63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
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/* SCHED watchdog timer management, based on servers/pm/timers.c.
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*
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* The entry points into this file are:
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* sched_set_timer: reset and existing or set a new watchdog timer
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* sched_expire_timers: check for expired timers and run watchdog functions
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*
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*/
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#include "sched.h"
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#include <timers.h>
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#include <minix/syslib.h>
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#include <minix/com.h>
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PRIVATE timer_t *sched_timers = NULL;
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PRIVATE int sched_expiring = 0;
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/*===========================================================================*
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* pm_set_timer *
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*===========================================================================*/
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PUBLIC void sched_set_timer(timer_t *tp, int ticks, tmr_func_t watchdog, int arg)
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{
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int r;
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clock_t now, prev_time = 0, next_time;
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if ((r = getuptime(&now)) != OK)
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panic("SCHED couldn't get uptime");
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/* Set timer argument and add timer to the list. */
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tmr_arg(tp)->ta_int = arg;
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prev_time = tmrs_settimer(&sched_timers,tp,now+ticks,watchdog,&next_time);
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/* Reschedule our synchronous alarm if necessary. */
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if (sched_expiring == 0 && (! prev_time || prev_time > next_time)) {
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if (sys_setalarm(next_time, 1) != OK)
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panic("SCHED set timer couldn't set alarm");
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}
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return;
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}
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/*===========================================================================*
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* sched_expire_timers *
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*===========================================================================*/
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PUBLIC void sched_expire_timers(clock_t now)
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{
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clock_t next_time;
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/* Check for expired timers. Use a global variable to indicate that
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* watchdog functions are called, so that sys_setalarm() isn't called
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* more often than necessary when sched_set_timer is
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* called from these watchdog functions. */
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sched_expiring = 1;
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tmrs_exptimers(&sched_timers, now, &next_time);
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sched_expiring = 0;
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/* Reschedule an alarm if necessary. */
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if (next_time > 0) {
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if (sys_setalarm(next_time, 1) != OK)
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panic("SCHED expire timer couldn't set alarm");
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}
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}
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