NETBSD
				extern "C" int fileno_unlocked(void *stream);
				extern "C" int dirfd(void *dirp);
				#endif
				#if !SANITIZER_FREEBSD && !SANITIZER_ANDROID && !SANITIZER_NETBSD
				extern "C" int mallopt(int param, int value);
				#endif
				#if SANITIZER_NETBSD
				extern __sanitizer_FILE __sF[];
				#else
				extern __sanitizer_FILE stdout, stderr;
				#endif
				#if !SANITIZER_FREEBSD && !SANITIZER_MAC && !SANITIZER_NETBSD
				const int PTHREAD_MUTEX_RECURSIVE = 1;
				const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
				#else
				const int PTHREAD_MUTEX_RECURSIVE = 2;
				const int PTHREAD_MUTEX_RECURSIVE_NP = 2;
				#endif
				#if !SANITIZER_FREEBSD && !SANITIZER_MAC && !SANITIZER_NETBSD
				const int EPOLL_CTL_ADD = 1;
				#endif
				const int SIGILL = 4;
				const int SIGABRT = 6;
				const int SIGFPE = 8;
				const int SIGSEGV = 11;
				const int SIGPIPE = 13;
				const int SIGTERM = 15;
				#if defined(__mips__) \|\| SANITIZER_FREEBSD \|\| SANITIZER_MAC \|\| SANITIZER_NETBSD
				const int SIGBUS = 10;
				const int SIGSYS = 12;
				#else
				const int SIGBUS = 7;
				const int SIGSYS = 31;
				#endif
				void const MAP_FAILED = (void)-1;
				#if SANITIZER_NETBSD
				const int PTHREAD_BARRIER_SERIAL_THREAD = 1234567;
				#elif !SANITIZER_MAC
				const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
				#endif
				const int MAP_FIXED = 0x10;
				typedef long long_t;

				// From /usr/include/unistd.h
				# define F_ULOCK 0 /* Unlock a previously locked region. */
				# define F_LOCK 1 /* Lock a region for exclusive use. */
				# define F_TLOCK 2 /* Test and lock a region for exclusive use. */
				# define F_TEST 3 /* Test a region for other processes locks. */

				#if SANITIZER_FREEBSD \|\| SANITIZER_MAC \|\| SANITIZER_NETBSD
				const int SA_SIGINFO = 0x40;
				const int SIG_SETMASK = 3;
				#elif defined(__mips__)
				const int SA_SIGINFO = 8;
				const int SIG_SETMASK = 3;
				#else
				const int SA_SIGINFO = 4;
				const int SIG_SETMASK = 2;
				#endif

				#define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED \
				(cur_thread_init(), !cur_thread()->is_inited)

				namespace __tsan {
				struct SignalDesc {
				bool armed;
				bool sigaction;
				__sanitizer_siginfo siginfo;
				ucontext_t ctx;
				};

				struct ThreadSignalContext {
				int int_signal_send;
				atomic_uintptr_t in_blocking_func;
				atomic_uintptr_t have_pending_signals;
				SignalDesc pending_signals[kSigCount];
				// emptyset and oldset are too big for stack.
				__sanitizer_sigset_t emptyset;
				__sanitizer_sigset_t oldset;
				};

				// The sole reason tsan wraps atexit callbacks is to establish synchronization
				// between callback setup and callback execution.
				struct AtExitCtx {
				void (*f)();
				void *arg;
				};

				// InterceptorContext holds all global data required for interceptors.
				// It's explicitly constructed in InitializeInterceptors with placement new
				// and is never destroyed. This allows usage of members with non-trivial
				// constructors and destructors.
				struct InterceptorContext {
				// The object is 64-byte aligned, because we want hot data to be located
				// in a single cache line if possible (it's accessed in every interceptor).
				ALIGNED(64) LibIgnore libignore;
				__sanitizer_sigaction sigactions[kSigCount];
				#if !SANITIZER_MAC && !SANITIZER_NETBSD
				unsigned finalize_key;
				#endif

				BlockingMutex atexit_mu;
				Vector<struct AtExitCtx *> AtExitStack;

				InterceptorContext()
				: libignore(LINKER_INITIALIZED), AtExitStack() {
				}
				};

				static ALIGNED(64) char interceptor_placeholder[sizeof(InterceptorContext)];
				InterceptorContext *interceptor_ctx() {
				return reinterpret_cast<InterceptorContext*>(&interceptor_placeholder[0]);
				}

				LibIgnore *libignore() {
				return &interceptor_ctx()->libignore;
				}

				void InitializeLibIgnore() {
				const SuppressionContext &supp = *Suppressions();
				const uptr n = supp.SuppressionCount();
				for (uptr i = 0; i < n; i++) {
				const Suppression *s = supp.SuppressionAt(i);
				if (0 == internal_strcmp(s->type, kSuppressionLib))
				libignore()->AddIgnoredLibrary(s->templ);
				}
				if (flags()->ignore_noninstrumented_modules)
				libignore()->IgnoreNoninstrumentedModules(true);
				libignore()->OnLibraryLoaded(0);
				}

				// The following two hooks can be used by for cooperative scheduling when
				// locking.
				#ifdef TSAN_EXTERNAL_HOOKS
				void OnPotentiallyBlockingRegionBegin();
				void OnPotentiallyBlockingRegionEnd();
				#else
				SANITIZER_WEAK_CXX_DEFAULT_IMPL void OnPotentiallyBlockingRegionBegin() {}
				SANITIZER_WEAK_CXX_DEFAULT_IMPL void OnPotentiallyBlockingRegionEnd() {}
				#endif

				} // namespace __tsan

				static ThreadSignalContext SigCtx(ThreadState thr) {
				ThreadSignalContext ctx = (ThreadSignalContext)thr->signal_ctx;
				if (ctx == 0 && !thr->is_dead) {
				ctx = (ThreadSignalContext)MmapOrDie(sizeof(ctx), "ThreadSignalContext");
				MemoryResetRange(thr, (uptr)&SigCtx, (uptr)ctx, sizeof(*ctx));
				thr->signal_ctx = ctx;
				}
				return ctx;
				}

				ScopedInterceptor::ScopedInterceptor(ThreadState thr, const char fname,
				uptr pc)
				: thr_(thr), pc_(pc), in_ignored_lib_(false), ignoring_(false) {
				Initialize(thr);
				if (!thr_->is_inited) return;
				if (!thr_->ignore_interceptors) FuncEntry(thr, pc);
				DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
				ignoring_ =
				!thr_->in_ignored_lib && libignore()->IsIgnored(pc, &in_ignored_lib_);
				EnableIgnores();
				}

				ScopedInterceptor::~ScopedInterceptor() {
				if (!thr_->is_inited) return;
				DisableIgnores();
				if (!thr_->ignore_interceptors) {
				ProcessPendingSignals(thr_);
				FuncExit(thr_);
				CheckNoLocks(thr_);
				}
				}

				void ScopedInterceptor::EnableIgnores() {
				if (ignoring_) {
				ThreadIgnoreBegin(thr_, pc_, /save_stack=/false);
				if (flags()->ignore_noninstrumented_modules) thr_->suppress_reports++;
				if (in_ignored_lib_) {
				DCHECK(!thr_->in_ignored_lib);
				thr_->in_ignored_lib = true;
				}
				}
				}

				void ScopedInterceptor::DisableIgnores() {
				if (ignoring_) {
				ThreadIgnoreEnd(thr_, pc_);
				if (flags()->ignore_noninstrumented_modules) thr_->suppress_reports--;
				if (in_ignored_lib_) {
				DCHECK(thr_->in_ignored_lib);
				thr_->in_ignored_lib = false;
				}
				}
				}

				#define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
				#if SANITIZER_FREEBSD
				# define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION(func)
				# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func)
				# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func)
				#elif SANITIZER_NETBSD
				# define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION(func)
				# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func) \
				INTERCEPT_FUNCTION(__libc_##func)
				# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func) \
				INTERCEPT_FUNCTION(__libc_thr_##func)
				#else
				# define TSAN_INTERCEPT_VER(func, ver) INTERCEPT_FUNCTION_VER(func, ver)
				# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(func)
				# define TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(func)
				#endif

				#define READ_STRING_OF_LEN(thr, pc, s, len, n) \
				MemoryAccessRange((thr), (pc), (uptr)(s), \
				common_flags()->strict_string_checks ? (len) + 1 : (n), false)

				#define READ_STRING(thr, pc, s, n) \
				READ_STRING_OF_LEN((thr), (pc), (s), internal_strlen(s), (n))

				#define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))

				struct BlockingCall {
				explicit BlockingCall(ThreadState *thr)
				: thr(thr)
				, ctx(SigCtx(thr)) {
				for (;;) {
				atomic_store(&ctx->in_blocking_func, 1, memory_order_relaxed);
				if (atomic_load(&ctx->have_pending_signals, memory_order_relaxed) == 0)
				break;
				atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
				ProcessPendingSignals(thr);
				}
				// When we are in a "blocking call", we process signals asynchronously
				// (right when they arrive). In this context we do not expect to be
				// executing any user/runtime code. The known interceptor sequence when
				// this is not true is: pthread_join -> munmap(stack). It's fine
				// to ignore munmap in this case -- we handle stack shadow separately.
				thr->ignore_interceptors++;
				}

				~BlockingCall() {
				thr->ignore_interceptors--;
				atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
				}

				ThreadState *thr;
				ThreadSignalContext *ctx;
				};

				TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
				SCOPED_TSAN_INTERCEPTOR(sleep, sec);
				unsigned res = BLOCK_REAL(sleep)(sec);
				AfterSleep(thr, pc);
				return res;
				}

				TSAN_INTERCEPTOR(int, usleep, long_t usec) {
				SCOPED_TSAN_INTERCEPTOR(usleep, usec);
				int res = BLOCK_REAL(usleep)(usec);
				AfterSleep(thr, pc);
				return res;
				}

				TSAN_INTERCEPTOR(int, nanosleep, void req, void rem) {
				SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
				int res = BLOCK_REAL(nanosleep)(req, rem);
				AfterSleep(thr, pc);
				return res;
				}

				TSAN_INTERCEPTOR(int, pause, int fake) {
				SCOPED_TSAN_INTERCEPTOR(pause, fake);
				return BLOCK_REAL(pause)(fake);
				}

				static void at_exit_wrapper() {
				AtExitCtx *ctx;
				{
				// Ensure thread-safety.
				BlockingMutexLock l(&interceptor_ctx()->atexit_mu);

				// Pop AtExitCtx from the top of the stack of callback functions
				uptr element = interceptor_ctx()->AtExitStack.Size() - 1;
				ctx = interceptor_ctx()->AtExitStack[element];
				interceptor_ctx()->AtExitStack.PopBack();
				}

				Acquire(cur_thread(), (uptr)0, (uptr)ctx);
				((void(*)())ctx->f)();
				InternalFree(ctx);
				}

				static void cxa_at_exit_wrapper(void *arg) {
				Acquire(cur_thread(), 0, (uptr)arg);
				AtExitCtx ctx = (AtExitCtx)arg;
				((void()(void arg))ctx->f)(ctx->arg);
				InternalFree(ctx);
				}

				static int setup_at_exit_wrapper(ThreadState thr, uptr pc, void(f)(),
				void arg, void dso);

				#if !SANITIZER_ANDROID
				TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
				if (in_symbolizer())
				return 0;
				// We want to setup the atexit callback even if we are in ignored lib
				// or after fork.
				SCOPED_INTERCEPTOR_RAW(atexit, f);
				return setup_at_exit_wrapper(thr, pc, (void(*)())f, 0, 0);
				}
				#endif

				TSAN_INTERCEPTOR(int, __cxa_atexit, void (f)(void a), void arg, void dso) {
				if (in_symbolizer())
				return 0;
				SCOPED_TSAN_INTERCEPTOR(__cxa_atexit, f, arg, dso);
				return setup_at_exit_wrapper(thr, pc, (void(*)())f, arg, dso);
				}

				static int setup_at_exit_wrapper(ThreadState thr, uptr pc, void(f)(),
				void arg, void dso) {
				AtExitCtx ctx = (AtExitCtx)InternalAlloc(sizeof(AtExitCtx));
				ctx->f = f;
				ctx->arg = arg;
				Release(thr, pc, (uptr)ctx);
				// Memory allocation in __cxa_atexit will race with free during exit,
				// because we do not see synchronization around atexit callback list.
				ThreadIgnoreBegin(thr, pc);
				int res;
				if (!dso) {
				// NetBSD does not preserve the 2nd argument if dso is equal to 0
				// Store ctx in a local stack-like structure

				// Ensure thread-safety.
				BlockingMutexLock l(&interceptor_ctx()->atexit_mu);

				res = REAL(__cxa_atexit)((void ()(void a))at_exit_wrapper, 0, 0);
				// Push AtExitCtx on the top of the stack of callback functions
				if (!res) {
				interceptor_ctx()->AtExitStack.PushBack(ctx);
				}
				} else {
				res = REAL(__cxa_atexit)(cxa_at_exit_wrapper, ctx, dso);
				}
				ThreadIgnoreEnd(thr, pc);
				return res;
				}

