minix/servers/pm/timers.c

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/* PM watchdog timer management.
*/
#include "pm.h"
#define VERBOSE 0
#include <timers.h>
#include <minix/syslib.h>
#include <minix/com.h>
PRIVATE timer_t *pm_timers = NULL;
PUBLIC void pm_set_timer(timer_t *tp, int ticks, tmr_func_t watchdog, int arg)
{
int r;
clock_t now, prev_time = 0, next_time;
if((r = getuptime(&now)) != OK)
panic(__FILE__, "PM couldn't get uptime from system task.", NO_NUM);
/* Set timer argument. */
tmr_arg(tp)->ta_int = arg;
prev_time = tmrs_settimer(&pm_timers, tp, now+ticks, watchdog, &next_time);
/* reschedule our synchronous alarm if necessary */
if(! prev_time || prev_time > next_time) {
if(sys_syncalrm(SELF, next_time, 1) != OK)
panic(__FILE__, "PM set timer couldn't set synchronous alarm.", NO_NUM);
#if VERBOSE
else
printf("timers: after setting, set synalarm to %d -> %d\n", prev_time, next_time);
#endif
}
return;
}
PUBLIC void pm_expire_timers(clock_t now)
{
clock_t next_time;
tmrs_exptimers(&pm_timers, now, &next_time);
if(next_time > 0) {
if(sys_syncalrm(SELF, next_time, 1) != OK)
panic(__FILE__, "PM expire timer couldn't set synchronous alarm.", NO_NUM);
#if VERBOSE
else
printf("timers: after expiry, set synalarm to %d\n", next_time);
#endif
}
#if VERBOSE
else printf("after expiry, no new timer set\n");
#endif
}
PUBLIC void pm_cancel_timer(timer_t *tp)
{
clock_t next_time, prev_time;
prev_time = tmrs_clrtimer(&pm_timers, tp, &next_time);
/* if the earliest timer has been removed, we have to set
* the synalarm to the next timer, or cancel the synalarm
* altogether if th last time has been cancelled (next_time
* will be 0 then).
*/
if(prev_time < next_time || ! next_time) {
if(sys_syncalrm(SELF, next_time, 1) != OK)
panic(__FILE__, "PM expire timer couldn't set synchronous alarm.", NO_NUM);
#if VERBOSE
printf("timers: after cancelling, set synalarm to %d -> %d\n", prev_time, next_time);
#endif
}
#if VERBOSE
else printf("timers: after cancelling no new timer\n");
#endif
}