semaphor.h

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/*
 * semaphor.h
 *
 * Thread synchronisation semaphore class.
 *
 * Portable Tools Library
 *
 * Copyright (c) 1993-1998 Equivalence Pty. Ltd.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Portable Windows Library.
 *
 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
 *
 * Portions are Copyright (C) 1993 Free Software Foundation, Inc.
 * All Rights Reserved.
 *
 * Contributor(s): ______________________________________.
 *
 * $Revision: 20986 $
 * $Author: rjongbloed $
 * $Date: 2008-09-15 12:01:50 +0000 (Mon, 15 Sep 2008) $
 */

#ifndef _PSEMAPHORE
#define _PSEMAPHORE

#ifdef P_USE_PRAGMA
#pragma interface
#endif

#include <ptlib/psync.h>
#include <limits.h>
#include <ptlib/critsec.h>

class PSemaphore : public PSync
{
  PCLASSINFO(PSemaphore, PSync);

  public:
    PSemaphore(
      unsigned initial, 
      unsigned maximum  
    );

    PSemaphore(const PSemaphore &);

    ~PSemaphore();

    virtual void Wait();

    virtual PBoolean Wait(
      const PTimeInterval & timeout // Amount of time to wait for semaphore.
    );

    virtual void Signal();

    virtual PBoolean WillBlock() const;

  private:
    PSemaphore & operator=(const PSemaphore &) { return *this; }


// Include platform dependent part of class
#ifdef _WIN32
#include "msos/ptlib/semaphor.h"
#else
#include "unix/ptlib/semaphor.h"
#endif
};

#endif

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