				#if !SANITIZER_MAC && !SANITIZER_NETBSD
				static void on_exit_wrapper(int status, void *arg) {
				ThreadState *thr = cur_thread();
				uptr pc = 0;
				Acquire(thr, pc, (uptr)arg);
				AtExitCtx ctx = (AtExitCtx)arg;
				((void()(int status, void arg))ctx->f)(status, ctx->arg);
				InternalFree(ctx);
				}

				TSAN_INTERCEPTOR(int, on_exit, void(f)(int, void), void *arg) {
				if (in_symbolizer())
				return 0;
				SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
				AtExitCtx ctx = (AtExitCtx)InternalAlloc(sizeof(AtExitCtx));
				ctx->f = (void(*)())f;
				ctx->arg = arg;
				Release(thr, pc, (uptr)ctx);
				// Memory allocation in __cxa_atexit will race with free during exit,
				// because we do not see synchronization around atexit callback list.
				ThreadIgnoreBegin(thr, pc);
				int res = REAL(on_exit)(on_exit_wrapper, ctx);
				ThreadIgnoreEnd(thr, pc);
				return res;
				}
				#define TSAN_MAYBE_INTERCEPT_ON_EXIT TSAN_INTERCEPT(on_exit)
				#else
				#define TSAN_MAYBE_INTERCEPT_ON_EXIT
				#endif

				// Cleanup old bufs.
				static void JmpBufGarbageCollect(ThreadState *thr, uptr sp) {
				for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
				JmpBuf *buf = &thr->jmp_bufs[i];
				if (buf->sp <= sp) {
				uptr sz = thr->jmp_bufs.Size();
				internal_memcpy(buf, &thr->jmp_bufs[sz - 1], sizeof(*buf));
				thr->jmp_bufs.PopBack();
				i--;
				}
				}
				}

				static void SetJmp(ThreadState *thr, uptr sp) {
				if (!thr->is_inited) // called from libc guts during bootstrap
				return;
				// Cleanup old bufs.
				JmpBufGarbageCollect(thr, sp);
				// Remember the buf.
				JmpBuf *buf = thr->jmp_bufs.PushBack();
				buf->sp = sp;
				buf->shadow_stack_pos = thr->shadow_stack_pos;
				ThreadSignalContext *sctx = SigCtx(thr);
				buf->int_signal_send = sctx ? sctx->int_signal_send : 0;
				buf->in_blocking_func = sctx ?
				atomic_load(&sctx->in_blocking_func, memory_order_relaxed) :
				false;
				buf->in_signal_handler = atomic_load(&thr->in_signal_handler,
				memory_order_relaxed);
				}

				static void LongJmp(ThreadState thr, uptr env) {
				uptr sp = ExtractLongJmpSp(env);
				// Find the saved buf with matching sp.
				for (uptr i = 0; i < thr->jmp_bufs.Size(); i++) {
				JmpBuf *buf = &thr->jmp_bufs[i];
				if (buf->sp == sp) {
				CHECK_GE(thr->shadow_stack_pos, buf->shadow_stack_pos);
				// Unwind the stack.
				while (thr->shadow_stack_pos > buf->shadow_stack_pos)
				FuncExit(thr);
				ThreadSignalContext *sctx = SigCtx(thr);
				if (sctx) {
				sctx->int_signal_send = buf->int_signal_send;
				atomic_store(&sctx->in_blocking_func, buf->in_blocking_func,
				memory_order_relaxed);
				}
				atomic_store(&thr->in_signal_handler, buf->in_signal_handler,
				memory_order_relaxed);
				JmpBufGarbageCollect(thr, buf->sp - 1); // do not collect buf->sp
				return;
				}
				}
				Printf("ThreadSanitizer: can't find longjmp buf\n");
				CHECK(0);
				}

				// FIXME: put everything below into a common extern "C" block?
				extern "C" void __tsan_setjmp(uptr sp) {
				cur_thread_init();
				SetJmp(cur_thread(), sp);
				}

				#if SANITIZER_MAC
				TSAN_INTERCEPTOR(int, setjmp, void *env);
				TSAN_INTERCEPTOR(int, _setjmp, void *env);
				TSAN_INTERCEPTOR(int, sigsetjmp, void *env);
				#else // SANITIZER_MAC

				#if SANITIZER_NETBSD
				#define setjmp_symname __setjmp14
				#define sigsetjmp_symname __sigsetjmp14
				#else
				#define setjmp_symname setjmp
				#define sigsetjmp_symname sigsetjmp
				#endif

				#define TSAN_INTERCEPTOR_SETJMP_(x) __interceptor_ ## x
				#define TSAN_INTERCEPTOR_SETJMP__(x) TSAN_INTERCEPTOR_SETJMP_(x)
				#define TSAN_INTERCEPTOR_SETJMP TSAN_INTERCEPTOR_SETJMP__(setjmp_symname)
				#define TSAN_INTERCEPTOR_SIGSETJMP TSAN_INTERCEPTOR_SETJMP__(sigsetjmp_symname)

				#define TSAN_STRING_SETJMP SANITIZER_STRINGIFY(setjmp_symname)
				#define TSAN_STRING_SIGSETJMP SANITIZER_STRINGIFY(sigsetjmp_symname)

				// Not called. Merely to satisfy TSAN_INTERCEPT().
				extern "C" SANITIZER_INTERFACE_ATTRIBUTE
				int TSAN_INTERCEPTOR_SETJMP(void *env);
				extern "C" int TSAN_INTERCEPTOR_SETJMP(void *env) {
				CHECK(0);
				return 0;
				}

				// FIXME: any reason to have a separate declaration?
				extern "C" SANITIZER_INTERFACE_ATTRIBUTE
				int __interceptor__setjmp(void *env);
				extern "C" int __interceptor__setjmp(void *env) {
				CHECK(0);
				return 0;
				}

				extern "C" SANITIZER_INTERFACE_ATTRIBUTE
				int TSAN_INTERCEPTOR_SIGSETJMP(void *env);
				extern "C" int TSAN_INTERCEPTOR_SIGSETJMP(void *env) {
				CHECK(0);
				return 0;
				}

				#if !SANITIZER_NETBSD
				extern "C" SANITIZER_INTERFACE_ATTRIBUTE
				int __interceptor___sigsetjmp(void *env);
				extern "C" int __interceptor___sigsetjmp(void *env) {
				CHECK(0);
				return 0;
				}
				#endif

				extern "C" int setjmp_symname(void *env);
				extern "C" int _setjmp(void *env);
				extern "C" int sigsetjmp_symname(void *env);
				#if !SANITIZER_NETBSD
				extern "C" int __sigsetjmp(void *env);
				#endif
				DEFINE_REAL(int, setjmp_symname, void *env)
				DEFINE_REAL(int, _setjmp, void *env)
				DEFINE_REAL(int, sigsetjmp_symname, void *env)
				#if !SANITIZER_NETBSD
				DEFINE_REAL(int, __sigsetjmp, void *env)
				#endif
				#endif // SANITIZER_MAC

				#if SANITIZER_NETBSD
				#define longjmp_symname __longjmp14
				#define siglongjmp_symname __siglongjmp14
				#else
				#define longjmp_symname longjmp
				#define siglongjmp_symname siglongjmp
				#endif

				TSAN_INTERCEPTOR(void, longjmp_symname, uptr *env, int val) {
				// Note: if we call REAL(longjmp) in the context of ScopedInterceptor,
				// bad things will happen. We will jump over ScopedInterceptor dtor and can
				// leave thr->in_ignored_lib set.
				{
				SCOPED_INTERCEPTOR_RAW(longjmp_symname, env, val);
				}
				LongJmp(cur_thread(), env);
				REAL(longjmp_symname)(env, val);
				}

				TSAN_INTERCEPTOR(void, siglongjmp_symname, uptr *env, int val) {
				{
				SCOPED_INTERCEPTOR_RAW(siglongjmp_symname, env, val);
				}
				LongJmp(cur_thread(), env);
				REAL(siglongjmp_symname)(env, val);
				}

				#if SANITIZER_NETBSD
				TSAN_INTERCEPTOR(void, _longjmp, uptr *env, int val) {
				{
				SCOPED_INTERCEPTOR_RAW(_longjmp, env, val);
				}
				LongJmp(cur_thread(), env);
				REAL(_longjmp)(env, val);
				}
				#endif

				#if !SANITIZER_MAC
				TSAN_INTERCEPTOR(void*, malloc, uptr size) {
				if (in_symbolizer())
				return InternalAlloc(size);
				void *p = 0;
				{
				SCOPED_INTERCEPTOR_RAW(malloc, size);
				p = user_alloc(thr, pc, size);
				}
				invoke_malloc_hook(p, size);
				return p;
				}

				TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
				SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
				return user_memalign(thr, pc, align, sz);
				}

				TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
				if (in_symbolizer())
				return InternalCalloc(size, n);
				void *p = 0;
				{
				SCOPED_INTERCEPTOR_RAW(calloc, size, n);
				p = user_calloc(thr, pc, size, n);
				}
				invoke_malloc_hook(p, n * size);
				return p;
				}

				TSAN_INTERCEPTOR(void, realloc, void p, uptr size) {
				if (in_symbolizer())
				return InternalRealloc(p, size);
				if (p)
				invoke_free_hook(p);
				{
				SCOPED_INTERCEPTOR_RAW(realloc, p, size);
				p = user_realloc(thr, pc, p, size);
				}
				invoke_malloc_hook(p, size);
				return p;
				}

				TSAN_INTERCEPTOR(void, reallocarray, void p, uptr size, uptr n) {
				if (in_symbolizer())
				return InternalReallocArray(p, size, n);
				if (p)
				invoke_free_hook(p);
				{
				SCOPED_INTERCEPTOR_RAW(reallocarray, p, size, n);
				p = user_reallocarray(thr, pc, p, size, n);
				}
				invoke_malloc_hook(p, size);
				return p;
				}

				TSAN_INTERCEPTOR(void, free, void *p) {
				if (p == 0)
				return;
				if (in_symbolizer())
				return InternalFree(p);
				invoke_free_hook(p);
				SCOPED_INTERCEPTOR_RAW(free, p);
				user_free(thr, pc, p);
				}

				TSAN_INTERCEPTOR(void, cfree, void *p) {
				if (p == 0)
				return;
				if (in_symbolizer())
				return InternalFree(p);
				invoke_free_hook(p);
				SCOPED_INTERCEPTOR_RAW(cfree, p);
				user_free(thr, pc, p);
				}

				TSAN_INTERCEPTOR(uptr, malloc_usable_size, void *p) {
				SCOPED_INTERCEPTOR_RAW(malloc_usable_size, p);
				return user_alloc_usable_size(p);
				}
				#endif

				TSAN_INTERCEPTOR(char , strcpy, char dst, const char *src) {
				SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);
				uptr srclen = internal_strlen(src);
				MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
				MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
				return REAL(strcpy)(dst, src);
				}

				TSAN_INTERCEPTOR(char, strncpy, char dst, char *src, uptr n) {
				SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
				uptr srclen = internal_strnlen(src, n);
				MemoryAccessRange(thr, pc, (uptr)dst, n, true);
				MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
				return REAL(strncpy)(dst, src, n);
				}

				TSAN_INTERCEPTOR(char, strdup, const char str) {
				SCOPED_TSAN_INTERCEPTOR(strdup, str);
				// strdup will call malloc, so no instrumentation is required here.
				return REAL(strdup)(str);
				}

				// Zero out addr if it points into shadow memory and was provided as a hint
				// only, i.e., MAP_FIXED is not set.
				static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
				if (*addr) {
				if (!IsAppMem((uptr)addr) \|\| !IsAppMem((uptr)addr + sz - 1)) {
				if (flags & MAP_FIXED) {
				errno = errno_EINVAL;
				return false;
				} else {
				*addr = 0;
				}
				}
				}
				return true;
				}

				template <class Mmap>
				static void mmap_interceptor(ThreadState thr, uptr pc, Mmap real_mmap,
				void *addr, SIZE_T sz, int prot, int flags,
				int fd, OFF64_T off) {
				if (!fix_mmap_addr(&addr, sz, flags)) return MAP_FAILED;
				void *res = real_mmap(addr, sz, prot, flags, fd, off);
				if (res != MAP_FAILED) {
				if (fd > 0) FdAccess(thr, pc, fd);
				MemoryRangeImitateWriteOrResetRange(thr, pc, (uptr)res, sz);
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
				SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
				UnmapShadow(thr, (uptr)addr, sz);
				int res = REAL(munmap)(addr, sz);
				return res;
				}

				#if SANITIZER_LINUX
				TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
				SCOPED_INTERCEPTOR_RAW(memalign, align, sz);
				return user_memalign(thr, pc, align, sz);
				}
				#define TSAN_MAYBE_INTERCEPT_MEMALIGN TSAN_INTERCEPT(memalign)
				#else
				#define TSAN_MAYBE_INTERCEPT_MEMALIGN
				#endif

				#if !SANITIZER_MAC
				TSAN_INTERCEPTOR(void*, aligned_alloc, uptr align, uptr sz) {
				if (in_symbolizer())
				return InternalAlloc(sz, nullptr, align);
				SCOPED_INTERCEPTOR_RAW(aligned_alloc, align, sz);
				return user_aligned_alloc(thr, pc, align, sz);
				}

				TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
				if (in_symbolizer())
				return InternalAlloc(sz, nullptr, GetPageSizeCached());
				SCOPED_INTERCEPTOR_RAW(valloc, sz);
				return user_valloc(thr, pc, sz);
				}
				#endif

				#if SANITIZER_LINUX
				TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
				if (in_symbolizer()) {
				uptr PageSize = GetPageSizeCached();
				sz = sz ? RoundUpTo(sz, PageSize) : PageSize;
				return InternalAlloc(sz, nullptr, PageSize);
				}
				SCOPED_INTERCEPTOR_RAW(pvalloc, sz);
				return user_pvalloc(thr, pc, sz);
				}
				#define TSAN_MAYBE_INTERCEPT_PVALLOC TSAN_INTERCEPT(pvalloc)
				#else
				#define TSAN_MAYBE_INTERCEPT_PVALLOC
				#endif

				#if !SANITIZER_MAC
				TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
				if (in_symbolizer()) {
				void *p = InternalAlloc(sz, nullptr, align);
				if (!p)
				return errno_ENOMEM;
				*memptr = p;
				return 0;
				}
				SCOPED_INTERCEPTOR_RAW(posix_memalign, memptr, align, sz);
				return user_posix_memalign(thr, pc, memptr, align, sz);
				}
				#endif

				// __cxa_guard_acquire and friends need to be intercepted in a special way -
				// regular interceptors will break statically-linked libstdc++. Linux
				// interceptors are especially defined as weak functions (so that they don't
				// cause link errors when user defines them as well). So they silently
				// auto-disable themselves when such symbol is already present in the binary. If
				// we link libstdc++ statically, it will bring own __cxa_guard_acquire which
				// will silently replace our interceptor. That's why on Linux we simply export
				// these interceptors with INTERFACE_ATTRIBUTE.
				// On OS X, we don't support statically linking, so we just use a regular
				// interceptor.
				#if SANITIZER_MAC
				#define STDCXX_INTERCEPTOR TSAN_INTERCEPTOR
				#else
				#define STDCXX_INTERCEPTOR(rettype, name, ...) \
				extern "C" rettype INTERFACE_ATTRIBUTE name(__VA_ARGS__)
				#endif

				// Used in thread-safe function static initialization.
				STDCXX_INTERCEPTOR(int, __cxa_guard_acquire, atomic_uint32_t *g) {
				SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
				OnPotentiallyBlockingRegionBegin();
				auto on_exit = at_scope_exit(&OnPotentiallyBlockingRegionEnd);
				for (;;) {
				u32 cmp = atomic_load(g, memory_order_acquire);
				if (cmp == 0) {
				if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
				return 1;
				} else if (cmp == 1) {
				Acquire(thr, pc, (uptr)g);
				return 0;
				} else {
				internal_sched_yield();
				}
				}
				}

				STDCXX_INTERCEPTOR(void, __cxa_guard_release, atomic_uint32_t *g) {
				SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
				Release(thr, pc, (uptr)g);
				atomic_store(g, 1, memory_order_release);
				}

				STDCXX_INTERCEPTOR(void, __cxa_guard_abort, atomic_uint32_t *g) {
				SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
				atomic_store(g, 0, memory_order_relaxed);
				}

				namespace __tsan {
				void DestroyThreadState() {
				ThreadState *thr = cur_thread();
				Processor *proc = thr->proc();
				ThreadFinish(thr);
				ProcUnwire(proc, thr);
				ProcDestroy(proc);
				ThreadSignalContext *sctx = thr->signal_ctx;
				if (sctx) {
				thr->signal_ctx = 0;
				UnmapOrDie(sctx, sizeof(*sctx));
				}
				DTLS_Destroy();
				cur_thread_finalize();
				}
				} // namespace __tsan

				#if !SANITIZER_MAC && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
				static void thread_finalize(void *v) {
				uptr iter = (uptr)v;
				if (iter > 1) {
				if (pthread_setspecific(interceptor_ctx()->finalize_key,
				(void*)(iter - 1))) {
				Printf("ThreadSanitizer: failed to set thread key\n");
				Die();
				}
				return;
				}
				DestroyThreadState();
				}
				#endif


				struct ThreadParam {
				void* (callback)(void arg);
				void *param;
				atomic_uintptr_t tid;
				};

				extern "C" void __tsan_thread_start_func(void arg) {
				ThreadParam p = (ThreadParam)arg;
				void* (callback)(void arg) = p->callback;
				void *param = p->param;
				int tid = 0;
				{
				cur_thread_init();
				ThreadState *thr = cur_thread();
				// Thread-local state is not initialized yet.
				ScopedIgnoreInterceptors ignore;
				#if !SANITIZER_MAC && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
				ThreadIgnoreBegin(thr, 0);
				if (pthread_setspecific(interceptor_ctx()->finalize_key,
				(void *)GetPthreadDestructorIterations())) {
				Printf("ThreadSanitizer: failed to set thread key\n");
				Die();
				}
				ThreadIgnoreEnd(thr, 0);
				#endif
				while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
				internal_sched_yield();
				Processor *proc = ProcCreate();
				ProcWire(proc, thr);
				ThreadStart(thr, tid, GetTid(), ThreadType::Regular);
				atomic_store(&p->tid, 0, memory_order_release);
				}
				void *res = callback(param);
				// Prevent the callback from being tail called,
				// it mixes up stack traces.
				volatile int foo = 42;
				foo++;
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_create,
				void th, void attr, void (callback)(void), void param) {
				SCOPED_INTERCEPTOR_RAW(pthread_create, th, attr, callback, param);

				MaybeSpawnBackgroundThread();

				if (ctx->after_multithreaded_fork) {
				if (flags()->die_after_fork) {
				Report("ThreadSanitizer: starting new threads after multi-threaded "
				"fork is not supported. Dying (set die_after_fork=0 to override)\n");
				Die();
				} else {
				VPrintf(1, "ThreadSanitizer: starting new threads after multi-threaded "
				"fork is not supported (pid %d). Continuing because of "
				"die_after_fork=0, but you are on your own\n", internal_getpid());
				}
				}
				__sanitizer_pthread_attr_t myattr;
				if (attr == 0) {
				pthread_attr_init(&myattr);
				attr = &myattr;
				}
				int detached = 0;
				REAL(pthread_attr_getdetachstate)(attr, &detached);
				AdjustStackSize(attr);

				ThreadParam p;
				p.callback = callback;
				p.param = param;
				atomic_store(&p.tid, 0, memory_order_relaxed);
				int res = -1;
				{
				// Otherwise we see false positives in pthread stack manipulation.
				ScopedIgnoreInterceptors ignore;
				ThreadIgnoreBegin(thr, pc);
				res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
				ThreadIgnoreEnd(thr, pc);
				}
				if (res == 0) {
				int tid = ThreadCreate(thr, pc, (uptr)th, IsStateDetached(detached));
				CHECK_NE(tid, 0);
				// Synchronization on p.tid serves two purposes:
				// 1. ThreadCreate must finish before the new thread starts.
				// Otherwise the new thread can call pthread_detach, but the pthread_t
				// identifier is not yet registered in ThreadRegistry by ThreadCreate.
				// 2. ThreadStart must finish before this thread continues.
				// Otherwise, this thread can call pthread_detach and reset thr->sync
				// before the new thread got a chance to acquire from it in ThreadStart.
				atomic_store(&p.tid, tid, memory_order_release);
				while (atomic_load(&p.tid, memory_order_acquire) != 0)
				internal_sched_yield();
				}
				if (attr == &myattr)
				pthread_attr_destroy(&myattr);
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_join, void th, void *ret) {
				SCOPED_INTERCEPTOR_RAW(pthread_join, th, ret);
				int tid = ThreadTid(thr, pc, (uptr)th);
				ThreadIgnoreBegin(thr, pc);
				int res = BLOCK_REAL(pthread_join)(th, ret);
				ThreadIgnoreEnd(thr, pc);
				if (res == 0) {
				ThreadJoin(thr, pc, tid);
				}
				return res;
				}

				DEFINE_REAL_PTHREAD_FUNCTIONS

				TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
				SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
				int tid = ThreadTid(thr, pc, (uptr)th);
				int res = REAL(pthread_detach)(th);
				if (res == 0) {
				ThreadDetach(thr, pc, tid);
				}
				return res;
				}

				TSAN_INTERCEPTOR(void, pthread_exit, void *retval) {
				{
				SCOPED_INTERCEPTOR_RAW(pthread_exit, retval);
				#if !SANITIZER_MAC && !SANITIZER_ANDROID
				CHECK_EQ(thr, &cur_thread_placeholder);
				#endif
				}
				REAL(pthread_exit)(retval);
				}

				#if SANITIZER_LINUX
				TSAN_INTERCEPTOR(int, pthread_tryjoin_np, void th, void *ret) {
				SCOPED_TSAN_INTERCEPTOR(pthread_tryjoin_np, th, ret);
				int tid = ThreadTid(thr, pc, (uptr)th);
				ThreadIgnoreBegin(thr, pc);
				int res = REAL(pthread_tryjoin_np)(th, ret);
				ThreadIgnoreEnd(thr, pc);
				if (res == 0)
				ThreadJoin(thr, pc, tid);
				else
				ThreadNotJoined(thr, pc, tid, (uptr)th);
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_timedjoin_np, void th, void *ret,
				const struct timespec *abstime) {
				SCOPED_TSAN_INTERCEPTOR(pthread_timedjoin_np, th, ret, abstime);
				int tid = ThreadTid(thr, pc, (uptr)th);
				ThreadIgnoreBegin(thr, pc);
				int res = BLOCK_REAL(pthread_timedjoin_np)(th, ret, abstime);
				ThreadIgnoreEnd(thr, pc);
				if (res == 0)
				ThreadJoin(thr, pc, tid);
				else
				ThreadNotJoined(thr, pc, tid, (uptr)th);
				return res;
				}
				#endif

				// Problem:
				// NPTL implementation of pthread_cond has 2 versions (2.2.5 and 2.3.2).
				// pthread_cond_t has different size in the different versions.
				// If call new REAL functions for old pthread_cond_t, they will corrupt memory
				// after pthread_cond_t (old cond is smaller).
				// If we call old REAL functions for new pthread_cond_t, we will lose some
				// functionality (e.g. old functions do not support waiting against
				// CLOCK_REALTIME).
				// Proper handling would require to have 2 versions of interceptors as well.
				// But this is messy, in particular requires linker scripts when sanitizer
				// runtime is linked into a shared library.
				// Instead we assume we don't have dynamic libraries built against old
				// pthread (2.2.5 is dated by 2002). And provide legacy_pthread_cond flag
				// that allows to work with old libraries (but this mode does not support
				// some features, e.g. pthread_condattr_getpshared).
				static void init_cond(void c, bool force = false) {
				// sizeof(pthread_cond_t) >= sizeof(uptr) in both versions.
				// So we allocate additional memory on the side large enough to hold
				// any pthread_cond_t object. Always call new REAL functions, but pass
				// the aux object to them.
				// Note: the code assumes that PTHREAD_COND_INITIALIZER initializes
				// first word of pthread_cond_t to zero.
				// It's all relevant only for linux.
				if (!common_flags()->legacy_pthread_cond)
				return c;
				atomic_uintptr_t p = (atomic_uintptr_t)c;
				uptr cond = atomic_load(p, memory_order_acquire);
				if (!force && cond != 0)
				return (void*)cond;
				void *newcond = WRAP(malloc)(pthread_cond_t_sz);
				internal_memset(newcond, 0, pthread_cond_t_sz);
				if (atomic_compare_exchange_strong(p, &cond, (uptr)newcond,
				memory_order_acq_rel))
				return newcond;
				WRAP(free)(newcond);
				return (void*)cond;
				}

				struct CondMutexUnlockCtx {
				ScopedInterceptor *si;
				ThreadState *thr;
				uptr pc;
				void *m;
				};

				static void cond_mutex_unlock(CondMutexUnlockCtx *arg) {
				// pthread_cond_wait interceptor has enabled async signal delivery
				// (see BlockingCall below). Disable async signals since we are running
				// tsan code. Also ScopedInterceptor and BlockingCall destructors won't run
				// since the thread is cancelled, so we have to manually execute them
				// (the thread still can run some user code due to pthread_cleanup_push).
				ThreadSignalContext *ctx = SigCtx(arg->thr);
				CHECK_EQ(atomic_load(&ctx->in_blocking_func, memory_order_relaxed), 1);
				atomic_store(&ctx->in_blocking_func, 0, memory_order_relaxed);
				MutexPostLock(arg->thr, arg->pc, (uptr)arg->m, MutexFlagDoPreLockOnPostLock);
				// Undo BlockingCall ctor effects.
				arg->thr->ignore_interceptors--;
				arg->si->~ScopedInterceptor();
				}

				INTERCEPTOR(int, pthread_cond_init, void c, void a) {
				void *cond = init_cond(c, true);
				SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, cond, a);
				MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);
				return REAL(pthread_cond_init)(cond, a);
				}

				static int cond_wait(ThreadState thr, uptr pc, ScopedInterceptor si,
				int (fn)(void c, void m, void abstime), void *c,
				void m, void t) {
				MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
				MutexUnlock(thr, pc, (uptr)m);
				CondMutexUnlockCtx arg = {si, thr, pc, m};
				int res = 0;
				// This ensures that we handle mutex lock even in case of pthread_cancel.
				// See test/tsan/cond_cancel.cpp.
				{
				// Enable signal delivery while the thread is blocked.
				BlockingCall bc(thr);
				res = call_pthread_cancel_with_cleanup(
				fn, c, m, t, (void ()(void arg))cond_mutex_unlock, &arg);
				}
				if (res == errno_EOWNERDEAD) MutexRepair(thr, pc, (uptr)m);
				MutexPostLock(thr, pc, (uptr)m, MutexFlagDoPreLockOnPostLock);
				return res;
				}

