minix/servers/pm/timers.c
Jorrit Herder f1153541c7 Fixed bug in PM that caused update program not to be scheduled, so that
sync was not periodically run. Chain of timers was accidentially broken.

Kernel sends SIGKSTOP signal on shutdown. FS calls sync to clean up.
2005-07-20 15:27:42 +00:00

77 lines
2 KiB
C

/* 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
}