prwlock.h

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/*
 *   P::Classes - Portable C++ Application Framework
 *   Copyright (C) 2000-2003  Christian Prochnow <cproch@seculogix.de>
 *
 *   This library is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser 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
 *   Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _prwlock_h_
#define _prwlock_h_

#include <pclasses/pexport.h>
#include <pclasses/pexception.h>

namespace P {


class PCORE_EXPORT RWLock {
  public:

    RWLock(const char* name = 0) throw(SyncError);


    ~RWLock() throw();


    void readLock() throw(SyncError);


    bool tryReadLock(unsigned int timeout) throw(SyncError);


    void writeLock() throw(SyncError);


    bool tryWriteLock(unsigned int timeout) throw(SyncError);

    void unlock() throw(SyncError);


    class ReadLock {
      public:
        inline ReadLock(RWLock& lock)
        : m_lock(lock) { lock.readLock(); }

        ~ReadLock()
        { m_lock.unlock(); }

        ReadLock& operator=(RWLock& mutex)
        {
          m_lock.unlock();
          m_lock = mutex;
          m_lock.readLock();
          return *this;
        }

      private:
        ReadLock(const ReadLock&);
        ReadLock& operator=(const ReadLock&);

        RWLock& m_lock;
    };


    class WriteLock {
      public:
        inline WriteLock(RWLock& lock)
        : m_lock(lock) { lock.writeLock(); }

        ~WriteLock()
        { m_lock.unlock(); }

        WriteLock& operator=(RWLock& mutex)
        {
          m_lock.unlock();
          m_lock = mutex;
          m_lock.writeLock();
          return *this;
        }

      private:
        WriteLock(const WriteLock&);
        WriteLock& operator=(const WriteLock&);

        RWLock& m_lock;
    };
    
  private:
    RWLock(const RWLock&);
    RWLock& operator=(const RWLock&);
  
    struct rwlock_handle_t;
    rwlock_handle_t* m_handle;
};

}

#endif

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