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/*
Copyright (c) 2010-2012 250bpm s.r.o.
Copyright (c) 2010-2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads I/O project.
Crossroads I/O is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Crossroads 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
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "io_thread.hpp"
#include "err.hpp"
#include "select.hpp"
#include "poll.hpp"
#include "epoll.hpp"
#include "devpoll.hpp"
#include "kqueue.hpp"
xs::io_thread_t *xs::io_thread_t::create (xs::ctx_t *ctx_, uint32_t tid_)
{
io_thread_t *result;
#if defined XS_HAVE_SELECT
result = new (std::nothrow) select_t (ctx_, tid_);
#elif defined XS_HAVE_POLL
result = new (std::nothrow) poll_t (ctx_, tid_);
#elif defined XS_HAVE_EPOLL
result = new (std::nothrow) epoll_t (ctx_, tid_);
#elif defined XS_HAVE_DEVPOLL
result = new (std::nothrow) devpoll_t (ctx_, tid_);
#elif defined XS_HAVE_KQUEUE
result = new (std::nothrow) kqueue_t (ctx_, tid_);
#endif
alloc_assert (result);
return result;
}
xs::io_thread_t::io_thread_t (xs::ctx_t *ctx_, uint32_t tid_) :
object_t (ctx_, tid_)
{
int rc = mailbox_init (&mailbox);
errno_assert (rc == 0);
}
xs::io_thread_t::~io_thread_t ()
{
mailbox_close (&mailbox);
}
void xs::io_thread_t::start ()
{
mailbox_handle = add_fd (mailbox_fd (&mailbox), this);
set_pollin (mailbox_handle);
xstart ();
}
void xs::io_thread_t::stop ()
{
// Ask the I/O thread to stop.
send_stop ();
}
void xs::io_thread_t::process_stop ()
{
rm_fd (mailbox_handle);
xstop ();
}
xs::mailbox_t *xs::io_thread_t::get_mailbox ()
{
return &mailbox;
}
int xs::io_thread_t::get_load ()
{
return load.get ();
}
void xs::io_thread_t::adjust_load (int amount_)
{
if (amount_ > 0)
load.add (amount_);
else if (amount_ < 0)
load.sub (-amount_);
}
xs::handle_t xs::io_thread_t::add_timer (int timeout_, i_poll_events *sink_)
{
uint64_t expiration = clock.now_ms () + timeout_;
timer_info_t info = {sink_, timers_t::iterator ()};
timers_t::iterator it = timers.insert (
timers_t::value_type (expiration, info));
it->second.self = it;
return (handle_t) &(it->second);
}
void xs::io_thread_t::rm_timer (handle_t handle_)
{
timer_info_t *info = (timer_info_t*) handle_;
timers.erase (info->self);
}
uint64_t xs::io_thread_t::execute_timers ()
{
// Fast track.
if (timers.empty ())
return 0;
// Get the current time.
uint64_t current = clock.now_ms ();
// Execute the timers that are already due.
timers_t::iterator it = timers.begin ();
while (it != timers.end ()) {
// If we have to wait to execute the item, same will be true about
// all the following items (multimap is sorted). Thus we can stop
// checking the subsequent timers and return the time to wait for
// the next timer (at least 1ms).
if (it->first > current)
return it->first - current;
// Trigger the timer.
it->second.sink->timer_event ((handle_t) &it->second);
// Remove it from the list of active timers.
timers_t::iterator o = it;
++it;
timers.erase (o);
}
// There are no more timers.
return 0;
}
void xs::io_thread_t::in_event (fd_t fd_)
{
// TODO: Do we want to limit number of commands I/O thread can
// process in a single go?
while (true) {
// Get the next command. If there is none, exit.
command_t cmd;
int rc = mailbox_recv (&mailbox, &cmd, 0);
if (rc != 0 && errno == EINTR)
continue;
if (rc != 0 && errno == EAGAIN)
break;
errno_assert (rc == 0);
// Process the command.
cmd.destination->process_command (cmd);
}
}
void xs::io_thread_t::out_event (fd_t fd_)
{
// We are never polling for POLLOUT here. This function is never called.
xs_assert (false);
}
void xs::io_thread_t::timer_event (handle_t handle_)
{
// No timers here. This function is never called.
xs_assert (false);
}
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