/*

 * Copyright 2001 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

#ifndef _MONITOR_

#define _MONITOR_

#include <windows.h>

class Monitor {

public:

  Monitor();

  ~Monitor();

  void lock();

  void unlock();

  // Default time is forever (i.e, zero). Returns true if it times-out, otherwise

  // false.

  bool wait(long timeout = 0);

  bool notify();

  bool notifyAll();

private:

  HANDLE owner();

  void setOwner(HANDLE owner);

  bool ownedBySelf();

  HANDLE _owner;

  long   _lock_count;

  HANDLE _lock_event;   // Auto-reset event for blocking in lock()

  HANDLE _wait_event;   // Manual-reset event for notifications

  long _counter;        // Current number of notifications

  long _waiters;        // Number of threads waiting for notification

  long _tickets;        // Number of waiters to be notified

};

#endif  // #defined _MONITOR_