63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
/* Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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Contributed by Jakub Jelinek <jakub@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_PTRLOCK_H
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#define GOMP_PTRLOCK_H 1
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typedef void *gomp_ptrlock_t;
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static inline void gomp_ptrlock_init (gomp_ptrlock_t *ptrlock, void *ptr)
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{
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*ptrlock = ptr;
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}
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extern void *gomp_ptrlock_get_slow (gomp_ptrlock_t *ptrlock);
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static inline void *gomp_ptrlock_get (gomp_ptrlock_t *ptrlock)
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{
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if ((uintptr_t) *ptrlock > 2)
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return *ptrlock;
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if (__sync_bool_compare_and_swap (ptrlock, NULL, (uintptr_t) 1))
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return NULL;
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return gomp_ptrlock_get_slow (ptrlock);
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}
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extern void gomp_ptrlock_set_slow (gomp_ptrlock_t *ptrlock, void *ptr);
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static inline void gomp_ptrlock_set (gomp_ptrlock_t *ptrlock, void *ptr)
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{
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if (!__sync_bool_compare_and_swap (ptrlock, (uintptr_t) 1, ptr))
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gomp_ptrlock_set_slow (ptrlock, ptr);
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}
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static inline void gomp_ptrlock_destroy (gomp_ptrlock_t *ptrlock)
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{
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}
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#endif /* GOMP_PTRLOCK_H */
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