_lwp_mutex_unlock.s revision 7257d1b4d25bfac0c802847390e98a464fd787ac
/*
* 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.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
.file "%M%"
#include "SYS.h"
#include <../assym.h>
ENTRY(_lwp_mutex_unlock)
movl 4(%esp), %eax
addl $MUTEX_LOCK_WORD, %eax
xorl %ecx, %ecx
xchgl (%eax), %ecx / clear lock and get old lock into %ecx
andl $WAITER_MASK, %ecx / was anyone waiting on it?
je 1f
movl 0(%esp), %ecx / prepare to call lwp_mutex_wakeup()
movl 4(%esp), %edx
movl $0, 4(%esp)
movl %edx, 0(%esp)
pushl %ecx
SYSTRAP_RVAL1(lwp_mutex_wakeup) / lwp_mutex_wakeup(mp, 0)
popl %ecx / reconstruct the stack frame
movl 0(%esp), %edx
movl %edx, 4(%esp)
movl %ecx, 0(%esp)
SYSLWPERR
RET
1:
RETC
SET_SIZE(_lwp_mutex_unlock)