libzmq/src/command.hpp

/*
    Copyright (c) 2007-2009 FastMQ Inc.

    This file is part of 0MQ.

    0MQ is free software; you can redistribute it and/or modify it under
    the terms of the Lesser GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    0MQ 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
    Lesser GNU General Public License for more details.

    You should have received a copy of the Lesser GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef __ZMQ_COMMAND_HPP_INCLUDED__
#define __ZMQ_COMMAND_HPP_INCLUDED__

#include "stdint.hpp"

namespace zmq
{

    //  This structure defines the commands that can be sent between threads.

    struct command_t
    {
        //  Object to process the command.
        class object_t *destination;

        enum type_t
        {
            stop,
            plug,
            own,
            bind,
            term_req,
            term,
            term_ack

        } type;

        union {

            //  Sent to I/O thread to let it know that it should
            //  terminate itself.
            struct {
            } stop;

            //  Sent to I/O object to make it register with its I/O thread.
            struct {
            } plug;

            //  Sent to socket to let it know about the newly created object.
            struct {
                class object_t *object;
            } own;

            //  Sent between objects to establish pipe(s) between them.
            struct {
            } bind;

            //  Sent by I/O object ot the socket to request the shutdown of
            //  the I/O object.
            struct {
                class object_t *object;
            } term_req;

            //  Sent by socket to I/O object to start its shutdown.
            struct {
            } term;

            //  Sent by I/O object to the socket to acknowledge it has
            //  shut down.
            struct {
            } term_ack;

        } args;
    };

}    

#endif