libgcc/gthr.h

   1 /* Threads compatibility routines for libgcc2.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997, 1998, 2004, 2008, 2009, 2011
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  */
  26
  27 #ifndef GCC_GTHR_H
  28 #define GCC_GTHR_H
  29
  30 #ifndef HIDE_EXPORTS
  31 #pragma GCC visibility push(default)
  32 #endif
  33
  34 /* If this file is compiled with threads support, it must
  35        #define __GTHREADS 1
  36    to indicate that threads support is present.  Also it has define
  37    function
  38      int __gthread_active_p ()
  39    that returns 1 if thread system is active, 0 if not.
  40
  41    The threads interface must define the following types:
  42      __gthread_key_t
  43      __gthread_once_t
  44      __gthread_mutex_t
  45      __gthread_recursive_mutex_t
  46
  47    The threads interface must define the following macros:
  48
  49      __GTHREAD_ONCE_INIT
  50                 to initialize __gthread_once_t
  51      __GTHREAD_MUTEX_INIT
  52                 to initialize __gthread_mutex_t to get a fast
  53                 non-recursive mutex.
  54      __GTHREAD_MUTEX_INIT_FUNCTION
  55                 some systems can't initialize a mutex without a
  56                 function call.  On such systems, define this to a
  57                 function which looks like this:
  58                   void __GTHREAD_MUTEX_INIT_FUNCTION (__gthread_mutex_t *)
  59                 Don't define __GTHREAD_MUTEX_INIT in this case
  60      __GTHREAD_RECURSIVE_MUTEX_INIT
  61      __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION
  62                 as above, but for a recursive mutex.
  63
  64    The threads interface must define the following static functions:
  65
  66      int __gthread_once (__gthread_once_t *once, void (*func) ())
  67
  68      int __gthread_key_create (__gthread_key_t *keyp, void (*dtor) (void *))
  69      int __gthread_key_delete (__gthread_key_t key)
  70
  71      void *__gthread_getspecific (__gthread_key_t key)
  72      int __gthread_setspecific (__gthread_key_t key, const void *ptr)
  73
  74      int __gthread_mutex_destroy (__gthread_mutex_t *mutex);
  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    The following are supported in POSIX threads only. They are required to
  85    fix a deadlock in static initialization inside libsupc++. The header file
  86    gthr-posix.h defines a symbol __GTHREAD_HAS_COND to signify that these extra
  87    features are supported.
  88
  89    Types:
  90      __gthread_cond_t
  91
  92    Macros:
  93      __GTHREAD_COND_INIT
  94      __GTHREAD_COND_INIT_FUNCTION
  95
  96    Interface:
  97      int __gthread_cond_broadcast (__gthread_cond_t *cond);
  98      int __gthread_cond_wait (__gthread_cond_t *cond, __gthread_mutex_t *mutex);
  99      int __gthread_cond_wait_recursive (__gthread_cond_t *cond,
 100                                         __gthread_recursive_mutex_t *mutex);
 101
 102    All functions returning int should return zero on success or the error
 103    number.  If the operation is not supported, -1 is returned.
 104
 105    If the following are also defined, you should
 106      #define __GTHREADS_CXX0X 1
 107    to enable the c++0x thread library.
 108
 109    Types:
 110      __gthread_t
 111      __gthread_time_t
 112
 113    Interface:
 114      int __gthread_create (__gthread_t *thread, void *(*func) (void*),
 115                            void *args);
 116      int __gthread_join (__gthread_t thread, void **value_ptr);
 117      int __gthread_detach (__gthread_t thread);
 118      int __gthread_equal (__gthread_t t1, __gthread_t t2);
 119      __gthread_t __gthread_self (void);
 120      int __gthread_yield (void);
 121
 122      int __gthread_mutex_timedlock (__gthread_mutex_t *m,
 123                                     const __gthread_time_t *abs_timeout);
 124      int __gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *m,
 125                                           const __gthread_time_t *abs_time);
 126
 127      int __gthread_cond_signal (__gthread_cond_t *cond);
 128      int __gthread_cond_timedwait (__gthread_cond_t *cond,
 129                                    __gthread_mutex_t *mutex,
 130                                    const __gthread_time_t *abs_timeout);
 131      int __gthread_cond_timedwait_recursive (__gthread_cond_t *cond,
 132                                              __gthread_recursive_mutex_t *mutex,
 133                                              const __gthread_time_t *abs_time)
 134
 135 */
 136
 137 #if SUPPORTS_WEAK
 138 /* The pe-coff weak support isn't fully compatible to ELF's weak.
 139    For static libraries it might would work, but as we need to deal
 140    with shared versions too, we disable it for mingw-targets.  */
 141 #ifdef __MINGW32__
 142 #undef GTHREAD_USE_WEAK
 143 #define GTHREAD_USE_WEAK 0
 144 #endif
 145
 146 #ifndef GTHREAD_USE_WEAK
 147 #define GTHREAD_USE_WEAK 1
 148 #endif
 149 #endif
 150 #include "gthr-default.h"
 151
 152 #ifndef HIDE_EXPORTS
 153 #pragma GCC visibility pop
 154 #endif
 155
 156 #endif /* ! GCC_GTHR_H */