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 hrtimer timer;
  55                         ktime_t interval;
  56                 } real;
  57                 struct cpu_timer_list cpu;
  58                 struct {
  59                         unsigned int clock;
  60                         unsigned int node;
  61                         unsigned long incr;
  62                         unsigned long expires;
  63                 } mmtimer;
  64         } it;
  65 };
  66
  67 struct k_clock {
  68         int res;                /* in nanoseconds */
  69         int (*clock_getres) (const clockid_t which_clock, struct timespec *tp);
  70         int (*clock_set) (const clockid_t which_clock, struct timespec * tp);
  71         int (*clock_get) (const clockid_t which_clock, struct timespec * tp);
  72         int (*timer_create) (struct k_itimer *timer);
  73         int (*nsleep) (const clockid_t which_clock, int flags,
  74                        struct timespec *, struct timespec __user *);
  75         int (*timer_set) (struct k_itimer * timr, int flags,
  76                           struct itimerspec * new_setting,
  77                           struct itimerspec * old_setting);
  78         int (*timer_del) (struct k_itimer * timr);
  79 #define TIMER_RETRY 1
  80         void (*timer_get) (struct k_itimer * timr,
  81                            struct itimerspec * cur_setting);
  82 };
  83
  84 void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock);
  85
  86 /* error handlers for timer_create, nanosleep and settime */
  87 int do_posix_clock_nonanosleep(const clockid_t, int flags, struct timespec *,
  88                                struct timespec __user *);
  89 int do_posix_clock_nosettime(const clockid_t, struct timespec *tp);
  90
  91 /* function to call to trigger timer event */
  92 int posix_timer_event(struct k_itimer *timr, int si_private);
  93
  94 int posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *ts);
  95 int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *ts);
  96 int posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *ts);
  97 int posix_cpu_timer_create(struct k_itimer *timer);
  98 int posix_cpu_nsleep(const clockid_t which_clock, int flags,
  99                      struct timespec *rqtp, struct timespec __user *rmtp);
 100 int posix_cpu_timer_set(struct k_itimer *timer, int flags,
 101                         struct itimerspec *new, struct itimerspec *old);
 102 int posix_cpu_timer_del(struct k_itimer *timer);
 103 void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp);
 104
 105 void posix_cpu_timer_schedule(struct k_itimer *timer);
 106
 107 void run_posix_cpu_timers(struct task_struct *task);
 108 void posix_cpu_timers_exit(struct task_struct *task);
 109 void posix_cpu_timers_exit_group(struct task_struct *task);
 110
 111 void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
 112                            cputime_t *newval, cputime_t *oldval);
 113
 114 #endif