devpoll.cpp 5.04 KB
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/*
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    Copyright (c) 2007-2014 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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#include "devpoll.hpp"
#if defined ZMQ_USE_DEVPOLL
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#include <sys/devpoll.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
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#include <algorithm>
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#include "devpoll.hpp"
#include "err.hpp"
#include "config.hpp"
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#include "i_poll_events.hpp"
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zmq::devpoll_t::devpoll_t (const zmq::ctx_t &ctx_) :
    ctx(ctx_),
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    stopping (false)
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{
    devpoll_fd = open ("/dev/poll", O_RDWR);
    errno_assert (devpoll_fd != -1);
}

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zmq::devpoll_t::~devpoll_t ()
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{
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    worker.stop ();
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    close (devpoll_fd);
}

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void zmq::devpoll_t::devpoll_ctl (fd_t fd_, short events_)
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{
    struct pollfd pfd = {fd_, events_, 0};
    ssize_t rc = write (devpoll_fd, &pfd, sizeof pfd);
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    zmq_assert (rc == sizeof pfd);
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}

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zmq::devpoll_t::handle_t zmq::devpoll_t::add_fd (fd_t fd_,
    i_poll_events *reactor_)
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{
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    //  If the file descriptor table is too small expand it.
    fd_table_t::size_type sz = fd_table.size ();
    if (sz <= (fd_table_t::size_type) fd_) {
        fd_table.resize (fd_ + 1);
        while (sz != (fd_table_t::size_type) (fd_ + 1)) {
            fd_table [sz].valid = false;
            ++sz;
        }
    }

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    zmq_assert (!fd_table [fd_].valid);
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    fd_table [fd_].events = 0;
    fd_table [fd_].reactor = reactor_;
    fd_table [fd_].valid = true;
    fd_table [fd_].accepted = false;

    devpoll_ctl (fd_, 0);
    pending_list.push_back (fd_);

    //  Increase the load metric of the thread.
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    adjust_load (1);
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    return fd_;
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}

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void zmq::devpoll_t::rm_fd (handle_t handle_)
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{
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    zmq_assert (fd_table [handle_].valid);
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    devpoll_ctl (handle_, POLLREMOVE);
    fd_table [handle_].valid = false;
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    //  Decrease the load metric of the thread.
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    adjust_load (-1);
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}

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void zmq::devpoll_t::set_pollin (handle_t handle_)
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{
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    devpoll_ctl (handle_, POLLREMOVE);
    fd_table [handle_].events |= POLLIN;
    devpoll_ctl (handle_, fd_table [handle_].events);
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}

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void zmq::devpoll_t::reset_pollin (handle_t handle_)
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{
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    devpoll_ctl (handle_, POLLREMOVE);
    fd_table [handle_].events &= ~((short) POLLIN);
    devpoll_ctl (handle_, fd_table [handle_].events);
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}

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void zmq::devpoll_t::set_pollout (handle_t handle_)
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{
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    devpoll_ctl (handle_, POLLREMOVE);
    fd_table [handle_].events |= POLLOUT;
    devpoll_ctl (handle_, fd_table [handle_].events);
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}

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void zmq::devpoll_t::reset_pollout (handle_t handle_)
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{
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    devpoll_ctl (handle_, POLLREMOVE);
    fd_table [handle_].events &= ~((short) POLLOUT);
    devpoll_ctl (handle_, fd_table [handle_].events);
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}

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void zmq::devpoll_t::start ()
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{
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    ctx.start_thread (worker, worker_routine, this);
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}

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void zmq::devpoll_t::stop ()
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{
    stopping = true;
}

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int zmq::devpoll_t::max_fds ()
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{
    return -1;
}

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void zmq::devpoll_t::loop ()
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{
    while (!stopping) {

        struct pollfd ev_buf [max_io_events];
        struct dvpoll poll_req;

        for (pending_list_t::size_type i = 0; i < pending_list.size (); i ++)
            fd_table [pending_list [i]].accepted = true;
        pending_list.clear ();

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        //  Execute any due timers.
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        int timeout = (int) execute_timers ();
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        //  Wait for events.
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        //  On Solaris, we can retrieve no more then (OPEN_MAX - 1) events.
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        poll_req.dp_fds = &ev_buf [0];
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#if defined ZMQ_HAVE_SOLARIS
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        poll_req.dp_nfds = std::min ((int) max_io_events, OPEN_MAX - 1);
#else
        poll_req.dp_nfds = max_io_events;
#endif
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        poll_req.dp_timeout = timeout ? timeout : -1;
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        int n = ioctl (devpoll_fd, DP_POLL, &poll_req);
        if (n == -1 && errno == EINTR)
            continue;
        errno_assert (n != -1);

        for (int i = 0; i < n; i ++) {

            fd_entry_t *fd_ptr = &fd_table [ev_buf [i].fd];
            if (!fd_ptr->valid || !fd_ptr->accepted)
                continue;
            if (ev_buf [i].revents & (POLLERR | POLLHUP))
                fd_ptr->reactor->in_event ();
            if (!fd_ptr->valid || !fd_ptr->accepted)
                continue;
            if (ev_buf [i].revents & POLLOUT)
                fd_ptr->reactor->out_event ();
            if (!fd_ptr->valid || !fd_ptr->accepted)
                continue;
            if (ev_buf [i].revents & POLLIN)
                fd_ptr->reactor->in_event ();
        }
    }
}

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void zmq::devpoll_t::worker_routine (void *arg_)
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{
    ((devpoll_t*) arg_)->loop ();
}

#endif