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42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Paul Mackerras <paulus@au.ibm.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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<https://www.gnu.org/licenses/>. */
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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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unsigned int old;
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int err = EBUSY;
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asm ("1: lwarx %0,0,%2" MUTEX_HINT_ACQ "\n"
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" cmpwi 0,%0,0\n"
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" bne 2f\n"
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" stwcx. %3,0,%2\n"
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" bne- 1b\n"
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" li %1,0\n"
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__ARCH_ACQ_INSTR "\n"
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"2: "
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: "=&r" (old), "=&r" (err)
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: "r" (lock), "r" (1), "1" (err)
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: "cr0", "memory");
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return err;
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}
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