69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/* Copyright (C) 2005, 2008 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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) 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 Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with libgomp; see the file COPYING.LIB. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/* As a special exception, if you link this library with other files, some
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of which are compiled with GCC, to produce an executable, this library
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does not by itself cause the resulting executable to be covered by the
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GNU General Public License. This exception does not however invalidate
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any other reasons why the executable file might be covered by the GNU
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General Public License. */
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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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static inline void 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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extern void gomp_mutex_lock_slow (gomp_mutex_t *mutex);
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static inline void gomp_mutex_lock (gomp_mutex_t *mutex)
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{
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if (!__sync_bool_compare_and_swap (mutex, 0, 1))
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gomp_mutex_lock_slow (mutex);
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}
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extern void gomp_mutex_unlock_slow (gomp_mutex_t *mutex);
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/* IA64 needs a __sync_synchronize call before __sync_lock_test_and_set
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because __sync_lock_test_and_set is not a full memory fence. */
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static inline void gomp_mutex_unlock (gomp_mutex_t *mutex)
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{
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int val;
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__sync_synchronize ();
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val = __sync_lock_test_and_set (mutex, 0);
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if (__builtin_expect (val > 1, 0))
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gomp_mutex_unlock_slow (mutex);
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}
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static inline void gomp_mutex_destroy (gomp_mutex_t *mutex)
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{
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}
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#endif /* GOMP_MUTEX_H */
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