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(__FILE__, "FS couldn't get uptime from system task.", NO_NUM);
  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(__FILE__, "FS set timer "
  27                         "couldn't set synchronous alarm.", NO_NUM);
  28         }
  29
  30         return;
  31 }
  32
  33 PUBLIC void fs_expire_timers(clock_t now)
  34 {
  35         clock_t new_head;
  36         tmrs_exptimers(&fs_timers, now, &new_head);
  37         if (new_head > 0) {
  38                 if (sys_setalarm(new_head, 1) != OK)
  39                         panic(__FILE__, "FS expire timer couldn't set "
  40                                 "synchronous alarm.", NO_NUM);
  41         }
  42 }
  43
  44 PUBLIC void fs_init_timer(timer_t *tp)
  45 {
  46         tmr_inittimer(tp);
  47 }
  48
  49 PUBLIC void fs_cancel_timer(timer_t *tp)
  50 {
  51         clock_t new_head, old_head;
  52         old_head = tmrs_clrtimer(&fs_timers, tp, &new_head);
  53
  54         /* if the earliest timer has been removed, we have to set
  55          * the synalarm to the next timer, or cancel the synalarm
  56          * altogether if th last time has been cancelled (new_head
  57          * will be 0 then).
  58          */
  59         if (old_head < new_head || !new_head) {
  60                 if (sys_setalarm(new_head, 1) != OK)
  61                         panic(__FILE__,
  62                         "FS expire timer couldn't set synchronous alarm.",
  63                                  NO_NUM);
  64         }
  65 }