94 lines
3.4 KiB
Java
94 lines
3.4 KiB
Java
/*
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* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6434084
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* @summary Exercise ThreadLocal javadoc "demo" class ThreadId
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* @author Pete Soper
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*/
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public final class TestThreadId extends Thread {
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// number of times to create threads and gather their ids
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private static final int ITERATIONCOUNT = 50;
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// Threads constructed per iteration. ITERATIONCOUNT=50 and
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// THREADCOUNT=50 takes about one second on a sun Blade 1000 (2x750mhz)
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private static final int THREADCOUNT = 50;
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// The thread local storage object for holding per-thread ids
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private static ThreadId id = new ThreadId();
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// Holds the per-thread so main method thread can collect it. JMM
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// guarantees this is valid after this thread joins main method thread.
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private int value;
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private synchronized int getIdValue() {
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return value;
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}
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// Each child thread just publishes its id value for validation
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public void run() {
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value = id.get();
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}
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public static void main(String args[]) throws Throwable {
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// holds true corresponding to a used id value
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boolean check[] = new boolean[THREADCOUNT*ITERATIONCOUNT];
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// the test threads
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TestThreadId u[] = new TestThreadId[THREADCOUNT];
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for (int i = 0; i < ITERATIONCOUNT; i++) {
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// Create and start the threads
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for (int t=0;t<THREADCOUNT;t++) {
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u[t] = new TestThreadId();
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u[t].start();
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}
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// Join with each thread and get/check its id
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for (int t=0;t<THREADCOUNT;t++) {
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try {
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u[t].join();
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} catch (InterruptedException e) {
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throw new RuntimeException(
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"TestThreadId: Failed with unexpected exception" + e);
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}
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try {
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if (check[u[t].getIdValue()]) {
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throw new RuntimeException(
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"TestThreadId: Failed with duplicated id: " +
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u[t].getIdValue());
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} else {
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check[u[t].getIdValue()] = true;
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}
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} catch (Exception e) {
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throw new RuntimeException(
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"TestThreadId: Failed with unexpected id value" + e);
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}
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}
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}
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} // main
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} // TestThreadId
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