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47 lines
1.2 KiB
ArmAsm
47 lines
1.2 KiB
ArmAsm
/* Copyright (C) 2002-2017 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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#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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.globl pthread_spin_trylock
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.type pthread_spin_trylock,@function
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.align 16
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pthread_spin_trylock:
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movl 4(%esp), %edx
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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, (%edx)
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movl $EBUSY, %eax
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#ifdef HAVE_CMOV
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cmovel %ecx, %eax
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#else
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jne 0f
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movl %ecx, %eax
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0:
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#endif
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ret
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.size pthread_spin_trylock,.-pthread_spin_trylock
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