57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
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/* Copyright (C) 2020-2022 Free Software Foundation, Inc.
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This file is part of the GNU Atomic Library (libatomic).
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Libatomic 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 of the License, or
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(at your option) any later version.
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Libatomic 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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/* Functions libat_lock_n/libat_unlock_n based on GOMP_atomic_start/end in
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libgomp/atomic.c. */
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#include "libatomic_i.h"
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static int atomic_lock;
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void
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libat_lock_n (void *ptr __attribute__((unused)),
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size_t n __attribute__((unused)))
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{
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while (__sync_lock_test_and_set (&atomic_lock, 1))
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; /* Spin. */
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}
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void
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libat_unlock_n (void *ptr __attribute__((unused)),
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size_t n __attribute__((unused)))
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{
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__sync_lock_release (&atomic_lock);
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}
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void
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libat_lock_1 (void *ptr)
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{
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libat_lock_n (ptr, 1);
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}
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void
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libat_unlock_1 (void *ptr)
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{
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libat_unlock_n (ptr, 1);
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}
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