CriticalSection.h++

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/* ---------------------------------------------------------------------------
   commonc++ - A C++ Common Class Library
   Copyright (C) 2005-2012  Mark A Lindner

   This file is part of commonc++.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   ---------------------------------------------------------------------------
*/

#ifndef __ccxx_CriticalSection_hxx
#define __ccxx_CriticalSection_hxx

#include <commonc++/Common.h++>
#include <commonc++/Lock.h++>
#ifndef CCXX_OS_WINDOWS
#include <commonc++/AtomicCounter.h++>
#include <commonc++/ThreadLocalCounter.h++>
#include <commonc++/Random.h++>
#endif

namespace ccxx {

class COMMONCPP_API CriticalSection : public Lock
{
  public:

  CriticalSection() throw();

  ~CriticalSection() throw();

  void enter() throw();

  inline void lock() throw()
  { enter(); }

  bool tryEnter() throw();

  void leave() throw();

  inline void unlock() throw()
  { leave(); }

  private:

#ifdef CCXX_OS_WINDOWS
  CRITICAL_SECTION _lock;
#else
  AtomicCounter _lock;
  ThreadLocalCounter _counter;
  Random _rand;
#endif
};

}; // namespace ccxx

#endif // __ccxx_CriticalSection_hxx

/* end of header file */