/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Eclipse Public License (EPL);
* 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/eclipse-1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.jikesrvm.compilers.opt.runtimesupport;
import org.jikesrvm.scheduler.RVMThread;
import org.vmmagic.pragma.Uninterruptible;
/**
* A visitor that is used to request synchronization of processor caches
* after code patching has taken place.
* <p>
* Garbage collection threads are exempt from the need to respond to soft
* handshakes in the current implementation. This is safe because garbage
* collection threads will never be executing code that is subject to code
* patching. (We don't allow speculative optimization of uninterruptible code).
*/
@Uninterruptible
class CodePatchSyncRequestVisitor extends RVMThread.SoftHandshakeVisitor {
/**
* Signals the given thread to sync for code patching.
* @return {@code true} because this visitor is interested in all
* mutator threads
*/
@Override
public boolean checkAndSignal(RVMThread t) {
t.codePatchSyncRequested = true;
return true;
}
}