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35 lines
1.2 KiB
C
35 lines
1.2 KiB
C
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/* Copyright (C) 2003 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include "pthreadP.h"
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int
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pthread_spin_trylock (pthread_spinlock_t *lock)
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{
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int res;
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__asm __volatile
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("ldstub [%1], %0\n"
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"membar #StoreLoad | #StoreStore"
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: "=r" (res)
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: "r" (lock)
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: "memory");
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return res == 0 ? 0 : EBUSY;
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}
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