usr/src/cmd/dtrace/test/tst/common/speculation/tst.SpeculationDiscard.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 2007 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: Test the normal behavior of speculate() and discard().
  31  *
  32  * SECTION: Speculative Tracing/Discarding a Speculation;
  33  *      Options and Tunables/cleanrate
  34  *
  35  */
  36 #pragma D option quiet
  37 #pragma D option cleanrate=2000hz
  38
  39 BEGIN
  40 {
  41         self->var = speculation();
  42         printf("Speculation ID: %d\n", self->var);
  43         self->speculate = 0;
  44         self->discard = 0;
  45 }
  46
  47 BEGIN
  48 /1 > self->speculate/
  49 {
  50         speculate(self->var);
  51         self->speculate++;
  52         printf("Called speculate on id: %d\n", self->var);
  53 }
  54
  55 BEGIN
  56 /1 <= self->speculate/
  57 {
  58         discard(self->var);
  59         self->discard++;
  60 }
  61
  62 BEGIN
  63 /(1 == self->discard)/
  64 {
  65         printf("Succesfully tested buffer discard\n");
  66         exit(0);
  67 }
  68
  69 BEGIN
  70 /(0 == self->discard)/
  71 {
  72         printf("Failed to discard buffer\n");
  73         exit(1);
  74 }