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 511: 52 RETC 53 SET_SIZE(_lwp_mutex_unlock) 54