gcc/gthr-posix.h

   1 /* Threads compatibility routines for libgcc2.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* As a special exception, if you link this library with other files,
  23    some of which are compiled with GCC, to produce an executable,
  24    this library does not by itself cause the resulting executable
  25    to be covered by the GNU General Public License.
  26    This exception does not however invalidate any other reasons why
  27    the executable file might be covered by the GNU General Public License.  */
  28
  29 #ifndef __gthr_posix_h
  30 #define __gthr_posix_h
  31
  32 /* POSIX threads specific definitions.
  33    Easy, since the interface is just one-to-one mapping. */
  34
  35 #define __GTHREADS 1
  36
  37 #include <pthread.h>
  38
  39 typedef pthread_key_t __gthread_key_t;
  40 typedef pthread_once_t __gthread_once_t;
  41 typedef pthread_mutex_t __gthread_mutex_t;
  42
  43 #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
  44 #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
  45
  46 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
  47
  48 #pragma weak pthread_once
  49 #pragma weak pthread_key_create
  50 #pragma weak pthread_key_delete
  51 #pragma weak pthread_getspecific
  52 #pragma weak pthread_setspecific
  53 #pragma weak pthread_create
  54
  55 #pragma weak pthread_mutex_lock
  56 #pragma weak pthread_mutex_trylock
  57 #pragma weak pthread_mutex_unlock
  58
  59 static void *__gthread_active_ptr = &pthread_create;
  60
  61 static inline int
  62 __gthread_active_p (void)
  63 {
  64   return __gthread_active_ptr != 0;
  65 }
  66
  67 #else /* not SUPPORTS_WEAK */
  68
  69 static inline int
  70 __gthread_active_p (void)
  71 {
  72   return 1;
  73 }
  74
  75 #endif /* SUPPORTS_WEAK */
  76
  77 static inline int
  78 __gthread_once (__gthread_once_t *once, void (*func) (void))
  79 {
  80   if (__gthread_active_p ())
  81     return pthread_once (once, func);
  82   else
  83     return -1;
  84 }
  85
  86 static inline int
  87 __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
  88 {
  89   return pthread_key_create (key, dtor);
  90 }
  91
  92 static inline int
  93 __gthread_key_dtor (__gthread_key_t key, void *ptr)
  94 {
  95   /* Just reset the key value to zero. */
  96   if (ptr)
  97     return pthread_setspecific (key, 0);
  98   else
  99     return 0;
 100 }
 101
 102 static inline int
 103 __gthread_key_delete (__gthread_key_t key)
 104 {
 105   return pthread_key_delete (key);
 106 }
 107
 108 static inline void *
 109 __gthread_getspecific (__gthread_key_t key)
 110 {
 111   return pthread_getspecific (key);
 112 }
 113
 114 static inline int
 115 __gthread_setspecific (__gthread_key_t key, const void *ptr)
 116 {
 117   return pthread_setspecific (key, ptr);
 118 }
 119
 120 static inline int
 121 __gthread_mutex_lock (__gthread_mutex_t *mutex)
 122 {
 123   if (__gthread_active_p ())
 124     return pthread_mutex_lock (mutex);
 125   else
 126     return 0;
 127 }
 128
 129 static inline int
 130 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
 131 {
 132   if (__gthread_active_p ())
 133     return pthread_mutex_trylock (mutex);
 134   else
 135     return 0;
 136 }
 137
 138 static inline int
 139 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
 140 {
 141   if (__gthread_active_p ())
 142     return pthread_mutex_unlock (mutex);
 143   else
 144     return 0;
 145 }
 146
 147 #endif /* not __gthr_posix_h */