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/*
Copyright (C) 2009 Red Hat, Inc.
This library 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 2.1 of the License, or (at your option) any later version.
This library 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 library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "common.h"
#include "process_loop.h"
#include "debug.h"
#include "platform.h"
#include "utils.h"
SyncEvent::SyncEvent()
: _err (false)
, _ready (false)
{
}
SyncEvent::~SyncEvent()
{
}
void SyncEvent::response(AbstractProcessLoop& events_loop)
{
try {
do_response(events_loop);
} catch (Exception& e) {
LOG_WARN("unhandled exception: %s", e.what());
_err = true;
} catch (...) {
_err = true;
}
Lock lock(_mutex);
_ready = true;
_condition.notify_one();
}
void SyncEvent::wait()
{
#ifdef RED_DEBUG
ASSERT(_process_loop && !_process_loop->is_same_thread(pthread_self()));
#endif
Lock lock(_mutex);
while (!_ready) {
_condition.wait(lock);
}
}
class ProcessLoop::QuitEvent: public Event {
public:
QuitEvent(int error_code) : _error_code(error_code) {}
virtual void response(AbstractProcessLoop& events_loop);
private:
int _error_code;
};
void ProcessLoop::QuitEvent::response(AbstractProcessLoop& events_loop)
{
events_loop.do_quit(_error_code);
}
/* EventsQueue */
EventsQueue::EventsQueue(AbstractProcessLoop& owner)
: _events_gen (0)
, _owner (owner)
{
}
EventsQueue::~EventsQueue()
{
clear_queue();
}
void EventsQueue::clear_queue()
{
Lock lock(_events_lock);
while (!_events.empty()) {
Event* event = _events.front();
_events.pop_front();
event->unref();
}
}
int EventsQueue::push_event(Event* event)
{
Lock lock(_events_lock);
_events.push_back(event);
event->set_generation(_events_gen);
event->ref();
#ifdef RED_DEBUG
event->set_process_loop(&_owner);
#endif
return _events.size();
}
void EventsQueue::process_events()
{
_events_gen++;
for (;;) {
Event* event;
Lock lock(_events_lock);
if (_events.empty()) {
return;
}
event = _events.front();
if (event->get_generation() == _events_gen) {
return;
}
_events.pop_front();
lock.unlock();
event->response(_owner);
event->unref();
}
}
bool EventsQueue::is_empty()
{
Lock lock(_events_lock);
return _events.empty();
}
/* Timers Queue */
Timer::Timer()
: _is_armed (false)
{
}
Timer::~Timer()
{
}
void Timer::arm(uint32_t msec)
{
_interval = msec;
_expiration = get_now();
calc_next_expiration_time();
_is_armed = true;
}
void Timer::disarm()
{
_is_armed = false;
}
#define TIMER_COMPENSATION
void Timer::calc_next_expiration_time(uint64_t now)
{
#ifndef TIMER_COMPENSATION
_expiratoin = now;
#endif
calc_next_expiration_time();
#ifdef TIMER_COMPENSATION
if (_expiration <= now) {
_expiration = now;
calc_next_expiration_time();
}
#endif
}
uint64_t Timer::get_now()
{
return (Platform::get_monolithic_time() / 1000 / 1000);
}
TimersQueue::TimersQueue(AbstractProcessLoop& owner)
: _owner (owner)
{
}
TimersQueue::~TimersQueue()
{
clear_queue();
}
void TimersQueue::clear_queue()
{
RecurciveLock lock(_timers_lock);
TimersSet::iterator iter;
for (iter = _armed_timers.begin(); iter != _armed_timers.end(); iter++) {
(*iter)->disarm();
}
_armed_timers.clear();
}
void TimersQueue::activate_interval_timer(Timer* timer, unsigned int millisec)
{
RecurciveLock lock(_timers_lock);
timer->ref();
deactivate_interval_timer(timer);
timer->arm(millisec);
_armed_timers.insert(timer);
}
void TimersQueue::deactivate_interval_timer(Timer* timer)
{
RecurciveLock lock(_timers_lock);
if (timer->is_armed()) {
#ifdef RED_DEBUG
int ret =
#endif
_armed_timers.erase(timer);
ASSERT(ret);
timer->disarm();
timer->unref();
}
}
unsigned int TimersQueue::get_soonest_timeout()
{
RecurciveLock lock(_timers_lock);
TimersSet::iterator iter;
