1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
#include <minix/timers.h>
/*
* Activate a timer to run function 'watchdog' at absolute time 'exp_time', as
* part of timers queue 'tmrs'. If the timer is already in use, it is first
* removed from the timers queue. Then, it is put in the list of active timers
* with the first to expire in front. The caller responsible for scheduling a
* new alarm for the timer if needed. To that end, the function returns three
* values: its return value (TRUE or FALSE) indicates whether there was an old
* head timer; if TRUE, 'old_head' (if non-NULL) is filled with the absolute
* expiry time of the old head timer. If 'new_head' is non-NULL, it is filled
* with the absolute expiry time of the new head timer.
*/
int
tmrs_settimer(minix_timer_t ** tmrs, minix_timer_t * tp, clock_t exp_time,
tmr_func_t watchdog, int arg, clock_t * old_head, clock_t * new_head)
{
minix_timer_t **atp;
int r;
if (*tmrs != NULL) {
if (old_head != NULL)
*old_head = (*tmrs)->tmr_exp_time;
r = TRUE;
} else
r = FALSE;
/* Set the timer's variables. */
if (tmr_is_set(tp))
(void)tmrs_clrtimer(tmrs, tp, NULL, NULL);
tp->tmr_exp_time = exp_time;
tp->tmr_func = watchdog; /* set the timer object */
tp->tmr_arg = arg;
/*
* Add the timer to the active timers. The next timer due is in front.
*/
for (atp = tmrs; *atp != NULL; atp = &(*atp)->tmr_next) {
if (tmr_is_first(exp_time, (*atp)->tmr_exp_time))
break;
}
tp->tmr_next = *atp;
*atp = tp;
if (new_head != NULL)
*new_head = (*tmrs)->tmr_exp_time;
return r;
}
|
