CASemaphore.hpp

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/*
Copyright (c) 2000, The JAP-Team 
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are permitted provided that the following conditions are met:

  - Redistributions of source code must retain the above copyright notice, 
    this list of conditions and the following disclaimer.

  - Redistributions in binary form must reproduce the above copyright notice, 
    this list of conditions and the following disclaimer in the documentation and/or 
    other materials provided with the distribution.

  - Neither the name of the University of Technology Dresden, Germany nor the names of its contributors 
    may be used to endorse or promote products derived from this software without specific 
    prior written permission. 

  
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS 
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS
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*/
#ifndef __CASEMAPHORE__
#define __CASEMAPHORE__

#ifdef USE_SEMAPHORE
class CASemaphore
  {
    public:
      CASemaphore()
        {
          m_pSemaphore=new sem_t;
          sem_init(m_pSemaphore,0,0);
        }
      
      CASemaphore(int iInitialValue)
        {
          m_pSemaphore=new sem_t;
          sem_init(m_pSemaphore,0,iInitialValue);
        }

      ~CASemaphore()
        {
          sem_destroy(m_pSemaphore);
          delete m_pSemaphore;
          m_pSemaphore = NULL;
        }

      SINT32 up()
        {
          if(sem_post(m_pSemaphore)>=0)
            return E_SUCCESS;
          return E_UNKNOWN;
        }

      SINT32 down()
        {
          SINT32 ret;
          while((ret=sem_wait(m_pSemaphore))==E_AGAIN);
          if(ret==0)
            return E_SUCCESS;
          return E_UNKNOWN;
        }
    
    private:
      sem_t* m_pSemaphore;
  };
#endif
#endif