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 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 .file "lock.s" 27 28#include "SYS.h" 29 30/ 31/ _lock_try(lp) 32/ - returns non-zero on success. 33/ 34 ENTRY(_lock_try) 35 movl $1,%eax 36 xchgb %al, (%rdi) 37 xorb $1, %al 38 ret 39 SET_SIZE(_lock_try) 40 41/ 42/ _lock_clear(lp) 43/ - clear lock and force it to appear unlocked in memory. 44/ 45 ENTRY(_lock_clear) 46 movb $0, (%rdi) 47 ret 48 SET_SIZE(_lock_clear) 49