[OPENMP] Add Hurd support

[sthibaul]

Summary

This adds Hurd support to the openmp runtime by just enabling appropriate code pieces.

[AndreyChurbanov]

Please submit the patch with full sources, so that more code around changes could be easily viewed.

[sthibaul]

Here it is

[krytarowski]

runtime/src/z_Linux_util.cpp

1957

I would update this 'Linux' in comment and make it more generic.

[krytarowski]

runtime/src/z_Linux_util.cpp

447

I would drop this comment.

[sthibaul]

(I cannot commit this myself)

runtime/src/kmp.h

 #elif KMP_OS_FREEBSD
 /* TODO: tune for KMP_OS_FREEBSD */
 #define KMP_INIT_WAIT 1024U /* initial number of spin-tests   */
 #define KMP_NEXT_WAIT 512U /* susequent number of spin-tests */
 #elif KMP_OS_NETBSD
 /* TODO: tune for KMP_OS_NETBSD */
 #define KMP_INIT_WAIT 1024U /* initial number of spin-tests   */
 #define KMP_NEXT_WAIT 512U /* susequent number of spin-tests */
+#elif KMP_OS_HURD
+/* TODO: tune for KMP_OS_HURD */
+#define KMP_INIT_WAIT 1024U /* initial number of spin-tests   */
+#define KMP_NEXT_WAIT 512U /* susequent number of spin-tests */
 #endif
 
 #if KMP_ARCH_X86 || KMP_ARCH_X86_64
 typedef struct kmp_cpuid {
   kmp_uint32 eax;
   kmp_uint32 ebx;
   kmp_uint32 ecx;
   kmp_uint32 edx;

runtime/src/kmp_ftn_entry.h

 #endif /* OMP_50_ENABLED */
 
 int FTN_STDCALL KMP_EXPAND_NAME(FTN_GET_THREAD_NUM)(void) {
 #ifdef KMP_STUB
   return 0;
 #else
   int gtid;
 
-#if KMP_OS_DARWIN || KMP_OS_FREEBSD || KMP_OS_NETBSD
+#if KMP_OS_DARWIN || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_HURD
   gtid = __kmp_entry_gtid();
 #elif KMP_OS_WINDOWS
   if (!__kmp_init_parallel ||
       (gtid = (int)((kmp_intptr_t)TlsGetValue(__kmp_gtid_threadprivate_key))) ==
           0) {
     // Either library isn't initialized or thread is not registered
     // 0 is the correct TID in this case
     return 0;

runtime/src/kmp_platform.h

 /* ---------------------- Operating system recognition ------------------- */
 
 #define KMP_OS_LINUX 0
 #define KMP_OS_FREEBSD 0
 #define KMP_OS_NETBSD 0
 #define KMP_OS_DARWIN 0
 #define KMP_OS_WINDOWS 0
 #define KMP_OS_CNK 0
+#define KMP_OS_HURD 0
 #define KMP_OS_UNIX 0 /* disjunction of KMP_OS_LINUX, KMP_OS_DARWIN etc. */
 
 #ifdef _WIN32
 #undef KMP_OS_WINDOWS
 #define KMP_OS_WINDOWS 1
 #endif
 
 #if (defined __APPLE__ && defined __MACH__)

 #define KMP_OS_NETBSD 1
 #endif
 
 #if (defined __bgq__)
 #undef KMP_OS_CNK
 #define KMP_OS_CNK 1
 #endif
 
+#if (defined __GNU__)
+#undef KMP_OS_HURD
+#define KMP_OS_HURD 1
+#endif
+
 #if (1 !=                                                                      \
      KMP_OS_LINUX + KMP_OS_FREEBSD + KMP_OS_NETBSD + KMP_OS_DARWIN +           \
-         KMP_OS_WINDOWS)
+         KMP_OS_WINDOWS + KMP_OS_HURD)
 #error Unknown OS
 #endif
 
-#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_DARWIN
+#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_DARWIN || KMP_OS_HURD
 #undef KMP_OS_UNIX
 #define KMP_OS_UNIX 1
 #endif
 
 /* ---------------------- Architecture recognition ------------------- */
 
 #define KMP_ARCH_X86 0
 #define KMP_ARCH_X86_64 0

runtime/src/kmp_runtime.cpp

#define FAST_REDUCTION_TREE_METHOD_GENERATED ((reduce_data) && (reduce_func))
 
   } else {
 
     int atomic_available = FAST_REDUCTION_ATOMIC_METHOD_GENERATED;
 
 #if KMP_ARCH_X86_64 || KMP_ARCH_PPC64 || KMP_ARCH_AARCH64 || KMP_ARCH_MIPS64
 
 #if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_WINDOWS ||       \
-    KMP_OS_DARWIN
+    KMP_OS_DARWIN || KMP_OS_HURD
 
     int teamsize_cutoff = 4;
 
