Dogcows Code - chaz/openbox/blob - otk/timerqueuemanager.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2
   3 #ifdef    HAVE_CONFIG_H
   4 #  include "../config.h"
   5 #endif // HAVE_CONFIG_H
   6
   7 #include "timerqueuemanager.hh"
   8 #include "display.hh"
   9
  10 namespace otk {
  11
  12 void OBTimerQueueManager::fire(bool wait)
  13 {
  14   fd_set rfds;
  15   timeval now, tm, *timeout = (timeval *) 0;
  16
  17   const int xfd = ConnectionNumber(otk::OBDisplay::display);
  18
  19   FD_ZERO(&rfds);
  20   FD_SET(xfd, &rfds); // break on any x events
  21
  22   if (wait) {
  23     if (! timerList.empty()) {
  24       const OBTimer* const timer = timerList.top();
  25
  26       gettimeofday(&now, 0);
  27       tm = timer->remainingTime(now);
  28
  29       timeout = &tm;
  30     }
  31
  32     select(xfd + 1, &rfds, 0, 0, timeout);
  33   }
  34
  35   // check for timer timeout
  36   gettimeofday(&now, 0);
  37
  38   // there is a small chance for deadlock here:
  39   // *IF* the timer list keeps getting refreshed *AND* the time between
  40   // timer->start() and timer->shouldFire() is within the timer's period
  41   // then the timer will keep firing.  This should be VERY near impossible.
  42   while (! timerList.empty()) {
  43     OBTimer *timer = timerList.top();
  44     if (! timer->shouldFire(now))
  45       break;
  46
  47     timerList.pop();
  48
  49     timer->fire();
  50     if (timer->recurring())
  51       timer->start();
  52   }
  53 }
  54
  55
  56 void OBTimerQueueManager::addTimer(OBTimer *timer)
  57 {
  58   assert(timer);
  59   timerList.push(timer);
  60 }
  61
  62 void OBTimerQueueManager::removeTimer(OBTimer* timer)
  63 {
  64   assert(timer);
  65   timerList.release(timer);
  66 }
  67
  68 }