				INTERCEPTOR(int, pthread_cond_wait, void c, void m) {
				void *cond = init_cond(c);
				SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, cond, m);
				return cond_wait(thr, pc, &si, (int ()(void c, void m, void abstime))REAL(
				pthread_cond_wait),
				cond, m, 0);
				}

				INTERCEPTOR(int, pthread_cond_timedwait, void c, void m, void *abstime) {
				void *cond = init_cond(c);
				SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, cond, m, abstime);
				return cond_wait(thr, pc, &si, REAL(pthread_cond_timedwait), cond, m,
				abstime);
				}

				#if SANITIZER_MAC
				INTERCEPTOR(int, pthread_cond_timedwait_relative_np, void c, void m,
				void *reltime) {
				void *cond = init_cond(c);
				SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait_relative_np, cond, m, reltime);
				return cond_wait(thr, pc, &si, REAL(pthread_cond_timedwait_relative_np), cond,
				m, reltime);
				}
				#endif

				INTERCEPTOR(int, pthread_cond_signal, void *c) {
				void *cond = init_cond(c);
				SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, cond);
				MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
				return REAL(pthread_cond_signal)(cond);
				}

				INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
				void *cond = init_cond(c);
				SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, cond);
				MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), false);
				return REAL(pthread_cond_broadcast)(cond);
				}

				INTERCEPTOR(int, pthread_cond_destroy, void *c) {
				void *cond = init_cond(c);
				SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, cond);
				MemoryAccessRange(thr, pc, (uptr)c, sizeof(uptr), true);
				int res = REAL(pthread_cond_destroy)(cond);
				if (common_flags()->legacy_pthread_cond) {
				// Free our aux cond and zero the pointer to not leave dangling pointers.
				WRAP(free)(cond);
				atomic_store((atomic_uintptr_t*)c, 0, memory_order_relaxed);
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_mutex_init, void m, void a) {
				SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
				int res = REAL(pthread_mutex_init)(m, a);
				if (res == 0) {
				u32 flagz = 0;
				if (a) {
				int type = 0;
				if (REAL(pthread_mutexattr_gettype)(a, &type) == 0)
				if (type == PTHREAD_MUTEX_RECURSIVE \|\|
				type == PTHREAD_MUTEX_RECURSIVE_NP)
				flagz \|= MutexFlagWriteReentrant;
				}
				MutexCreate(thr, pc, (uptr)m, flagz);
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
				SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
				int res = REAL(pthread_mutex_destroy)(m);
				if (res == 0 \|\| res == errno_EBUSY) {
				MutexDestroy(thr, pc, (uptr)m);
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
				SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
				int res = REAL(pthread_mutex_trylock)(m);
				if (res == errno_EOWNERDEAD)
				MutexRepair(thr, pc, (uptr)m);
				if (res == 0 \|\| res == errno_EOWNERDEAD)
				MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
				return res;
				}

				#if !SANITIZER_MAC
				TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void m, void abstime) {
				SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
				int res = REAL(pthread_mutex_timedlock)(m, abstime);
				if (res == 0) {
				MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
				}
				return res;
				}
				#endif

				#if !SANITIZER_MAC
				TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
				SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
				int res = REAL(pthread_spin_init)(m, pshared);
				if (res == 0) {
				MutexCreate(thr, pc, (uptr)m);
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
				SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
				int res = REAL(pthread_spin_destroy)(m);
				if (res == 0) {
				MutexDestroy(thr, pc, (uptr)m);
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
				SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
				MutexPreLock(thr, pc, (uptr)m);
				int res = REAL(pthread_spin_lock)(m);
				if (res == 0) {
				MutexPostLock(thr, pc, (uptr)m);
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
				SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
				int res = REAL(pthread_spin_trylock)(m);
				if (res == 0) {
				MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
				SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
				MutexUnlock(thr, pc, (uptr)m);
				int res = REAL(pthread_spin_unlock)(m);
				return res;
				}
				#endif

				TSAN_INTERCEPTOR(int, pthread_rwlock_init, void m, void a) {
				SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
				int res = REAL(pthread_rwlock_init)(m, a);
				if (res == 0) {
				MutexCreate(thr, pc, (uptr)m);
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
				SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
				int res = REAL(pthread_rwlock_destroy)(m);
				if (res == 0) {
				MutexDestroy(thr, pc, (uptr)m);
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
				SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
				MutexPreReadLock(thr, pc, (uptr)m);
				int res = REAL(pthread_rwlock_rdlock)(m);
				if (res == 0) {
				MutexPostReadLock(thr, pc, (uptr)m);
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
				SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
				int res = REAL(pthread_rwlock_tryrdlock)(m);
				if (res == 0) {
				MutexPostReadLock(thr, pc, (uptr)m, MutexFlagTryLock);
				}
				return res;
				}

				#if !SANITIZER_MAC
				TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void m, void abstime) {
				SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
				int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
				if (res == 0) {
				MutexPostReadLock(thr, pc, (uptr)m);
				}
				return res;
				}
				#endif

				TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
				SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
				MutexPreLock(thr, pc, (uptr)m);
				int res = REAL(pthread_rwlock_wrlock)(m);
				if (res == 0) {
				MutexPostLock(thr, pc, (uptr)m);
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
				SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
				int res = REAL(pthread_rwlock_trywrlock)(m);
				if (res == 0) {
				MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
				}
				return res;
				}

				#if !SANITIZER_MAC
				TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void m, void abstime) {
				SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
				int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
				if (res == 0) {
				MutexPostLock(thr, pc, (uptr)m, MutexFlagTryLock);
				}
				return res;
				}
				#endif

				TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
				SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
				MutexReadOrWriteUnlock(thr, pc, (uptr)m);
				int res = REAL(pthread_rwlock_unlock)(m);
				return res;
				}

				#if !SANITIZER_MAC
				TSAN_INTERCEPTOR(int, pthread_barrier_init, void b, void a, unsigned count) {
				SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
				MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
				int res = REAL(pthread_barrier_init)(b, a, count);
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
				SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
				MemoryWrite(thr, pc, (uptr)b, kSizeLog1);
				int res = REAL(pthread_barrier_destroy)(b);
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
				SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
				Release(thr, pc, (uptr)b);
				MemoryRead(thr, pc, (uptr)b, kSizeLog1);
				int res = REAL(pthread_barrier_wait)(b);
				MemoryRead(thr, pc, (uptr)b, kSizeLog1);
				if (res == 0 \|\| res == PTHREAD_BARRIER_SERIAL_THREAD) {
				Acquire(thr, pc, (uptr)b);
				}
				return res;
				}
				#endif

				TSAN_INTERCEPTOR(int, pthread_once, void o, void (f)()) {
				SCOPED_INTERCEPTOR_RAW(pthread_once, o, f);
				if (o == 0 \|\| f == 0)
				return errno_EINVAL;
				atomic_uint32_t *a;

				if (SANITIZER_MAC)
				a = static_cast<atomic_uint32_t>((void )((char *)o + sizeof(long_t)));
				else if (SANITIZER_NETBSD)
				a = static_cast<atomic_uint32_t*>
				((void )((char )o + __sanitizer::pthread_mutex_t_sz));
				else
				a = static_cast<atomic_uint32_t*>(o);

				u32 v = atomic_load(a, memory_order_acquire);
				if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
				memory_order_relaxed)) {
				(*f)();
				if (!thr->in_ignored_lib)
				Release(thr, pc, (uptr)o);
				atomic_store(a, 2, memory_order_release);
				} else {
				while (v != 2) {
				internal_sched_yield();
				v = atomic_load(a, memory_order_acquire);
				}
				if (!thr->in_ignored_lib)
				Acquire(thr, pc, (uptr)o);
				}
				return 0;
				}

				#if SANITIZER_LINUX && !SANITIZER_ANDROID
				TSAN_INTERCEPTOR(int, __fxstat, int version, int fd, void *buf) {
				SCOPED_TSAN_INTERCEPTOR(__fxstat, version, fd, buf);
				if (fd > 0)
				FdAccess(thr, pc, fd);
				return REAL(__fxstat)(version, fd, buf);
				}
				#define TSAN_MAYBE_INTERCEPT___FXSTAT TSAN_INTERCEPT(__fxstat)
				#else
				#define TSAN_MAYBE_INTERCEPT___FXSTAT
				#endif

				TSAN_INTERCEPTOR(int, fstat, int fd, void *buf) {
				#if SANITIZER_FREEBSD \|\| SANITIZER_MAC \|\| SANITIZER_ANDROID \|\| SANITIZER_NETBSD
				SCOPED_TSAN_INTERCEPTOR(fstat, fd, buf);
				if (fd > 0)
				FdAccess(thr, pc, fd);
				return REAL(fstat)(fd, buf);
				#else
				SCOPED_TSAN_INTERCEPTOR(__fxstat, 0, fd, buf);
				if (fd > 0)
				FdAccess(thr, pc, fd);
				return REAL(__fxstat)(0, fd, buf);
				#endif
				}

				#if SANITIZER_LINUX && !SANITIZER_ANDROID
				TSAN_INTERCEPTOR(int, __fxstat64, int version, int fd, void *buf) {
				SCOPED_TSAN_INTERCEPTOR(__fxstat64, version, fd, buf);
				if (fd > 0)
				FdAccess(thr, pc, fd);
				return REAL(__fxstat64)(version, fd, buf);
				}
				#define TSAN_MAYBE_INTERCEPT___FXSTAT64 TSAN_INTERCEPT(__fxstat64)
				#else
				#define TSAN_MAYBE_INTERCEPT___FXSTAT64
				#endif

				#if SANITIZER_LINUX && !SANITIZER_ANDROID
				TSAN_INTERCEPTOR(int, fstat64, int fd, void *buf) {
				SCOPED_TSAN_INTERCEPTOR(__fxstat64, 0, fd, buf);
				if (fd > 0)
				FdAccess(thr, pc, fd);
				return REAL(__fxstat64)(0, fd, buf);
				}
				#define TSAN_MAYBE_INTERCEPT_FSTAT64 TSAN_INTERCEPT(fstat64)
				#else
				#define TSAN_MAYBE_INTERCEPT_FSTAT64
				#endif

				TSAN_INTERCEPTOR(int, open, const char *name, int flags, int mode) {
				SCOPED_TSAN_INTERCEPTOR(open, name, flags, mode);
				READ_STRING(thr, pc, name, 0);
				int fd = REAL(open)(name, flags, mode);
				if (fd >= 0)
				FdFileCreate(thr, pc, fd);
				return fd;
				}

				#if SANITIZER_LINUX
				TSAN_INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
				SCOPED_TSAN_INTERCEPTOR(open64, name, flags, mode);
				READ_STRING(thr, pc, name, 0);
				int fd = REAL(open64)(name, flags, mode);
				if (fd >= 0)
				FdFileCreate(thr, pc, fd);
				return fd;
				}
				#define TSAN_MAYBE_INTERCEPT_OPEN64 TSAN_INTERCEPT(open64)
				#else
				#define TSAN_MAYBE_INTERCEPT_OPEN64
				#endif

				TSAN_INTERCEPTOR(int, creat, const char *name, int mode) {
				SCOPED_TSAN_INTERCEPTOR(creat, name, mode);
				READ_STRING(thr, pc, name, 0);
				int fd = REAL(creat)(name, mode);
				if (fd >= 0)
				FdFileCreate(thr, pc, fd);
				return fd;
				}

				#if SANITIZER_LINUX
				TSAN_INTERCEPTOR(int, creat64, const char *name, int mode) {
				SCOPED_TSAN_INTERCEPTOR(creat64, name, mode);
				READ_STRING(thr, pc, name, 0);
				int fd = REAL(creat64)(name, mode);
				if (fd >= 0)
				FdFileCreate(thr, pc, fd);
				return fd;
				}
				#define TSAN_MAYBE_INTERCEPT_CREAT64 TSAN_INTERCEPT(creat64)
				#else
				#define TSAN_MAYBE_INTERCEPT_CREAT64
				#endif

				TSAN_INTERCEPTOR(int, dup, int oldfd) {
				SCOPED_TSAN_INTERCEPTOR(dup, oldfd);
				int newfd = REAL(dup)(oldfd);
				if (oldfd >= 0 && newfd >= 0 && newfd != oldfd)
				FdDup(thr, pc, oldfd, newfd, true);
				return newfd;
				}

				TSAN_INTERCEPTOR(int, dup2, int oldfd, int newfd) {
				SCOPED_TSAN_INTERCEPTOR(dup2, oldfd, newfd);
				int newfd2 = REAL(dup2)(oldfd, newfd);
				if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
				FdDup(thr, pc, oldfd, newfd2, false);
				return newfd2;
				}

