Dogcows Code - chaz/openbox/blob - otk/timer.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 "timer.hh"
   8 #include "display.hh"
   9
  10 namespace otk {
  11
  12 timeval Timer::_nearest_timeout, Timer::_now;
  13 Timer::TimerQ Timer::_q;
  14
  15 void Timer::timevalAdd(timeval &a, long msec)
  16 {
  17   a.tv_sec += msec / 1000;
  18   a.tv_usec += (msec % 1000) * 1000;
  19   a.tv_sec += a.tv_usec / 1000000;
  20   a.tv_usec %= 1000000;
  21 }
  22
  23 bool Timer::nearestTimeout(struct timeval &tm)
  24 {
  25   if (_q.empty())
  26     return false;
  27   tm.tv_sec = _nearest_timeout.tv_sec - _now.tv_sec;
  28   tm.tv_usec = _nearest_timeout.tv_usec - _now.tv_usec;
  29
  30   while (tm.tv_usec < 0) {
  31     tm.tv_usec += 1000000;
  32     tm.tv_sec--;
  33   }
  34   tm.tv_sec += tm.tv_usec / 1000000;
  35   tm.tv_usec %= 1000000;
  36   if (tm.tv_sec < 0)
  37     tm.tv_sec = 0;
  38
  39   return true;
  40 }
  41
  42 void Timer::dispatchTimers(bool wait)
  43 {
  44   fd_set selset;
  45   int fd;
  46   timeval next;
  47   Timer *curr;
  48
  49   gettimeofday(&_now, NULL);
  50   _nearest_timeout = _now;
  51   _nearest_timeout.tv_sec += 10000;
  52
  53   while (!_q.empty()) {
  54     curr = _q.top();
  55     /* since we overload the destructor to keep from removing from the middle of
  56        the priority queue, set _del_me, we have to do our real delete in here.
  57     */
  58     if (curr->_del_me) {
  59       _q.pop();
  60       realDelete(curr);
  61       continue;
  62     }
  63
  64     // the queue is sorted, so if this timer shouldn't fire, none are ready
  65     _nearest_timeout = curr->_timeout;
  66     if (!timercmp(&_now, &_nearest_timeout, >))
  67       break;
  68
  69     /* we set the last fired time to delay msec after the previous firing, then
  70        re-insert.  timers maintain their order and may trigger more than once if
  71        they've waited more than one delay's worth of time.
  72     */
  73     _q.pop();
  74     timevalAdd(curr->_last, curr->_delay);
  75     curr->_action(curr->_data);
  76     timevalAdd(curr->_timeout, curr->_delay);
  77     _q.push(curr);
  78   }
  79
  80   if (wait) {
  81     // wait for the nearest trigger, or for X to do something interesting
  82     fd = ConnectionNumber(**display);
  83     FD_ZERO(&selset);
  84     FD_SET(fd, &selset);
  85     if (nearestTimeout(next))
  86       select(fd + 1, &selset, NULL, NULL, &next);
  87     else
  88       select(fd + 1, &selset, NULL, NULL, NULL);
  89   }
  90 }
  91
  92 Timer::Timer(long delay, Timer::TimeoutHandler action, void *data)
  93   : _delay(delay),
  94     _action(action),
  95     _data(data),
  96     _del_me(false),
  97     _last(_now),
  98     _timeout(_now)
  99 {
 100   timevalAdd(_timeout, delay);
 101   _q.push(this);
 102 }
 103
 104 void Timer::operator delete(void *self)
 105 {
 106   Timer *t;
 107   t = (Timer *)self;
 108   t->_del_me = true;
 109 }
 110
 111 void Timer::realDelete(Timer *me)
 112 {
 113   ::delete me;
 114 }
 115
 116 void Timer::initialize(void)
 117 {
 118   gettimeofday(&_now, NULL);
 119   _nearest_timeout.tv_sec = 100000;
 120   _nearest_timeout.tv_usec = 0;
 121 }
 122
 123 void Timer::destroy(void)
 124 {
 125   while(!_q.empty()) {
 126     realDelete(_q.top());
 127     _q.pop();
 128   }
 129 }
 130
 131 }