Differential D4033 Diff 10143 lib/Support/Threading.cpp

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lib/Support/Threading.cpp

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	#include "llvm/Support/Atomic.h"			#include "llvm/Support/Atomic.h"
	#include "llvm/Support/Mutex.h"			#include "llvm/Support/Mutex.h"
	#include <cassert>			#include <cassert>

	using namespace llvm;			using namespace llvm;

	static bool multithreaded_mode = false;			static bool multithreaded_mode = false;

	static sys::Mutex* global_lock = nullptr;			static sys::RecursiveMutex* global_lock = nullptr;

	bool llvm::llvm_start_multithreaded() {			bool llvm::llvm_start_multithreaded() {
	#if LLVM_ENABLE_THREADS != 0			#if LLVM_ENABLE_THREADS != 0
	assert(!multithreaded_mode && "Already multithreaded!");			assert(!multithreaded_mode && "Already multithreaded!");
	multithreaded_mode = true;			multithreaded_mode = true;
	global_lock = new sys::Mutex(true);			global_lock = new sys::RecursiveMutex;

	// We fence here to ensure that all initialization is complete BEFORE we			// We fence here to ensure that all initialization is complete BEFORE we
	// return from llvm_start_multithreaded().			// return from llvm_start_multithreaded().
	sys::MemoryFence();			sys::MemoryFence();
	return true;			return true;
	#else			#else
	return false;			return false;
	#endif			#endif
	}			}

	void llvm::llvm_stop_multithreaded() {			void llvm::llvm_stop_multithreaded() {
	#if LLVM_ENABLE_THREADS != 0			#if LLVM_ENABLE_THREADS != 0
	assert(multithreaded_mode && "Not currently multithreaded!");			assert(multithreaded_mode && "Not currently multithreaded!");

	// We fence here to insure that all threaded operations are complete BEFORE we			// We fence here to insure that all threaded operations are complete BEFORE we
	// return from llvm_stop_multithreaded().			// return from llvm_stop_multithreaded().
	sys::MemoryFence();			sys::MemoryFence();

	multithreaded_mode = false;			multithreaded_mode = false;
	delete global_lock;			delete global_lock;
				global_lock = nullptr;
	#endif			#endif
	}			}

	bool llvm::llvm_is_multithreaded() {			bool llvm::llvm_is_multithreaded() {
	return multithreaded_mode;			return multithreaded_mode;
	}			}

	void llvm::llvm_acquire_global_lock() {			void llvm::llvm_acquire_global_lock() {
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