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44 lines
1.3 KiB
C
44 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 "pthreadP.h"
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int
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pthread_spin_lock (pthread_spinlock_t *lock)
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{
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unsigned int __tmp;
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asm volatile (
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"1: lwarx %0,0,%1" 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. %2,0,%1\n"
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" bne- 2f\n"
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__ARCH_ACQ_INSTR "\n"
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" .subsection 1\n"
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"2: lwzx %0,0,%1\n"
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" cmpwi 0,%0,0\n"
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" bne 2b\n"
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" b 1b\n"
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" .previous"
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: "=&r" (__tmp)
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: "r" (lock), "r" (1)
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: "cr0", "memory");
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return 0;
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}
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