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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_DISPATCHER_HPP_INCLUDED__
-#define __ZMQ_DISPATCHER_HPP_INCLUDED__
-
-#include <vector>
-#include <set>
-#include <map>
-#include <string>
-
-#include "signaler.hpp"
-#include "ypipe.hpp"
-#include "config.hpp"
-#include "mutex.hpp"
-#include "stdint.hpp"
-#include "thread.hpp"
-
-namespace zmq
-{
-
- class dispatcher_t
- {
- public:
-
- // Create the dispatcher object. The argument specifies the size
- // of I/O thread pool to create.
- dispatcher_t (uint32_t io_threads_);
-
- // This function is called when user invokes zmq_term. If there are
- // no more sockets open it'll cause all the infrastructure to be shut
- // down. If there are open sockets still, the deallocation happens
- // after the last one is closed.
- int term ();
-
- // Create a socket.
- class socket_base_t *create_socket (int type_);
-
- // Destroy a socket.
- void destroy_socket ();
-
- // Called by app_thread_t when it has no more sockets. The function
- // should disassociate the object from the current OS thread.
- void no_sockets (class app_thread_t *thread_);
-
- // Send command to the destination thread.
- void send_command (uint32_t destination_, const command_t &command_);
-
- // Receive command from another thread.
- bool recv_command (uint32_t thread_slot_, command_t *command_,
- bool block_);
-
- // Returns the I/O thread that is the least busy at the moment.
- // Taskset specifies which I/O threads are eligible (0 = all).
- class io_thread_t *choose_io_thread (uint64_t taskset_);
-
- // All pipes are registered with the dispatcher so that even the
- // orphaned pipes can be deallocated on the terminal shutdown.
- void register_pipe (class pipe_t *pipe_);
- void unregister_pipe (class pipe_t *pipe_);
-
- // Management of inproc endpoints.
- int register_endpoint (const char *addr_, class socket_base_t *socket_);
- void unregister_endpoints (class socket_base_t *socket_);
- class socket_base_t *find_endpoint (const char *addr_);
-
- private:
-
- ~dispatcher_t ();
-
- struct app_thread_info_t
- {
- // If false, 0MQ application thread is free, there's no associated
- // OS thread.
- bool associated;
-
- // ID of the associated OS thread. If 'associated' is false,
- // this field contains bogus data.
- thread_t::id_t tid;
-
- // Pointer to the 0MQ application thread object.
- class app_thread_t *app_thread;
- };
-
- // Application threads.
- typedef std::vector <app_thread_info_t> app_threads_t;
- app_threads_t app_threads;
-
- // Synchronisation of accesses to shared application thread data.
- mutex_t app_threads_sync;
-
- // I/O threads.
- typedef std::vector <class io_thread_t*> io_threads_t;
- io_threads_t io_threads;
-
- // Array of pointers to signalers for both application and I/O threads.
- int signalers_count;
- signaler_t **signalers;
-
- // As pipes may reside in orphaned state in particular moments
- // of the pipe shutdown process, i.e. neither pipe reader nor
- // pipe writer hold reference to the pipe, we have to hold references
- // to all pipes in dispatcher so that we can deallocate them
- // during terminal shutdown even though it conincides with the
- // pipe being in the orphaned state.
- typedef std::set <class pipe_t*> pipes_t;
- pipes_t pipes;
-
- // Synchronisation of access to the pipes repository.
- mutex_t pipes_sync;
-
- // Number of sockets alive.
- int sockets;
-
- // If true, zmq_term was already called. When last socket is closed
- // the whole 0MQ infrastructure should be deallocated.
- bool terminated;
-
- // Synchronisation of access to the termination data (socket count
- // and 'terminated' flag).
- mutex_t term_sync;
-
- // List of inproc endpoints within this context.
- typedef std::map <std::string, class socket_base_t*> endpoints_t;
- endpoints_t endpoints;
-
- // Synchronisation of access to the list of inproc endpoints.
- mutex_t endpoints_sync;
-
- dispatcher_t (const dispatcher_t&);
- void operator = (const dispatcher_t&);
- };
-
-}
-
-#endif
-