servers/vfs/timers.c

   1 /* FS timers library
   2  */
   3
   4 #include "fs.h"
   5 #include <timers.h>
   6 #include <minix/syslib.h>
   7 #include <minix/com.h>
   8
   9 PRIVATE timer_t *fs_timers = NULL;
  10
  11 PUBLIC void fs_set_timer(timer_t *tp, int ticks, tmr_func_t watchdog, int arg)
  12 {
  13         int r;
  14         clock_t now, old_head = 0, new_head;
  15
  16         if ((r = getuptime(&now)) != OK)
  17                 panic("FS couldn't get uptime from system task");
  18
  19         tmr_arg(tp)->ta_int = arg;
  20
  21         old_head = tmrs_settimer(&fs_timers, tp, now+ticks, watchdog, &new_head);
  22
  23         /* reschedule our synchronous alarm if necessary */
  24         if (!old_head || old_head > new_head) {
  25                 if (sys_setalarm(new_head, 1) != OK)
  26                         panic("FS set timer couldn't set synchronous alarm");
  27         }
  28
  29         return;
  30 }
  31
  32 PUBLIC void fs_expire_timers(clock_t now)
  33 {
  34         clock_t new_head;
  35         tmrs_exptimers(&fs_timers, now, &new_head);
  36         if (new_head > 0) {
  37                 if (sys_setalarm(new_head, 1) != OK)
  38                         panic("FS expire timer couldn't set synchronous alarm");
  39         }
  40 }
  41
  42 PUBLIC void fs_init_timer(timer_t *tp)
  43 {
  44         tmr_inittimer(tp);
  45 }
  46
  47 PUBLIC void fs_cancel_timer(timer_t *tp)
  48 {
  49         clock_t new_head, old_head;
  50         old_head = tmrs_clrtimer(&fs_timers, tp, &new_head);
  51
  52         /* if the earliest timer has been removed, we have to set
  53          * the synalarm to the next timer, or cancel the synalarm
  54          * altogether if th last time has been cancelled (new_head
  55          * will be 0 then).
  56          */
  57         if (old_head < new_head || !new_head) {
  58                 if (sys_setalarm(new_head, 1) != OK)
  59                         panic("FS expire timer couldn't set synchronous alarm");
  60         }
  61 }