66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
/* Copyright (C) 2015-2020 Free Software Foundation, Inc.
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Contributed by Alexander Monakov <amonakov@ispras.ru>
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This file is part of the GNU Offloading and Multi Processing Library
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(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 an NVPTX specific implementation of a semaphore synchronization
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mechanism for libgomp. This type is private to the library. This
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semaphore implementation uses atomic instructions and busy waiting. */
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#ifndef GOMP_SEM_H
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#define GOMP_SEM_H 1
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typedef int gomp_sem_t;
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static inline void
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gomp_sem_init (gomp_sem_t *sem, int value)
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{
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*sem = value;
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}
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static inline void
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gomp_sem_destroy (gomp_sem_t *sem)
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{
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}
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static inline void
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gomp_sem_wait (gomp_sem_t *sem)
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{
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int count = __atomic_load_n (sem, MEMMODEL_ACQUIRE);
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for (;;)
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{
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while (count == 0)
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count = __atomic_load_n (sem, MEMMODEL_ACQUIRE);
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if (__atomic_compare_exchange_n (sem, &count, count - 1, false,
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MEMMODEL_ACQUIRE, MEMMODEL_RELAXED))
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return;
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}
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}
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static inline void
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gomp_sem_post (gomp_sem_t *sem)
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{
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(void) __atomic_add_fetch (sem, 1, MEMMODEL_RELEASE);
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}
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#endif /* GOMP_SEM_H */
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