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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.file "_lwp_mutex_unlock.s"
#include "SYS.h"
#include <../assym.h>
ENTRY(_lwp_mutex_unlock)
movq %rdi, %rax
addq $MUTEX_LOCK_WORD, %rax
xorl %ecx, %ecx
xchgl (%rax), %ecx /* clear lock and get old lock into %ecx */
andl $WAITER_MASK, %ecx /* was anyone waiting on it? */
je 1f
xorl %esi, %esi
SYSTRAP_RVAL1(lwp_mutex_wakeup) /* lwp_mutex_wakeup(mp, 0) */
SYSLWPERR
RET
1:
RETC
SET_SIZE(_lwp_mutex_unlock)
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