ThreadLocalState.java

/*
 *  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.ppc;

import org.jikesrvm.runtime.Magic;
import org.jikesrvm.scheduler.RVMThread;
import org.vmmagic.pragma.Inline;
import org.vmmagic.pragma.Uninterruptible;

/**
 * This class provides a layer of abstraction that the rest of the VM must
 * use in order to access the current <code>RVMThread</code> object.
 *
 * @see RVMThread
 */
@Uninterruptible
public abstract class ThreadLocalState {

  /**
   * The C bootstrap program has placed a pointer to the initial
   * Thread in the thread register.  This is OK, so do nothing.
   */
  public static void boot() {
    // do nothing - everything is already set up.
  }

  /**
   * Return the current RVMThread object
   */
  @Inline
  public static RVMThread getCurrentThread() {
    return Magic.getThreadRegister();
  }

  /**
   * Set the current thread object
   */
  @Inline
  public static void setCurrentThread(RVMThread p) {
    Magic.setThreadRegister(p);
  }
}