/*
|
* Copyright (C) 2007 The Android Open Source Project
|
*
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
* you may not use this file except in compliance with the License.
|
* You may obtain a copy of the License at
|
*
|
* http://www.apache.org/licenses/LICENSE-2.0
|
*
|
* Unless required by applicable law or agreed to in writing, software
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
* See the License for the specific language governing permissions and
|
* limitations under the License.
|
*/
|
|
import dalvik.system.VMRuntime;
|
import java.util.concurrent.CountDownLatch;
|
import static java.util.concurrent.TimeUnit.MINUTES;
|
|
/**
|
* Test a class with a bad finalizer.
|
*
|
* This test is inherently flaky. It assumes that the system will schedule the finalizer daemon
|
* and finalizer watchdog daemon enough to reach the timeout and throwing the fatal exception.
|
*/
|
public class Main {
|
public static void main(String[] args) throws Exception {
|
CountDownLatch finalizerWait = new CountDownLatch(1);
|
|
// A separate method to ensure no dex register keeps the object alive.
|
createBadFinalizer(finalizerWait);
|
|
// Should have at least two iterations to trigger finalization, but just to make sure run
|
// some more.
|
for (int i = 0; i < 5; i++) {
|
Runtime.getRuntime().gc();
|
}
|
|
// Now wait for the finalizer to start running. Give it a minute.
|
finalizerWait.await(1, MINUTES);
|
|
// Now fall asleep with a timeout. The timeout is large enough that we expect the
|
// finalizer daemon to have killed the process before the deadline elapses.
|
// The timeout is also large enough to cover the extra 5 seconds we wait
|
// to dump threads, plus potentially substantial gcstress overhead.
|
// Note: the timeout is here (instead of an infinite sleep) to protect the test
|
// environment (e.g., in case this is run without a timeout wrapper).
|
final long timeout = 100 * 1000 + VMRuntime.getRuntime().getFinalizerTimeoutMs();
|
long remainingWait = timeout;
|
final long waitStart = System.currentTimeMillis();
|
while (remainingWait > 0) {
|
synchronized (args) { // Just use an already existing object for simplicity...
|
try {
|
args.wait(remainingWait);
|
} catch (Exception e) {
|
}
|
}
|
remainingWait = timeout - (System.currentTimeMillis() - waitStart);
|
}
|
|
// We should not get here.
|
System.out.println("UNREACHABLE");
|
System.exit(0);
|
}
|
|
private static void createBadFinalizer(CountDownLatch finalizerWait) {
|
BadFinalizer bf = new BadFinalizer(finalizerWait);
|
|
System.out.println("About to null reference.");
|
bf = null; // Not that this would make a difference, could be eliminated earlier.
|
}
|
|
public static void snooze(int ms) {
|
try {
|
Thread.sleep(ms);
|
} catch (InterruptedException ie) {
|
}
|
}
|
|
/**
|
* Class with a bad finalizer.
|
*/
|
public static class BadFinalizer {
|
private CountDownLatch finalizerWait;
|
private volatile int j = 0; // Volatile in an effort to curb loop optimization.
|
|
public BadFinalizer(CountDownLatch finalizerWait) {
|
this.finalizerWait = finalizerWait;
|
}
|
|
protected void finalize() {
|
finalizerWait.countDown();
|
|
System.out.println("Finalizer started and spinning...");
|
|
/* spin for a bit */
|
long start, end;
|
start = System.nanoTime();
|
snooze(2000);
|
end = System.nanoTime();
|
System.out.println("Finalizer done spinning.");
|
|
System.out.println("Finalizer sleeping forever now.");
|
while (true) {
|
snooze(10000);
|
}
|
}
|
}
|
}
|
