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