				#if !SANITIZER_MAC
				TSAN_INTERCEPTOR(int, dup3, int oldfd, int newfd, int flags) {
				SCOPED_TSAN_INTERCEPTOR(dup3, oldfd, newfd, flags);
				int newfd2 = REAL(dup3)(oldfd, newfd, flags);
				if (oldfd >= 0 && newfd2 >= 0 && newfd2 != oldfd)
				FdDup(thr, pc, oldfd, newfd2, false);
				return newfd2;
				}
				#endif

				#if SANITIZER_LINUX
				TSAN_INTERCEPTOR(int, eventfd, unsigned initval, int flags) {
				SCOPED_TSAN_INTERCEPTOR(eventfd, initval, flags);
				int fd = REAL(eventfd)(initval, flags);
				if (fd >= 0)
				FdEventCreate(thr, pc, fd);
				return fd;
				}
				#define TSAN_MAYBE_INTERCEPT_EVENTFD TSAN_INTERCEPT(eventfd)
				#else
				#define TSAN_MAYBE_INTERCEPT_EVENTFD
				#endif

				#if SANITIZER_LINUX
				TSAN_INTERCEPTOR(int, signalfd, int fd, void *mask, int flags) {
				SCOPED_TSAN_INTERCEPTOR(signalfd, fd, mask, flags);
				if (fd >= 0)
				FdClose(thr, pc, fd);
				fd = REAL(signalfd)(fd, mask, flags);
				if (fd >= 0)
				FdSignalCreate(thr, pc, fd);
				return fd;
				}
				#define TSAN_MAYBE_INTERCEPT_SIGNALFD TSAN_INTERCEPT(signalfd)
				#else
				#define TSAN_MAYBE_INTERCEPT_SIGNALFD
				#endif

				#if SANITIZER_LINUX
				TSAN_INTERCEPTOR(int, inotify_init, int fake) {
				SCOPED_TSAN_INTERCEPTOR(inotify_init, fake);
				int fd = REAL(inotify_init)(fake);
				if (fd >= 0)
				FdInotifyCreate(thr, pc, fd);
				return fd;
				}
				#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT TSAN_INTERCEPT(inotify_init)
				#else
				#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT
				#endif

				#if SANITIZER_LINUX
				TSAN_INTERCEPTOR(int, inotify_init1, int flags) {
				SCOPED_TSAN_INTERCEPTOR(inotify_init1, flags);
				int fd = REAL(inotify_init1)(flags);
				if (fd >= 0)
				FdInotifyCreate(thr, pc, fd);
				return fd;
				}
				#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1 TSAN_INTERCEPT(inotify_init1)
				#else
				#define TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1
				#endif

				TSAN_INTERCEPTOR(int, socket, int domain, int type, int protocol) {
				SCOPED_TSAN_INTERCEPTOR(socket, domain, type, protocol);
				int fd = REAL(socket)(domain, type, protocol);
				if (fd >= 0)
				FdSocketCreate(thr, pc, fd);
				return fd;
				}

				TSAN_INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int *fd) {
				SCOPED_TSAN_INTERCEPTOR(socketpair, domain, type, protocol, fd);
				int res = REAL(socketpair)(domain, type, protocol, fd);
				if (res == 0 && fd[0] >= 0 && fd[1] >= 0)
				FdPipeCreate(thr, pc, fd[0], fd[1]);
				return res;
				}

				TSAN_INTERCEPTOR(int, connect, int fd, void *addr, unsigned addrlen) {
				SCOPED_TSAN_INTERCEPTOR(connect, fd, addr, addrlen);
				FdSocketConnecting(thr, pc, fd);
				int res = REAL(connect)(fd, addr, addrlen);
				if (res == 0 && fd >= 0)
				FdSocketConnect(thr, pc, fd);
				return res;
				}

				TSAN_INTERCEPTOR(int, bind, int fd, void *addr, unsigned addrlen) {
				SCOPED_TSAN_INTERCEPTOR(bind, fd, addr, addrlen);
				int res = REAL(bind)(fd, addr, addrlen);
				if (fd > 0 && res == 0)
				FdAccess(thr, pc, fd);
				return res;
				}

				TSAN_INTERCEPTOR(int, listen, int fd, int backlog) {
				SCOPED_TSAN_INTERCEPTOR(listen, fd, backlog);
				int res = REAL(listen)(fd, backlog);
				if (fd > 0 && res == 0)
				FdAccess(thr, pc, fd);
				return res;
				}

				TSAN_INTERCEPTOR(int, close, int fd) {
				SCOPED_TSAN_INTERCEPTOR(close, fd);
				if (fd >= 0)
				FdClose(thr, pc, fd);
				return REAL(close)(fd);
				}

				#if SANITIZER_LINUX
				TSAN_INTERCEPTOR(int, __close, int fd) {
				SCOPED_TSAN_INTERCEPTOR(__close, fd);
				if (fd >= 0)
				FdClose(thr, pc, fd);
				return REAL(__close)(fd);
				}
				#define TSAN_MAYBE_INTERCEPT___CLOSE TSAN_INTERCEPT(__close)
				#else
				#define TSAN_MAYBE_INTERCEPT___CLOSE
				#endif

				// glibc guts
				#if SANITIZER_LINUX && !SANITIZER_ANDROID
				TSAN_INTERCEPTOR(void, __res_iclose, void *state, bool free_addr) {
				SCOPED_TSAN_INTERCEPTOR(__res_iclose, state, free_addr);
				int fds[64];
				int cnt = ExtractResolvFDs(state, fds, ARRAY_SIZE(fds));
				for (int i = 0; i < cnt; i++) {
				if (fds[i] > 0)
				FdClose(thr, pc, fds[i]);
				}
				REAL(__res_iclose)(state, free_addr);
				}
				#define TSAN_MAYBE_INTERCEPT___RES_ICLOSE TSAN_INTERCEPT(__res_iclose)
				#else
				#define TSAN_MAYBE_INTERCEPT___RES_ICLOSE
				#endif

				TSAN_INTERCEPTOR(int, pipe, int *pipefd) {
				SCOPED_TSAN_INTERCEPTOR(pipe, pipefd);
				int res = REAL(pipe)(pipefd);
				if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
				FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
				return res;
				}

				#if !SANITIZER_MAC
				TSAN_INTERCEPTOR(int, pipe2, int *pipefd, int flags) {
				SCOPED_TSAN_INTERCEPTOR(pipe2, pipefd, flags);
				int res = REAL(pipe2)(pipefd, flags);
				if (res == 0 && pipefd[0] >= 0 && pipefd[1] >= 0)
				FdPipeCreate(thr, pc, pipefd[0], pipefd[1]);
				return res;
				}
				#endif

				TSAN_INTERCEPTOR(int, unlink, char *path) {
				SCOPED_TSAN_INTERCEPTOR(unlink, path);
				Release(thr, pc, File2addr(path));
				int res = REAL(unlink)(path);
				return res;
				}

				TSAN_INTERCEPTOR(void*, tmpfile, int fake) {
				SCOPED_TSAN_INTERCEPTOR(tmpfile, fake);
				void *res = REAL(tmpfile)(fake);
				if (res) {
				int fd = fileno_unlocked(res);
				if (fd >= 0)
				FdFileCreate(thr, pc, fd);
				}
				return res;
				}

				#if SANITIZER_LINUX
				TSAN_INTERCEPTOR(void*, tmpfile64, int fake) {
				SCOPED_TSAN_INTERCEPTOR(tmpfile64, fake);
				void *res = REAL(tmpfile64)(fake);
				if (res) {
				int fd = fileno_unlocked(res);
				if (fd >= 0)
				FdFileCreate(thr, pc, fd);
				}
				return res;
				}
				#define TSAN_MAYBE_INTERCEPT_TMPFILE64 TSAN_INTERCEPT(tmpfile64)
				#else
				#define TSAN_MAYBE_INTERCEPT_TMPFILE64
				#endif

				static void FlushStreams() {
				// Flushing all the streams here may freeze the process if a child thread is
				// performing file stream operations at the same time.
				REAL(fflush)(stdout);
				REAL(fflush)(stderr);
				}

				TSAN_INTERCEPTOR(void, abort, int fake) {
				SCOPED_TSAN_INTERCEPTOR(abort, fake);
				FlushStreams();
				REAL(abort)(fake);
				}

				TSAN_INTERCEPTOR(int, rmdir, char *path) {
				SCOPED_TSAN_INTERCEPTOR(rmdir, path);
				Release(thr, pc, Dir2addr(path));
				int res = REAL(rmdir)(path);
				return res;
				}

				TSAN_INTERCEPTOR(int, closedir, void *dirp) {
				SCOPED_TSAN_INTERCEPTOR(closedir, dirp);
				if (dirp) {
				int fd = dirfd(dirp);
				FdClose(thr, pc, fd);
				}
				return REAL(closedir)(dirp);
				}

				#if SANITIZER_LINUX
				TSAN_INTERCEPTOR(int, epoll_create, int size) {
				SCOPED_TSAN_INTERCEPTOR(epoll_create, size);
				int fd = REAL(epoll_create)(size);
				if (fd >= 0)
				FdPollCreate(thr, pc, fd);
				return fd;
				}

				TSAN_INTERCEPTOR(int, epoll_create1, int flags) {
				SCOPED_TSAN_INTERCEPTOR(epoll_create1, flags);
				int fd = REAL(epoll_create1)(flags);
				if (fd >= 0)
				FdPollCreate(thr, pc, fd);
				return fd;
				}

				TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
				SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
				if (epfd >= 0)
				FdAccess(thr, pc, epfd);
				if (epfd >= 0 && fd >= 0)
				FdAccess(thr, pc, fd);
				if (op == EPOLL_CTL_ADD && epfd >= 0)
				FdRelease(thr, pc, epfd);
				int res = REAL(epoll_ctl)(epfd, op, fd, ev);
				return res;
				}

				TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
				SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
				if (epfd >= 0)
				FdAccess(thr, pc, epfd);
				int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
				if (res > 0 && epfd >= 0)
				FdAcquire(thr, pc, epfd);
				return res;
				}

				TSAN_INTERCEPTOR(int, epoll_pwait, int epfd, void *ev, int cnt, int timeout,
				void *sigmask) {
				SCOPED_TSAN_INTERCEPTOR(epoll_pwait, epfd, ev, cnt, timeout, sigmask);
				if (epfd >= 0)
				FdAccess(thr, pc, epfd);
				int res = BLOCK_REAL(epoll_pwait)(epfd, ev, cnt, timeout, sigmask);
				if (res > 0 && epfd >= 0)
				FdAcquire(thr, pc, epfd);
				return res;
				}

				#define TSAN_MAYBE_INTERCEPT_EPOLL \
				TSAN_INTERCEPT(epoll_create); \
				TSAN_INTERCEPT(epoll_create1); \
				TSAN_INTERCEPT(epoll_ctl); \
				TSAN_INTERCEPT(epoll_wait); \
				TSAN_INTERCEPT(epoll_pwait)
				#else
				#define TSAN_MAYBE_INTERCEPT_EPOLL
				#endif

				// The following functions are intercepted merely to process pending signals.
				// If program blocks signal X, we must deliver the signal before the function
				// returns. Similarly, if program unblocks a signal (or returns from sigsuspend)
				// it's better to deliver the signal straight away.
				TSAN_INTERCEPTOR(int, sigsuspend, const __sanitizer_sigset_t *mask) {
				SCOPED_TSAN_INTERCEPTOR(sigsuspend, mask);
				return REAL(sigsuspend)(mask);
				}

				TSAN_INTERCEPTOR(int, sigblock, int mask) {
				SCOPED_TSAN_INTERCEPTOR(sigblock, mask);
				return REAL(sigblock)(mask);
				}

				TSAN_INTERCEPTOR(int, sigsetmask, int mask) {
				SCOPED_TSAN_INTERCEPTOR(sigsetmask, mask);
				return REAL(sigsetmask)(mask);
				}

