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/**
* @test
* @bug 8167108 8266130 8283467 8284632 8286830
* @summary Stress test JVM/TI StopThread() at thread exit.
* @requires vm.jvmti
* @run main/othervm/native -agentlib:StopAtExit StopAtExit
*/
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
public class StopAtExit extends Thread {
private final static int DEF_TIME_MAX = 30; // default max # secs to test
private final static String PROG_NAME = "StopAtExit";
private final static int JVMTI_ERROR_THREAD_NOT_ALIVE = 15;
public CountDownLatch exitSyncObj = new CountDownLatch(1);
public CountDownLatch startSyncObj = new CountDownLatch(1);
native static int stopThread(StopAtExit thr, Throwable exception);
@Override
public void run() {
try {
// Tell main thread we have started.
startSyncObj.countDown();
try {
// Wait for main thread to tell us to race to the exit.
exitSyncObj.await();
} catch (InterruptedException e) {
throw new RuntimeException("Unexpected: " + e);
}
} catch (ThreadDeath td) {
// ignore because we're testing JVM/TI StopThread() which throws it
} catch (NoClassDefFoundError ncdfe) {
// ignore because we're testing JVM/TI StopThread() which can cause it
}
}
public static void main(String[] args) {
int timeMax = 0;
if (args.length == 0) {
timeMax = DEF_TIME_MAX;
} else {
try {
timeMax = Integer.parseUnsignedInt(args[0]);
} catch (NumberFormatException nfe) {
System.err.println("'" + args[0] + "': invalid timeMax value.");
usage();
}
}
timeMax /= 2; // Split time between the two sub-tests.
test(timeMax);
// Fire-up deamon that just creates new threads. This generates contention on
// Threads_lock while worker tries to exit, creating more places where target
// can be seen as handshake safe.
Thread threadCreator = new Thread() {
@Override
public void run() {
while (true) {
Thread dummyThread = new Thread(() -> {});
dummyThread.start();
try {
dummyThread.join();
} catch(InterruptedException ie) {
}
}
}
};
threadCreator.setDaemon(true);
threadCreator.start();
test(timeMax);
}
public static void test(int timeMax) {
System.out.println("About to execute for " + timeMax + " seconds.");
long count = 0;
long start_time = System.currentTimeMillis();
while (System.currentTimeMillis() < start_time + (timeMax * 1000)) {
count++;
int retCode;
StopAtExit thread = new StopAtExit();
thread.start();
try {
// Wait for the worker thread to get going.
thread.startSyncObj.await();
// Tell the worker thread to race to the exit and the
// JVM/TI StopThread() calls will come in during thread exit.
thread.exitSyncObj.countDown();
long inner_count = 0;
while (true) {
inner_count++;
// Throw RuntimeException before ThreadDeath since a
// ThreadDeath can also be queued up when there's already
// a non-ThreadDeath async execution queued up.
Throwable myException;
if ((inner_count % 1) == 1) {
myException = new RuntimeException();
} else {
myException = new ThreadDeath();
}
retCode = stopThread(thread, myException);
if (retCode == JVMTI_ERROR_THREAD_NOT_ALIVE) {
// Done with JVM/TI StopThread() calls since
// thread is not alive.
break;
} else if (retCode != 0) {
throw new RuntimeException("thread " + thread.getName()
+ ": stopThread() " +
"retCode=" + retCode +
": unexpected value.");
}
if (!thread.isAlive()) {
// Done with JVM/TI StopThread() calls since
// thread is not alive.
break;
}
}
} catch (InterruptedException e) {
throw new Error("Unexpected: " + e);
} catch (NoClassDefFoundError ncdfe) {
// Ignore because we're testing JVM/TI StopThread() which can
// cause it. Yes, a NoClassDefFoundError that happens
// in a worker thread can subsequently be seen in the
// main thread.
}
try {
thread.join();
} catch (InterruptedException e) {
throw new Error("Unexpected: " + e);
}
// This JVM/TI StopThread() happens after the join() so it
// should do nothing, but let's make sure.
retCode = stopThread(thread, new ThreadDeath());
if (retCode != JVMTI_ERROR_THREAD_NOT_ALIVE) {
throw new RuntimeException("thread " + thread.getName()
+ ": stopThread() " +
"retCode=" + retCode +
": unexpected value; " +
"expected JVMTI_ERROR_THREAD_NOT_ALIVE(" +
JVMTI_ERROR_THREAD_NOT_ALIVE + ").");
}
}
System.out.println("Executed " + count + " loops in " + timeMax +
" seconds.");
String cmd = System.getProperty("sun.java.command");
if (cmd != null && !cmd.startsWith("com.sun.javatest.regtest.agent.MainWrapper")) {
// Exit with success in a non-JavaTest environment:
System.exit(0);
}
}
public static void usage() {
System.err.println("Usage: " + PROG_NAME + " [time_max]");
System.err.println("where:");
System.err.println(" time_max max looping time in seconds");
System.err.println(" (default is " + DEF_TIME_MAX +
" seconds)");
System.exit(1);
}
}