1 /* Threads compatibility routines for libgcc2. */ 2 /* Compile this one with gcc. */ 3 /* Copyright (C) 1997-2015 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 3, 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 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26 #ifndef _GLIBCXX_GCC_GTHR_H 27 #define _GLIBCXX_GCC_GTHR_H 28 29 #ifndef _GLIBCXX_HIDE_EXPORTS 30 #pragma GCC visibility push(default) 31 #endif 32 33 /* If this file is compiled with threads support, it must 34 #define __GTHREADS 1 35 to indicate that threads support is present. Also it has define 36 function 37 int __gthread_active_p () 38 that returns 1 if thread system is active, 0 if not. 39 40 The threads interface must define the following types: 41 __gthread_key_t 42 __gthread_once_t 43 __gthread_mutex_t 44 __gthread_recursive_mutex_t 45 46 The threads interface must define the following macros: 47 48 __GTHREAD_ONCE_INIT 49 to initialize __gthread_once_t 50 __GTHREAD_MUTEX_INIT 51 to initialize __gthread_mutex_t to get a fast 52 non-recursive mutex. 53 __GTHREAD_MUTEX_INIT_FUNCTION 54 to initialize __gthread_mutex_t to get a fast 55 non-recursive mutex. 56 Define this to a function which looks like this: 57 void __GTHREAD_MUTEX_INIT_FUNCTION (__gthread_mutex_t *) 58 Some systems can't initialize a mutex without a 59 function call. 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 int __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *mutex); 76 77 int __gthread_mutex_lock (__gthread_mutex_t *mutex); 78 int __gthread_mutex_trylock (__gthread_mutex_t *mutex); 79 int __gthread_mutex_unlock (__gthread_mutex_t *mutex); 80 81 int __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex); 82 int __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex); 83 int __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex); 84 85 The following are supported in POSIX threads only. They are required to 86 fix a deadlock in static initialization inside libsupc++. The header file 87 gthr-posix.h defines a symbol __GTHREAD_HAS_COND to signify that these extra 88 features are supported. 89 90 Types: 91 __gthread_cond_t 92 93 Macros: 94 __GTHREAD_COND_INIT 95 __GTHREAD_COND_INIT_FUNCTION 96 97 Interface: 98 int __gthread_cond_broadcast (__gthread_cond_t *cond); 99 int __gthread_cond_wait (__gthread_cond_t *cond, __gthread_mutex_t *mutex); 100 int __gthread_cond_wait_recursive (__gthread_cond_t *cond, 101 __gthread_recursive_mutex_t *mutex); 102 103 All functions returning int should return zero on success or the error 104 number. If the operation is not supported, -1 is returned. 105 106 If the following are also defined, you should 107 #define __GTHREADS_CXX0X 1 108 to enable the c++0x thread library. 109 110 Types: 111 __gthread_t 112 __gthread_time_t 113 114 Interface: 115 int __gthread_create (__gthread_t *thread, void *(*func) (void*), 116 void *args); 117 int __gthread_join (__gthread_t thread, void **value_ptr); 118 int __gthread_detach (__gthread_t thread); 119 int __gthread_equal (__gthread_t t1, __gthread_t t2); 120 __gthread_t __gthread_self (void); 121 int __gthread_yield (void); 122 123 int __gthread_mutex_timedlock (__gthread_mutex_t *m, 124 const __gthread_time_t *abs_timeout); 125 int __gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *m, 126 const __gthread_time_t *abs_time); 127 128 int __gthread_cond_signal (__gthread_cond_t *cond); 129 int __gthread_cond_timedwait (__gthread_cond_t *cond, 130 __gthread_mutex_t *mutex, 131 const __gthread_time_t *abs_timeout); 132 133 */ 134 135 #if __GXX_WEAK__ 136 /* The pe-coff weak support isn't fully compatible to ELF's weak. 137 For static libraries it might would work, but as we need to deal 138 with shared versions too, we disable it for mingw-targets. */ 139 #ifdef __MINGW32__ 140 #undef _GLIBCXX_GTHREAD_USE_WEAK 141 #define _GLIBCXX_GTHREAD_USE_WEAK 0 142 #endif 143 144 #ifndef _GLIBCXX_GTHREAD_USE_WEAK 145 #define _GLIBCXX_GTHREAD_USE_WEAK 1 146 #endif 147 #endif 148 149 #ifdef L4_MINIMAL_LIBC 150 #include <bits/gthr-single.h> 151 #else 152 #include <bits/gthr-default.h> 153 #endif 154 155 #ifndef _GLIBCXX_HIDE_EXPORTS 156 #pragma GCC visibility pop 157 #endif 158 159 #endif /* ! _GLIBCXX_GCC_GTHR_H */ 160