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diff --git a/dep/src/zthread/State.h b/dep/src/zthread/State.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 __ZTSTATE_H__
+#define __ZTSTATE_H__
+
+namespace ZThread {
+
+/**
+ * @class State 
+ * @author Eric Crahen <http://www.code-foo.com>
+ * @date <2003-07-16T20:04:01-0400>
+ * @version 2.2.1
+ *
+ * Class to encapsulate the current state of the threads life-cycle.
+ */
+class State {
+ public:
+
+  //! Various states
+  typedef enum { REFERENCE, IDLE, RUNNING, JOINED } STATE;
+
+  /**
+   * Create State with the given flag set.
+   */
+  State(STATE initialState) : _state(initialState) {}
+
+  /**
+   * Test for the IDLE state. No task has yet run.
+   */
+  bool isIdle() const {
+    return _state == IDLE;
+  }
+
+  /**
+   * Test for the JOINED state. A task has completed and 
+   * the thread is join()ed.
+   *
+   * @return bool
+   */
+  bool isJoined() const {
+    return _state == JOINED;
+  }
+
+  /**
+   * Test for the RUNNING state. A task is in progress.
+   *
+   * @return bool
+   */
+  bool isRunning() const {
+    return _state == RUNNING;
+  }
+
+  /**
+   * Test for the REFERENCE state. A task is in progress but not
+   * under control of this library.
+   *
+   * @return bool
+   */
+  bool isReference() const {
+    return _state == REFERENCE;
+  }
+
+  /**
+   * Transition to the IDLE state.
+   *
+   * @return bool true if successful
+   */
+  bool setIdle() {
+
+    if(_state != RUNNING)
+      return false;
+
+    _state = IDLE;
+    return true;
+
+  }
+
+  /**
+   * Transition to the RUNNING state.
+   *
+   * @return bool true if successful
+   */
+  bool setRunning() {
+
+    if(_state != IDLE)
+      return false;
+
+    _state = RUNNING;
+    return true;
+
+  }
+
+  /**
+   * Transition to the REFERENCE state.
+   *
+   * @return bool true if successful
+   */
+  bool setReference() {
+
+    if(_state != IDLE)
+      return false;
+
+    _state = REFERENCE;
+    return true;
+
+  }
+
+
+  /**
+   * Transition to the JOINED state.
+   *
+   * @return bool true if successful
+   */
+  bool setJoined() {
+
+    _state = JOINED;
+    return true;
+
+  }
+
+ private:
+
+  //! Current state
+  STATE _state;
+
+};
+
+
+};
+
+#endif