10Sstevel@tonic-gate/* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 54574Sraf * Common Development and Distribution License (the "License"). 64574Sraf * You may not use this file except in compliance with the License. 70Sstevel@tonic-gate * 80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 100Sstevel@tonic-gate * See the License for the specific language governing permissions 110Sstevel@tonic-gate * and limitations under the License. 120Sstevel@tonic-gate * 130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 180Sstevel@tonic-gate * 190Sstevel@tonic-gate * CDDL HEADER END 200Sstevel@tonic-gate */ 214574Sraf 220Sstevel@tonic-gate/* 236515Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 240Sstevel@tonic-gate * Use is subject to license terms. 250Sstevel@tonic-gate */ 260Sstevel@tonic-gate 27*7298SMark.J.Nelson@Sun.COM .file "_lwp_mutex_unlock.s" 280Sstevel@tonic-gate 290Sstevel@tonic-gate#include "SYS.h" 300Sstevel@tonic-gate#include <../assym.h> 310Sstevel@tonic-gate 320Sstevel@tonic-gate ENTRY(_lwp_mutex_unlock) 330Sstevel@tonic-gate membar #LoadStore|#StoreStore 340Sstevel@tonic-gate add %o0, MUTEX_LOCK_WORD, %o1 350Sstevel@tonic-gate ld [%o1], %o2 360Sstevel@tonic-gate1: 370Sstevel@tonic-gate clr %o3 ! clear lock/get waiter field 380Sstevel@tonic-gate cas [%o1], %o2, %o3 ! atomically 390Sstevel@tonic-gate cmp %o2, %o3 400Sstevel@tonic-gate bne,a,pn %icc, 1b 410Sstevel@tonic-gate mov %o3, %o2 420Sstevel@tonic-gate btst WAITER_MASK, %o3 ! check for waiters 430Sstevel@tonic-gate beq,a,pt %icc,2f ! if no waiters 440Sstevel@tonic-gate clr %o0 ! return 0 450Sstevel@tonic-gate ! else (note that %o0 is still 460Sstevel@tonic-gate ! &mutex) 474574Sraf clr %o1 ! call kernel to wakeup waiter: 484574Sraf SYSTRAP_RVAL1(lwp_mutex_wakeup) ! lwp_mutex_wakeup(mp, 0) 490Sstevel@tonic-gate SYSLWPERR 500Sstevel@tonic-gate2: RET 510Sstevel@tonic-gate SET_SIZE(_lwp_mutex_unlock) 52