DwmPthreadReadWriteLock.hh

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//===========================================================================
// @(#) $DwmPath: dwm/libDwm/tags/libDwm-0.6.0/include/DwmPthreadReadWriteLock.hh 8401 $
// @(#) $Id: DwmPthreadReadWriteLock.hh 8401 2016-04-17 06:44:31Z dwm $
//===========================================================================
//  Copyright (c) Daniel W. McRobb 1998-2007
//  All rights reserved.
//
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//  modification, are permitted provided that the following conditions
//  are met:
//
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//     notice, this list of conditions and the following disclaimer.
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//  3. The names of the authors and copyright holders may not be used to
//     endorse or promote products derived from this software without
//     specific prior written permission.
//
//  IN NO EVENT SHALL DANIEL W. MCROBB BE LIABLE TO ANY PARTY FOR
//  DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
//  INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE,
//  EVEN IF DANIEL W. MCROBB HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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//===========================================================================

//---------------------------------------------------------------------------
//---------------------------------------------------------------------------

#ifndef _PTHREADREADWRITELOCK_HH_
#define _PTHREADREADWRITELOCK_HH_

extern "C" {
  #include <errno.h>
  #include <pthread.h>
}

namespace Dwm {

  namespace Pthread {

    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    class ReadWriteLock
    {
    public:
      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      ReadWriteLock(const pthread_rwlockattr_t *attr = 0);
     
      ReadWriteLock(const ReadWriteLock & rwlock);
     
      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      ~ReadWriteLock();
     
      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      bool ReadLock();
     
      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      int TryReadLock();
     
      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      bool WriteLock();
     
      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      int TryWriteLock();
     
      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      bool Unlock();
     
    private:
      pthread_rwlock_t             _lock;
      const pthread_rwlockattr_t  *_attr;
    };
    
  }  // namespace Pthread

}  // namespace Dwm

#endif  // _PTHREADREADWRITELOCK_HH_

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