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 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * ASSERTION: 31 * Positive test for ring buffer policy. 32 * 33 * SECTION: Buffers and Buffering/ring Policy; 34 * Buffers and Buffering/Buffer Sizes; 35 * Options and Tunables/bufsize; 36 * Options and Tunables/bufpolicy 37 */ 38 39 /* 40 * We make some regrettable assumptions about the implementation in this test. 41 * First, we assume that each entry for the printf() of an int takes _exactly_ 42 * eight bytes (four bytes for the EPID, four bytes for the payload). Second, 43 * we assume that by allocating storage for n + 1 records, we will get exactly 44 * n. Here is why: the final predicate that evaluates to false will reserve 45 * space that it won't use. This act of reservation will advance the wrapped 46 * offset. That record won't be subsequently used, but the wrapped offset has 47 * advanced. (And in this case, that old record is clobbered by the exit() 48 * anyway.) Thirdly: we rely on t_cpu/cpu_id. Finally: we rely on being 49 * able to run on the CPU that we first ran on. 50 */ 51 #pragma D option bufpolicy=ring 52 #pragma D option bufsize=40 53 #pragma D option quiet 54 55 int n; 56 57 BEGIN 58 { 59 cpuid = -1; 60 } 61 62 tick-10msec 63 /cpuid == -1/ 64 { 65 cpuid = curthread->t_cpu->cpu_id; 66 } 67 68 tick-10msec 69 /curthread->t_cpu->cpu_id == cpuid && n < 100/ 70 { 71 printf("%d\n", n++); 72 } 73 74 tick-10msec 75 /n == 100/ 76 { 77 exit(0); 78 } 79