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
  67        of the priority queue, set _del_me, we have to do our real delete in
  68        here.
  69     */
  70     if (curr->_del_me) {
  71       _q.pop();
  72       realDelete(curr);
  73       continue;
  74     }
  75
  76     // the queue is sorted, so if this timer shouldn't fire, none are ready
  77     _nearest_timeout = curr->_timeout;
  78     if (!timercmp(&_now, &_nearest_timeout, >))
  79       break;
  80
  81     /* we set the last fired time to delay msec after the previous firing, then
  82        re-insert.  timers maintain their order and may trigger more than once
  83        if they've waited more than one delay's worth of time.
  84     */
  85     _q.pop();
  86     timevalAdd(curr->_last, curr->_delay);
  87     curr->_action(curr->_data);
  88     timevalAdd(curr->_timeout, curr->_delay);
  89     _q.push(curr);
  90
  91     /* if at least one timer fires, then don't wait on X events, as there may
  92        already be some in the queue from the timer callbacks.
  93     */
  94     wait = false;
  95   }
  96
  97   if (wait) {
  98     // wait for the nearest trigger, or for X to do something interesting
  99     fd = ConnectionNumber(**display);
 100     FD_ZERO(&selset);
 101     FD_SET(fd, &selset);
 102     if (nearestTimeout(next)) {
 103       select(fd + 1, &selset, NULL, NULL, &next);
 104     } else
 105       select(fd + 1, &selset, NULL, NULL, NULL);
 106   }
 107 }
 108
 109 Timer::Timer(long delay, Timer::TimeoutHandler action, void *data)
 110   : _delay(delay),
 111     _action(action),
 112     _data(data),
 113     _del_me(false),
 114     _last(_now),
 115     _timeout(_now)
 116 {
 117   timevalAdd(_timeout, delay);
 118   _q.push(this);
 119 }
 120
 121 void Timer::operator delete(void *self)
 122 {
 123   Timer *t;
 124   t = (Timer *)self;
 125   t->_del_me = true;
 126 }
 127
 128 void Timer::realDelete(Timer *me)
 129 {
 130   ::delete me;
 131 }
 132
 133 void Timer::initialize(void)
 134 {
 135   gettimeofday(&_now, NULL);
 136   _nearest_timeout.tv_sec = 100000;
 137   _nearest_timeout.tv_usec = 0;
 138 }
 139
 140 void Timer::destroy(void)
 141 {
 142   while(!_q.empty()) {
 143     realDelete(_q.top());
 144     _q.pop();
 145   }
 146 }
 147
 148 }