poll.hpp 2.57 KB
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/*
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    Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
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    This file is part of 0MQ.

    0MQ is free software; you can redistribute it and/or modify it under
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    the terms of the GNU Lesser General Public License as published by
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    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
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    GNU Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public License
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    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

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#ifndef __ZMQ_POLL_HPP_INCLUDED__
#define __ZMQ_POLL_HPP_INCLUDED__
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//  poller.hpp decides which polling mechanism to use.
#include "poller.hpp"
#if defined ZMQ_USE_POLL
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#include <poll.h>
#include <stddef.h>
#include <vector>

#include "fd.hpp"
#include "thread.hpp"
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#include "poller_base.hpp"
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namespace zmq
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{

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    struct i_poll_events;

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    //  Implements socket polling mechanism using the POSIX.1-2001
    //  poll() system call.

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    class poll_t : public poller_base_t
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    {
    public:

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        typedef fd_t handle_t;

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        poll_t ();
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        ~poll_t ();
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        //  "poller" concept.
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        handle_t add_fd (fd_t fd_, zmq::i_poll_events *events_);
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        void rm_fd (handle_t handle_);
        void set_pollin (handle_t handle_);
        void reset_pollin (handle_t handle_);
        void set_pollout (handle_t handle_);
        void reset_pollout (handle_t handle_);
        void start ();
        void stop ();

    private:

        //  Main worker thread routine.
        static void worker_routine (void *arg_);

        //  Main event loop.
        void loop ();

        struct fd_entry_t
        {
            fd_t index;
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            zmq::i_poll_events *events;
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        };

        //  This table stores data for registered descriptors.
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        typedef std::vector <fd_entry_t> fd_table_t;
        fd_table_t fd_table;
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        //  Pollset to pass to the poll function.
        typedef std::vector <pollfd> pollset_t;
        pollset_t pollset;

        //  If true, there's at least one retired event source.
        bool retired;

        //  If true, thread is in the process of shutting down.
        bool stopping;

        //  Handle of the physical thread doing the I/O work.
        thread_t worker;

        poll_t (const poll_t&);
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        const poll_t &operator = (const poll_t&);
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    };

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    typedef poll_t poller_t;

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}

#endif

#endif