// Timer.cc for FbTk - Fluxbox Toolkit // Copyright (c) 2003 - 2006 Henrik Kinnunen (fluxgen at fluxbox dot org) // // Timer.cc for Blackbox - An X11 Window Manager // Copyright (c) 1997 - 2000 Brad Hughes (bhughes at tcac.net) // // Permission is hereby granted, free of charge, to any person obtaining a // copy of this software and associated documentation files (the "Software"), // to deal in the Software without restriction, including without limitation // the rights to use, copy, modify, merge, publish, distribute, sublicense, // and/or sell copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER // DEALINGS IN THE SOFTWARE. #include "Timer.hh" #include "Command.hh" //use GNU extensions #ifndef _GNU_SOURCE #define _GNU_SOURCE #endif // _GNU_SOURCE #ifdef HAVE_CONFIG_H #include "config.h" #endif // HAVE_CONFIG_H #include <sys/time.h> #include <sys/types.h> #include <unistd.h> #ifdef HAVE_CASSERT #include <cassert> #else #include <assert.h> #endif namespace FbTk { Timer::TimerList Timer::m_timerlist; Timer::Timer():m_timing(false), m_once(false), m_interval(0) { } Timer::Timer(RefCount<Command> &handler): m_handler(handler), m_timing(false), m_once(false), m_interval(0) { } Timer::~Timer() { if (isTiming()) stop(); } void Timer::setTimeout(time_t t) { m_timeout.tv_sec = t / 1000; m_timeout.tv_usec = t; m_timeout.tv_usec -= (m_timeout.tv_sec * 1000); m_timeout.tv_usec *= 1000; } void Timer::setTimeout(const timeval &t) { m_timeout.tv_sec = t.tv_sec; m_timeout.tv_usec = t.tv_usec; } void Timer::setCommand(RefCount<Command> &cmd) { m_handler = cmd; } void Timer::start() { gettimeofday(&m_start, 0); // only add Timers that actually DO something if ((! m_timing || m_interval != 0) && *m_handler) { m_timing = true; addTimer(this); //add us to the list } } void Timer::stop() { m_timing = false; removeTimer(this); //remove us from the list } void Timer::makeEndTime(timeval &tm) const { tm.tv_sec = m_start.tv_sec + m_timeout.tv_sec; tm.tv_usec = m_start.tv_usec + m_timeout.tv_usec; if (tm.tv_usec >= 1000000) { tm.tv_usec -= 1000000; tm.tv_sec++; } } void Timer::fireTimeout() { if (*m_handler) m_handler->execute(); } void Timer::updateTimers(int fd) { fd_set rfds; timeval now, tm, *timeout = 0; FD_ZERO(&rfds); FD_SET(fd, &rfds); bool overdue = false; if (!m_timerlist.empty()) { gettimeofday(&now, 0); Timer *timer = m_timerlist.front(); timer->makeEndTime(tm); tm.tv_sec -= now.tv_sec; tm.tv_usec -= now.tv_usec; while (tm.tv_usec < 0) { if (tm.tv_sec > 0) { tm.tv_sec--; tm.tv_usec += 1000000; } else { overdue = true; tm.tv_usec = 0; break; } } if (tm.tv_sec < 0) { // usec zero-ed above if negative tm.tv_sec = 0; tm.tv_usec = 0; overdue = true; } timeout = &tm; } if (!overdue && select(fd + 1, &rfds, 0, 0, timeout) != 0) // didn't time out! x events pending return; TimerList::iterator it; // check for timer timeout gettimeofday(&now, 0); // someone set the date of the machine BACK // so we have to adjust the start_time static time_t last_time = 0; if (now.tv_sec < last_time) { time_t delta = last_time - now.tv_sec; for (it = m_timerlist.begin(); it != m_timerlist.end(); it++) { (*it)->m_start.tv_sec -= delta; } } last_time = now.tv_sec; //must check end ...the timer might remove //it self from the list (should be fixed in the future) for(it = m_timerlist.begin(); it != m_timerlist.end(); ) { //This is to make sure we don't get an invalid iterator //when we do fireTimeout Timer &t = *(*it); t.makeEndTime(tm); if (((now.tv_sec < tm.tv_sec) || (now.tv_sec == tm.tv_sec && now.tv_usec < tm.tv_usec))) break; t.fireTimeout(); // restart the current timer so that the start time is updated if (! t.doOnce()) { // must erase so that it's put into the right place in the list it = m_timerlist.erase(it); t.m_timing = false; t.start(); } else { // Since the default stop behaviour results in the timer // being removed, we must remove it here, so that the iterator // lives well. Another option would be to add it to another // list, and then just go through that list and stop them all. it = m_timerlist.erase(it); t.stop(); } } } void Timer::addTimer(Timer *timer) { assert(timer); int interval = timer->getInterval(); // interval timers have their timeout change every time they are started! timeval tm; if (interval != 0) { tm.tv_sec = timer->getStartTime().tv_sec; tm.tv_usec = timer->getStartTime().tv_usec; // now convert to interval tm.tv_sec = interval - (tm.tv_sec % interval) - 1; tm.tv_usec = 1000000 - tm.tv_usec; if (tm.tv_usec == 1000000) { tm.tv_usec = 0; tm.tv_sec += 1; } timer->setTimeout(tm); } // set timeval to the time-of-trigger timer->makeEndTime(tm); // timer list is sorted by trigger time (i.e. start plus timeout) TimerList::iterator it = m_timerlist.begin(); TimerList::iterator it_end = m_timerlist.end(); for (; it != it_end; ++it) { timeval trig; (*it)->makeEndTime(trig); if ((trig.tv_sec > tm.tv_sec) || (trig.tv_sec == tm.tv_sec && trig.tv_usec >= tm.tv_usec)) { break; } } m_timerlist.insert(it, timer); } void Timer::removeTimer(Timer *timer) { assert(timer); m_timerlist.remove(timer); } }; // end namespace FbTk