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/* Copyright (C) 2002, 2003, 2005 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 <shlib-compat.h>
#include <pthread-errnos.h>
#ifndef UP
# define LOCK lock
#else
# define
#endif
#define SYS_futex 202
#define FUTEX_WAKE 1
.text
.globl sem_post
.type sem_post,@function
.align 16
sem_post:
movl $1, %edx
LOCK
xaddl %edx, (%rdi)
movl $SYS_futex, %eax
movl $FUTEX_WAKE, %esi
incl %edx
syscall
testq %rax, %rax
js 1f
xorl %eax, %eax
retq
1:
#if USE___THREAD
movq errno@gottpoff(%rip), %rdx
movl $EINVAL, %fs:(%rdx)
#else
callq __errno_location@plt
movl $EINVAL, (%rax)
#endif
orl $-1, %eax
retq
.size sem_post,.-sem_post
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