Dogcows Code - chaz/openbox/blob - src/timer.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; -*-
   2
   3 #ifdef    HAVE_CONFIG_H
   4 #  include "../config.h"
   5 #endif // HAVE_CONFIG_H
   6
   7 #include "otk/display.hh"
   8 #include "openbox.hh"
   9 #include "timer.hh"
  10 #include "util.hh"
  11
  12 namespace ob {
  13
  14 OBTimer::OBTimer(TimeoutHandler *h) {
  15   handler = h;
  16
  17   recur = timing = False;
  18 }
  19
  20
  21 OBTimer::~OBTimer(void) {
  22   if (timing) stop();
  23 }
  24
  25
  26 void OBTimer::setTimeout(long t) {
  27   _timeout.tv_sec = t / 1000;
  28   _timeout.tv_usec = t % 1000;
  29   _timeout.tv_usec *= 1000;
  30 }
  31
  32
  33 void OBTimer::setTimeout(const timeval &t) {
  34   _timeout.tv_sec = t.tv_sec;
  35   _timeout.tv_usec = t.tv_usec;
  36 }
  37
  38
  39 void OBTimer::start(void) {
  40   gettimeofday(&_start, 0);
  41
  42   if (! timing) {
  43     timing = True;
  44     Openbox::instance->timerManager()->addTimer(this);
  45   }
  46 }
  47
  48
  49 void OBTimer::stop(void) {
  50   timing = False;
  51
  52   Openbox::instance->timerManager()->removeTimer(this);
  53 }
  54
  55
  56 void OBTimer::halt(void) {
  57   timing = False;
  58 }
  59
  60
  61 void OBTimer::fireTimeout(void) {
  62   if (handler)
  63     handler->timeout();
  64 }
  65
  66
  67 timeval OBTimer::timeRemaining(const timeval &tm) const {
  68   timeval ret = endpoint();
  69
  70   ret.tv_sec  -= tm.tv_sec;
  71   ret.tv_usec -= tm.tv_usec;
  72
  73   return normalizeTimeval(ret);
  74 }
  75
  76
  77 timeval OBTimer::endpoint(void) const {
  78   timeval ret;
  79
  80   ret.tv_sec = _start.tv_sec + _timeout.tv_sec;
  81   ret.tv_usec = _start.tv_usec + _timeout.tv_usec;
  82
  83   return normalizeTimeval(ret);
  84 }
  85
  86
  87 bool OBTimer::shouldFire(const timeval &tm) const {
  88   timeval end = endpoint();
  89
  90   return ! ((tm.tv_sec < end.tv_sec) ||
  91             (tm.tv_sec == end.tv_sec && tm.tv_usec < end.tv_usec));
  92 }
  93
  94
  95 void OBTimerQueueManager::fire()
  96 {
  97   fd_set rfds;
  98   timeval now, tm, *timeout = (timeval *) 0;
  99
 100   const int xfd = ConnectionNumber(otk::OBDisplay::display);
 101
 102   FD_ZERO(&rfds);
 103   FD_SET(xfd, &rfds); // break on any x events
 104
 105   if (! timerList.empty()) {
 106     const OBTimer* const timer = timerList.top();
 107
 108     gettimeofday(&now, 0);
 109     tm = timer->timeRemaining(now);
 110
 111     timeout = &tm;
 112   }
 113
 114   select(xfd + 1, &rfds, 0, 0, timeout);
 115
 116   // check for timer timeout
 117   gettimeofday(&now, 0);
 118
 119   // there is a small chance for deadlock here:
 120   // *IF* the timer list keeps getting refreshed *AND* the time between
 121   // timer->start() and timer->shouldFire() is within the timer's period
 122   // then the timer will keep firing.  This should be VERY near impossible.
 123   while (! timerList.empty()) {
 124     OBTimer *timer = timerList.top();
 125     if (! timer->shouldFire(now))
 126       break;
 127
 128     timerList.pop();
 129
 130     timer->fireTimeout();
 131     timer->halt();
 132     if (timer->isRecurring())
 133       timer->start();
 134   }
 135 }
 136
 137
 138 void OBTimerQueueManager::addTimer(OBTimer *timer)
 139 {
 140   assert(timer);
 141   timerList.push(timer);
 142 }
 143
 144 void OBTimerQueueManager::removeTimer(OBTimer* timer)
 145 {
 146   assert(timer);
 147   timerList.release(timer);
 148 }
 149
 150 }