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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/>.
*/
#include <new>
#include <algorithm>
#include "../include/zmq.h"
#include "platform.hpp"
#if defined ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#if defined _MSC_VER
#include <intrin.h>
#endif
#else
#include <unistd.h>
#endif
#include "app_thread.hpp"
#include "ctx.hpp"
#include "err.hpp"
#include "pipe.hpp"
#include "config.hpp"
#include "socket_base.hpp"
#include "pair.hpp"
#include "pub.hpp"
#include "sub.hpp"
#include "req.hpp"
#include "rep.hpp"
#include "xreq.hpp"
#include "xrep.hpp"
#include "upstream.hpp"
#include "downstream.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 (ctx_t *ctx_,
uint32_t thread_slot_) :
object_t (ctx_, thread_slot_),
last_processing_time (0),
terminated (false)
{
}
zmq::app_thread_t::~app_thread_t ()
{
zmq_assert (sockets.empty ());
}
void zmq::app_thread_t::stop ()
{
send_stop ();
}
zmq::signaler_t *zmq::app_thread_t::get_signaler ()
{
return &signaler;
}
bool zmq::app_thread_t::process_commands (bool block_, bool throttle_)
{
bool received;
command_t cmd;
if (block_) {
received = signaler.recv (&cmd, true);
zmq_assert (received);
}
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).
if (throttle_) {
// 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 !terminated;
last_processing_time = current_time;
}
#endif
// Check whether there are any commands pending for this thread.
received = signaler.recv (&cmd, false);
}
// Process all the commands available at the moment.
while (received) {
cmd.destination->process_command (cmd);
received = signaler.recv (&cmd, false);
}
return !terminated;
}
zmq::socket_base_t *zmq::app_thread_t::create_socket (int type_)
{
socket_base_t *s = NULL;
switch (type_) {
case ZMQ_PAIR:
s = new (std::nothrow) pair_t (this);
break;
case ZMQ_PUB:
s = new (std::nothrow) pub_t (this);
break;
case ZMQ_SUB:
s = new (std::nothrow) sub_t (this);
break;
case ZMQ_REQ:
s = new (std::nothrow) req_t (this);
break;
case ZMQ_REP:
s = new (std::nothrow) rep_t (this);
break;
case ZMQ_XREQ:
s = new (std::nothrow) xreq_t (this);
break;
case ZMQ_XREP:
s = new (std::nothrow) xrep_t (this);
break;
case ZMQ_UPSTREAM:
s = new (std::nothrow) upstream_t (this);
break;
case ZMQ_DOWNSTREAM:
s = new (std::nothrow) downstream_t (this);
break;
default:
if (sockets.empty ())
get_ctx ()->no_sockets (this);
errno = EINVAL;
return NULL;
}
zmq_assert (s);
sockets.push_back (s);
return s;
}
void zmq::app_thread_t::remove_socket (socket_base_t *socket_)
{
sockets.erase (socket_);
if (sockets.empty ())
get_ctx ()->no_sockets (this);
}
void zmq::app_thread_t::process_stop ()
{
terminated = true;
}
bool zmq::app_thread_t::is_terminated ()
{
return terminated;
}
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