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