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/*
* Copyright (C) 2011 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.
*/
package java.lang;
import android.system.Os;
import android.system.OsConstants;
import dalvik.system.VMRuntime;
import java.lang.ref.FinalizerReference;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.TimeoutException;
import libcore.util.EmptyArray;
/**
* Calls Object.finalize() on objects in the finalizer reference queue. The VM
* will abort if any finalize() call takes more than the maximum finalize time
* to complete.
*
* @hide
*/
public final class Daemons {
private static final int NANOS_PER_MILLI = 1000 * 1000;
private static final int NANOS_PER_SECOND = NANOS_PER_MILLI * 1000;
private static final long MAX_FINALIZE_NANOS = 10L * NANOS_PER_SECOND;
public static void start() {
ReferenceQueueDaemon.INSTANCE.start();
FinalizerDaemon.INSTANCE.start();
FinalizerWatchdogDaemon.INSTANCE.start();
HeapTaskDaemon.INSTANCE.start();
}
public static void startPostZygoteFork() {
ReferenceQueueDaemon.INSTANCE.startPostZygoteFork();
FinalizerDaemon.INSTANCE.startPostZygoteFork();
FinalizerWatchdogDaemon.INSTANCE.startPostZygoteFork();
HeapTaskDaemon.INSTANCE.startPostZygoteFork();
}
public static void stop() {
HeapTaskDaemon.INSTANCE.stop();
ReferenceQueueDaemon.INSTANCE.stop();
FinalizerDaemon.INSTANCE.stop();
FinalizerWatchdogDaemon.INSTANCE.stop();
}
/**
* A background task that provides runtime support to the application.
* Daemons can be stopped and started, but only so that the zygote can be a
* single-threaded process when it forks.
*/
private static abstract class Daemon implements Runnable {
private Thread thread;
private String name;
private boolean postZygoteFork;
protected Daemon(String name) {
this.name = name;
}
public synchronized void start() {
startInternal();
}
public synchronized void startPostZygoteFork() {
postZygoteFork = true;
startInternal();
}
public void startInternal() {
if (thread != null) {
throw new IllegalStateException("already running");
}
thread = new Thread(ThreadGroup.systemThreadGroup, this, name);
thread.setDaemon(true);
thread.start();
}
public void run() {
if (postZygoteFork) {
// We don't set the priority before the Thread.start() call above because
// Thread.start() will call SetNativePriority and overwrite the desired native
// priority. We (may) use a native priority that doesn't have a corresponding
// java.lang.Thread-level priority (native priorities are more coarse-grained.)
VMRuntime.getRuntime().setSystemDaemonThreadPriority();
}
runInternal();
}
public abstract void runInternal();
/**
* Returns true while the current thread should continue to run; false
* when it should return.
*/
protected synchronized boolean isRunning() {
return thread != null;
}
public synchronized void interrupt() {
interrupt(thread);
}
public synchronized void interrupt(Thread thread) {
if (thread == null) {
throw new IllegalStateException("not running");
}
thread.interrupt();
}
/**
* Waits for the runtime thread to stop. This interrupts the thread
* currently running the runnable and then waits for it to exit.
*/
public void stop() {
Thread threadToStop;
synchronized (this) {
threadToStop = thread;
thread = null;
}
if (threadToStop == null) {
throw new IllegalStateException("not running");
}
interrupt(threadToStop);
while (true) {
try {
threadToStop.join();
return;
} catch (InterruptedException ignored) {
} catch (OutOfMemoryError ignored) {
// An OOME may be thrown if allocating the InterruptedException failed.
}
}
}
/**
* Returns the current stack trace of the thread, or an empty stack trace
* if the thread is not currently running.
*/
public synchronized StackTraceElement[] getStackTrace() {
return thread != null ? thread.getStackTrace() : EmptyArray.STACK_TRACE_ELEMENT;
}
}
/**
* This heap management thread moves elements from the garbage collector's
* pending list to the managed reference queue.
*/
private static class ReferenceQueueDaemon extends Daemon {
private static final ReferenceQueueDaemon INSTANCE = new ReferenceQueueDaemon();
ReferenceQueueDaemon() {
super("ReferenceQueueDaemon");
}
@Override public void runInternal() {
while (isRunning()) {
Reference list;
try {
synchronized (ReferenceQueue.class) {
while (ReferenceQueue.unenqueued == null) {
ReferenceQueue.class.wait();
}
list = ReferenceQueue.unenqueued;
ReferenceQueue.unenqueued = null;
}
} catch (InterruptedException e) {
continue;
} catch (OutOfMemoryError e) {
continue;
}
ReferenceQueue.enqueuePending(list);
}
}
}
private static class FinalizerDaemon extends Daemon {
private static final FinalizerDaemon INSTANCE = new FinalizerDaemon();
private final ReferenceQueue