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         struct signal_struct *it_signal;
  49         union {
  50                 struct pid *it_pid;     /* pid of process to send signal to */
  51                 struct task_struct *it_process; /* for clock_nanosleep */
  52         };
  53         struct sigqueue *sigq;          /* signal queue entry. */
  54         union {
  55                 struct {
  56                         struct hrtimer timer;
  57                         ktime_t interval;
  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 {
  70         int res;                /* in nanoseconds */
  71         int (*clock_getres) (const clockid_t which_clock, struct timespec *tp);
  72         int (*clock_set) (const clockid_t which_clock, struct timespec * tp);
  73         int (*clock_get) (const clockid_t which_clock, struct timespec * tp);
  74         int (*timer_create) (struct k_itimer *timer);
  75         int (*nsleep) (const clockid_t which_clock, int flags,
  76                        struct timespec *, struct timespec __user *);
  77         long (*nsleep_restart) (struct restart_block *restart_block);
  78         int (*timer_set) (struct k_itimer * timr, int flags,
  79                           struct itimerspec * new_setting,
  80                           struct itimerspec * old_setting);
  81         int (*timer_del) (struct k_itimer * timr);
  82 #define TIMER_RETRY 1
  83         void (*timer_get) (struct k_itimer * timr,
  84                            struct itimerspec * cur_setting);
  85 };
  86
  87 void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock);
  88
  89 /* error handlers for timer_create, nanosleep and settime */
  90 int do_posix_clock_nonanosleep(const clockid_t, int flags, struct timespec *,
  91                                struct timespec __user *);
  92 int do_posix_clock_nosettime(const clockid_t, struct timespec *tp);
  93
  94 /* function to call to trigger timer event */
  95 int posix_timer_event(struct k_itimer *timr, int si_private);
  96
  97 int posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *ts);
  98 int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *ts);
  99 int posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *ts);
 100 int posix_cpu_timer_create(struct k_itimer *timer);
 101 int posix_cpu_nsleep(const clockid_t which_clock, int flags,
 102                      struct timespec *rqtp, struct timespec __user *rmtp);
 103 long posix_cpu_nsleep_restart(struct restart_block *restart_block);
 104 int posix_cpu_timer_set(struct k_itimer *timer, int flags,
 105                         struct itimerspec *new, struct itimerspec *old);
 106 int posix_cpu_timer_del(struct k_itimer *timer);
 107 void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp);
 108
 109 void posix_cpu_timer_schedule(struct k_itimer *timer);
 110
 111 void run_posix_cpu_timers(struct task_struct *task);
 112 void posix_cpu_timers_exit(struct task_struct *task);
 113 void posix_cpu_timers_exit_group(struct task_struct *task);
 114
 115 void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
 116                            cputime_t *newval, cputime_t *oldval);
 117
 118 long clock_nanosleep_restart(struct restart_block *restart_block);
 119
 120 void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
 121
 122 #endif