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[msysgit/historical-msysgit.git] / mingw / include / c++ / 3.4.2 / mingw32 / bits / gthr.h
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1 /* Threads compatibility routines for libgcc2. */
2 /* Compile this one with gcc. */
3 /* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
5 This file is part of GCC.
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.
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.
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. */
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. */
29 #ifndef _GLIBCXX_GCC_GTHR_H
30 #define _GLIBCXX_GCC_GTHR_H
32 /* If this file is compiled with threads support, it must
33 #define __GTHREADS 1
34 to indicate that threads support is present. Also it has define
35 function
36 int __gthread_active_p ()
37 that returns 1 if thread system is active, 0 if not.
39 The threads interface must define the following types:
40 __gthread_key_t
41 __gthread_once_t
42 __gthread_mutex_t
44 The threads interface must define the following macros:
46 __GTHREAD_ONCE_INIT
47 to initialize __gthread_once_t
48 __GTHREAD_MUTEX_INIT
49 to initialize __gthread_mutex_t to get a fast
50 non-recursive mutex.
51 __GTHREAD_MUTEX_INIT_FUNCTION
52 some systems can't initialize a mutex without a
53 function call. On such systems, define this to a
54 function which looks like this:
55 void __GTHREAD_MUTEX_INIT_FUNCTION (__gthread_mutex_t *)
56 Don't define __GTHREAD_MUTEX_INIT in this case
58 The threads interface must define the following static functions:
60 int __gthread_once (__gthread_once_t *once, void (*func) ())
62 int __gthread_key_create (__gthread_key_t *keyp, void (*dtor) (void *))
63 int __gthread_key_delete (__gthread_key_t key)
65 void *__gthread_getspecific (__gthread_key_t key)
66 int __gthread_setspecific (__gthread_key_t key, const void *ptr)
68 int __gthread_mutex_lock (__gthread_mutex_t *mutex);
69 int __gthread_mutex_trylock (__gthread_mutex_t *mutex);
70 int __gthread_mutex_unlock (__gthread_mutex_t *mutex);
72 All functions returning int should return zero on success or the error
73 number. If the operation is not supported, -1 is returned.
75 Currently supported threads packages are
76 POSIX threads with -D_PTHREADS
77 DCE threads with -D_DCE_THREADS
78 Solaris/UI threads with -D_SOLARIS_THREADS
81 /* Check first for thread specific defines. */
82 #if _GLIBCXX__PTHREADS
83 #include <bits/gthr-posix.h>
84 #elif _GLIBCXX__DCE_THREADS
85 #include <bits/gthr-dce.h>
86 #elif _GLIBCXX__SOLARIS_THREADS
87 #include <bits/gthr-solaris.h>
89 /* Include GTHREAD_FILE if one is defined. */
90 #elif defined(_GLIBCXX_HAVE_GTHR_DEFAULT)
91 #if __GXX_WEAK__
92 #ifndef _GLIBCXX_GTHREAD_USE_WEAK
93 #define _GLIBCXX_GTHREAD_USE_WEAK 1
94 #endif
95 #endif
96 #include <bits/gthr-default.h>
98 /* Fallback to single thread definitions. */
99 #else
100 #include <bits/gthr-single.h>
101 #endif
103 #endif /* ! _GLIBCXX_GCC_GTHR_H */