usr/src/cmd/dtrace/test/tst/common/buffering/tst.ring1.d

   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  *      Options and Tunables/switchrate
  38  */
  39
  40 /*
  41  * We assume that a trace() of an integer stores at least 8 bytes.  If ring
  42  * buffering is not working properly, this trace() will induce a drop, and the
  43  * counter won't be incremented.  We set the switchrate to one second just to
  44  * sure that a high switchrate doesn't mask broken ring buffers.
  45  */
  46 #pragma D option bufpolicy=ring
  47 #pragma D option bufsize=50
  48 #pragma D option switchrate=1sec
  49
  50 int n;
  51 int i;
  52
  53 tick-10msec
  54 /n < 300/
  55 {
  56         trace(i);
  57         i++;
  58 }
  59
  60 tick-10msec
  61 /n < 300/
  62 {
  63         n++;
  64 }
  65
  66 tick-10msec
  67 /n == 300/
  68 {
  69         exit(2);
  70 }
  71
  72 END
  73 {
  74         exit(i == 300 ? 0 : 1);
  75 }