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/*
Copyright (c) 2010-2012 250bpm s.r.o.
Copyright (c) 2010-2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads project.
Crossroads 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.
Crossroads 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/>.
*/
#ifndef __XS_POLLER_BASE_HPP_INCLUDED__
#define __XS_POLLER_BASE_HPP_INCLUDED__
#include <map>
#include "fd.hpp"
#include "clock.hpp"
#include "object.hpp"
#include "mailbox.hpp"
#include "atomic_counter.hpp"
namespace xs
{
class ctx_t;
// Handle of a file descriptor within a pollset.
typedef void* handle_t;
// Virtual interface to be exposed by object that want to be notified
// about events on file descriptors.
struct i_poll_events
{
virtual ~i_poll_events () {}
// Called by I/O thread when file descriptor is ready for reading.
virtual void in_event (fd_t fd_) = 0;
// Called by I/O thread when file descriptor is ready for writing.
virtual void out_event (fd_t fd_) = 0;
// Called when timer expires.
virtual void timer_event (handle_t handle_) = 0;
};
class poller_base_t : public object_t, public i_poll_events
{
public:
// Create optimal poller mechanism for this environment.
static poller_base_t *create (xs::ctx_t *ctx_, uint32_t tid_);
virtual ~poller_base_t ();
// Returns load of the poller. Note that this function can be
// invoked from a different thread!
int get_load ();
void start ();
void stop ();
// Returns mailbox associated with this I/O poller.
mailbox_t *get_mailbox ();
virtual handle_t add_fd (fd_t fd_, xs::i_poll_events *events_) = 0;
virtual void rm_fd (handle_t handle_) = 0;
virtual void set_pollin (handle_t handle_) = 0;
virtual void reset_pollin (handle_t handle_) = 0;
virtual void set_pollout (handle_t handle_) = 0;
virtual void reset_pollout (handle_t handle_) = 0;
virtual void xstart () = 0;
virtual void xstop () = 0;
// Add a timeout to expire in timeout_ milliseconds. After the
// expiration timer_event on sink_ object will be called.
handle_t add_timer (int timeout_, xs::i_poll_events *sink_);
// Cancel the timer identified by the handle.
void rm_timer (handle_t handle_);
// i_poll_events implementation.
void in_event (fd_t fd_);
void out_event (fd_t fd_);
void timer_event (handle_t handle_);
protected:
poller_base_t (xs::ctx_t *ctx_, uint32_t tid_);
// Called by individual poller implementations to manage the load.
void adjust_load (int amount_);
// Executes any timers that are due. Returns number of milliseconds
// to wait to match the next timer or 0 meaning "no timers".
uint64_t execute_timers ();
private:
void process_stop ();
// Clock instance private to this I/O thread.
clock_t clock;
// List of active timers.
struct timer_info_t
{
xs::i_poll_events *sink;
std::multimap <uint64_t, timer_info_t>::iterator self;
};
typedef std::multimap <uint64_t, timer_info_t> timers_t;
timers_t timers;
// Load of the poller. Currently the number of file descriptors
// registered.
atomic_counter_t load;
// I/O thread accesses incoming commands via this mailbox.
mailbox_t mailbox;
// Handle associated with mailbox' file descriptor.
handle_t mailbox_handle;
poller_base_t (const poller_base_t&);
const poller_base_t &operator = (const poller_base_t&);
};
}
#endif
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