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48 lines
1.2 KiB
ArmAsm
48 lines
1.2 KiB
ArmAsm
/* Copyright (C) 2002-2014 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 <sysdep.h>
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#include <lowlevellock.h>
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#include <shlib-compat.h>
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#include <pthread-errnos.h>
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.text
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.globl sem_trywait
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.type sem_trywait,@function
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.align 16
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sem_trywait:
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movl (%rdi), %eax
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2: testl %eax, %eax
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jz 1f
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leal -1(%rax), %edx
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LOCK
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cmpxchgl %edx, (%rdi)
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jne 2b
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xorl %eax, %eax
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retq
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1:
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movq errno@gottpoff(%rip), %rdx
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movl $EAGAIN, %fs:(%rdx)
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orl $-1, %eax
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retq
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.size sem_trywait,.-sem_trywait
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