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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 	.file	"_lwp_mutex_unlock.s"
     28 
     29 #include "SYS.h"
     30 #include <../assym.h>
     31 
     32 	ENTRY(_lwp_mutex_unlock)
     33 	movl	4(%esp), %eax
     34 	addl	$MUTEX_LOCK_WORD, %eax
     35 	xorl	%ecx, %ecx
     36 	xchgl	(%eax), %ecx	/ clear lock and get old lock into %ecx
     37 	andl	$WAITER_MASK, %ecx / was anyone waiting on it?
     38 	je	1f
     39 	movl	0(%esp), %ecx	/ prepare to call lwp_mutex_wakeup()
     40 	movl	4(%esp), %edx
     41 	movl	$0, 4(%esp)
     42 	movl	%edx, 0(%esp)
     43 	pushl	%ecx
     44 	SYSTRAP_RVAL1(lwp_mutex_wakeup)	/ lwp_mutex_wakeup(mp, 0)
     45 	popl	%ecx		/ reconstruct the stack frame
     46 	movl	0(%esp), %edx
     47 	movl	%edx, 4(%esp)
     48 	movl	%ecx, 0(%esp)
     49 	SYSLWPERR
     50 	RET
     51 1:
     52 	RETC
     53 	SET_SIZE(_lwp_mutex_unlock)
     54