1 /* 2 * Copyright (c) 2014 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 package org.openjdk.bench.java.lang; 24 25 import org.openjdk.jmh.annotations.Benchmark; 26 import org.openjdk.jmh.annotations.BenchmarkMode; 27 import org.openjdk.jmh.annotations.Mode; 28 import org.openjdk.jmh.annotations.OutputTimeUnit; 29 import org.openjdk.jmh.annotations.Scope; 30 import org.openjdk.jmh.annotations.State; 31 import org.openjdk.jmh.annotations.TearDown; 32 33 import java.util.concurrent.TimeUnit; 34 35 /** 36 * Test to launch and gather threads. Measure time for different parts. 37 */ 38 @BenchmarkMode(Mode.AverageTime) 39 @OutputTimeUnit(TimeUnit.MICROSECONDS) 40 @State(Scope.Benchmark) 41 public class ThreadStartJoin { 42 43 private static final int THREADS = Runtime.getRuntime().availableProcessors(); 44 45 private Thread[] ts; 46 47 @Benchmark 48 public void test() throws InterruptedException { 49 ts = new TestThread[THREADS]; 50 51 for (int i = 0; i < THREADS; i++) { 52 ts[i] = new TestThread(); 53 } 54 55 for (int i = 0; i < THREADS; i++) { 56 ts[i].start(); 57 } 58 59 for (Thread mythread : ts) { 60 mythread.join(); 61 62 if (mythread.isAlive()) { 63 throw new IllegalStateException("Couldn't join in time in LPHhello."); 64 } 65 } 66 } 67 68 @TearDown 69 public final void cleanup() { 70 if (ts != null) { 71 for (Thread t : ts) { 72 if (t != null) { 73 t.interrupt(); 74 } 75 } 76 ts = null; 77 } 78 } 79 80 static final class TestThread extends Thread { 81 private static int num = 0; 82 83 public TestThread() { 84 super(TestThread.name()); 85 } 86 87 private synchronized static String name() { 88 return "TestThread-" + num++; 89 } 90 91 public void run() { 92 // do nothing 93 } 94 95 } 96 97 }