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/*
Copyright (c) 2007-2010 iMatix Corporation
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_SELECT_HPP_INCLUDED__
#define __ZMQ_SELECT_HPP_INCLUDED__
#include "platform.hpp"
#include <stddef.h>
#include <vector>
#ifdef ZMQ_HAVE_WINDOWS
#include "winsock2.h"
#elif defined ZMQ_HAVE_OPENVMS
#include <sys/types.h>
#include <sys/time.h>
#else
#include <sys/select.h>
#endif
#include "fd.hpp"
#include "thread.hpp"
#include "atomic_counter.hpp"
namespace zmq
{
// Implements socket polling mechanism using POSIX.1-2001 select()
// function.
class select_t
{
public:
typedef fd_t handle_t;
select_t ();
~select_t ();
// "poller" concept.
handle_t add_fd (fd_t fd_, struct i_poll_events *events_);
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 add_timer (struct i_poll_events *events_);
void cancel_timer (struct i_poll_events *events_);
int get_load ();
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 fd;
struct i_poll_events *events;
};
// Set of file descriptors that are used to retreive
// information for fd_set.
typedef std::vector <fd_entry_t> fd_set_t;
fd_set_t fds;
fd_set source_set_in;
fd_set source_set_out;
fd_set source_set_err;
fd_set readfds;
fd_set writefds;
fd_set exceptfds;
// Maximum file descriptor.
fd_t maxfd;
// If true, at least one file descriptor has retired.
bool retired;
// List of all the engines waiting for the timer event.
typedef std::vector <struct i_poll_events*> timers_t;
timers_t timers;
// If true, thread is shutting down.
bool stopping;
// Handle of the physical thread doing the I/O work.
thread_t worker;
// Load of the poller. Currently number of file descriptors
// registered with the poller.
atomic_counter_t load;
select_t (const select_t&);
void operator = (const select_t&);
};
}
#endif
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