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* 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
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* questions.
*/
/*
* @test
* @key stress
*
* @summary converted from VM testbase nsk/stress/thread/thread006.
* VM testbase keywords: [stress, diehard, slow, nonconcurrent, quick]
* VM testbase readme:
* DESCRIPTION
* Try many threads of lower priority
* starting simultaneously.
*
* @run main/othervm nsk.stress.thread.thread006 500 2m 5s
*/
package nsk.stress.thread;
import java.io.PrintStream;
/**
* Try many threads of lower priority starting simultaneously.
*/
public class thread006 extends Thread {
/**
* Enable/disable printing of debugging info.
*/
private static boolean DEBUG_MODE = false;
/**
* The minimal number of threads that the tested JVM must support.
* (This number should be specified by the command-line parameter.
*/
private static int THREADS_EXPECTED = 1000;
/**
* Timeout (in milliseconds) after which all threads must halt.
*/
private static long TIMEOUT = 300000; // 5 minutes
/**
* Wait few seconds to allow child threads actually start.
*/
private static long YIELD_TIME = 5000; // 5 seconds
/**
* Once <code>arg</code> is ``XXXs'', or ``XXXm'', or ``XXXms'',
* return the given number of seconds, minutes, or milliseconds
* correspondingly.
*/
private static long parseTime(String arg) {
for (int i = arg.lastIndexOf("ms"); i > -1; )
return Long.parseLong(arg.substring(0, i));
for (int i = arg.lastIndexOf("s"); i > -1; )
return Long.parseLong(arg.substring(0, i)) * 1000;
for (int i = arg.lastIndexOf("m"); i > -1; )
return Long.parseLong(arg.substring(0, i)) * 60000;
throw new IllegalArgumentException(
"cannot recognize time scale: " + arg);
}
/**
* Re-invoke to <code>run(args,out)</code> in a JCK style.
*/
public static void main(String args[]) {
int exitCode = run(args, System.out);
System.exit(exitCode + 95);
}
/**
* JavaTest-like entry: <code>args[]</code> may reset
* <code>THREADS_EXPECTED</code>, <code>TIMEOUT</code>
* and <code>YIELD_TIME</code> values.
*/
public static int run(String args[], PrintStream out) {
if (args.length > 0)
THREADS_EXPECTED = Integer.parseInt(args[0]);
if (args.length > 1)
TIMEOUT = parseTime(args[1]);
if (args.length > 2)
YIELD_TIME = parseTime(args[2]);
if (args.length > 3)
DEBUG_MODE = args[3].toLowerCase().startsWith("-v");
if (args.length > 4) {
out.println("#");
out.println("# Too namy command-line arguments!");
out.println("#");
return 2;
}
if (DEBUG_MODE) {
out.println("Start " + THREADS_EXPECTED + " threads of lower priority,");
out.println("wait " + YIELD_TIME + " milliseconds to let them go,");
out.println("and halt after " + TIMEOUT + " milliseconds:");
}
Thread thread[] = new Thread[THREADS_EXPECTED];
for (int i = 0; i < THREADS_EXPECTED; i++)
try {
thread[i] = new thread006();
thread[i].setPriority(Thread.MIN_PRIORITY);
if (thread[i].getPriority() == currentThread().getPriority()) {
out.println("*");
out.println("* Sorry! -- The test cannot execute because");
out.println("* it cannot create threads with lower priority");
out.println("* than that executing run(args[],out) method.");
out.println("*");
out.println("* However, since no JVM mistakes were found,");
out.println("* the test finishes as PASSED.");
out.println("*");
return 0;
}
thread[i].start();
if (DEBUG_MODE)
out.println("Threads started: " + (i + 1));
} catch (OutOfMemoryError oome) {
oome.printStackTrace(out);
out.println("#");
out.println("# The test have FAILED:");
out.println("# Only " + i + " threads could start,");
out.println("# while at least " + THREADS_EXPECTED +
" were expected.");
out.println("#");
return 2;
}
// Actually start:
GO = true;
// ...and let them go:
try {
doSleep(YIELD_TIME);
} catch (InterruptedException ie) {
ie.printStackTrace(out);
out.println("#");
out.println("# OOPS! Could not let threads actually start!");
out.println("#");
return 2;
}
STOP = true;
if (DEBUG_MODE)
out.println("The test have PASSED.");
return 0;
}
private static boolean GO = false;
private static boolean STOP = false;
/**
* The thread activity: do nothing special, but do not
* free CPU time so that the thread's memory could not
* be moved to swap file.
*/
public void run() {
while (!GO && !timeout())
Thread.yield();
while (!STOP && !timeout())
;
}
private static long startTime = System.currentTimeMillis();
/**
* Check if timeout for this test is exceeded.
*/
private boolean timeout() {
long elapsedTime = System.currentTimeMillis() - startTime;
return elapsedTime > TIMEOUT;
}
/**
* Yield to other threads for the given amount of
* <code>time</code> (milliseconds).
*/
private static void doSleep(long time) throws InterruptedException {
//
// Since Java 2, the method Thread.sleep() doesn't guarantee
// to yield to other threads. So, call Object.wait() to yield:
//
Object lock = new Object(); // local scope, nobody can notify it
synchronized (lock) {
lock.wait(time);
}
}
}