1 #!/usr/sbin/dtrace -ws 2 /* 3 * CDDL HEADER START 4 * 5 * The contents of this file are subject to the terms of the 6 * Common Development and Distribution License (the "License"). 7 * You may not use this file except in compliance with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* 24 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 /* 29 * ASSERTION: 30 * Destructive actions may never be speculative. 31 * 32 * SECTION: Speculative Tracing/Using a Speculation 33 * SECTION: dtrace(8) Utility/ -w option 34 */ 35 #pragma D option quiet 36 37 BEGIN 38 { 39 i = 0; 40 } 41 42 profile:::tick-1sec 43 /i < 1/ 44 { 45 var = speculation(); 46 speculate(var); 47 printf("Speculation ID: %d", var); 48 stop(); 49 i++; 50 } 51 52 profile:::tick-1sec 53 /1 == i/ 54 { 55 exit(0); 56 } 57 58 ERROR 59 { 60 exit(0); 61 } 62 63 END 64 { 65 exit(0); 66 } 67