--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/EDU/oswego/cs/dl/util/concurrent/WaitableBoolean.java	Sat Mar 21 11:00:06 2009 +0000
@@ -0,0 +1,127 @@
+/*
+  File: WaitableBoolean.java
+
+  Originally written by Doug Lea and released into the public domain.
+  This may be used for any purposes whatsoever without acknowledgment.
+  Thanks for the assistance and support of Sun Microsystems Labs,
+  and everyone contributing, testing, and using this code.
+
+  History:
+  Date       Who                What
+  19Jun1998  dl               Create public version
+*/
+
+package EDU.oswego.cs.dl.util.concurrent;
+
+/**
+ * A class useful for offloading synch for boolean instance variables.
+ *
+ * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>]
+ **/
+
+public class WaitableBoolean extends SynchronizedBoolean {
+
+  /** Make a new WaitableBoolean with the given initial value **/
+  public WaitableBoolean(boolean initialValue) { super(initialValue); }
+
+
+  /** 
+   * Make a new WaitableBoolean with the given initial value,
+   * and using the supplied lock.
+   **/
+  public WaitableBoolean(boolean initialValue, Object lock) { 
+    super(initialValue, lock); 
+  }
+
+
+  public boolean set(boolean newValue) { 
+    synchronized (lock_) {
+      lock_.notifyAll();
+      return super.set(newValue);
+    }
+  }
+
+  public boolean commit(boolean assumedValue, boolean newValue) {
+    synchronized (lock_) {
+      boolean success = super.commit(assumedValue, newValue);
+      if (success) lock_.notifyAll();
+      return success;
+    }
+  }
+
+  public  boolean complement() { 
+    synchronized (lock_) {
+      lock_.notifyAll();
+      return super.complement();
+    }
+  }
+
+  public  boolean and(boolean b) { 
+    synchronized (lock_) {
+      lock_.notifyAll();
+      return super.and(b);
+    }
+  }
+
+  public  boolean or(boolean b) { 
+    synchronized (lock_) {
+      lock_.notifyAll();
+      return super.or(b);
+    }
+  }
+
+  public  boolean xor(boolean b) { 
+    synchronized (lock_) {
+      lock_.notifyAll();
+      return super.xor(b);
+    }
+  }
+
+  /**
+   * Wait until value is false, then run action if nonnull.
+   * The action is run with the synchronization lock held.
+   **/
+
+  public  void whenFalse(Runnable action) throws InterruptedException {
+    synchronized (lock_) {
+      while (value_) lock_.wait();
+      if (action != null) action.run();
+    }
+  }
+
+  /**
+   * wait until value is true, then run action if nonnull.
+   * The action is run with the synchronization lock held.
+   **/
+  public  void whenTrue(Runnable action) throws InterruptedException {
+    synchronized (lock_) {
+      while (!value_) lock_.wait();
+      if (action != null) action.run();
+    }
+  }
+
+  /**
+   * Wait until value equals c, then run action if nonnull.
+   * The action is run with the synchronization lock held.
+   **/
+
+  public  void whenEqual(boolean c, Runnable action) throws InterruptedException {
+    synchronized (lock_) {
+      while (!(value_ == c)) lock_.wait();
+      if (action != null) action.run();
+    }
+  }
+
+  /**
+   * wait until value not equal to c, then run action if nonnull.
+   * The action is run with the synchronization lock held.
+   **/
+  public  void whenNotEqual(boolean c, Runnable action) throws InterruptedException {
+    synchronized (lock_) {
+      while (!(value_ != c)) lock_.wait();
+      if (action != null) action.run();
+    }
+  }
+
+}
+