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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/>.
*/
#include "../include/zmq.h"
#include "dispatcher.hpp"
#include "i_api.hpp"
#include "app_thread.hpp"
#include "io_thread.hpp"
#include "platform.hpp"
#include "err.hpp"
#include "pipe.hpp"
#if defined ZMQ_HAVE_WINDOWS
#include "windows.h"
#endif
zmq::dispatcher_t::dispatcher_t (int app_threads_, int io_threads_)
{
#ifdef ZMQ_HAVE_WINDOWS
// Intialise Windows sockets. Note that WSAStartup can be called multiple
// times given that WSACleanup will be called for each WSAStartup.
WORD version_requested = MAKEWORD (2, 2);
WSADATA wsa_data;
int rc = WSAStartup (version_requested, &wsa_data);
zmq_assert (rc == 0);
zmq_assert (LOBYTE (wsa_data.wVersion) == 2 &&
HIBYTE (wsa_data.wVersion) == 2);
#endif
// Create application thread proxies.
for (int i = 0; i != app_threads_; i++) {
app_thread_t *app_thread = new app_thread_t (this, i);
zmq_assert (app_thread);
app_threads.push_back (app_thread);
signalers.push_back (app_thread->get_signaler ());
}
// Create I/O thread objects.
for (int i = 0; i != io_threads_; i++) {
io_thread_t *io_thread = new io_thread_t (this, i + app_threads_);
zmq_assert (io_thread);
io_threads.push_back (io_thread);
signalers.push_back (io_thread->get_signaler ());
}
// Create command pipe matrix.
command_pipes = new command_pipe_t [signalers.size () * signalers.size ()];
zmq_assert (command_pipes);
// Launch I/O threads.
for (int i = 0; i != io_threads_; i++)
io_threads [i]->start ();
}
zmq::dispatcher_t::~dispatcher_t ()
{
// Close all application theads, sockets, io_objects etc.
for (app_threads_t::size_type i = 0; i != app_threads.size (); i++)
delete app_threads [i];
// Ask I/O threads to terminate. If stop signal wasn't sent to I/O
// thread subsequent invocation of destructor would hang-up.
for (io_threads_t::size_type i = 0; i != io_threads.size (); i++)
io_threads [i]->stop ();
// Wait till I/O threads actually terminate.
for (io_threads_t::size_type i = 0; i != io_threads.size (); i++)
delete io_threads [i];
delete [] command_pipes;
#ifdef ZMQ_HAVE_WINDOWS
// On Windows, uninitialise socket layer.
int rc = WSACleanup ();
wsa_assert (rc != SOCKET_ERROR);
#endif
}
int zmq::dispatcher_t::thread_slot_count ()
{
return signalers.size ();
}
zmq::i_api *zmq::dispatcher_t::create_socket (int type_)
{
threads_sync.lock ();
app_thread_t *thread = choose_app_thread ();
if (!thread) {
threads_sync.unlock ();
return NULL;
}
threads_sync.unlock ();
return thread->create_socket (type_);
}
zmq::app_thread_t *zmq::dispatcher_t::choose_app_thread ()
{
// Check whether thread ID is already assigned. If so, return it.
for (app_threads_t::size_type i = 0; i != app_threads.size (); i++)
if (app_threads [i]->is_current ())
return app_threads [i];
// Check whether there's an unused thread slot in the cotext.
for (app_threads_t::size_type i = 0; i != app_threads.size (); i++)
if (app_threads [i]->make_current ())
return app_threads [i];
// Thread limit was exceeded.
errno = EMFILE;
return NULL;
}
zmq::io_thread_t *zmq::dispatcher_t::choose_io_thread (uint64_t taskset_)
{
zmq_assert (io_threads.size () > 0);
// Find the I/O thread with minimum load.
int min_load = io_threads [0]->get_load ();
io_threads_t::size_type result = 0;
for (io_threads_t::size_type i = 1; i != io_threads.size (); i++) {
if (!taskset_ || (taskset_ & (uint64_t (1) << i))) {
int load = io_threads [i]->get_load ();
if (load < min_load) {
min_load = load;
result = i;
}
}
}
return io_threads [result];
}
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