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Optimization in tickless mode handling. 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7796 35acf78f-673a-0410-8e92-d51de3d6d3f4
This commit is contained in:
Giovanni Di Sirio 2015-03-23 10:08:41 +00:00
parent ab86eaaf02
commit ac82171cfe
1 changed files with 33 additions and 22 deletions
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55
os/rt/include/chvt.h
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@ -473,22 +473,19 @@ static inline void chVTDoTickI(void) {
chDbgAssert(&ch.vtlist != (virtual_timers_list_t *)ch.vtlist.vt_next,
"timers list empty");
/* Timers processing loop.*/
/* First timer to be processed, its time is assumed to be between
"vt_lasttime" and "now".*/
vtp = ch.vtlist.vt_next;
chDbgAssert(chVTIsTimeWithinX(ch.vtlist.vt_lasttime + vtp->vt_delta,
ch.vtlist.vt_lasttime,
chVTGetSystemTimeX() + 1),
"out of time window");
/* Timers processing loop.*/
while (true) {
vtfunc_t fn;
/* Getting the current system time and calculating the time window since
the last time has expired.*/
now = chVTGetSystemTimeX();
delta = now - ch.vtlist.vt_lasttime;
/* The next element is outside the current time window, the loop
is stopped here.*/
if (vtp->vt_delta > delta) {
break;
}
/* The "last time" becomes this timer's expiration time.*/
ch.vtlist.vt_lasttime += vtp->vt_delta;
@ -502,23 +499,37 @@ static inline void chVTDoTickI(void) {
/* The callback is invoked outside the kernel critical zone.*/
fn(vtp->vt_par);
/* Next element in the list, if the list is empty then the timer is
stopped.*/
/* Re-entering the critical zone in order to continue the exploration
of the list.*/
chSysLockFromISR();
/* Next element in the list, if the list is empty then ending the loop.*/
vtp = ch.vtlist.vt_next;
if (&ch.vtlist == (virtual_timers_list_t *)vtp) {
port_timer_stop_alarm();
return;
}
}
/* Updating the alarm to the next deadline, deadline that must not be
closer in time than the minimum time delta.*/
delta = (vtp->vt_delta >= (systime_t)CH_CFG_ST_TIMEDELTA) ?
vtp->vt_delta : (systime_t)CH_CFG_ST_TIMEDELTA;
port_timer_set_alarm(now + delta);
chDbgAssert((chVTGetSystemTimeX() - ch.vtlist.vt_lasttime) < delta,
"exceeding delta");
/* Getting the current system time and calculating the time window since
the last time has expired.*/
now = chVTGetSystemTimeX();
delta = now - ch.vtlist.vt_lasttime;
/* The next element is outside the current time window, the loop
is stopped here.*/
if (vtp->vt_delta > delta) {
/* Updating the alarm to the next deadline, deadline that must not be
closer in time than the minimum time delta.*/
delta = (vtp->vt_delta >= (systime_t)CH_CFG_ST_TIMEDELTA) ?
vtp->vt_delta : (systime_t)CH_CFG_ST_TIMEDELTA;
port_timer_set_alarm(now + delta);
chDbgAssert((chVTGetSystemTimeX() - ch.vtlist.vt_lasttime) < delta,
"exceeding delta");
return;
}
}
#endif /* CH_CFG_ST_TIMEDELTA > 0 */
}