minix/servers/vfs/timers.c

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/* FS timers library
*/
#include "fs.h"
#include <timers.h>
#include <minix/syslib.h>
#include <minix/com.h>
PRIVATE timer_t *fs_timers = NULL;
PUBLIC void fs_set_timer(timer_t *tp, int ticks, tmr_func_t watchdog, int arg)
{
int r;
clock_t now, old_head = 0, new_head;
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if ((r = getuptime(&now)) != OK)
panic(__FILE__, "FS couldn't get uptime from system task.", NO_NUM);
tmr_arg(tp)->ta_int = arg;
old_head = tmrs_settimer(&fs_timers, tp, now+ticks, watchdog, &new_head);
/* reschedule our synchronous alarm if necessary */
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if (!old_head || old_head > new_head) {
if (sys_setalarm(new_head, 1) != OK)
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panic(__FILE__, "FS set timer "
"couldn't set synchronous alarm.", NO_NUM);
}
return;
}
PUBLIC void fs_expire_timers(clock_t now)
{
clock_t new_head;
tmrs_exptimers(&fs_timers, now, &new_head);
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if (new_head > 0) {
if (sys_setalarm(new_head, 1) != OK)
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panic(__FILE__, "FS expire timer couldn't set "
"synchronous alarm.", NO_NUM);
}
}
PUBLIC void fs_init_timer(timer_t *tp)
{
tmr_inittimer(tp);
}
PUBLIC void fs_cancel_timer(timer_t *tp)
{
clock_t new_head, old_head;
old_head = tmrs_clrtimer(&fs_timers, tp, &new_head);
/* 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 (new_head
* will be 0 then).
*/
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if (old_head < new_head || !new_head) {
if (sys_setalarm(new_head, 1) != OK)
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panic(__FILE__,
"FS expire timer couldn't set synchronous alarm.",
NO_NUM);
}
}