# semaphor.h

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    00001 /*
    00002  * semaphor.h
    00003  *
    00004  * Thread synchronisation semaphore class.
    00005  *
    00006  * Portable Tools Library
    00007  *
    00008  * Copyright (c) 1993-1998 Equivalence Pty. Ltd.
    00009  *
    00010  * The contents of this file are subject to the Mozilla Public License
    00011  * Version 1.0 (the "License"); you may not use this file except in
    00012  * compliance with the License. You may obtain a copy of the License at
    00013  * http://www.mozilla.org/MPL/
    00014  *
    00015  * Software distributed under the License is distributed on an "AS IS"
    00016  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
    00017  * the License for the specific language governing rights and limitations
    00018  * under the License.
    00019  *
    00020  * The Original Code is Portable Windows Library.
    00021  *
    00022  * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
    00023  *
    00024  * Portions are Copyright (C) 1993 Free Software Foundation, Inc.
    00025  * All Rights Reserved.
    00026  *
    00027  * Contributor(s): ______________________________________.
    00028  *
    00029  * $Revision: 24177 $
    00030  * $Author: rjongbloed $
    00031  * $Date: 2010-04-05 06:52:04 -0500 (Mon, 05 Apr 2010) $
    00032  */
    00033
    00034 #ifndef PTLIB_SEMAPHORE_H
    00035 #define PTLIB_SEMAPHORE_H
    00036
    00037 #ifdef P_USE_PRAGMA
    00038 #pragma interface
    00039 #endif
    00040
    00041 #include <ptlib/psync.h>
    00042 #include <limits.h>
    00043 #include <ptlib/critsec.h>
    00044
    00078 class PSemaphore : public PSync
    00079 {
    00080   PCLASSINFO(PSemaphore, PSync);
    00081
    00082   public:
    00089     PSemaphore(
    00090       unsigned initial,
    00091       unsigned maximum
    00092     );
    00093
    00096     PSemaphore(const PSemaphore &);
    00097
    00101     ~PSemaphore();
    00103
    00109     virtual void Wait();
    00110
    00117     virtual PBoolean Wait(
    00118       const PTimeInterval & timeout // Amount of time to wait for semaphore.
    00119     );
    00120
    00125     virtual void Signal();
    00126
    00133     virtual PBoolean WillBlock() const;
    00135
    00136   private:
    00137     PSemaphore & operator=(const PSemaphore &) { return *this; }
    00138
    00139
    00140 // Include platform dependent part of class
    00141 #ifdef _WIN32
    00142 #include "msos/ptlib/semaphor.h"
    00143 #else
    00144 #include "unix/ptlib/semaphor.h"
    00145 #endif
    00146 };
    00147
    00148
    00149 #endif // PTLIB_SEMAPHORE_H
    00150
    00151
    00152 // End Of File ///////////////////////////////////////////////////////////////