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/*
Copyright (c) 2007-2011 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser 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
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "platform.hpp"
#include <string.h>
#include <algorithm>
#ifdef ZMQ_HAVE_WINDOWS
#include "winsock2.h"
#elif defined ZMQ_HAVE_HPUX
#include <sys/param.h>
#include <sys/types.h>
#include <sys/time.h>
#elif defined ZMQ_HAVE_OPENVMS
#include <sys/types.h>
#include <sys/time.h>
#else
#include <sys/select.h>
#endif
#include "select.hpp"
#include "err.hpp"
#include "config.hpp"
#include "i_poll_events.hpp"
zmq::select_t::select_t () :
maxfd (retired_fd),
retired (false),
stopping (false)
{
// Clear file descriptor sets.
FD_ZERO (&source_set_in);
FD_ZERO (&source_set_out);
FD_ZERO (&source_set_err);
}
zmq::select_t::~select_t ()
{
worker.stop ();
}
zmq::select_t::handle_t zmq::select_t::add_fd (fd_t fd_, i_poll_events *events_)
{
// Store the file descriptor.
fd_entry_t entry = {fd_, events_};
fds.push_back (entry);
// Ensure we do not attempt to select () on more than FD_SETSIZE
// file descriptors.
zmq_assert (fds.size () <= FD_SETSIZE);
// Start polling on errors.
FD_SET (fd_, &source_set_err);
// Adjust maxfd if necessary.
if (fd_ > maxfd)
maxfd = fd_;
// Increase the load metric of the thread.
adjust_load (1);
return fd_;
}
void zmq::select_t::rm_fd (handle_t handle_)
{
// Mark the descriptor as retired.
fd_set_t::iterator it;
for (it = fds.begin (); it != fds.end (); ++it)
if (it->fd == handle_)
break;
zmq_assert (it != fds.end ());
it->fd = retired_fd;
retired = true;
// Stop polling on the descriptor.
FD_CLR (handle_, &source_set_in);
FD_CLR (handle_, &source_set_out);
FD_CLR (handle_, &source_set_err);
// Discard all events generated on this file descriptor.
FD_CLR (handle_, &readfds);
FD_CLR (handle_, &writefds);
FD_CLR (handle_, &exceptfds);
// Adjust the maxfd attribute if we have removed the
// highest-numbered file descriptor.
if (handle_ == maxfd) {
maxfd = retired_fd;
for (fd_set_t::iterator it = fds.begin (); it != fds.end (); ++it)
if (it->fd > maxfd)
maxfd = it->fd;
}
// Decrease the load metric of the thread.
adjust_load (-1);
}
void zmq::select_t::set_pollin (handle_t handle_)
{
FD_SET (handle_, &source_set_in);
}
void zmq::select_t::reset_pollin (handle_t handle_)
{
FD_CLR (handle_, &source_set_in);
}
void zmq::select_t::set_pollout (handle_t handle_)
{
FD_SET (handle_, &source_set_out);
}
void zmq::select_t::reset_pollout (handle_t handle_)
{
FD_CLR (handle_, &source_set_out);
}
void zmq::select_t::start ()
{
worker.start (worker_routine, this);
}
void zmq::select_t::stop ()
{
stopping = true;
}
void zmq::select_t::loop ()
{
while (!stopping) {
// Execute any due timers.
int timeout = (int) execute_timers ();
// Intialise the pollsets.
memcpy (&readfds, &source_set_in, sizeof source_set_in);
memcpy (&writefds, &source_set_out, sizeof source_set_out);
memcpy (&exceptfds, &source_set_err, sizeof source_set_err);
// Wait for events.
struct timeval tv = {(long) (timeout / 1000),
(long) (timeout % 1000 * 1000)};
#ifdef ZMQ_HAVE_WINDOWS
int rc = select (0, &readfds, &writefds, &exceptfds,
timeout ? &tv : NULL);
wsa_assert (rc != SOCKET_ERROR);
#else
int rc = select (maxfd + 1, &readfds, &writefds, &exceptfds,
timeout ? &tv : NULL);
if (rc == -1 && errno == EINTR)
continue;
errno_assert (rc != -1);
#endif
// If there are no events (i.e. it's a timeout) there's no point
// in checking the pollset.
if (rc == 0)
continue;
for (fd_set_t::size_type i = 0; i < fds.size (); i ++) {
if (fds [i].fd == retired_fd)
continue;
if (FD_ISSET (fds [i].fd, &exceptfds))
fds [i].events->in_event ();
if (fds [i].fd == retired_fd)
continue;
if (FD_ISSET (fds [i].fd, &writefds))
fds [i].events->out_event ();
if (fds [i].fd == retired_fd)
continue;
if (FD_ISSET (fds [i].fd, &readfds))
fds [i].events->in_event ();
}
// Destroy retired event sources.
if (retired) {
fds.erase (std::remove_if (fds.begin (), fds.end (),
zmq::select_t::is_retired_fd), fds.end ());
retired = false;
}
}
}
void zmq::select_t::worker_routine (void *arg_)
{
((select_t*) arg_)->loop ();
}
bool zmq::select_t::is_retired_fd (const fd_entry_t &entry)
{
return (entry.fd == retired_fd);
}
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