include/linux/posix-timers.h

   1 #ifndef _linux_POSIX_TIMERS_H
   2 #define _linux_POSIX_TIMERS_H
   3
   4 #include <linux/spinlock.h>
   5 #include <linux/list.h>
   6
   7 struct k_clock_abs {
   8         struct list_head list;
   9         spinlock_t lock;
  10 };
  11 struct k_clock {
  12         int res;                /* in nano seconds */
  13         struct k_clock_abs *abs_struct;
  14         int (*clock_set) (struct timespec * tp);
  15         int (*clock_get) (struct timespec * tp);
  16         int (*nsleep) (int flags,
  17                        struct timespec * new_setting,
  18                        struct itimerspec * old_setting);
  19         int (*timer_set) (struct k_itimer * timr, int flags,
  20                           struct itimerspec * new_setting,
  21                           struct itimerspec * old_setting);
  22         int (*timer_del) (struct k_itimer * timr);
  23         void (*timer_get) (struct k_itimer * timr,
  24                            struct itimerspec * cur_setting);
  25 };
  26 struct now_struct {
  27         unsigned long jiffies;
  28 };
  29
  30 #define posix_get_now(now) (now)->jiffies = jiffies;
  31 #define posix_time_before(timer, now) \
  32                       time_before((timer)->expires, (now)->jiffies)
  33
  34 #define posix_bump_timer(timr, now)                                     \
  35          do {                                                           \
  36               long delta, orun;                                         \
  37               delta = now.jiffies - (timr)->it_timer.expires;           \
  38               if (delta >= 0) {                                         \
  39                    orun = 1 + (delta / (timr)->it_incr);                \
  40                   (timr)->it_timer.expires += orun * (timr)->it_incr;   \
  41                   (timr)->it_overrun += orun;                           \
  42               }                                                         \
  43             }while (0)
  44 #endif