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()
  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 (! timerList.empty()) {
  23     const OBTimer* const timer = timerList.top();
  24
  25     gettimeofday(&now, 0);
  26     tm = timer->remainingTime(now);
  27
  28     timeout = &tm;
  29   }
  30
  31   select(xfd + 1, &rfds, 0, 0, timeout);
  32
  33   // check for timer timeout
  34   gettimeofday(&now, 0);
  35
  36   // there is a small chance for deadlock here:
  37   // *IF* the timer list keeps getting refreshed *AND* the time between
  38   // timer->start() and timer->shouldFire() is within the timer's period
  39   // then the timer will keep firing.  This should be VERY near impossible.
  40   while (! timerList.empty()) {
  41     OBTimer *timer = timerList.top();
  42     if (! timer->shouldFire(now))
  43       break;
  44
  45     timerList.pop();
  46
  47     timer->fire();
  48     if (timer->recurring())
  49       timer->start();
  50   }
  51 }
  52
  53
  54 void OBTimerQueueManager::addTimer(OBTimer *timer)
  55 {
  56   assert(timer);
  57   timerList.push(timer);
  58 }
  59
  60 void OBTimerQueueManager::removeTimer(OBTimer* timer)
  61 {
  62   assert(timer);
  63   timerList.release(timer);
  64 }
  65
  66 }