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/* poller.cpp
* Copyright (C) 2005 Tommi Maekitalo
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* is provided AS IS, WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, and
* NON-INFRINGEMENT. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "tnt/poller.h"
#include "tnt/tntnet.h"
#include <cxxtools/log.h>
#include <unistd.h>
#include <fcntl.h>
log_define("tntnet.poller")
namespace tnt
{
Poller::Poller(Jobqueue& q)
: queue(q),
poll_timeout(-1)
{
pipe(notify_pipe);
fcntl(notify_pipe[0], F_SETFL, O_NONBLOCK);
pollfds.reserve(16);
pollfds[0].fd = notify_pipe[0];
pollfds[0].events = POLLIN;
pollfds[0].revents = 0;
}
void Poller::append_new_jobs()
{
cxxtools::MutexLock lock(mutex);
if (!new_jobs.empty())
{
// append new jobs to current
log_debug("add " << new_jobs.size() << " new jobs to poll-list");
pollfds.reserve(current_jobs.size() + new_jobs.size() + 1);
time_t currentTime;
time(¤tTime);
for (jobs_type::iterator it = new_jobs.begin();
it != new_jobs.end(); ++it)
{
append(*it);
int msec;
if (poll_timeout < 0)
poll_timeout = (*it)->msecToTimeout(currentTime);
else if ((msec = (*it)->msecToTimeout(currentTime)) < poll_timeout)
poll_timeout = msec;
}
new_jobs.clear();
}
}
void Poller::append(Jobqueue::JobPtr& job)
{
current_jobs.push_back(job);
pollfd& p = *(pollfds.data() + current_jobs.size());
p.fd = job->getFd();
p.events = POLLIN;
}
void Poller::run()
{
while (!Tntnet::shouldStop())
{
append_new_jobs();
try
{
log_debug("poll timeout=" << poll_timeout);
::poll(pollfds.data(), current_jobs.size() + 1, poll_timeout);
if (Tntnet::shouldStop())
{
log_warn("stop poller");
break;
}
poll_timeout = -1;
if (pollfds[0].revents != 0)
{
log_debug("read notify-pipe");
char ch;
::read(notify_pipe[0], &ch, 1);
pollfds[0].revents = 0;
}
dispatch();
}
catch (const std::exception& e)
{
log_error("error in poll-loop: " << e.what());
}
}
}
void Poller::doStop()
{
log_debug("notify stop");
char ch = 'A';
::write(notify_pipe[1], &ch, 1);
}
void Poller::dispatch()
{
log_debug("dispatch " << current_jobs.size() << " jobs");
time_t currentTime;
time(¤tTime);
for (unsigned i = 0; i < current_jobs.size(); )
{
if (pollfds[i + 1].revents & POLLIN)
{
log_debug("job found " << pollfds[i + 1].fd);
// put job into work-queue
queue.put(current_jobs[i]);
remove(i);
}
else if (pollfds[i + 1].revents != 0)
{
log_debug("pollevent " << std::hex << pollfds[i + 1].revents << " on fd " << pollfds[i + 1].fd);
remove(i);
}
else
{
// check timeout
int msec = current_jobs[i]->msecToTimeout(currentTime);
if (msec <= 0)
{
log_debug("keep-alive-timeout reached");
remove(i);
}
else if (poll_timeout < 0 || msec < poll_timeout)
poll_timeout = msec;
++i;
}
}
}
void Poller::remove(jobs_type::size_type n)
{
// replace job with last job in poller-list
jobs_type::size_type last = current_jobs.size() - 1;
if (n != last)
{
pollfds[n + 1] = pollfds[last + 1];
current_jobs[n] = current_jobs[last];
}
current_jobs.pop_back();
}
void Poller::addIdleJob(Jobqueue::JobPtr job)
{
log_debug("addIdleJob " << job->getFd());
{
cxxtools::MutexLock lock(mutex);
new_jobs.push_back(job);
}
log_debug("notify " << job->getFd());
char ch = 'A';
::write(notify_pipe[1], &ch, 1);
log_debug("addIdleJob ready");
}
}
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