2N/A/*
2N/A * CDDL HEADER START
2N/A *
2N/A * The contents of this file are subject to the terms of the
2N/A * Common Development and Distribution License (the "License").
2N/A * You may not use this file except in compliance with the License.
2N/A *
2N/A * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
2N/A * or http://www.opensolaris.org/os/licensing.
2N/A * See the License for the specific language governing permissions
2N/A * and limitations under the License.
2N/A *
2N/A * When distributing Covered Code, include this CDDL HEADER in each
2N/A * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
2N/A * If applicable, add the following below this CDDL HEADER, with the
2N/A * fields enclosed by brackets "[]" replaced with your own identifying
2N/A * information: Portions Copyright [yyyy] [name of copyright owner]
2N/A *
2N/A * CDDL HEADER END
2N/A */
2N/A
2N/A/*
2N/A * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
2N/A * Use is subject to license terms.
2N/A */
2N/A
2N/A .file "_lwp_mutex_unlock.s"
2N/A
2N/A#include "SYS.h"
2N/A#include <../assym.h>
2N/A
2N/A ENTRY(_lwp_mutex_unlock)
2N/A movl 4(%esp), %eax
2N/A addl $MUTEX_LOCK_WORD, %eax
2N/A xorl %ecx, %ecx
2N/A xchgl (%eax), %ecx / clear lock and get old lock into %ecx
2N/A andl $WAITER_MASK, %ecx / was anyone waiting on it?
2N/A je 1f
2N/A movl 0(%esp), %ecx / prepare to call lwp_mutex_wakeup()
2N/A movl 4(%esp), %edx
2N/A movl $0, 4(%esp)
2N/A movl %edx, 0(%esp)
2N/A pushl %ecx
2N/A SYSTRAP_RVAL1(lwp_mutex_wakeup) / lwp_mutex_wakeup(mp, 0)
2N/A popl %ecx / reconstruct the stack frame
2N/A movl 0(%esp), %edx
2N/A movl %edx, 4(%esp)
2N/A movl %ecx, 0(%esp)
2N/A SYSLWPERR
2N/A RET
2N/A1:
2N/A RETC
2N/A SET_SIZE(_lwp_mutex_unlock)