C++ (Cpp) Monitor::callback Examples

Example #1

File: mainloop.cpp Project: pchri03/libeventcore

int MainLoop::run()
{
	while (m_epoll != -1 && (m_monitors.size() != 0 || m_timers.size() != 0))
	{
		// Get desired timeout
		int timeout = -1;
		TimerMap::const_iterator timer = m_timers.begin();
		if (timer != m_timers.end())
		{
			timeout = timer->second->timeout();
		}

		// Wait for events
		epoll_event events[32];
		int count = ::epoll_wait(m_epoll, events, sizeof(events) / sizeof(events[0]), timeout);
		if (count == -1 && errno == EINTR)
			continue;
		if (count == -1)
			break;

#ifdef MAINLOOP_THREADS
		std::unique_lock<std::mutex> lock(m_mutex);
#endif // MAINLOOP_THREADS

		// Handle events
		for (int i = 0; i != count; ++i)
		{
			auto it = m_monitors.find(events[i].data.fd);
			if (it == m_monitors.end())
				continue;

			Monitor *monitor = it->second;
			if (monitor->callback)
			{
				Direction dir;
				switch (events[i].events & (EPOLLIN|EPOLLOUT))
				{
					case EPOLLIN:
						dir = In;
						break;

					case EPOLLOUT:
						dir = Out;
						break;

					case EPOLLIN | EPOLLOUT:
						dir = InOut;
						break;

					default:
						dir = Error;
				}
#ifdef MAINLOOP_THREADS
				lock.unlock();
#endif // MAINLOOP_THREADS
				monitor->callback(dir);
#ifdef MAINLOOP_THREADS
				lock.lock();
#endif // MAINLOOP_THREADS
			}
		}

		// Handle expired timers
		unsigned long long int t = Timer::currentTime();
		for (TimerMap::iterator it = m_timers.begin(); it != m_timers.end() && it->first <= t; it = m_timers.begin())
		{
			Timer *timer = it->second;
			m_timers.erase(it);

#ifdef MAINLOOP_THREADS
			lock.unlock();
#endif // MAINLOOP_THREADS
			timer->callback()();
#ifdef MAINLOOP_THREADS
			lock.lock();
#endif // MAIN_LOOP_THREADS
		}
	}

	return m_exitCode;
}