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 #include <linux/sched.h>
   7
   8 union cpu_time_count {
   9         cputime_t cpu;
  10         unsigned long long sched;
  11 };
  12
  13 struct cpu_timer_list {
  14         struct list_head entry;
  15         union cpu_time_count expires, incr;
  16         struct task_struct *task;
  17         int firing;
  18 };
  19
  20 #define CPUCLOCK_PID(clock)             ((pid_t) ~((clock) >> 3))
  21 #define CPUCLOCK_PERTHREAD(clock) \
  22         (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
  23 #define CPUCLOCK_PID_MASK       7
  24 #define CPUCLOCK_PERTHREAD_MASK 4
  25 #define CPUCLOCK_WHICH(clock)   ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
  26 #define CPUCLOCK_CLOCK_MASK     3
  27 #define CPUCLOCK_PROF           0
  28 #define CPUCLOCK_VIRT           1
  29 #define CPUCLOCK_SCHED          2
  30 #define CPUCLOCK_MAX            3
  31
  32 #define MAKE_PROCESS_CPUCLOCK(pid, clock) \
  33         ((~(clockid_t) (pid) << 3) | (clockid_t) (clock))
  34 #define MAKE_THREAD_CPUCLOCK(tid, clock) \
  35         MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK)
  36
  37 /* POSIX.1b interval timer structure. */
  38 struct k_itimer {
  39         struct list_head list;          /* free/ allocate list */
  40         spinlock_t it_lock;
  41         clockid_t it_clock;             /* which timer type */
  42         timer_t it_id;                  /* timer id */
  43         int it_overrun;                 /* overrun on pending signal  */
  44         int it_overrun_last;            /* overrun on last delivered signal */
  45         int it_requeue_pending;         /* waiting to requeue this timer */
  46 #define REQUEUE_PENDING 1
  47         int it_sigev_notify;            /* notify word of sigevent struct */
  48         int it_sigev_signo;             /* signo word of sigevent struct */
  49         sigval_t it_sigev_value;        /* value word of sigevent struct */
  50         struct task_struct *it_process; /* process to send signal to */
  51         struct sigqueue *sigq;          /* signal queue entry. */
  52         union {
  53                 struct {
  54                         struct timer_list timer;
  55                         struct list_head abs_timer_entry; /* clock abs_timer_list */
  56                         struct timespec wall_to_prev;   /* wall_to_monotonic used when set */
  57                         unsigned long incr; /* interval in jiffies */
  58                 } real;
  59                 struct cpu_timer_list cpu;
  60                 struct {
  61                         unsigned int clock;
  62                         unsigned int node;
  63                         unsigned long incr;
  64                         unsigned long expires;
  65                 } mmtimer;
  66         } it;
  67 };
  68
  69 struct k_clock_abs {
  70         struct list_head list;
  71         spinlock_t lock;
  72 };
  73 struct k_clock {
  74         int res;                /* in nano seconds */
  75         int (*clock_getres) (clockid_t which_clock, struct timespec *tp);
  76         struct k_clock_abs *abs_struct;
  77         int (*clock_set) (clockid_t which_clock, struct timespec * tp);
  78         int (*clock_get) (clockid_t which_clock, struct timespec * tp);
  79         int (*timer_create) (struct k_itimer *timer);
  80         int (*nsleep) (clockid_t which_clock, int flags, struct timespec *);
  81         int (*timer_set) (struct k_itimer * timr, int flags,
  82                           struct itimerspec * new_setting,
  83                           struct itimerspec * old_setting);
  84         int (*timer_del) (struct k_itimer * timr);
  85 #define TIMER_RETRY 1
  86         void (*timer_get) (struct k_itimer * timr,
  87                            struct itimerspec * cur_setting);
  88 };
  89
  90 void register_posix_clock(clockid_t clock_id, struct k_clock *new_clock);
  91
  92 /* Error handlers for timer_create, nanosleep and settime */
  93 int do_posix_clock_notimer_create(struct k_itimer *timer);
  94 int do_posix_clock_nonanosleep(clockid_t, int flags, struct timespec *);
  95 int do_posix_clock_nosettime(clockid_t, struct timespec *tp);
  96
  97 /* function to call to trigger timer event */
  98 int posix_timer_event(struct k_itimer *timr, int si_private);
  99
 100 struct now_struct {
 101         unsigned long jiffies;
 102 };
 103
 104 #define posix_get_now(now) (now)->jiffies = jiffies;
 105 #define posix_time_before(timer, now) \
 106                       time_before((timer)->expires, (now)->jiffies)
 107
 108 #define posix_bump_timer(timr, now)                                     \
 109          do {                                                           \
 110               long delta, orun;                                         \
 111               delta = now.jiffies - (timr)->it.real.timer.expires;      \
 112               if (delta >= 0) {                                         \
 113                    orun = 1 + (delta / (timr)->it.real.incr);           \
 114                   (timr)->it.real.timer.expires +=                      \
 115                          orun * (timr)->it.real.incr;                   \
 116                   (timr)->it_overrun += orun;                           \
 117               }                                                         \
 118             }while (0)
 119
 120 int posix_cpu_clock_getres(clockid_t which_clock, struct timespec *);
 121 int posix_cpu_clock_get(clockid_t which_clock, struct timespec *);
 122 int posix_cpu_clock_set(clockid_t which_clock, const struct timespec *tp);
 123 int posix_cpu_timer_create(struct k_itimer *);
 124 int posix_cpu_nsleep(clockid_t, int, struct timespec *);
 125 int posix_cpu_timer_set(struct k_itimer *, int,
 126                         struct itimerspec *, struct itimerspec *);
 127 int posix_cpu_timer_del(struct k_itimer *);
 128 void posix_cpu_timer_get(struct k_itimer *, struct itimerspec *);
 129
 130 void posix_cpu_timer_schedule(struct k_itimer *);
 131
 132 void run_posix_cpu_timers(struct task_struct *);
 133 void posix_cpu_timers_exit(struct task_struct *);
 134 void posix_cpu_timers_exit_group(struct task_struct *);
 135
 136 void set_process_cpu_timer(struct task_struct *, unsigned int,
 137                            cputime_t *, cputime_t *);
 138
 139 #endif