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TraceWriteBuffer.java
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/
TraceWriteBuffer.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.plan;
import org.mmtk.utility.deque.WriteBuffer;
import org.vmmagic.pragma.*;
import org.vmmagic.unboxed.*;
/**
* This class is used to push values in one direction during a trace. It
* was designed for use in mutators that use write barriers to push
* work to collector threads during concurrent tracing.
*
* @see org.mmtk.plan.TraceLocal
*/
@Uninterruptible
public final class TraceWriteBuffer extends TransitiveClosure {
/****************************************************************************
*
* Instance variables
*/
private final WriteBuffer buffer;
/****************************************************************************
*
* Initialization
*/
/**
* Constructor
*
* @param trace The global trace class to use.
*/
public TraceWriteBuffer(Trace trace) {
buffer = new WriteBuffer(trace.valuePool);
}
/**
* Flush the buffer to the trace.
*/
public void flush() {
buffer.flushLocal();
}
/**
* @return True if the buffer is flushed.
*/
public boolean isFlushed() {
return buffer.isFlushed();
}
/**
* Enqueue an object during a trace.
*
* @param object The object to enqueue
*/
@Inline
public void processNode(ObjectReference object) {
buffer.insert(object.toAddress());
}
}