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

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2
   3 #include "config.h"
   4
   5 #include "timer.hh"
   6 #include "display.hh"
   7
   8 extern "C" {
   9 #ifdef    HAVE_SYS_SELECT_H
  10 #  include <sys/select.h>
  11 #endif // HAVE_SYS_SELECT_H
  12
  13 #ifdef    HAVE_SYS_TIME_H
  14 #  include <sys/time.h>
  15 #endif
  16 }
  17
  18 namespace otk {
  19
  20 timeval Timer::_nearest_timeout, Timer::_now;
  21 Timer::TimerQ Timer::_q;
  22
  23 void Timer::timevalAdd(timeval &a, long msec)
  24 {
  25   a.tv_sec += msec / 1000;
  26   a.tv_usec += (msec % 1000) * 1000;
  27   a.tv_sec += a.tv_usec / 1000000;
  28   a.tv_usec %= 1000000;
  29 }
  30
  31 bool Timer::nearestTimeout(struct timeval &tm)
  32 {
  33   if (_q.empty())
  34     return false;
  35   tm.tv_sec = _nearest_timeout.tv_sec - _now.tv_sec;
  36   tm.tv_usec = _nearest_timeout.tv_usec - _now.tv_usec;
  37
  38   while (tm.tv_usec < 0) {
  39     tm.tv_usec += 1000000;
  40     tm.tv_sec--;
  41   }
  42   tm.tv_sec += tm.tv_usec / 1000000;
  43   tm.tv_usec %= 1000000;
  44   if (tm.tv_sec < 0)
  45     tm.tv_sec = 0;
  46
  47   return true;
  48 }
  49
  50 void Timer::dispatchTimers(bool wait)
  51 {
  52   fd_set selset;
  53   int fd;
  54   timeval next;
  55   Timer *curr;
  56
  57   gettimeofday(&_now, NULL);
  58   _nearest_timeout = _now;
  59   _nearest_timeout.tv_sec += 10000;
  60
  61   while (!_q.empty()) {
  62     curr = _q.top();
  63     /* since we overload the destructor to keep from removing from the middle
  64        of the priority queue, set _del_me, we have to do our real delete in
  65        here.
  66     */
  67     if (curr->_del_me) {
  68       _q.pop();
  69       realDelete(curr);
  70       continue;
  71     }
  72
  73     // the queue is sorted, so if this timer shouldn't fire, none are ready
  74     _nearest_timeout = curr->_timeout;
  75     if (!timercmp(&_now, &_nearest_timeout, >))
  76       break;
  77
  78     /* we set the last fired time to delay msec after the previous firing, then
  79        re-insert.  timers maintain their order and may trigger more than once
  80        if they've waited more than one delay's worth of time.
  81     */
  82     _q.pop();
  83     timevalAdd(curr->_last, curr->_delay);
  84     curr->_action(curr->_data);
  85     timevalAdd(curr->_timeout, curr->_delay);
  86     _q.push(curr);
  87
  88     /* if at least one timer fires, then don't wait on X events, as there may
  89        already be some in the queue from the timer callbacks.
  90     */
  91     wait = false;
  92   }
  93
  94   if (wait) {
  95     // wait for the nearest trigger, or for X to do something interesting
  96     fd = ConnectionNumber(**display);
  97     FD_ZERO(&selset);
  98     FD_SET(fd, &selset);
  99     if (nearestTimeout(next)) {
 100       select(fd + 1, &selset, NULL, NULL, &next);
 101     } else
 102       select(fd + 1, &selset, NULL, NULL, NULL);
 103   }
 104 }
 105
 106 Timer::Timer(long delay, Timer::TimeoutHandler action, void *data)
 107   : _delay(delay),
 108     _action(action),
 109     _data(data),
 110     _del_me(false),
 111     _last(_now),
 112     _timeout(_now)
 113 {
 114   timevalAdd(_timeout, delay);
 115   _q.push(this);
 116 }
 117
 118 void Timer::operator delete(void *self)
 119 {
 120   Timer *t;
 121   t = (Timer *)self;
 122   t->_del_me = true;
 123 }
 124
 125 void Timer::realDelete(Timer *me)
 126 {
 127   ::delete me;
 128 }
 129
 130 void Timer::initialize(void)
 131 {
 132   gettimeofday(&_now, NULL);
 133   _nearest_timeout.tv_sec = 100000;
 134   _nearest_timeout.tv_usec = 0;
 135 }
 136
 137 void Timer::destroy(void)
 138 {
 139   while(!_q.empty()) {
 140     realDelete(_q.top());
 141     _q.pop();
 142   }
 143 }
 144
 145 }