LXR linux/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
   8union cpu_time_count {
   9        cputime_t cpu;
  10        unsigned long long sched;
  11};
  12
  13struct 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. */
  38struct 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
  67struct 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        long (*nsleep_restart) (struct restart_block *restart_block);
  76        int (*timer_set) (struct k_itimer * timr, int flags,
  77                          struct itimerspec * new_setting,
  78                          struct itimerspec * old_setting);
  79        int (*timer_del) (struct k_itimer * timr);
  80#define TIMER_RETRY 1
  81        void (*timer_get) (struct k_itimer * timr,
  82                           struct itimerspec * cur_setting);
  83};
  84
  85void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock);
  86
  87/* error handlers for timer_create, nanosleep and settime */
  88int do_posix_clock_nonanosleep(const clockid_t, int flags, struct timespec *,
  89                               struct timespec __user *);
  90int do_posix_clock_nosettime(const clockid_t, struct timespec *tp);
  91
  92/* function to call to trigger timer event */
  93int posix_timer_event(struct k_itimer *timr, int si_private);
  94
  95int posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *ts);
  96int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *ts);
  97int posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *ts);
  98int posix_cpu_timer_create(struct k_itimer *timer);
  99int posix_cpu_nsleep(const clockid_t which_clock, int flags,
 100                     struct timespec *rqtp, struct timespec __user *rmtp);
 101long posix_cpu_nsleep_restart(struct restart_block *restart_block);
 102int posix_cpu_timer_set(struct k_itimer *timer, int flags,
 103                        struct itimerspec *new, struct itimerspec *old);
 104int posix_cpu_timer_del(struct k_itimer *timer);
 105void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp);
 106
 107void posix_cpu_timer_schedule(struct k_itimer *timer);
 108
 109void run_posix_cpu_timers(struct task_struct *task);
 110void posix_cpu_timers_exit(struct task_struct *task);
 111void posix_cpu_timers_exit_group(struct task_struct *task);
 112
 113void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
 114                           cputime_t *newval, cputime_t *oldval);
 115
 116long clock_nanosleep_restart(struct restart_block *restart_block);
 117
 118#endif
 119