iter = _armed_timers.begin();
if (iter == _armed_timers.end()) {
return INFINITE;
}
uint64_t now = Timer::get_now();
uint64_t next_time = (*iter)->get_expiration();
if (next_time <= now) {
return 0;
}
return (int)(next_time - now);
}
void TimersQueue::timers_action()
{
RecurciveLock lock(_timers_lock);
uint64_t now = Timer::get_now();
TimersSet::iterator iter;
while (((iter = _armed_timers.begin()) != _armed_timers.end()) &&
((*iter)->get_expiration() <= now)) {
Timer* timer = *iter;
_armed_timers.erase(iter);
timer->calc_next_expiration_time(now);
_armed_timers.insert(timer);
timer->response(_owner);
}
}
ProcessLoop::ProcessLoop(void* owner)
: _events_queue (*this)
, _timers_queue (*this)
, _owner (owner)
, _quitting (false)
, _exit_code (0)
, _started (false)
{
_event_sources.add_trigger(_wakeup_trigger);
}
ProcessLoop::~ProcessLoop()
{
_event_sources.remove_trigger(_wakeup_trigger);
}
int ProcessLoop::run()
{
_thread = pthread_self();
_started = true;
on_start_running();
for (;;) {
if (_event_sources.wait_events(_timers_queue.get_soonest_timeout())) {
_quitting = true;
break;
}
_timers_queue.timers_action();
process_events_queue();
if (_quitting) {
break;
}
}
return _exit_code;
}
void ProcessLoop::do_quit(int error_code)
{
ASSERT(!_started || pthread_equal(pthread_self(), _thread));
if (_quitting) {
return;
}
_quitting = true;
_exit_code = error_code;
}
void ProcessLoop::quit(int error_code)
{
AutoRef<QuitEvent> quit_event(new QuitEvent(error_code));
push_event(*quit_event);
}
void ProcessLoop::process_events_queue()
{
ASSERT(!_started || pthread_equal(pthread_self(), _thread));
_events_queue.process_events();
if (!_events_queue.is_empty()) {
wakeup();
}
}
void ProcessLoop::wakeup()
{
_wakeup_trigger.trigger();
}
void ProcessLoop::add_trigger(EventSources::Trigger& trigger)
{
ASSERT(!_started || pthread_equal(pthread_self(), _thread));
_event_sources.add_trigger(trigger);
}
void ProcessLoop::remove_trigger(EventSources::Trigger& trigger)
{
ASSERT(!_started || pthread_equal(pthread_self(), _thread));
_event_sources.remove_trigger(trigger);
}
void ProcessLoop::add_socket(EventSources::Socket& socket)
{
ASSERT(!_started || pthread_equal(pthread_self(), _thread));
_event_sources.add_socket(socket);
}
void ProcessLoop::remove_socket(EventSources::Socket& socket)
{
ASSERT(!_started || pthread_equal(pthread_self(), _thread));
_event_sources.remove_socket(socket);
}
void ProcessLoop::add_file(EventSources::File& file)
{
ASSERT(!_started || pthread_equal(pthread_self(), _thread));
_event_sources.add_file(file);
}
void ProcessLoop::remove_file(EventSources::File& file)
{
ASSERT(!_started || pthread_equal(pthread_self(), _thread));
_event_sources.remove_file(file);
}
void ProcessLoop::add_handle(EventSources::Handle& handle)
{
ASSERT(!_started || pthread_equal(pthread_self(), _thread));
_event_sources.add_handle(handle);
}
void ProcessLoop::remove_handle(EventSources::Handle& handle)
{
ASSERT(!_started || pthread_equal(pthread_self(), _thread));
_event_sources.remove_handle(handle);
}
void ProcessLoop::push_event(Event* event)
{
int queue_size = _events_queue.push_event(event);
if (queue_size == 1) { // queue was empty before the push
wakeup();
}
}
void ProcessLoop::activate_interval_timer(Timer* timer, unsigned int millisec)
{
_timers_queue.activate_interval_timer(timer, millisec);
if (_started && !pthread_equal(pthread_self(), _thread)) {
wakeup();
}
}
void ProcessLoop::deactivate_interval_timer(Timer* timer)
{
_timers_queue.deactivate_interval_timer(timer);
}
unsigned ProcessLoop::get_soonest_timeout()
{
return _timers_queue.get_soonest_timeout();
}
void ProcessLoop::timers_action()
{
_timers_queue.timers_action();
}
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