				TSAN_INTERCEPTOR(int, pthread_sigmask, int how, const __sanitizer_sigset_t *set,
				__sanitizer_sigset_t *oldset) {
				SCOPED_TSAN_INTERCEPTOR(pthread_sigmask, how, set, oldset);
				return REAL(pthread_sigmask)(how, set, oldset);
				}

				namespace __tsan {

				static void CallUserSignalHandler(ThreadState *thr, bool sync, bool acquire,
				bool sigact, int sig,
				__sanitizer_siginfo info, void uctx) {
				__sanitizer_sigaction *sigactions = interceptor_ctx()->sigactions;
				if (acquire)
				Acquire(thr, 0, (uptr)&sigactions[sig]);
				// Signals are generally asynchronous, so if we receive a signals when
				// ignores are enabled we should disable ignores. This is critical for sync
				// and interceptors, because otherwise we can miss syncronization and report
				// false races.
				int ignore_reads_and_writes = thr->ignore_reads_and_writes;
				int ignore_interceptors = thr->ignore_interceptors;
				int ignore_sync = thr->ignore_sync;
				if (!ctx->after_multithreaded_fork) {
				thr->ignore_reads_and_writes = 0;
				thr->fast_state.ClearIgnoreBit();
				thr->ignore_interceptors = 0;
				thr->ignore_sync = 0;
				}
				// Ensure that the handler does not spoil errno.
				const int saved_errno = errno;
				errno = 99;
				// This code races with sigaction. Be careful to not read sa_sigaction twice.
				// Also need to remember pc for reporting before the call,
				// because the handler can reset it.
				volatile uptr pc =
				sigact ? (uptr)sigactions[sig].sigaction : (uptr)sigactions[sig].handler;
				if (pc != sig_dfl && pc != sig_ign) {
				if (sigact)
				((__sanitizer_sigactionhandler_ptr)pc)(sig, info, uctx);
				else
				((__sanitizer_sighandler_ptr)pc)(sig);
				}
				if (!ctx->after_multithreaded_fork) {
				thr->ignore_reads_and_writes = ignore_reads_and_writes;
				if (ignore_reads_and_writes)
				thr->fast_state.SetIgnoreBit();
				thr->ignore_interceptors = ignore_interceptors;
				thr->ignore_sync = ignore_sync;
				}
				// We do not detect errno spoiling for SIGTERM,
				// because some SIGTERM handlers do spoil errno but reraise SIGTERM,
				// tsan reports false positive in such case.
				// It's difficult to properly detect this situation (reraise),
				// because in async signal processing case (when handler is called directly
				// from rtl_generic_sighandler) we have not yet received the reraised
				// signal; and it looks too fragile to intercept all ways to reraise a signal.
				if (flags()->report_bugs && !sync && sig != SIGTERM && errno != 99) {
				VarSizeStackTrace stack;
				// StackTrace::GetNestInstructionPc(pc) is used because return address is
				// expected, OutputReport() will undo this.
				ObtainCurrentStack(thr, StackTrace::GetNextInstructionPc(pc), &stack);
				ThreadRegistryLock l(ctx->thread_registry);
				ScopedReport rep(ReportTypeErrnoInSignal);
				if (!IsFiredSuppression(ctx, ReportTypeErrnoInSignal, stack)) {
				rep.AddStack(stack, true);
				OutputReport(thr, rep);
				}
				}
				errno = saved_errno;
				}

				void ProcessPendingSignals(ThreadState *thr) {
				ThreadSignalContext *sctx = SigCtx(thr);
				if (sctx == 0 \|\|
				atomic_load(&sctx->have_pending_signals, memory_order_relaxed) == 0)
				return;
				atomic_store(&sctx->have_pending_signals, 0, memory_order_relaxed);
				atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);
				internal_sigfillset(&sctx->emptyset);
				int res = REAL(pthread_sigmask)(SIG_SETMASK, &sctx->emptyset, &sctx->oldset);
				CHECK_EQ(res, 0);
				for (int sig = 0; sig < kSigCount; sig++) {
				SignalDesc *signal = &sctx->pending_signals[sig];
				if (signal->armed) {
				signal->armed = false;
				CallUserSignalHandler(thr, false, true, signal->sigaction, sig,
				&signal->siginfo, &signal->ctx);
				}
				}
				res = REAL(pthread_sigmask)(SIG_SETMASK, &sctx->oldset, 0);
				CHECK_EQ(res, 0);
				atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);
				}

				} // namespace __tsan

				static bool is_sync_signal(ThreadSignalContext *sctx, int sig) {
				return sig == SIGSEGV \|\| sig == SIGBUS \|\| sig == SIGILL \|\|
				sig == SIGABRT \|\| sig == SIGFPE \|\| sig == SIGPIPE \|\| sig == SIGSYS \|\|
				// If we are sending signal to ourselves, we must process it now.
				(sctx && sig == sctx->int_signal_send);
				}

				void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
				__sanitizer_siginfo *info,
				void *ctx) {
				cur_thread_init();
				ThreadState *thr = cur_thread();
				ThreadSignalContext *sctx = SigCtx(thr);
				if (sig < 0 \|\| sig >= kSigCount) {
				VPrintf(1, "ThreadSanitizer: ignoring signal %d\n", sig);
				return;
				}
				// Don't mess with synchronous signals.
				const bool sync = is_sync_signal(sctx, sig);
				if (sync \|\|
				// If we are in blocking function, we can safely process it now
				// (but check if we are in a recursive interceptor,
				// i.e. pthread_join()->munmap()).
				(sctx && atomic_load(&sctx->in_blocking_func, memory_order_relaxed))) {
				atomic_fetch_add(&thr->in_signal_handler, 1, memory_order_relaxed);
				if (sctx && atomic_load(&sctx->in_blocking_func, memory_order_relaxed)) {
				atomic_store(&sctx->in_blocking_func, 0, memory_order_relaxed);
				CallUserSignalHandler(thr, sync, true, sigact, sig, info, ctx);
				atomic_store(&sctx->in_blocking_func, 1, memory_order_relaxed);
				} else {
				// Be very conservative with when we do acquire in this case.
				// It's unsafe to do acquire in async handlers, because ThreadState
				// can be in inconsistent state.
				// SIGSYS looks relatively safe -- it's synchronous and can actually
				// need some global state.
				bool acq = (sig == SIGSYS);
				CallUserSignalHandler(thr, sync, acq, sigact, sig, info, ctx);
				}
				atomic_fetch_add(&thr->in_signal_handler, -1, memory_order_relaxed);
				return;
				}

				if (sctx == 0)
				return;
				SignalDesc *signal = &sctx->pending_signals[sig];
				if (signal->armed == false) {
				signal->armed = true;
				signal->sigaction = sigact;
				if (info)
				internal_memcpy(&signal->siginfo, info, sizeof(*info));
				if (ctx)
				internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
				atomic_store(&sctx->have_pending_signals, 1, memory_order_relaxed);
				}
				}

				static void rtl_sighandler(int sig) {
				rtl_generic_sighandler(false, sig, 0, 0);
				}

				static void rtl_sigaction(int sig, __sanitizer_siginfo info, void ctx) {
				rtl_generic_sighandler(true, sig, info, ctx);
				}

				TSAN_INTERCEPTOR(int, raise, int sig) {
				SCOPED_TSAN_INTERCEPTOR(raise, sig);
				ThreadSignalContext *sctx = SigCtx(thr);
				CHECK_NE(sctx, 0);
				int prev = sctx->int_signal_send;
				sctx->int_signal_send = sig;
				int res = REAL(raise)(sig);
				CHECK_EQ(sctx->int_signal_send, sig);
				sctx->int_signal_send = prev;
				return res;
				}

				TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
				SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
				ThreadSignalContext *sctx = SigCtx(thr);
				CHECK_NE(sctx, 0);
				int prev = sctx->int_signal_send;
				if (pid == (int)internal_getpid()) {
				sctx->int_signal_send = sig;
				}
				int res = REAL(kill)(pid, sig);
				if (pid == (int)internal_getpid()) {
				CHECK_EQ(sctx->int_signal_send, sig);
				sctx->int_signal_send = prev;
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
				SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
				ThreadSignalContext *sctx = SigCtx(thr);
				CHECK_NE(sctx, 0);
				int prev = sctx->int_signal_send;
				if (tid == pthread_self()) {
				sctx->int_signal_send = sig;
				}
				int res = REAL(pthread_kill)(tid, sig);
				if (tid == pthread_self()) {
				CHECK_EQ(sctx->int_signal_send, sig);
				sctx->int_signal_send = prev;
				}
				return res;
				}

				TSAN_INTERCEPTOR(int, gettimeofday, void tv, void tz) {
				SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
				// It's intercepted merely to process pending signals.
				return REAL(gettimeofday)(tv, tz);
				}

				TSAN_INTERCEPTOR(int, getaddrinfo, void node, void service,
				void hints, void rv) {
				SCOPED_TSAN_INTERCEPTOR(getaddrinfo, node, service, hints, rv);
				// We miss atomic synchronization in getaddrinfo,
				// and can report false race between malloc and free
				// inside of getaddrinfo. So ignore memory accesses.
				ThreadIgnoreBegin(thr, pc);
				int res = REAL(getaddrinfo)(node, service, hints, rv);
				ThreadIgnoreEnd(thr, pc);
				return res;
				}

				TSAN_INTERCEPTOR(int, fork, int fake) {
				if (in_symbolizer())
				return REAL(fork)(fake);
				SCOPED_INTERCEPTOR_RAW(fork, fake);
				ForkBefore(thr, pc);
				int pid;
				{
				// On OS X, REAL(fork) can call intercepted functions (OSSpinLockLock), and
				// we'll assert in CheckNoLocks() unless we ignore interceptors.
				ScopedIgnoreInterceptors ignore;
				pid = REAL(fork)(fake);
				}
				if (pid == 0) {
				// child
				ForkChildAfter(thr, pc);
				FdOnFork(thr, pc);
				} else if (pid > 0) {
				// parent
				ForkParentAfter(thr, pc);
				} else {
				// error
				ForkParentAfter(thr, pc);
				}
				return pid;
				}

				TSAN_INTERCEPTOR(int, vfork, int fake) {
				// Some programs (e.g. openjdk) call close for all file descriptors
				// in the child process. Under tsan it leads to false positives, because
				// address space is shared, so the parent process also thinks that
				// the descriptors are closed (while they are actually not).
				// This leads to false positives due to missed synchronization.
				// Strictly saying this is undefined behavior, because vfork child is not
				// allowed to call any functions other than exec/exit. But this is what
				// openjdk does, so we want to handle it.
				// We could disable interceptors in the child process. But it's not possible
				// to simply intercept and wrap vfork, because vfork child is not allowed
				// to return from the function that calls vfork, and that's exactly what
				// we would do. So this would require some assembly trickery as well.
				// Instead we simply turn vfork into fork.
				return WRAP(fork)(fake);
				}

				#if !SANITIZER_MAC && !SANITIZER_ANDROID
				typedef int (dl_iterate_phdr_cb_t)(__sanitizer_dl_phdr_info info, SIZE_T size,
				void *data);
				struct dl_iterate_phdr_data {
				ThreadState *thr;
				uptr pc;
				dl_iterate_phdr_cb_t cb;
				void *data;
				};

				static bool IsAppNotRodata(uptr addr) {
				return IsAppMem(addr) && (u64)MemToShadow(addr) != kShadowRodata;
				}

				static int dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
				void *data) {
				dl_iterate_phdr_data cbdata = (dl_iterate_phdr_data )data;
				// dlopen/dlclose allocate/free dynamic-linker-internal memory, which is later
				// accessible in dl_iterate_phdr callback. But we don't see synchronization
				// inside of dynamic linker, so we "unpoison" it here in order to not
				// produce false reports. Ignoring malloc/free in dlopen/dlclose is not enough
				// because some libc functions call __libc_dlopen.
				if (info && IsAppNotRodata((uptr)info->dlpi_name))
				MemoryResetRange(cbdata->thr, cbdata->pc, (uptr)info->dlpi_name,
				internal_strlen(info->dlpi_name));
				int res = cbdata->cb(info, size, cbdata->data);
				// Perform the check one more time in case info->dlpi_name was overwritten
				// by user callback.
				if (info && IsAppNotRodata((uptr)info->dlpi_name))
				MemoryResetRange(cbdata->thr, cbdata->pc, (uptr)info->dlpi_name,
				internal_strlen(info->dlpi_name));
				return res;
				}

				TSAN_INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb_t cb, void *data) {
				SCOPED_TSAN_INTERCEPTOR(dl_iterate_phdr, cb, data);
				dl_iterate_phdr_data cbdata;
				cbdata.thr = thr;
				cbdata.pc = pc;
				cbdata.cb = cb;
				cbdata.data = data;
				int res = REAL(dl_iterate_phdr)(dl_iterate_phdr_cb, &cbdata);
				return res;
				}
				#endif

				static int OnExit(ThreadState *thr) {
				int status = Finalize(thr);
				FlushStreams();
				return status;
				}

				struct TsanInterceptorContext {
				ThreadState *thr;
				const uptr caller_pc;
				const uptr pc;
				};

				#if !SANITIZER_MAC
				static void HandleRecvmsg(ThreadState *thr, uptr pc,
				__sanitizer_msghdr *msg) {
				int fds[64];
				int cnt = ExtractRecvmsgFDs(msg, fds, ARRAY_SIZE(fds));
				for (int i = 0; i < cnt; i++)
				FdEventCreate(thr, pc, fds[i]);
				}
				#endif

				#include "sanitizer_common/sanitizer_platform_interceptors.h"
				// Causes interceptor recursion (getaddrinfo() and fopen())
				#undef SANITIZER_INTERCEPT_GETADDRINFO
				// We define our own.
				#if SANITIZER_INTERCEPT_TLS_GET_ADDR
				#define NEED_TLS_GET_ADDR
				#endif
				#undef SANITIZER_INTERCEPT_TLS_GET_ADDR
				#undef SANITIZER_INTERCEPT_PTHREAD_SIGMASK

				#define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
				#define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
				INTERCEPT_FUNCTION_VER(name, ver)

				#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
				MemoryAccessRange(((TsanInterceptorContext *)ctx)->thr, \
				((TsanInterceptorContext *)ctx)->pc, (uptr)ptr, size, \
				true)

				#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
				MemoryAccessRange(((TsanInterceptorContext *) ctx)->thr, \
				((TsanInterceptorContext *) ctx)->pc, (uptr) ptr, size, \
				false)

				#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
				SCOPED_TSAN_INTERCEPTOR(func, __VA_ARGS__); \
				TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
				ctx = (void *)&_ctx; \
				(void) ctx;

