linux/include/linux/posix-timers.h
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   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#include <linux/timex.h>
   8#include <linux/alarmtimer.h>
   9
  10union cpu_time_count {
  11        cputime_t cpu;
  12        unsigned long long sched;
  13};
  14
  15struct cpu_timer_list {
  16        struct list_head entry;
  17        union cpu_time_count expires, incr;
  18        struct task_struct *task;
  19        int firing;
  20};
  21
  22/*
  23 * Bit fields within a clockid:
  24 *
  25 * The most significant 29 bits hold either a pid or a file descriptor.
  26 *
  27 * Bit 2 indicates whether a cpu clock refers to a thread or a process.
  28 *
  29 * Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3.
  30 *
  31 * A clockid is invalid if bits 2, 1, and 0 are all set.
  32 */
  33#define CPUCLOCK_PID(clock)             ((pid_t) ~((clock) >> 3))
  34#define CPUCLOCK_PERTHREAD(clock) \
  35        (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
  36
  37#define CPUCLOCK_PERTHREAD_MASK 4
  38#define CPUCLOCK_WHICH(clock)   ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
  39#define CPUCLOCK_CLOCK_MASK     3
  40#define CPUCLOCK_PROF           0
  41#define CPUCLOCK_VIRT           1
  42#define CPUCLOCK_SCHED          2
  43#define CPUCLOCK_MAX            3
  44#define CLOCKFD                 CPUCLOCK_MAX
  45#define CLOCKFD_MASK            (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)
  46
  47#define MAKE_PROCESS_CPUCLOCK(pid, clock) \
  48        ((~(clockid_t) (pid) << 3) | (clockid_t) (clock))
  49#define MAKE_THREAD_CPUCLOCK(tid, clock) \
  50        MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK)
  51
  52#define FD_TO_CLOCKID(fd)       ((~(clockid_t) (fd) << 3) | CLOCKFD)
  53#define CLOCKID_TO_FD(clk)      ((unsigned int) ~((clk) >> 3))
  54
  55/* POSIX.1b interval timer structure. */
  56struct k_itimer {
  57        struct list_head list;          /* free/ allocate list */
  58        spinlock_t it_lock;
  59        clockid_t it_clock;             /* which timer type */
  60        timer_t it_id;                  /* timer id */
  61        int it_overrun;                 /* overrun on pending signal  */
  62        int it_overrun_last;            /* overrun on last delivered signal */
  63        int it_requeue_pending;         /* waiting to requeue this timer */
  64#define REQUEUE_PENDING 1
  65        int it_sigev_notify;            /* notify word of sigevent struct */
  66        struct signal_struct *it_signal;
  67        union {
  68                struct pid *it_pid;     /* pid of process to send signal to */
  69                struct task_struct *it_process; /* for clock_nanosleep */
  70        };
  71        struct sigqueue *sigq;          /* signal queue entry. */
  72        union {
  73                struct {
  74                        struct hrtimer timer;
  75                        ktime_t interval;
  76                } real;
  77                struct cpu_timer_list cpu;
  78                struct {
  79                        unsigned int clock;
  80                        unsigned int node;
  81                        unsigned long incr;
  82                        unsigned long expires;
  83                } mmtimer;
  84                struct {
  85                        struct alarm alarmtimer;
  86                        ktime_t interval;
  87                } alarm;
  88                struct rcu_head rcu;
  89        } it;
  90};
  91
  92struct k_clock {
  93        int (*clock_getres) (const clockid_t which_clock, struct timespec *tp);
  94        int (*clock_set) (const clockid_t which_clock,
  95                          const struct timespec *tp);
  96        int (*clock_get) (const clockid_t which_clock, struct timespec * tp);
  97        int (*clock_adj) (const clockid_t which_clock, struct timex *tx);
  98        int (*timer_create) (struct k_itimer *timer);
  99        int (*nsleep) (const clockid_t which_clock, int flags,
 100                       struct timespec *, struct timespec __user *);
 101        long (*nsleep_restart) (struct restart_block *restart_block);
 102        int (*timer_set) (struct k_itimer * timr, int flags,
 103                          struct itimerspec * new_setting,
 104                          struct itimerspec * old_setting);
 105        int (*timer_del) (struct k_itimer * timr);
 106#define TIMER_RETRY 1
 107        void (*timer_get) (struct k_itimer * timr,
 108                           struct itimerspec * cur_setting);
 109};
 110
 111extern struct k_clock clock_posix_cpu;
 112extern struct k_clock clock_posix_dynamic;
 113
 114void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock);
 115
 116/* function to call to trigger timer event */
 117int posix_timer_event(struct k_itimer *timr, int si_private);
 118
 119void posix_cpu_timer_schedule(struct k_itimer *timer);
 120
 121void run_posix_cpu_timers(struct task_struct *task);
 122void posix_cpu_timers_exit(struct task_struct *task);
 123void posix_cpu_timers_exit_group(struct task_struct *task);
 124
 125void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
 126                           cputime_t *newval, cputime_t *oldval);
 127
 128long clock_nanosleep_restart(struct restart_block *restart_block);
 129
 130void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
 131
 132#endif
 133
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