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