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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgomp/] [config/] [linux/] [mutex.h] - Blame information for rev 735

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1 735 jeremybenn
/* Copyright (C) 2005, 2009, 2011 Free Software Foundation, Inc.
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   Contributed by Richard Henderson <rth@redhat.com>.
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   This file is part of the GNU OpenMP Library (libgomp).
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   Libgomp is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3, or (at your option)
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   any later version.
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   Libgomp 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 FITNESS
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   FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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   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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/* This is a Linux specific implementation of a mutex synchronization
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   mechanism for libgomp.  This type is private to the library.  This
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   implementation uses atomic instructions and the futex syscall.  */
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#ifndef GOMP_MUTEX_H
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#define GOMP_MUTEX_H 1
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typedef int gomp_mutex_t;
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#define GOMP_MUTEX_INIT_0 1
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extern void gomp_mutex_lock_slow (gomp_mutex_t *mutex, int);
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extern void gomp_mutex_unlock_slow (gomp_mutex_t *mutex);
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static inline void
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gomp_mutex_init (gomp_mutex_t *mutex)
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{
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  *mutex = 0;
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}
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static inline void
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gomp_mutex_destroy (gomp_mutex_t *mutex)
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{
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}
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static inline void
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gomp_mutex_lock (gomp_mutex_t *mutex)
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{
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  int oldval = 0;
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  if (!__atomic_compare_exchange_n (mutex, &oldval, 1, false,
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                                    MEMMODEL_ACQUIRE, MEMMODEL_RELAXED))
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    gomp_mutex_lock_slow (mutex, oldval);
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}
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static inline void
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gomp_mutex_unlock (gomp_mutex_t *mutex)
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{
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  int wait = __atomic_exchange_n (mutex, 0, MEMMODEL_RELEASE);
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  if (__builtin_expect (wait < 0, 0))
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    gomp_mutex_unlock_slow (mutex);
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}
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#endif /* GOMP_MUTEX_H */

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