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 #ifdef    HAVE_SYS_SELECT_H
  11 #  include <sys/select.h>
  12 #else
  13 #  ifdef    HAVE_UNISTD_H
  14 #    include <sys/types.h>
  15 #    include <unistd.h>
  16 #  endif // HAVE_UNISTD_H
  17 #endif // HAVE_SYS_SELECT_H
  18
  19 namespace otk {
  20
  21 timeval Timer::_nearest_timeout, Timer::_now;
  22 Timer::TimerQ Timer::_q;
  23
  24 void Timer::timevalAdd(timeval &a, long msec)
  25 {
  26   a.tv_sec += msec / 1000;
  27   a.tv_usec += (msec % 1000) * 1000;
  28   a.tv_sec += a.tv_usec / 1000000;
  29   a.tv_usec %= 1000000;
  30 }
  31
  32 bool Timer::nearestTimeout(struct timeval &tm)
  33 {
  34   if (_q.empty())
  35     return false;
  36   tm.tv_sec = _nearest_timeout.tv_sec - _now.tv_sec;
  37   tm.tv_usec = _nearest_timeout.tv_usec - _now.tv_usec;
  38
  39   while (tm.tv_usec < 0) {
  40     tm.tv_usec += 1000000;
  41     tm.tv_sec--;
  42   }
  43   tm.tv_sec += tm.tv_usec / 1000000;
  44   tm.tv_usec %= 1000000;
  45   if (tm.tv_sec < 0)
  46     tm.tv_sec = 0;
  47
  48   return true;
  49 }
  50
  51 void Timer::dispatchTimers(bool wait)
  52 {
  53   fd_set selset;
  54   int fd;
  55   timeval next;
  56   Timer *curr;
  57
  58   gettimeofday(&_now, NULL);
  59   _nearest_timeout = _now;
  60   _nearest_timeout.tv_sec += 10000;
  61
  62   while (!_q.empty()) {
  63     curr = _q.top();
  64     /* since we overload the destructor to keep from removing from the middle of
  65        the priority queue, set _del_me, we have to do our real delete in 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 if
  80        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
  89   if (wait) {
  90     // wait for the nearest trigger, or for X to do something interesting
  91     fd = ConnectionNumber(**display);
  92     FD_ZERO(&selset);
  93     FD_SET(fd, &selset);
  94     if (nearestTimeout(next))
  95       select(fd + 1, &selset, NULL, NULL, &next);
  96     else
  97       select(fd + 1, &selset, NULL, NULL, NULL);
  98   }
  99 }
 100
 101 Timer::Timer(long delay, Timer::TimeoutHandler action, void *data)
 102   : _delay(delay),
 103     _action(action),
 104     _data(data),
 105     _del_me(false),
 106     _last(_now),
 107     _timeout(_now)
 108 {
 109   timevalAdd(_timeout, delay);
 110   _q.push(this);
 111 }
 112
 113 void Timer::operator delete(void *self)
 114 {
 115   Timer *t;
 116   t = (Timer *)self;
 117   t->_del_me = true;
 118 }
 119
 120 void Timer::realDelete(Timer *me)
 121 {
 122   ::delete me;
 123 }
 124
 125 void Timer::initialize(void)
 126 {
 127   gettimeofday(&_now, NULL);
 128   _nearest_timeout.tv_sec = 100000;
 129   _nearest_timeout.tv_usec = 0;
 130 }
 131
 132 void Timer::destroy(void)
 133 {
 134   while(!_q.empty()) {
 135     realDelete(_q.top());
 136     _q.pop();
 137   }
 138 }
 139
 140 }