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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* ASSERTION:
* Positive test for ring buffer policy.
*
* SECTION: Buffers and Buffering/ring Policy;
* Buffers and Buffering/Buffer Sizes;
* Options and Tunables/bufsize;
* Options and Tunables/bufpolicy
*/
/*
* We make some regrettable assumptions about the implementation in this test.
* First, we assume that each entry for the printf() of an int takes _exactly_
* eight bytes (four bytes for the EPID, four bytes for the payload). Second,
* we assume that by allocating storage for n + 1 records, we will get exactly
* n. Here is why: the final predicate that evaluates to false will reserve
* space that it won't use. This act of reservation will advance the wrapped
* offset. That record won't be subsequently used, but the wrapped offset has
* advanced. (And in this case, that old record is clobbered by the exit()
* anyway.) Thirdly: we rely on t_cpu/cpu_id. Finally: we rely on being
* able to run on the CPU that we first ran on.
*/
#pragma D option bufpolicy=ring
#pragma D option bufsize=40
#pragma D option quiet
int n;
BEGIN
{
cpuid = -1;
}
tick-10msec
/cpuid == -1/
{
cpuid = curthread->t_cpu->cpu_id;
}
tick-10msec
/curthread->t_cpu->cpu_id == cpuid && n < 100/
{
printf("%d\n", n++);
}
tick-10msec
/n == 100/
{
exit(0);
}
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