				#define COMMON_INTERCEPTOR_ENTER_NOIGNORE(ctx, func, ...) \
				SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
				TsanInterceptorContext _ctx = {thr, caller_pc, pc}; \
				ctx = (void *)&_ctx; \
				(void) ctx;

				#define COMMON_INTERCEPTOR_FILE_OPEN(ctx, file, path) \
				if (path) \
				Acquire(thr, pc, File2addr(path)); \
				if (file) { \
				int fd = fileno_unlocked(file); \
				if (fd >= 0) FdFileCreate(thr, pc, fd); \
				}

				#define COMMON_INTERCEPTOR_FILE_CLOSE(ctx, file) \
				if (file) { \
				int fd = fileno_unlocked(file); \
				if (fd >= 0) FdClose(thr, pc, fd); \
				}

				#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
				libignore()->OnLibraryLoaded(filename)

				#define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() \
				libignore()->OnLibraryUnloaded()

				#define COMMON_INTERCEPTOR_ACQUIRE(ctx, u) \
				Acquire(((TsanInterceptorContext *) ctx)->thr, pc, u)

				#define COMMON_INTERCEPTOR_RELEASE(ctx, u) \
				Release(((TsanInterceptorContext *) ctx)->thr, pc, u)

				#define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
				Acquire(((TsanInterceptorContext *) ctx)->thr, pc, Dir2addr(path))

				#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
				FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)

				#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
				FdRelease(((TsanInterceptorContext *) ctx)->thr, pc, fd)

				#define COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd) \
				FdAccess(((TsanInterceptorContext *) ctx)->thr, pc, fd)

				#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
				FdSocketAccept(((TsanInterceptorContext *) ctx)->thr, pc, fd, newfd)

				#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
				ThreadSetName(((TsanInterceptorContext *) ctx)->thr, name)

				#define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
				__tsan::ctx->thread_registry->SetThreadNameByUserId(thread, name)

				#define COMMON_INTERCEPTOR_BLOCK_REAL(name) BLOCK_REAL(name)

				#define COMMON_INTERCEPTOR_ON_EXIT(ctx) \
				OnExit(((TsanInterceptorContext *) ctx)->thr)

				#define COMMON_INTERCEPTOR_MUTEX_PRE_LOCK(ctx, m) \
				MutexPreLock(((TsanInterceptorContext *)ctx)->thr, \
				((TsanInterceptorContext *)ctx)->pc, (uptr)m)

				#define COMMON_INTERCEPTOR_MUTEX_POST_LOCK(ctx, m) \
				MutexPostLock(((TsanInterceptorContext *)ctx)->thr, \
				((TsanInterceptorContext *)ctx)->pc, (uptr)m)

				#define COMMON_INTERCEPTOR_MUTEX_UNLOCK(ctx, m) \
				MutexUnlock(((TsanInterceptorContext *)ctx)->thr, \
				((TsanInterceptorContext *)ctx)->pc, (uptr)m)

				#define COMMON_INTERCEPTOR_MUTEX_REPAIR(ctx, m) \
				MutexRepair(((TsanInterceptorContext *)ctx)->thr, \
				((TsanInterceptorContext *)ctx)->pc, (uptr)m)

				#define COMMON_INTERCEPTOR_MUTEX_INVALID(ctx, m) \
				MutexInvalidAccess(((TsanInterceptorContext *)ctx)->thr, \
				((TsanInterceptorContext *)ctx)->pc, (uptr)m)

				#define COMMON_INTERCEPTOR_MMAP_IMPL(ctx, mmap, addr, sz, prot, flags, fd, \
				off) \
				do { \
				return mmap_interceptor(thr, pc, REAL(mmap), addr, sz, prot, flags, fd, \
				off); \
				} while (false)

				#if !SANITIZER_MAC
				#define COMMON_INTERCEPTOR_HANDLE_RECVMSG(ctx, msg) \
				HandleRecvmsg(((TsanInterceptorContext *)ctx)->thr, \
				((TsanInterceptorContext *)ctx)->pc, msg)
				#endif

				#define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
				if (TsanThread *t = GetCurrentThread()) { \
				*begin = t->tls_begin(); \
				*end = t->tls_end(); \
				} else { \
				begin = end = 0; \
				}

				#define COMMON_INTERCEPTOR_USER_CALLBACK_START() \
				SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START()

				#define COMMON_INTERCEPTOR_USER_CALLBACK_END() \
				SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_END()

				#include "sanitizer_common/sanitizer_common_interceptors.inc"

				static int sigaction_impl(int sig, const __sanitizer_sigaction *act,
				__sanitizer_sigaction *old);
				static __sanitizer_sighandler_ptr signal_impl(int sig,
				__sanitizer_sighandler_ptr h);

				#define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signo, act, oldact) \
				{ return sigaction_impl(signo, act, oldact); }

				#define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signo, handler) \
				{ return (uptr)signal_impl(signo, (__sanitizer_sighandler_ptr)handler); }

				#include "sanitizer_common/sanitizer_signal_interceptors.inc"

				int sigaction_impl(int sig, const __sanitizer_sigaction *act,
				__sanitizer_sigaction *old) {
				// Note: if we call REAL(sigaction) directly for any reason without proxying
				// the signal handler through rtl_sigaction, very bad things will happen.
				// The handler will run synchronously and corrupt tsan per-thread state.
				SCOPED_INTERCEPTOR_RAW(sigaction, sig, act, old);
				__sanitizer_sigaction *sigactions = interceptor_ctx()->sigactions;
				__sanitizer_sigaction old_stored;
				if (old) internal_memcpy(&old_stored, &sigactions[sig], sizeof(old_stored));
				__sanitizer_sigaction newact;
				if (act) {
				// Copy act into sigactions[sig].
				// Can't use struct copy, because compiler can emit call to memcpy.
				// Can't use internal_memcpy, because it copies byte-by-byte,
				// and signal handler reads the handler concurrently. It it can read
				// some bytes from old value and some bytes from new value.
				// Use volatile to prevent insertion of memcpy.
				sigactions[sig].handler =
				(volatile __sanitizer_sighandler_ptr const )&act->handler;
				sigactions[sig].sa_flags = (volatile int const )&act->sa_flags;
				internal_memcpy(&sigactions[sig].sa_mask, &act->sa_mask,
				sizeof(sigactions[sig].sa_mask));
				#if !SANITIZER_FREEBSD && !SANITIZER_MAC && !SANITIZER_NETBSD
				sigactions[sig].sa_restorer = act->sa_restorer;
				#endif
				internal_memcpy(&newact, act, sizeof(newact));
				internal_sigfillset(&newact.sa_mask);
				if ((uptr)act->handler != sig_ign && (uptr)act->handler != sig_dfl) {
				if (newact.sa_flags & SA_SIGINFO)
				newact.sigaction = rtl_sigaction;
				else
				newact.handler = rtl_sighandler;
				}
				ReleaseStore(thr, pc, (uptr)&sigactions[sig]);
				act = &newact;
				}
				int res = REAL(sigaction)(sig, act, old);
				if (res == 0 && old) {
				uptr cb = (uptr)old->sigaction;
				if (cb == (uptr)rtl_sigaction \|\| cb == (uptr)rtl_sighandler) {
				internal_memcpy(old, &old_stored, sizeof(*old));
				}
				}
				return res;
				}

				static __sanitizer_sighandler_ptr signal_impl(int sig,
				__sanitizer_sighandler_ptr h) {
				__sanitizer_sigaction act;
				act.handler = h;
				internal_memset(&act.sa_mask, -1, sizeof(act.sa_mask));
				act.sa_flags = 0;
				__sanitizer_sigaction old;
				int res = sigaction_symname(sig, &act, &old);
				if (res) return (__sanitizer_sighandler_ptr)sig_err;
				return old.handler;
				}

				#define TSAN_SYSCALL() \
				ThreadState *thr = cur_thread(); \
				if (thr->ignore_interceptors) \
				return; \
				ScopedSyscall scoped_syscall(thr) \
				/**/

				struct ScopedSyscall {
				ThreadState *thr;

				explicit ScopedSyscall(ThreadState *thr)
				: thr(thr) {
				Initialize(thr);
				}

				~ScopedSyscall() {
				ProcessPendingSignals(thr);
				}
				};

				#if !SANITIZER_FREEBSD && !SANITIZER_MAC
				static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
				TSAN_SYSCALL();
				MemoryAccessRange(thr, pc, p, s, write);
				}

				static void syscall_acquire(uptr pc, uptr addr) {
				TSAN_SYSCALL();
				Acquire(thr, pc, addr);
				DPrintf("syscall_acquire(%p)\n", addr);
				}

				static void syscall_release(uptr pc, uptr addr) {
				TSAN_SYSCALL();
				DPrintf("syscall_release(%p)\n", addr);
				Release(thr, pc, addr);
				}

				static void syscall_fd_close(uptr pc, int fd) {
				TSAN_SYSCALL();
				FdClose(thr, pc, fd);
				}

				static USED void syscall_fd_acquire(uptr pc, int fd) {
				TSAN_SYSCALL();
				FdAcquire(thr, pc, fd);
				DPrintf("syscall_fd_acquire(%p)\n", fd);
				}

				static USED void syscall_fd_release(uptr pc, int fd) {
				TSAN_SYSCALL();
				DPrintf("syscall_fd_release(%p)\n", fd);
				FdRelease(thr, pc, fd);
				}

				static void syscall_pre_fork(uptr pc) {
				TSAN_SYSCALL();
				ForkBefore(thr, pc);
				}

				static void syscall_post_fork(uptr pc, int pid) {
				TSAN_SYSCALL();
				if (pid == 0) {
				// child
				ForkChildAfter(thr, pc);
				FdOnFork(thr, pc);
				} else if (pid > 0) {
				// parent
				ForkParentAfter(thr, pc);
				} else {
				// error
				ForkParentAfter(thr, pc);
				}
				}
				#endif

				#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
				syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)

				#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
				syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)

				#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
				do { \
				(void)(p); \
				(void)(s); \
				} while (false)

				#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \
				do { \
				(void)(p); \
				(void)(s); \
				} while (false)

				#define COMMON_SYSCALL_ACQUIRE(addr) \
				syscall_acquire(GET_CALLER_PC(), (uptr)(addr))

				#define COMMON_SYSCALL_RELEASE(addr) \
				syscall_release(GET_CALLER_PC(), (uptr)(addr))

				#define COMMON_SYSCALL_FD_CLOSE(fd) syscall_fd_close(GET_CALLER_PC(), fd)

				#define COMMON_SYSCALL_FD_ACQUIRE(fd) syscall_fd_acquire(GET_CALLER_PC(), fd)

				#define COMMON_SYSCALL_FD_RELEASE(fd) syscall_fd_release(GET_CALLER_PC(), fd)

				#define COMMON_SYSCALL_PRE_FORK() \
				syscall_pre_fork(GET_CALLER_PC())

				#define COMMON_SYSCALL_POST_FORK(res) \
				syscall_post_fork(GET_CALLER_PC(), res)

				#include "sanitizer_common/sanitizer_common_syscalls.inc"
				#include "sanitizer_common/sanitizer_syscalls_netbsd.inc"

				#ifdef NEED_TLS_GET_ADDR
				// Define own interceptor instead of sanitizer_common's for three reasons:
				// 1. It must not process pending signals.
				// Signal handlers may contain MOVDQA instruction (see below).
				// 2. It must be as simple as possible to not contain MOVDQA.
				// 3. Sanitizer_common version uses COMMON_INTERCEPTOR_INITIALIZE_RANGE which
				// is empty for tsan (meant only for msan).
				// Note: __tls_get_addr can be called with mis-aligned stack due to:
				// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
				// So the interceptor must work with mis-aligned stack, in particular, does not
				// execute MOVDQA with stack addresses.
				TSAN_INTERCEPTOR(void , __tls_get_addr, void arg) {
				void *res = REAL(__tls_get_addr)(arg);
				ThreadState *thr = cur_thread();
				if (!thr)
				return res;
				DTLS::DTV *dtv = DTLS_on_tls_get_addr(arg, res, thr->tls_addr,
				thr->tls_addr + thr->tls_size);
				if (!dtv)
				return res;
				// New DTLS block has been allocated.
				MemoryResetRange(thr, 0, dtv->beg, dtv->size);
				return res;
				}
				#endif

				#if SANITIZER_NETBSD
				TSAN_INTERCEPTOR(void, _lwp_exit) {
				SCOPED_TSAN_INTERCEPTOR(_lwp_exit);
				DestroyThreadState();
				REAL(_lwp_exit)();
				}
				#define TSAN_MAYBE_INTERCEPT__LWP_EXIT TSAN_INTERCEPT(_lwp_exit)
				#else
				#define TSAN_MAYBE_INTERCEPT__LWP_EXIT
				#endif

				#if SANITIZER_FREEBSD
				TSAN_INTERCEPTOR(void, thr_exit, tid_t *state) {
				SCOPED_TSAN_INTERCEPTOR(thr_exit, state);
				DestroyThreadState();
				REAL(thr_exit(state));
				}
				#define TSAN_MAYBE_INTERCEPT_THR_EXIT TSAN_INTERCEPT(thr_exit)
				#else
				#define TSAN_MAYBE_INTERCEPT_THR_EXIT
				#endif

