posix-timers.h
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#ifndef _linux_POSIX_TIMERS_H
#define _linux_POSIX_TIMERS_H
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/sched.h>
union cpu_time_count {
cputime_t cpu;
unsigned long long sched;
};
struct cpu_timer_list {
struct list_head entry;
union cpu_time_count expires, incr;
struct task_struct *task;
int firing;
};
#define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3))
#define CPUCLOCK_PERTHREAD(clock) \
(((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
#define CPUCLOCK_PID_MASK 7
#define CPUCLOCK_PERTHREAD_MASK 4
#define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
#define CPUCLOCK_CLOCK_MASK 3
#define CPUCLOCK_PROF 0
#define CPUCLOCK_VIRT 1
#define CPUCLOCK_SCHED 2
#define CPUCLOCK_MAX 3
#define MAKE_PROCESS_CPUCLOCK(pid, clock) \
((~(clockid_t) (pid) << 3) | (clockid_t) (clock))
#define MAKE_THREAD_CPUCLOCK(tid, clock) \
MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK)
/* POSIX.1b interval timer structure. */
struct k_itimer {
struct list_head list; /* free/ allocate list */
spinlock_t it_lock;
clockid_t it_clock; /* which timer type */
timer_t it_id; /* timer id */
int it_overrun; /* overrun on pending signal */
int it_overrun_last; /* overrun on last delivered signal */
int it_requeue_pending; /* waiting to requeue this timer */
#define REQUEUE_PENDING 1
int it_sigev_notify; /* notify word of sigevent struct */
int it_sigev_signo; /* signo word of sigevent struct */
sigval_t it_sigev_value; /* value word of sigevent struct */
struct task_struct *it_process; /* process to send signal to */
struct sigqueue *sigq; /* signal queue entry. */
union {
struct {
struct timer_list timer;
struct list_head abs_timer_entry; /* clock abs_timer_list */
struct timespec wall_to_prev; /* wall_to_monotonic used when set */
unsigned long incr; /* interval in jiffies */
} real;
struct cpu_timer_list cpu;
struct {
unsigned int clock;
unsigned int node;
unsigned long incr;
unsigned long expires;
} mmtimer;
} it;
};
struct k_clock_abs {
struct list_head list;
spinlock_t lock;
};
struct k_clock {
int res; /* in nano seconds */
int (*clock_getres) (clockid_t which_clock, struct timespec *tp);
struct k_clock_abs *abs_struct;
int (*clock_set) (clockid_t which_clock, struct timespec * tp);
int (*clock_get) (clockid_t which_clock, struct timespec * tp);
int (*timer_create) (struct k_itimer *timer);
int (*nsleep) (clockid_t which_clock, int flags, struct timespec *);
int (*timer_set) (struct k_itimer * timr, int flags,
struct itimerspec * new_setting,
struct itimerspec * old_setting);
int (*timer_del) (struct k_itimer * timr);
#define TIMER_RETRY 1
void (*timer_get) (struct k_itimer * timr,
struct itimerspec * cur_setting);
};
void register_posix_clock(clockid_t clock_id, struct k_clock *new_clock);
/* Error handlers for timer_create, nanosleep and settime */
int do_posix_clock_notimer_create(struct k_itimer *timer);
int do_posix_clock_nonanosleep(clockid_t, int flags, struct timespec *);
int do_posix_clock_nosettime(clockid_t, struct timespec *tp);
/* function to call to trigger timer event */
int posix_timer_event(struct k_itimer *timr, int si_private);
struct now_struct {
unsigned long jiffies;
};
#define posix_get_now(now) (now)->jiffies = jiffies;
#define posix_time_before(timer, now) \
time_before((timer)->expires, (now)->jiffies)
#define posix_bump_timer(timr, now) \
do { \
long delta, orun; \
delta = now.jiffies - (timr)->it.real.timer.expires; \
if (delta >= 0) { \
orun = 1 + (delta / (timr)->it.real.incr); \
(timr)->it.real.timer.expires += \
orun * (timr)->it.real.incr; \
(timr)->it_overrun += orun; \
} \
}while (0)
int posix_cpu_clock_getres(clockid_t which_clock, struct timespec *);
int posix_cpu_clock_get(clockid_t which_clock, struct timespec *);
int posix_cpu_clock_set(clockid_t which_clock, const struct timespec *tp);
int posix_cpu_timer_create(struct k_itimer *);
int posix_cpu_nsleep(clockid_t, int, struct timespec *);
int posix_cpu_timer_set(struct k_itimer *, int,
struct itimerspec *, struct itimerspec *);
int posix_cpu_timer_del(struct k_itimer *);
void posix_cpu_timer_get(struct k_itimer *, struct itimerspec *);
void posix_cpu_timer_schedule(struct k_itimer *);
void run_posix_cpu_timers(struct task_struct *);
void posix_cpu_timers_exit(struct task_struct *);
void posix_cpu_timers_exit_group(struct task_struct *);
void set_process_cpu_timer(struct task_struct *, unsigned int,
cputime_t *, cputime_t *);
#endif