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gthr.h
/* Threads compatibility routines for libgcc2. */ /* Compile this one with gcc. */ /* Copyright (C) 1997-2018 Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ #ifndef _GLIBCXX_GCC_GTHR_H #define _GLIBCXX_GCC_GTHR_H #ifndef _GLIBCXX_HIDE_EXPORTS #pragma GCC visibility push(default) #endif /* If this file is compiled with threads support, it must #define __GTHREADS 1 to indicate that threads support is present. Also it has define function int __gthread_active_p () that returns 1 if thread system is active, 0 if not. The threads interface must define the following types: __gthread_key_t __gthread_once_t __gthread_mutex_t __gthread_recursive_mutex_t The threads interface must define the following macros: __GTHREAD_ONCE_INIT to initialize __gthread_once_t __GTHREAD_MUTEX_INIT to initialize __gthread_mutex_t to get a fast non-recursive mutex. __GTHREAD_MUTEX_INIT_FUNCTION to initialize __gthread_mutex_t to get a fast non-recursive mutex. Define this to a function which looks like this: void __GTHREAD_MUTEX_INIT_FUNCTION (__gthread_mutex_t *) Some systems can't initialize a mutex without a function call. Don't define __GTHREAD_MUTEX_INIT in this case. __GTHREAD_RECURSIVE_MUTEX_INIT __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION as above, but for a recursive mutex. The threads interface must define the following static functions: int __gthread_once (__gthread_once_t *once, void (*func) ()) int __gthread_key_create (__gthread_key_t *keyp, void (*dtor) (void *)) int __gthread_key_delete (__gthread_key_t key) void *__gthread_getspecific (__gthread_key_t key) int __gthread_setspecific (__gthread_key_t key, const void *ptr) int __gthread_mutex_destroy (__gthread_mutex_t *mutex); int __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *mutex); int __gthread_mutex_lock (__gthread_mutex_t *mutex); int __gthread_mutex_trylock (__gthread_mutex_t *mutex); int __gthread_mutex_unlock (__gthread_mutex_t *mutex); int __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex); int __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex); int __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex); The following are supported in POSIX threads only. They are required to fix a deadlock in static initialization inside libsupc++. The header file gthr-posix.h defines a symbol __GTHREAD_HAS_COND to signify that these extra features are supported. Types: __gthread_cond_t Macros: __GTHREAD_COND_INIT __GTHREAD_COND_INIT_FUNCTION Interface: int __gthread_cond_broadcast (__gthread_cond_t *cond); int __gthread_cond_wait (__gthread_cond_t *cond, __gthread_mutex_t *mutex); int __gthread_cond_wait_recursive (__gthread_cond_t *cond, __gthread_recursive_mutex_t *mutex); All functions returning int should return zero on success or the error number. If the operation is not supported, -1 is returned. If the following are also defined, you should #define __GTHREADS_CXX0X 1 to enable the c++0x thread library. Types: __gthread_t __gthread_time_t Interface: int __gthread_create (__gthread_t *thread, void *(*func) (void*), void *args); int __gthread_join (__gthread_t thread, void **value_ptr); int __gthread_detach (__gthread_t thread); int __gthread_equal (__gthread_t t1, __gthread_t t2); __gthread_t __gthread_self (void); int __gthread_yield (void); int __gthread_mutex_timedlock (__gthread_mutex_t *m, const __gthread_time_t *abs_timeout); int __gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *m, const __gthread_time_t *abs_time); int __gthread_cond_signal (__gthread_cond_t *cond); int __gthread_cond_timedwait (__gthread_cond_t *cond, __gthread_mutex_t *mutex, const __gthread_time_t *abs_timeout); */ #if __GXX_WEAK__ /* The pe-coff weak support isn't fully compatible to ELF's weak. For static libraries it might would work, but as we need to deal with shared versions too, we disable it for mingw-targets. */ #ifdef __MINGW32__ #undef _GLIBCXX_GTHREAD_USE_WEAK #define _GLIBCXX_GTHREAD_USE_WEAK 0 #endif #ifndef _GLIBCXX_GTHREAD_USE_WEAK #define _GLIBCXX_GTHREAD_USE_WEAK 1 #endif #endif #include <bits/gthr-default.h> #ifndef _GLIBCXX_HIDE_EXPORTS #pragma GCC visibility pop #endif #endif /* ! _GLIBCXX_GCC_GTHR_H */