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04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
38 lines
1.1 KiB
ArmAsm
38 lines
1.1 KiB
ArmAsm
/* Copyright (C) 2002-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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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 <pthread-errnos.h>
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#include <sysdep.h>
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#ifdef UP
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# define LOCK
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#else
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# define LOCK lock
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#endif
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ENTRY(pthread_spin_trylock)
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movl $1, %eax
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xorl %ecx, %ecx
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LOCK
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cmpxchgl %ecx, (%rdi)
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movl $EBUSY, %eax
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cmovel %ecx, %eax
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retq
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END(pthread_spin_trylock)
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