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diff --git a/dep/include/zthread/Cancelable.h b/dep/include/zthread/Cancelable.h
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+/*
+ * Copyright (c) 2005, Eric Crahen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is furnished
+ * to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __ZTCANCELABLE_H__
+#define __ZTCANCELABLE_H__
+
+#include "zthread/Exceptions.h"
+
+namespace ZThread {
+
+  /**
+   * @class Cancelable
+   *
+   * @author Eric Crahen <http://www.code-foo.com>
+   * @date <2003-07-16T09:28:46-0400>
+   * @version 2.3.0
+   *
+   * The Cancelable interface defines a common method of adding general <i>disable-and-exit</i>
+   * semantics to some object. By cancel()ing a Cancelable object, a request is
+   * made to disable that object. 
+   *
+   * <b>Disabling</b>
+   *
+   * A cancel()ed object may not necessarily abort it work immediately. Often, it much more
+   * elegant for a cancel()ed object to complete handling whatever responsibilities have 
+   * been assigned to it, but it will <i>not</i> take on any new responsibility. 
+   *
+   * <b>Exiting</b>
+   *
+   * A cancel()ed should complete its responsibilities as soon as possible.
+   * Canceling is not only a request to stop taking on new responsibility, and to
+   * complete its current responsibility. Its also a request to complete dealing with its 
+   * current responsibilities, quickly when possible. 
+   */
+  class Cancelable {
+  public:
+
+    //! Destroy a Cancelable object.
+    virtual ~Cancelable() {}
+
+    /**
+     * Canceling a Cancelable object makes a request to disable that object. 
+     * This entails refusing to take on any new responsibility, and completing 
+     * its current responsibilities quickly.
+     *
+     * Canceling an object more than once has no effect.
+     * 
+     * @post The Cancelable object will have permanently transitioned to a 
+     *       disabled state; it will now refuse to accept new responsibility. 
+     */
+    virtual void cancel() = 0;
+
+    /**
+     * Determine if a Cancelable object has been canceled.
+     *
+     * @return 
+     *   - <em>true</em> if cancel() was called prior to this function.
+     *   - <em>false</em> otherwise.
+     */
+    virtual bool isCanceled() = 0;
+
+  }; /* Cancelable */
+
+
+} // namespace ZThread
+
+#endif // __ZTCANCELABLE_H__