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RawThread.java
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RawThread.java
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/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Common Public License (CPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/cpl1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.mmtk.harness.scheduler.rawthreads;
import org.mmtk.harness.MMTkThread;
import org.mmtk.harness.lang.Trace;
import org.mmtk.harness.lang.Trace.Item;
import org.mmtk.harness.scheduler.Policy;
import org.mmtk.harness.scheduler.Scheduler;
/**
* An MMTk thread in the RawThreads model
*/
class RawThread extends MMTkThread {
/**
*
*/
private final RawThreadModel model;
/** The command-line configurable yield policy */
private final Policy yieldPolicy = Scheduler.yieldPolicy(this);
/** True if this thread is exiting */
private boolean exiting = false;
/** The ordinal (for a rendezvous) */
private int ordinal = 0;
/** Is this thread current ? Used to filter spurious wade-ups */
private boolean isCurrent = false;
public RawThread(RawThreadModel model) {
this.model = model;
}
protected void end() {
this.exiting = true;
}
synchronized void resumeThread() {
assert !exiting;
Trace.trace(Item.SCHEDULER, "%d: resumeThread", getId());
isCurrent = true;
model.setCurrent(this);
notify();
}
synchronized void yieldThread() {
isCurrent = false;
Trace.trace(Item.SCHEDULER, "%d: yieldThread", getId());
model.wakeScheduler();
waitTillCurrent();
Trace.trace(Item.SCHEDULER, "%d: resuming", getId());
}
boolean yieldPolicy() {
return yieldPolicy.yieldNow();
}
void setOrdinal(int ordinal) {
this.ordinal = ordinal;
}
int getOrdinal() {
return ordinal;
}
protected synchronized void waitTillCurrent() {
Trace.trace(Item.SCHEDULER, "%d: waiting for thread wakeup", getId());
while (!isCurrent) {
try {
this.wait();
} catch (InterruptedException e) {
}
}
}
}