semaphore.h

这是DVD中伺服部分的核心代码

/******************************************************************************
*******************************************************************************
**                                                                           **
**  Copyright (c) 2006 Videon Central, Inc.                                  **
**  All rights reserved.                                                     **
**                                                                           **
**  The computer program contained herein contains proprietary information   **
**  which is the property of Videon Central, Inc.  The program may be used   **
**  and/or copied only with the written permission of Videon Central, Inc.   **
**  or in accordance with the terms and conditions stipulated in the         **
**  agreement/contract under which the programs have been supplied.          **
**                                                                           **
*******************************************************************************
******************************************************************************/
/**
 * @file semaphore.h
 *
 * $Revision: 1.3 $ 
 *
 * Wraps the osapi binary and counting semaphores as a referenced object
 * Binary Semaphores are slightly different in functionally from the base
 * implementation in osapi - it does not consider signaling an already
 * signaled semaphore an error.
 */

#ifndef __SEMAPHORE_H
#define __SEMAPHORE_H

    #include "reference_counter.h"
    #include "vcitypes.h"
    #include "osapi.h"



    class Semaphore : public ReferenceCounter
    {
        protected:
            OS_SEM_ID           semaphoreHandle;

            virtual VDVD_ERROR  Construct   ( void )=0;
            VDVD_ERROR          Destruct    ( void );
           

        public:

                            Semaphore   ( void );

            VDVD_ERROR      Create      ( void );
            VDVD_ERROR      Destroy     ( void );
            VDVD_ERROR      Wait        ( void );
            VDVD_ERROR      Wait        ( uint32 timeoutInMilliseconds );
            VDVD_ERROR      Signal      ( void );
    };






    class BinarySemaphore : public Semaphore
    {
        private:
            VDVD_ERROR      Construct      ( void );

    };






    class CountingSemaphore : public Semaphore
    {
        private:
            VDVD_ERROR      Construct      ( void );
    };



#endif