thread_cancellation.hpp

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/*********************************************************************/
// dar - disk archive - a backup/restoration program
// Copyright (C) 2002-2052 Denis Corbin
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//
// to contact the author : http://dar.linux.free.fr/email.html
/*********************************************************************/


#ifndef THREAD_CANCELLATION_HPP
#define THREAD_CANCELLATION_HPP

#include "../my_config.h"

extern "C"
{
#if MUTEX_WORKS
#if HAVE_PTHREAD_H
#include <pthread.h>
#endif
#endif
}
#include <list>
#include "integers.hpp"

namespace libdar
{



    class thread_cancellation
    {
    public:

        thread_cancellation();

        virtual ~thread_cancellation();


        void check_self_cancellation() const;


        void block_delayed_cancellation(bool mode);



        static void init();


#if MUTEX_WORKS


        static void cancel(pthread_t tid, bool x_immediate, U_64 x_flag);


        static bool cancel_status(pthread_t tid);


        static bool clear_pending_request(pthread_t tid);
#endif

        static U_I count()
        {
#if MUTEX_WORKS
            return info.size();
#else
            return 0;
#endif
        };

#if MUTEX_WORKS
    private:

            // class types

        struct fields
        {
            pthread_t tid;             
            bool block_delayed;        
            bool immediate;            
            bool cancellation;         
            U_64 flag;                 
        };

            // object information

        fields status;

            // class's static variables and types

        static pthread_mutex_t access;                 
        static bool initialized;                       
        static std::list<thread_cancellation *> info;  
        static std::list<fields> preborn;              

#endif
    };

} // end of namespace

#endif