usr/src/cmd/dtrace/test/tst/common/speculation/tst.DiscardAftDiscard.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:
  31  * Can call discard on an already discarded buffer.
  32  *
  33  * SECTION: Speculative Tracing/Discarding a Speculation;
  34  *      Options and Tunables/cleanrate
  35  *
  36  */
  37 #pragma D option quiet
  38 #pragma D option cleanrate=3000hz
  39
  40 BEGIN
  41 {
  42         self->i = 0;
  43         self->discard1 = 0;
  44         self->discard2 = 0;
  45         var1 = speculation();
  46         printf("Speculation ID: %d\n", var1);
  47 }
  48
  49 BEGIN
  50 /var1/
  51 {
  52         speculate(var1);
  53         printf("This statement and the following are speculative!!\n");
  54         printf("Speculating on id: %d\n", var1);
  55         self->i++;
  56 }
  57
  58 BEGIN
  59 /(self->i)/
  60 {
  61         discard(var1);
  62         self->discard1++;
  63         discard(var1);
  64         self->discard2++;
  65 }
  66
  67 BEGIN
  68 /(self->discard2) && (self->discard1)/
  69 {
  70         printf("Discarded a discarded buffer\n");
  71         exit(0);
  72 }
  73
  74
  75 BEGIN
  76 /(!self->discard2) || (!self->discard1)/
  77 {
  78         printf("Couldnt discard a discarded buffer\n");
  79         exit(1);
  80 }
  81
  82 ERROR
  83 {
  84         exit(1);
  85 }