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/*
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_I_POLLER_HPP_INCLUDED__
#define __ZMQ_I_POLLER_HPP_INCLUDED__
#include "fd.hpp"
namespace zmq
{
union handle_t
{
fd_t fd;
void *ptr;
};
// Virtual interface to be used when polling on file descriptors.
struct i_poller
{
virtual ~i_poller () {};
// Add file descriptor to the polling set. Return handle
// representing the descriptor. 'events' interface will be used
// to invoke callback functions when event occurs.
virtual handle_t add_fd (fd_t fd_, struct i_poll_events *events_) = 0;
// Remove file descriptor identified by handle from the polling set.
virtual void rm_fd (handle_t handle_) = 0;
// Start polling for input from socket.
virtual void set_pollin (handle_t handle_) = 0;
// Stop polling for input from socket.
virtual void reset_pollin (handle_t handle_) = 0;
// Start polling for availability of the socket for writing.
virtual void set_pollout (handle_t handle_) = 0;
// Stop polling for availability of the socket for writing.
virtual void reset_pollout (handle_t handle_) = 0;
// Ask to be notified after some time. Actual interval varies between
// 0 and max_timer_period ms. Timer is destroyed once it expires or,
// optionally, when cancel_timer is called.
virtual void add_timer (struct i_poll_events *events_) = 0;
// Cancel the timer set by add_timer method.
virtual void cancel_timer (struct i_poll_events *events_) = 0;
// Returns load experienced by the I/O thread. Currently it's number
// of file descriptors handled by the poller, in the future we may
// use a metric taking actual traffic on the individual sockets into
// account.
virtual int get_load () = 0;
// Start the execution of the underlying I/O thread.
// This method is called from a foreign thread.
virtual void start () = 0;
// Ask underlying I/O thread to stop.
virtual void stop () = 0;
};
}
#endif
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