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117 lines (108 loc) · 4.29 KB
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/*
* Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
*
* Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
* that is described in this document. In particular, and without limitation, these intellectual property
* rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
* more additional patents or pending patent applications in the U.S. and in other countries.
*
* U.S. Government Rights - Commercial software. Government users are subject to the Sun
* Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
* supplements.
*
* Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
* registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
* are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
* U.S. and other countries.
*
* UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
* Company, Ltd.
*/
package com.sun.max.util;
import java.util.concurrent.*;
import com.sun.max.*;
import com.sun.max.lang.*;
import com.sun.max.program.*;
/**
* Compute given functions in always one and the same single thread.
*
* This is for example necessary in Linux where one and
* the same thread needs to be reused to represent the whole process in certain contexts,
* e.g. when using the ptrace interface.
*
* @author Bernd Mathiske
* @author Doug Simon
*/
public class SingleThread extends Thread {
private static Thread worker;
private static final ExecutorService executorService = Executors.newSingleThreadExecutor(new ThreadFactory() {
public Thread newThread(Runnable runnable) {
ProgramError.check(worker == null, "Single worker thread died unexpectedly");
worker = new Thread(runnable);
worker.setName("SingleThread");
return worker;
}
});
private static final boolean disabled = false;
public static <V> V execute(Function<V> function) {
if (disabled || Thread.currentThread() == worker) {
try {
return function.call();
} catch (Exception exception) {
ProgramError.unexpected(exception);
}
}
synchronized (executorService) {
final Future<V> future = executorService.submit(function);
while (true) {
try {
return future.get();
} catch (ExecutionException e) {
throw Utils.cast(RuntimeException.class, e.getCause());
} catch (InterruptedException exception) {
// continue
}
}
}
}
public static <V> V executeWithException(Function<V> function) throws Exception {
if (disabled || Thread.currentThread() == worker) {
return function.call();
}
synchronized (executorService) {
final Future<V> future = executorService.submit(function);
while (true) {
try {
return future.get();
} catch (ExecutionException e) {
final Throwable cause = e.getCause();
if (cause instanceof Exception) {
throw (Exception) cause;
}
ProgramError.unexpected(cause);
} catch (InterruptedException exception) {
// continue
}
}
}
}
public static void execute(final Runnable runnable) {
if (disabled || Thread.currentThread() == worker) {
runnable.run();
}
synchronized (executorService) {
final Future<?> future = executorService.submit(runnable);
while (true) {
try {
future.get();
return;
} catch (ExecutionException e) {
final Throwable cause = e.getCause();
ProgramError.unexpected(cause);
} catch (InterruptedException exception) {
// continue
}
}
}
}
}