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
55int n;
56
57BEGIN
58{
59	cpuid = -1;
60}
61
62tick-10msec
63/cpuid == -1/
64{
65	cpuid = curthread->t_cpu->cpu_id;
66}
67
68tick-10msec
69/curthread->t_cpu->cpu_id == cpuid && n < 100/
70{
71	printf("%d\n", n++);
72}
73
74tick-10msec
75/n == 100/
76{
77	exit(0);
78}
79