				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_init, void c, void a)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_signal, void *c)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_broadcast, void *c)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_wait, void c, void m)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, cond_destroy, void *c)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_init, void m, void a)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_destroy, void *m)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, mutex_trylock, void *m)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_init, void m, void a)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_destroy, void *m)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_rdlock, void *m)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_tryrdlock, void *m)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_wrlock, void *m)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_trywrlock, void *m)
				TSAN_INTERCEPTOR_NETBSD_ALIAS(int, rwlock_unlock, void *m)
				TSAN_INTERCEPTOR_NETBSD_ALIAS_THR(int, once, void o, void (f)())
				TSAN_INTERCEPTOR_NETBSD_ALIAS_THR2(int, sigsetmask, sigmask, int a, void *b,
				void *c)

				namespace __tsan {

				static void finalize(void *arg) {
				ThreadState *thr = cur_thread();
				int status = Finalize(thr);
				// Make sure the output is not lost.
				FlushStreams();
				if (status)
				Die();
				}

				#if !SANITIZER_MAC && !SANITIZER_ANDROID
				static void unreachable() {
				Report("FATAL: ThreadSanitizer: unreachable called\n");
				Die();
				}
				#endif

				// Define default implementation since interception of libdispatch is optional.
				SANITIZER_WEAK_ATTRIBUTE void InitializeLibdispatchInterceptors() {}

				void InitializeInterceptors() {
				#if !SANITIZER_MAC
				// We need to setup it early, because functions like dlsym() can call it.
				REAL(memset) = internal_memset;
				REAL(memcpy) = internal_memcpy;
				#endif

				// Instruct libc malloc to consume less memory.
				#if SANITIZER_LINUX
				mallopt(1, 0); // M_MXFAST
				mallopt(-3, 32*1024); // M_MMAP_THRESHOLD
				#endif

				new(interceptor_ctx()) InterceptorContext();

				InitializeCommonInterceptors();
				InitializeSignalInterceptors();
				InitializeLibdispatchInterceptors();

				#if !SANITIZER_MAC
				// We can not use TSAN_INTERCEPT to get setjmp addr,
				// because it does &setjmp and setjmp is not present in some versions of libc.
				using __interception::InterceptFunction;
				InterceptFunction(TSAN_STRING_SETJMP, (uptr*)&REAL(setjmp_symname), 0, 0);
				InterceptFunction("_setjmp", (uptr*)&REAL(_setjmp), 0, 0);
				InterceptFunction(TSAN_STRING_SIGSETJMP, (uptr*)&REAL(sigsetjmp_symname), 0,
				0);
				#if !SANITIZER_NETBSD
				InterceptFunction("__sigsetjmp", (uptr*)&REAL(__sigsetjmp), 0, 0);
				#endif
				#endif

				TSAN_INTERCEPT(longjmp_symname);
				TSAN_INTERCEPT(siglongjmp_symname);
				#if SANITIZER_NETBSD
				TSAN_INTERCEPT(_longjmp);
				#endif

				TSAN_INTERCEPT(malloc);
				TSAN_INTERCEPT(__libc_memalign);
				TSAN_INTERCEPT(calloc);
				TSAN_INTERCEPT(realloc);
				TSAN_INTERCEPT(reallocarray);
				TSAN_INTERCEPT(free);
				TSAN_INTERCEPT(cfree);
				TSAN_INTERCEPT(munmap);
				TSAN_MAYBE_INTERCEPT_MEMALIGN;
				TSAN_INTERCEPT(valloc);
				TSAN_MAYBE_INTERCEPT_PVALLOC;
				TSAN_INTERCEPT(posix_memalign);

				TSAN_INTERCEPT(strcpy);
				TSAN_INTERCEPT(strncpy);
				TSAN_INTERCEPT(strdup);

				TSAN_INTERCEPT(pthread_create);
				TSAN_INTERCEPT(pthread_join);
				TSAN_INTERCEPT(pthread_detach);
				TSAN_INTERCEPT(pthread_exit);
				#if SANITIZER_LINUX
				TSAN_INTERCEPT(pthread_tryjoin_np);
				TSAN_INTERCEPT(pthread_timedjoin_np);
				#endif

				TSAN_INTERCEPT_VER(pthread_cond_init, PTHREAD_ABI_BASE);
				TSAN_INTERCEPT_VER(pthread_cond_signal, PTHREAD_ABI_BASE);
				TSAN_INTERCEPT_VER(pthread_cond_broadcast, PTHREAD_ABI_BASE);
				TSAN_INTERCEPT_VER(pthread_cond_wait, PTHREAD_ABI_BASE);
				TSAN_INTERCEPT_VER(pthread_cond_timedwait, PTHREAD_ABI_BASE);
				TSAN_INTERCEPT_VER(pthread_cond_destroy, PTHREAD_ABI_BASE);

				TSAN_INTERCEPT(pthread_mutex_init);
				TSAN_INTERCEPT(pthread_mutex_destroy);
				TSAN_INTERCEPT(pthread_mutex_trylock);
				TSAN_INTERCEPT(pthread_mutex_timedlock);

				TSAN_INTERCEPT(pthread_spin_init);
				TSAN_INTERCEPT(pthread_spin_destroy);
				TSAN_INTERCEPT(pthread_spin_lock);
				TSAN_INTERCEPT(pthread_spin_trylock);
				TSAN_INTERCEPT(pthread_spin_unlock);

				TSAN_INTERCEPT(pthread_rwlock_init);
				TSAN_INTERCEPT(pthread_rwlock_destroy);
				TSAN_INTERCEPT(pthread_rwlock_rdlock);
				TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
				TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
				TSAN_INTERCEPT(pthread_rwlock_wrlock);
				TSAN_INTERCEPT(pthread_rwlock_trywrlock);
				TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
				TSAN_INTERCEPT(pthread_rwlock_unlock);

				TSAN_INTERCEPT(pthread_barrier_init);
				TSAN_INTERCEPT(pthread_barrier_destroy);
				TSAN_INTERCEPT(pthread_barrier_wait);

				TSAN_INTERCEPT(pthread_once);

				TSAN_INTERCEPT(fstat);
				TSAN_MAYBE_INTERCEPT___FXSTAT;
				TSAN_MAYBE_INTERCEPT_FSTAT64;
				TSAN_MAYBE_INTERCEPT___FXSTAT64;
				TSAN_INTERCEPT(open);
				TSAN_MAYBE_INTERCEPT_OPEN64;
				TSAN_INTERCEPT(creat);
				TSAN_MAYBE_INTERCEPT_CREAT64;
				TSAN_INTERCEPT(dup);
				TSAN_INTERCEPT(dup2);
				TSAN_INTERCEPT(dup3);
				TSAN_MAYBE_INTERCEPT_EVENTFD;
				TSAN_MAYBE_INTERCEPT_SIGNALFD;
				TSAN_MAYBE_INTERCEPT_INOTIFY_INIT;
				TSAN_MAYBE_INTERCEPT_INOTIFY_INIT1;
				TSAN_INTERCEPT(socket);
				TSAN_INTERCEPT(socketpair);
				TSAN_INTERCEPT(connect);
				TSAN_INTERCEPT(bind);
				TSAN_INTERCEPT(listen);
				TSAN_MAYBE_INTERCEPT_EPOLL;
				TSAN_INTERCEPT(close);
				TSAN_MAYBE_INTERCEPT___CLOSE;
				TSAN_MAYBE_INTERCEPT___RES_ICLOSE;
				TSAN_INTERCEPT(pipe);
				TSAN_INTERCEPT(pipe2);

				TSAN_INTERCEPT(unlink);
				TSAN_INTERCEPT(tmpfile);
				TSAN_MAYBE_INTERCEPT_TMPFILE64;
				TSAN_INTERCEPT(abort);
				TSAN_INTERCEPT(rmdir);
				TSAN_INTERCEPT(closedir);

				TSAN_INTERCEPT(sigsuspend);
				TSAN_INTERCEPT(sigblock);
				TSAN_INTERCEPT(sigsetmask);
				TSAN_INTERCEPT(pthread_sigmask);
				TSAN_INTERCEPT(raise);
				TSAN_INTERCEPT(kill);
				TSAN_INTERCEPT(pthread_kill);
				TSAN_INTERCEPT(sleep);
				TSAN_INTERCEPT(usleep);
				TSAN_INTERCEPT(nanosleep);
				TSAN_INTERCEPT(pause);
				TSAN_INTERCEPT(gettimeofday);
				TSAN_INTERCEPT(getaddrinfo);

				TSAN_INTERCEPT(fork);
				TSAN_INTERCEPT(vfork);
				#if !SANITIZER_ANDROID
				TSAN_INTERCEPT(dl_iterate_phdr);
				#endif
				TSAN_MAYBE_INTERCEPT_ON_EXIT;
				TSAN_INTERCEPT(__cxa_atexit);
				TSAN_INTERCEPT(_exit);

				#ifdef NEED_TLS_GET_ADDR
				TSAN_INTERCEPT(__tls_get_addr);
				#endif

				TSAN_MAYBE_INTERCEPT__LWP_EXIT;
				TSAN_MAYBE_INTERCEPT_THR_EXIT;

				#if !SANITIZER_MAC && !SANITIZER_ANDROID
				// Need to setup it, because interceptors check that the function is resolved.
				// But atexit is emitted directly into the module, so can't be resolved.
				REAL(atexit) = (int()(void()()))unreachable;
				#endif

				if (REAL(__cxa_atexit)(&finalize, 0, 0)) {
				Printf("ThreadSanitizer: failed to setup atexit callback\n");
				Die();
				}

				#if !SANITIZER_MAC && !SANITIZER_NETBSD && !SANITIZER_FREEBSD
				if (pthread_key_create(&interceptor_ctx()->finalize_key, &thread_finalize)) {
				Printf("ThreadSanitizer: failed to create thread key\n");
				Die();
				}
				#endif

				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_init);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_signal);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_broadcast);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_wait);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(cond_destroy);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_init);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_destroy);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(mutex_trylock);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_init);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_destroy);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_rdlock);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_tryrdlock);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_wrlock);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_trywrlock);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS(rwlock_unlock);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(once);
				TSAN_MAYBE_INTERCEPT_NETBSD_ALIAS_THR(sigsetmask);

				FdInit();
				}

				} // namespace __tsan

				// Invisible barrier for tests.
				// There were several unsuccessful iterations for this functionality:
				// 1. Initially it was implemented in user code using
				// REAL(pthread_barrier_wait). But pthread_barrier_wait is not supported on
				// MacOS. Futexes are linux-specific for this matter.
				// 2. Then we switched to atomics+usleep(10). But usleep produced parasitic
				// "as-if synchronized via sleep" messages in reports which failed some
				// output tests.
				// 3. Then we switched to atomics+sched_yield. But this produced tons of tsan-
				// visible events, which lead to "failed to restore stack trace" failures.
				// Note that no_sanitize_thread attribute does not turn off atomic interception
				// so attaching it to the function defined in user code does not help.
				// That's why we now have what we have.
				extern "C" SANITIZER_INTERFACE_ATTRIBUTE
				void __tsan_testonly_barrier_init(u64 *barrier, u32 count) {
				if (count >= (1 << 8)) {
				Printf("barrier_init: count is too large (%d)\n", count);
				Die();
				}
				// 8 lsb is thread count, the remaining are count of entered threads.
				*barrier = count;
				}

				extern "C" SANITIZER_INTERFACE_ATTRIBUTE
				void __tsan_testonly_barrier_wait(u64 *barrier) {
				unsigned old = __atomic_fetch_add(barrier, 1 << 8, __ATOMIC_RELAXED);
				unsigned old_epoch = (old >> 8) / (old & 0xff);
				for (;;) {
				unsigned cur = __atomic_load_n(barrier, __ATOMIC_RELAXED);
				unsigned cur_epoch = (cur >> 8) / (cur & 0xff);
				if (cur_epoch != old_epoch)
				return;
				internal_sched_yield();
				}
				}

compiler-rt/trunk/lib/tsan/rtl/tsan_report.cpp

	Show First 20 Lines • Show All 292 Lines • ▼ Show 20 Lines
	}			}

	static bool FrameIsInternal(const SymbolizedStack *frame) {			static bool FrameIsInternal(const SymbolizedStack *frame) {
	if (frame == 0)			if (frame == 0)
	return false;			return false;
	const char *file = frame->info.file;			const char *file = frame->info.file;
	const char *module = frame->info.module;			const char *module = frame->info.module;
	if (file != 0 &&			if (file != 0 &&
	(internal_strstr(file, "tsan_interceptors.cpp") \|\|			(internal_strstr(file, "tsan_interceptors_posix.cpp") \|\|
	internal_strstr(file, "sanitizer_common_interceptors.inc") \|\|			internal_strstr(file, "sanitizer_common_interceptors.inc") \|\|
	internal_strstr(file, "tsan_interface_")))			internal_strstr(file, "tsan_interface_")))
	return true;			return true;
	if (module != 0 && (internal_strstr(module, "libclang_rt.tsan_")))			if (module != 0 && (internal_strstr(module, "libclang_rt.tsan_")))
	return true;			return true;
	return false;			return false;
	}			}

	▲ Show 20 Lines • Show All 177 Lines • Show Last 20 Lines