gcc/gthr.h

   1 /* Threads compatibility routines for libgcc2.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997, 1998, 2004 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 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 GCC_GTHR_H
  30 #define GCC_GTHR_H
  31
  32 #ifndef HIDE_EXPORTS
  33 #pragma GCC visibility push(default)
  34 #endif
  35
  36 /* If this file is compiled with threads support, it must
  37        #define __GTHREADS 1
  38    to indicate that threads support is present.  Also it has define
  39    function
  40      int __gthread_active_p ()
  41    that returns 1 if thread system is active, 0 if not.
  42
  43    The threads interface must define the following types:
  44      __gthread_key_t
  45      __gthread_once_t
  46      __gthread_mutex_t
  47      __gthread_recursive_mutex_t
  48
  49    The threads interface must define the following macros:
  50
  51      __GTHREAD_ONCE_INIT
  52                 to initialize __gthread_once_t
  53      __GTHREAD_MUTEX_INIT
  54                 to initialize __gthread_mutex_t to get a fast
  55                 non-recursive mutex.
  56      __GTHREAD_MUTEX_INIT_FUNCTION
  57                 some systems can't initialize a mutex without a
  58                 function call.  On such systems, define this to a
  59                 function which looks like this:
  60                   void __GTHREAD_MUTEX_INIT_FUNCTION (__gthread_mutex_t *)
  61                 Don't define __GTHREAD_MUTEX_INIT in this case
  62      __GTHREAD_RECURSIVE_MUTEX_INIT
  63      __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION
  64                 as above, but for a recursive mutex.
  65
  66    The threads interface must define the following static functions:
  67
  68      int __gthread_once (__gthread_once_t *once, void (*func) ())
  69
  70      int __gthread_key_create (__gthread_key_t *keyp, void (*dtor) (void *))
  71      int __gthread_key_delete (__gthread_key_t key)
  72
  73      void *__gthread_getspecific (__gthread_key_t key)
  74      int __gthread_setspecific (__gthread_key_t key, const void *ptr)
  75
  76      int __gthread_mutex_lock (__gthread_mutex_t *mutex);
  77      int __gthread_mutex_trylock (__gthread_mutex_t *mutex);
  78      int __gthread_mutex_unlock (__gthread_mutex_t *mutex);
  79
  80      int __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex);
  81      int __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex);
  82      int __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex);
  83
  84    All functions returning int should return zero on success or the error
  85    number.  If the operation is not supported, -1 is returned.
  86
  87    Currently supported threads packages are
  88      TPF threads with -D__tpf__
  89      POSIX/Unix98 threads with -D_PTHREADS
  90      POSIX/Unix95 threads with -D_PTHREADS95
  91      DCE threads with -D_DCE_THREADS
  92      Solaris/UI threads with -D_SOLARIS_THREADS
  93 */
  94
  95 /* Check first for thread specific defines.  */
  96 #if defined (__tpf__)
  97 #include "gthr-tpf.h"
  98 #elif _PTHREADS
  99 #include "gthr-posix.h"
 100 #elif _PTHREADS95
 101 #include "gthr-posix95.h"
 102 #elif _DCE_THREADS
 103 #include "gthr-dce.h"
 104 #elif _SOLARIS_THREADS
 105 #include "gthr-solaris.h"
 106
 107 /* Include GTHREAD_FILE if one is defined.  */
 108 #elif defined(HAVE_GTHR_DEFAULT)
 109 #if SUPPORTS_WEAK
 110 #ifndef GTHREAD_USE_WEAK
 111 #define GTHREAD_USE_WEAK 1
 112 #endif
 113 #endif
 114 #include "gthr-default.h"
 115
 116 /* Fallback to single thread definitions.  */
 117 #else
 118 #include "gthr-single.h"
 119 #endif
 120
 121 #ifndef HIDE_EXPORTS
 122 #pragma GCC visibility pop
 123 #endif
 124
 125 #endif /* ! GCC_GTHR_H */