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59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/* Mutex implementation for libgomp plugins.
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Copyright (C) 2025-2026 Free Software Foundation, Inc.
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Contributed by BayLibre
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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 a minimal implementation of the gomp_mutex_t spinlocks, but
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without all the dependencies used by the config/linux/mutex implementation.
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At the time of writing, this is only used by simple_alloc which has
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short-lived locks and should be fine with these. The actual locks are in
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a header file, so only the fallback "slow" functions are needed here. */
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#include "config.h"
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#include <unistd.h>
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#include "libgomp.h"
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#ifndef HAVE_SYNC_BUILTINS
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#error "HAVE_SYNC_BUILTINS is required to build this"
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#endif
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void
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gomp_mutex_lock_slow (gomp_mutex_t *mutex, int oldval)
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{
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while (oldval == 1)
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{
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usleep (1);
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oldval = __atomic_exchange_n (mutex, 1, __ATOMIC_ACQUIRE);
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}
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}
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void
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gomp_mutex_unlock_slow (gomp_mutex_t *mutex)
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{
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GOMP_PLUGIN_fatal ("gomp_mutex_unlock_slow should be unreachable");
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}
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