static void
TimerService(int data)
{
struct btTimer *tp, *exp, *next;
tp = TimerList;
if (tp) {
tp->rest = 0;
/* Multiple timers might expire at once. Create a list of expired timers */
exp = NULL;
do {
tp->state = TIMER_EXPIRED;
next = tp->next;
tp->enext = exp;
exp = tp;
tp = next;
} while (tp && tp->rest == 0);
TimerList = tp;
if (TimerList != NULL) /* Any timers remaining ? */
timer_InitService(1); /* Restart the Timer Service */
else
timer_TermService(); /* Stop the Timer Service */
/* Process all expired timers */
while (exp) {
ExpiredList = exp->enext;
exp->enext = NULL;
if (exp->func)
(*exp->func)(exp->arg);
exp = ExpiredList;
}
}
}
void
timer_Start(struct pppTimer *tp)
{
struct itimerval itimer;
struct pppTimer *t, *pt;
u_long ticks = 0;
sigset_t mask, omask;
sigemptyset(&mask);
sigaddset(&mask, SIGALRM);
sigprocmask(SIG_BLOCK, &mask, &omask);
if (tp->state != TIMER_STOPPED)
StopTimerNoBlock(tp);
if (tp->load == 0) {
log_Printf(LogTIMER, "%s timer[%p] has 0 load!\n", tp->name, tp);
sigprocmask(SIG_SETMASK, &omask, NULL);
return;
}
/*
* We just need to insert tp in the correct relative place. We don't
* need to adjust TimerList->rest (yet).
*/
if (TimerList && getitimer(ITIMER_REAL, &itimer) == 0)
ticks = RESTVAL(itimer) - TimerList->rest;
pt = NULL;
for (t = TimerList; t; t = t->next) {
if (ticks + t->rest >= tp->load)
break;
ticks += t->rest;
pt = t;
}
tp->state = TIMER_RUNNING;
tp->rest = tp->load - ticks;
if (t)
log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p] before %s "
"timer[%p], delta = %ld\n", tp->name, tp, t->name, t, tp->rest);
else
log_Printf(LogTIMER, "timer_Start: Inserting %s timer[%p]\n", tp->name, tp);
/* Insert given *tp just before *t */
tp->next = t;
if (pt) {
pt->next = tp;
} else {
TimerList = tp;
timer_InitService(t != NULL); /* [re]Start the Timer Service */
}
if (t)
t->rest -= tp->rest;
sigprocmask(SIG_SETMASK, &omask, NULL);
}
static void
StopTimerNoBlock(struct pppTimer *tp)
{
struct itimerval itimer;
struct pppTimer *t, *pt;
/*
* A RUNNING timer must be removed from TimerList (->next list).
* A STOPPED timer isn't in any list, but may have a bogus [e]next field.
* An EXPIRED timer is in the ->enext list.
*/
if (tp->state == TIMER_STOPPED)
return;
pt = NULL;
for (t = TimerList; t != tp && t != NULL; t = t->next)
pt = t;
if (t) {
if (pt)
pt->next = t->next;
else {
TimerList = t->next;
if (TimerList == NULL) /* Last one ? */
timer_TermService(); /* Terminate Timer Service */
}
if (t->next) {
if (!pt && getitimer(ITIMER_REAL, &itimer) == 0)
t->next->rest += RESTVAL(itimer); /* t (tp) was the first in the list */
else
t->next->rest += t->rest;
if (!pt && t->next->rest > 0) /* t->next is now the first in the list */
timer_InitService(1);
}
} else {
/* Search for any pending expired timers */
pt = NULL;
for (t = ExpiredList; t != tp && t != NULL; t = t->enext)
pt = t;
if (t) {
if (pt)
pt->enext = t->enext;
else
ExpiredList = t->enext;
} else if (tp->state == TIMER_RUNNING)
log_Printf(LogERROR, "Oops, %s timer not found!!\n", tp->name);
}
tp->next = tp->enext = NULL;
tp->state = TIMER_STOPPED;
}
static void
TimerService(void)
{
struct pppTimer *tp, *exp, *next;
if (log_IsKept(LogTIMER)) {
static time_t t; /* Only show timers globally every second */
time_t n = time(NULL);
if (n > t)
timer_Show(LogTIMER, NULL);
t = n;
}
tp = TimerList;
if (tp) {
tp->rest = 0;
/* Multiple timers might expire at once. Create a list of expired timers */
exp = NULL;
do {
tp->state = TIMER_EXPIRED;
next = tp->next;
tp->enext = exp;
exp = tp;
tp = next;
} while (tp && tp->rest == 0);
TimerList = tp;
if (TimerList != NULL) /* Any timers remaining ? */
timer_InitService(1); /* Restart the Timer Service */
else
timer_TermService(); /* Stop the Timer Service */
/* Process all expired timers */
while (exp) {
ExpiredList = exp->enext;
exp->enext = NULL;
if (exp->func)
(*exp->func)(exp->arg);
exp = ExpiredList;
}
}
}
