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36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
/* Copyright (C) 2003-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include "pthreadP.h"
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int
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pthread_spin_lock (lock)
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pthread_spinlock_t *lock;
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{
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int *p = (int *) lock;
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while (__builtin_expect (__sync_val_compare_and_swap (p, 0, 1), 0))
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{
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/* Spin without using the atomic instruction. */
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do
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__asm __volatile ("hint @pause" : : : "memory");
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while (*p);
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}
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return 0;
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}
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