 #if KMP_MIC_SUPPORTED
     if (__kmp_mic_type != non_mic) {
       teamsize_cutoff = 8;
     }
 #endif
#endif
     }
 #else
 #error "Unknown or unsupported OS"
 #endif // KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_WINDOWS ||
 // KMP_OS_DARWIN
 
 #elif KMP_ARCH_X86 || KMP_ARCH_ARM || KMP_ARCH_AARCH || KMP_ARCH_MIPS
 
-#if KMP_OS_LINUX || KMP_OS_WINDOWS
+#if KMP_OS_LINUX || KMP_OS_WINDOWS || KMP_OS_HURD
 
     // basic tuning
 
     if (atomic_available) {
       if (num_vars <= 2) { // && ( team_size <= 8 ) due to false-sharing ???
         retval = atomic_reduce_block;
       }
     } // otherwise: use critical section

runtime/src/thirdparty/ittnotify/ittnotify_static.c

 #if ITT_ARCH==ITT_ARCH_IA32 || ITT_ARCH==ITT_ARCH_ARM
 #define ANDROID_ITTNOTIFY_DEFAULT_PATH  ANDROID_ITTNOTIFY_DEFAULT_PATH_MASK(32)
 #else
 #define ANDROID_ITTNOTIFY_DEFAULT_PATH  ANDROID_ITTNOTIFY_DEFAULT_PATH_MASK(64)
 #endif
 
 #endif
 
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
 
 #ifndef LIB_VAR_NAME
 #if ITT_ARCH==ITT_ARCH_IA32 || ITT_ARCH==ITT_ARCH_ARM || ITT_ARCH==ITT_ARCH_MIPS
 #define LIB_VAR_NAME INTEL_LIBITTNOTIFY32
 #else
 #define LIB_VAR_NAME INTEL_LIBITTNOTIFY64
 #endif
 #endif /* LIB_VAR_NAME */

runtime/src/z_Linux_util.cpp

 } //
 
 /* Set thread stack info according to values returned by pthread_getattr_np().
    If values are unreasonable, assume call failed and use incremental stack
    refinement method instead. Returns TRUE if the stack parameters could be
    determined exactly, FALSE if incremental refinement is necessary. */
 static kmp_int32 __kmp_set_stack_info(int gtid, kmp_info_t *th) {
   int stack_data;
-#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD
-  /* Linux* OS only -- no pthread_getattr_np support on OS X* */
+#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_HURD
   pthread_attr_t attr;
   int status;
   size_t size = 0;
   void *addr = 0;
 
   /* Always do incremental stack refinement for ubermaster threads since the
      initial thread stack range can be reduced by sibling thread creation so
      pthread_attr_getstack may cause thread gtid aliasing */

 }
 
 static void *__kmp_launch_worker(void *thr) {
   int status, old_type, old_state;
 #ifdef KMP_BLOCK_SIGNALS
   sigset_t new_set, old_set;
 #endif /* KMP_BLOCK_SIGNALS */
   void *exit_val;
-#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD
+#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_HURD
   void *volatile padding = 0;
 #endif
   int gtid;
 
   gtid = ((kmp_info_t *)thr)->th.th_info.ds.ds_gtid;
   __kmp_gtid_set_specific(gtid);
 #ifdef KMP_TDATA_GTID
   __kmp_gtid = gtid;
void __kmp_clear_system_time(void) {
   KMP_CHECK_SYSFAIL_ERRNO("gettimeofday", status);
   TIMEVAL_TO_TIMESPEC(&tval, &__kmp_sys_timer_data.start);
 }
 
 static int __kmp_get_xproc(void) {
 
   int r = 0;
 
-#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD
+#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_HURD
 
   r = sysconf(_SC_NPROCESSORS_ONLN);
 
 #elif KMP_OS_DARWIN
 
   // Bug C77011 High "OpenMP Threads and number of active cores".
 
   // Find the number of available CPUs.

 /* Determine whether the given address is mapped into the current address
    space. */
 
 int __kmp_is_address_mapped(void *addr) {
 
   int found = 0;
   int rc;
 
-#if KMP_OS_LINUX || KMP_OS_FREEBSD
+#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_HURD
 
-  /* On Linux* OS, read the /proc/<pid>/maps pseudo-file to get all the address
+  /* On GNUish OSes, read the /proc/<pid>/maps pseudo-file to get all the address
      ranges mapped into the address space. */
 
   char *name = __kmp_str_format("/proc/%d/maps", getpid());
   FILE *file = NULL;
 
   file = fopen(name, "r");
   KMP_ASSERT(file != NULL);