it_bus_pdk/fair_rw_lock.h

#ifndef _IT_BUS_PDK_FAIR_RW_LOCK_H_
#define _IT_BUS_PDK_FAIR_RW_LOCK_H_

// @Copyright (c) 2003 IONA Technologies PLC. All Rights Reserved.
//

#include <it_ts/mutex.h>
#include <it_ts/gateway.h>
#include <it_bus/api_defines.h>

namespace IT_Bus
{
    class IT_AFC_API FairRWLock
    {
      public:

        FairRWLock();

        void lock_write();

        void cancel_write();

        void lock_read();

        void cancel_read();

      protected:

        size_t m_readers;

        IT_Gateway m_write_gateway;

        IT_Mutex m_read_lock;

        IT_Mutex m_lock;
    };



    class IT_AFC_API ReadLocker
    {
      public:

        ReadLocker(FairRWLock & lock);
        ~ReadLocker();

        void lock();
        void cancel();

      private:

        FairRWLock & m_lock;
        bool m_has_lock;
    };


    class IT_AFC_API WriteLocker
    {
      public:

        WriteLocker(FairRWLock & lock);
        ~WriteLocker();

        void lock();
        void cancel();

      private:

        FairRWLock & m_lock;
        bool m_has_lock;
    };
}

#endif  

---