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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 __ZS_IO_THREAD_HPP_INCLUDED__
+#define __ZS_IO_THREAD_HPP_INCLUDED__
+
+#include <vector>
+
+#include "object.hpp"
+#include "i_thread.hpp"
+#include "i_poller.hpp"
+#include "i_poll_events.hpp"
+#include "fd_signaler.hpp"
+
+namespace zs
+{
+
+ // Generic part of the I/O thread. Polling-mechanism-specific features
+ // are implemented in separate "polling objects".
+
+ class io_thread_t : public object_t, public i_poll_events, public i_thread
+ {
+ public:
+
+ io_thread_t (class dispatcher_t *dispatcher_, int thread_slot_);
+
+ // Launch the physical thread.
+ void start ();
+
+ // Ask underlying thread to stop.
+ void stop ();
+
+ // Wait till undelying thread terminates.
+ void join ();
+
+ // To be called when the whole infrastrucure is being closed (zs_term).
+ // It's vital to call the individual commands in this sequence:
+ // stop, join, shutdown.
+ void shutdown ();
+
+ // Returns signaler associated with this I/O thread.
+ i_signaler *get_signaler ();
+
+ // i_poll_events implementation.
+ void in_event ();
+ void out_event ();
+ void timer_event ();
+
+ // i_thread implementation.
+ void attach_session (class session_t *session_);
+ void detach_session (class session_t *session_);
+ struct i_poller *get_poller ();
+
+ // Command handlers.
+ void process_stop ();
+
+ // Returns load experienced by the I/O thread.
+ int get_load ();
+
+ private:
+
+ // Clean-up.
+ ~io_thread_t ();
+
+ // Poll thread gets notifications about incoming commands using
+ // this signaler.
+ fd_signaler_t signaler;
+
+ // Handle associated with signaler's file descriptor.
+ handle_t signaler_handle;
+
+ // I/O multiplexing is performed using a poller object.
+ i_poller *poller;
+
+ // Vector of all sessions associated with this app thread.
+ typedef std::vector <class session_t*> sessions_t;
+ sessions_t sessions;
+
+ };
+
+}
+
+#endif