155 lines
5.4 KiB
C
155 lines
5.4 KiB
C
/* Threads compatibility routines for libgcc2. */
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/* Compile this one with gcc. */
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/* Copyright (C) 1997-2019 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_GTHR_H
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#define GCC_GTHR_H
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#ifndef HIDE_EXPORTS
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#pragma GCC visibility push(default)
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#endif
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/* If this file is compiled with threads support, it must
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#define __GTHREADS 1
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to indicate that threads support is present. Also it has define
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function
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int __gthread_active_p ()
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that returns 1 if thread system is active, 0 if not.
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The threads interface must define the following types:
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__gthread_key_t
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__gthread_once_t
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__gthread_mutex_t
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__gthread_recursive_mutex_t
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The threads interface must define the following macros:
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__GTHREAD_ONCE_INIT
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to initialize __gthread_once_t
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__GTHREAD_MUTEX_INIT
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to initialize __gthread_mutex_t to get a fast
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non-recursive mutex.
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__GTHREAD_MUTEX_INIT_FUNCTION
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to initialize __gthread_mutex_t to get a fast
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non-recursive mutex.
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Define this to a function which looks like this:
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void __GTHREAD_MUTEX_INIT_FUNCTION (__gthread_mutex_t *)
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Some systems can't initialize a mutex without a
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function call. Don't define __GTHREAD_MUTEX_INIT in this case.
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__GTHREAD_RECURSIVE_MUTEX_INIT
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__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION
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as above, but for a recursive mutex.
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The threads interface must define the following static functions:
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int __gthread_once (__gthread_once_t *once, void (*func) ())
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int __gthread_key_create (__gthread_key_t *keyp, void (*dtor) (void *))
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int __gthread_key_delete (__gthread_key_t key)
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void *__gthread_getspecific (__gthread_key_t key)
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int __gthread_setspecific (__gthread_key_t key, const void *ptr)
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int __gthread_mutex_destroy (__gthread_mutex_t *mutex);
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int __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *mutex);
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int __gthread_mutex_lock (__gthread_mutex_t *mutex);
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int __gthread_mutex_trylock (__gthread_mutex_t *mutex);
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int __gthread_mutex_unlock (__gthread_mutex_t *mutex);
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int __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex);
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int __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex);
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int __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex);
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The following are supported in POSIX threads only. They are required to
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fix a deadlock in static initialization inside libsupc++. The header file
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gthr-posix.h defines a symbol __GTHREAD_HAS_COND to signify that these extra
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features are supported.
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Types:
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__gthread_cond_t
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Macros:
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__GTHREAD_COND_INIT
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__GTHREAD_COND_INIT_FUNCTION
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Interface:
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int __gthread_cond_broadcast (__gthread_cond_t *cond);
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int __gthread_cond_wait (__gthread_cond_t *cond, __gthread_mutex_t *mutex);
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int __gthread_cond_wait_recursive (__gthread_cond_t *cond,
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__gthread_recursive_mutex_t *mutex);
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All functions returning int should return zero on success or the error
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number. If the operation is not supported, -1 is returned.
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If the following are also defined, you should
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#define __GTHREADS_CXX0X 1
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to enable the c++0x thread library.
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Types:
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__gthread_t
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__gthread_time_t
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Interface:
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int __gthread_create (__gthread_t *thread, void *(*func) (void*),
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void *args);
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int __gthread_join (__gthread_t thread, void **value_ptr);
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int __gthread_detach (__gthread_t thread);
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int __gthread_equal (__gthread_t t1, __gthread_t t2);
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__gthread_t __gthread_self (void);
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int __gthread_yield (void);
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int __gthread_mutex_timedlock (__gthread_mutex_t *m,
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const __gthread_time_t *abs_timeout);
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int __gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *m,
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const __gthread_time_t *abs_time);
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int __gthread_cond_signal (__gthread_cond_t *cond);
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int __gthread_cond_timedwait (__gthread_cond_t *cond,
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__gthread_mutex_t *mutex,
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const __gthread_time_t *abs_timeout);
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*/
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#if SUPPORTS_WEAK
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/* The pe-coff weak support isn't fully compatible to ELF's weak.
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For static libraries it might would work, but as we need to deal
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with shared versions too, we disable it for mingw-targets. */
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#ifdef __MINGW32__
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#undef GTHREAD_USE_WEAK
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#define GTHREAD_USE_WEAK 0
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#endif
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#ifndef GTHREAD_USE_WEAK
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#define GTHREAD_USE_WEAK 1
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#endif
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#endif
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#include "gthr-default.h"
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#ifndef HIDE_EXPORTS
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#pragma GCC visibility pop
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#endif
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#endif /* ! GCC_GTHR_H */
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