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diff --git a/dep/include/zthread/Semaphore.h b/dep/include/zthread/Semaphore.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 __ZTSEMAPHORE_H__
+#define __ZTSEMAPHORE_H__
+
+#include "zthread/Lockable.h"
+#include "zthread/NonCopyable.h"
+
+namespace ZThread {
+  
+  class FifoSemaphoreImpl;
+ 
+  /**
+   * @class Semaphore
+   * @author Eric Crahen <http://www.code-foo.com>
+   * @date <2003-07-16T15:28:01-0400>
+   * @version 2.2.1
+   *
+   * A Semaphore is an owner-less Lockable object. Its probably best described as 
+   * a set of 'permits'. A Semaphore is initialized with an initial count and
+   * a maximum count, these would correspond to the number of 'permits' currently
+   * available and the number of' permits' in total.
+   *
+   * - Acquiring the Semaphore means taking a permit, but if there are none
+   *   (the count is 0) the Semaphore will block the calling thread.
+   *
+   * - Releasing the Semaphore means returning a permit, unblocking a thread 
+   *   waiting for one.
+   *
+   * A Semaphore with an initial value of 1 and maximum value of 1 will act as 
+   * a Mutex.
+   *
+   * Threads blocked on a Semaphore are resumed in FIFO order.
+   *
+   */
+  class ZTHREAD_API Semaphore : public Lockable, private NonCopyable {
+  
+    FifoSemaphoreImpl* _impl;
+  
+  public:
+  
+    /**
+     * Create a new Semaphore. 
+     *
+     * @param count initial count
+     * @param maxCount maximum count
+     */
+    Semaphore(int count = 1, unsigned int maxCount = 1); 
+
+    //! Destroy the Semaphore
+    virtual ~Semaphore();
+
+    /**
+     * <i>Provided to reflect the traditional Semaphore semantics</i>
+     *
+     * @see acquire()
+     */ 
+    void wait(); 
+
+
+    /**
+     * <i>Provided to reflect the traditional Semaphore semantics</i>
+     *
+     * @see tryAcquire(unsigned long timeout)
+     */
+    bool tryWait(unsigned long timeout); 
+
+    /**
+     * <i>Provided to reflect the traditional Semaphore semantics</i>
+     *
+     * @see release()
+     */
+    void post(); 
+
+  
+    /**
+     * Get the current count of the semaphore. 
+     *
+     * This value may change immediately after this function returns to the calling thread.
+     *
+     * @return <em>int</em> count
+     */
+    virtual int count(); 
+
+    /**
+     * Decrement the count, blocking that calling thread if the count becomes 0 or 
+     * less than 0. The calling thread will remain blocked until the count is 
+     * raised above 0, an exception is thrown or the given amount of time expires.
+     * 
+     * @param timeout maximum amount of time (milliseconds) this method could block
+     * 
+     * @return 
+     *   - <em>true</em> if the Semaphore was acquired before <i>timeout</i> milliseconds elapse.
+     *   - <em>false</em> otherwise.
+     *
+     * @exception Interrupted_Exception thrown when the calling thread is interrupted.
+     *            A thread may be interrupted at any time, prematurely ending any wait.
+     * 
+     * @see Lockable::tryAcquire(unsigned long timeout)
+     */
+    virtual bool tryAcquire(unsigned long timeout); 
+ 
+
+    /**
+     * Decrement the count, blocking that calling thread if the count becomes 0 or 
+     * less than 0. The calling thread will remain blocked until the count is 
+     * raised above 0 or if an exception is thrown.
+     * 
+     * @exception Interrupted_Exception thrown when the calling thread is interrupted.
+     *            A thread may be interrupted at any time, prematurely ending any wait.
+     * 
+     * @see Lockable::acquire()
+     */
+    virtual void acquire();
+
+    /**
+     * Increment the count, unblocking one thread if count is positive.
+     *
+     * @exception InvalidOp_Exception thrown if the maximum count would be exceeded.
+     * 
+     * @see Lockable::release()
+     */
+    virtual void release();
+  
+  }; 
+
+
+} // namespace ZThread
+
+#endif // __ZTSEMAPHORE_H__