1 /*
   2  * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 package org.graalvm.compiler.debug.test;
  26 
  27 import static org.graalvm.compiler.debug.DebugContext.DEFAULT_LOG_STREAM;
  28 import static org.graalvm.compiler.debug.DebugContext.NO_CONFIG_CUSTOMIZERS;
  29 import static org.graalvm.compiler.debug.DebugContext.NO_DESCRIPTION;
  30 import static org.graalvm.compiler.debug.DebugContext.NO_GLOBAL_METRIC_VALUES;
  31 import static org.junit.Assert.assertEquals;
  32 
  33 import jdk.internal.vm.compiler.collections.EconomicMap;
  34 import org.graalvm.compiler.debug.DebugCloseable;
  35 import org.graalvm.compiler.debug.DebugContext;
  36 import org.graalvm.compiler.debug.DebugOptions;
  37 import org.graalvm.compiler.debug.TimerKey;
  38 import org.graalvm.compiler.options.OptionKey;
  39 import org.graalvm.compiler.options.OptionValues;
  40 import org.graalvm.compiler.serviceprovider.GraalServices;
  41 import org.junit.Assume;
  42 import org.junit.AssumptionViolatedException;
  43 import org.junit.Before;
  44 import org.junit.Test;
  45 
  46 @SuppressWarnings("try")
  47 public class TimerKeyTest {
  48 
  49     @Before
  50     public void checkCapabilities() {
  51         assumeManagementLibraryIsLoadable();
  52         Assume.assumeTrue("skipping management interface test", GraalServices.isCurrentThreadCpuTimeSupported());
  53     }
  54 
  55     /** @see <a href="https://bugs.openjdk.java.net/browse/JDK-8076557">JDK-8076557</a> */
  56     static void assumeManagementLibraryIsLoadable() {
  57         try {
  58             /* Trigger loading of the management library using the bootstrap class loader. */
  59             GraalServices.getCurrentThreadAllocatedBytes();
  60         } catch (UnsatisfiedLinkError | NoClassDefFoundError | UnsupportedOperationException e) {
  61             throw new AssumptionViolatedException("Management interface is unavailable: " + e);
  62         }
  63     }
  64 
  65     /**
  66      * Actively spins the current thread for at least a given number of milliseconds in such a way
  67      * that timers for the current thread keep ticking over.
  68      *
  69      * @return the number of milliseconds actually spent spinning which is guaranteed to be >=
  70      *         {@code ms}
  71      */
  72     private static long spin(long ms) {
  73         long start = GraalServices.getCurrentThreadCpuTime();
  74         do {
  75             long durationMS = (GraalServices.getCurrentThreadCpuTime() - start) / 1000;
  76             if (durationMS >= ms) {
  77                 return durationMS;
  78             }
  79         } while (true);
  80     }
  81 
  82     /**
  83      * Asserts that a timer replied recursively without any other interleaving timers has the same
  84      * flat and accumulated times.
  85      */
  86     @Test
  87     public void test2() {
  88         EconomicMap<OptionKey<?>, Object> map = EconomicMap.create();
  89         map.put(DebugOptions.Time, "");
  90         OptionValues options = new OptionValues(map);
  91         DebugContext debug = DebugContext.create(options, NO_DESCRIPTION, NO_GLOBAL_METRIC_VALUES, DEFAULT_LOG_STREAM, NO_CONFIG_CUSTOMIZERS);
  92 
  93         TimerKey timerC = DebugContext.timer("TimerC");
  94         try (DebugCloseable c1 = timerC.start(debug)) {
  95             spin(50);
  96             try (DebugCloseable c2 = timerC.start(debug)) {
  97                 spin(50);
  98                 try (DebugCloseable c3 = timerC.start(debug)) {
  99                     spin(50);
 100                     try (DebugCloseable c4 = timerC.start(debug)) {
 101                         spin(50);
 102                         try (DebugCloseable c5 = timerC.start(debug)) {
 103                             spin(50);
 104                         }
 105                     }
 106                 }
 107             }
 108         }
 109         if (timerC.getFlat() != null) {
 110             assertEquals(timerC.getFlat().getCurrentValue(debug), timerC.getCurrentValue(debug));
 111         }
 112     }
 113 }