_lwp_mutex_unlock.s revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
.file "%M%"
#include <sys/asm_linkage.h>
ANSI_PRAGMA_WEAK(_lwp_mutex_unlock,function)
#include "SYS.h"
#include <assym.h>
ANSI_PRAGMA_WEAK2(_private_lwp_mutex_unlock,_lwp_mutex_unlock,function)
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
SYSTRAP_RVAL1(lwp_mutex_wakeup)
SYSLWPERR
RET
1:
RETC
SET_SIZE(_lwp_mutex_unlock)