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/* Copyright (C) 2002, 2003, 2005, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <lowlevellock.h>
#include <pthread-errnos.h>
.text
.globl sem_trywait
.type sem_trywait,@function
.align 16
sem_trywait:
movl (%rdi), %eax
2: testl %eax, %eax
jz 1f
leal -1(%rax), %edx
LOCK
cmpxchgl %edx, (%rdi)
jne 2b
xorl %eax, %eax
retq
1:
#if USE___THREAD
movq errno@gottpoff(%rip), %rdx
movl $EAGAIN, %fs:(%rdx)
#else
callq __errno_location@plt
movl $EAGAIN, (%rax)
#endif
orl $-1, %eax
retq
.size sem_trywait,.-sem_trywait
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