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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 <algorithm>
#include "../include/zmq.h"
#if defined ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#else
#include <unistd.h>
#endif
#include "app_thread.hpp"
#include "i_api.hpp"
#include "dispatcher.hpp"
#include "err.hpp"
#include "pipe.hpp"
#include "config.hpp"
#include "socket_base.hpp"
// If the RDTSC is available we use it to prevent excessive
// polling for commands. The nice thing here is that it will work on any
// system with x86 architecture and gcc or MSVC compiler.
#if (defined __GNUC__ && (defined __i386__ || defined __x86_64__)) ||\
(defined _MSC_VER && (defined _M_IX86 || defined _M_X64))
#define ZMQ_DELAY_COMMANDS
#endif
zmq::app_thread_t::app_thread_t (dispatcher_t *dispatcher_, int thread_slot_) :
object_t (dispatcher_, thread_slot_),
tid (0),
last_processing_time (0)
{
}
zmq::app_thread_t::~app_thread_t ()
{
// Destroy all the sockets owned by this application thread.
for (sockets_t::iterator it = sockets.begin (); it != sockets.end (); it ++)
delete *it;
}
zmq::i_signaler *zmq::app_thread_t::get_signaler ()
{
return &pollset;
}
bool zmq::app_thread_t::is_current ()
{
return !sockets.empty () && tid == getpid ();
}
bool zmq::app_thread_t::make_current ()
{
// If there are object managed by this slot we cannot assign the slot
// to a different thread.
if (!sockets.empty ())
return false;
tid = getpid ();
return true;
}
void zmq::app_thread_t::process_commands (bool block_)
{
ypollset_t::signals_t signals;
if (block_)
signals = pollset.poll ();
else {
#if defined ZMQ_DELAY_COMMANDS
// Optimised version of command processing - it doesn't have to check
// for incoming commands each time. It does so only if certain time
// elapsed since last command processing. Command delay varies
// depending on CPU speed: It's ~1ms on 3GHz CPU, ~2ms on 1.5GHz CPU
// etc. The optimisation makes sense only on platforms where getting
// a timestamp is a very cheap operation (tens of nanoseconds).
// Get timestamp counter.
#if defined __GNUC__
uint32_t low;
uint32_t high;
__asm__ volatile ("rdtsc" : "=a" (low), "=d" (high));
uint64_t current_time = (uint64_t) high << 32 | low;
#elif defined _MSC_VER
uint64_t current_time = __rdtsc ();
#else
#error
#endif
// Check whether certain time have elapsed since last command
// processing.
if (current_time - last_processing_time <= max_command_delay)
return;
last_processing_time = current_time;
#endif
// Check whether there are any commands pending for this thread.
signals = pollset.check ();
}
if (signals) {
// Traverse all the possible sources of commands and process
// all the commands from all of them.
for (int i = 0; i != thread_slot_count (); i++) {
if (signals & (ypollset_t::signals_t (1) << i)) {
command_t cmd;
while (dispatcher->read (i, get_thread_slot (), &cmd))
cmd.destination->process_command (cmd);
}
}
}
}
zmq::i_api *zmq::app_thread_t::create_socket (int type_)
{
// TODO: type is ignored for the time being.
socket_base_t *s = new socket_base_t (this);
zmq_assert (s);
sockets.push_back (s);
return s;
}
void zmq::app_thread_t::remove_socket (i_api *socket_)
{
// TODO: To speed this up we can possibly use the system where each socket
// holds its index (see I/O scheduler implementation).
sockets_t::iterator it = std::find (sockets.begin (), sockets.end (),
socket_);
zmq_assert (it != sockets.end ());
sockets.erase (it);
}
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