Release 4.12 include/linux/posix-timers.h

#ifndef _linux_POSIX_TIMERS_H

#define _linux_POSIX_TIMERS_H

#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/timex.h>
#include <linux/alarmtimer.h>



struct cpu_timer_list {
	
struct list_head entry;
	

u64 expires, incr;
	
struct task_struct *task;
	
int firing;
};

/*
 * Bit fields within a clockid:
 *
 * The most significant 29 bits hold either a pid or a file descriptor.
 *
 * Bit 2 indicates whether a cpu clock refers to a thread or a process.
 *
 * Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3.
 *
 * A clockid is invalid if bits 2, 1, and 0 are all set.
 */

#define CPUCLOCK_PID(clock)		((pid_t) ~((clock) >> 3))

#define CPUCLOCK_PERTHREAD(clock) \
	(((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)


#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 CLOCKFD			CPUCLOCK_MAX

#define CLOCKFD_MASK		(CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)


#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)


#define FD_TO_CLOCKID(fd)	((~(clockid_t) (fd) << 3) | CLOCKFD)

#define CLOCKID_TO_FD(clk)	((unsigned int) ~((clk) >> 3))

/* POSIX.1b interval timer structure. */

struct k_itimer {
	
struct list_head list;		/* free/ allocate list */
	
struct hlist_node t_hash;
	
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 */
	
struct signal_struct *it_signal;
	union {
		
struct pid *it_pid;	/* pid of process to send signal to */
		
struct task_struct *it_process;	/* for clock_nanosleep */
	};
	
struct sigqueue *sigq;		/* signal queue entry. */
	union {
		struct {
			
struct hrtimer timer;
			
ktime_t interval;
		
} real;
		
struct cpu_timer_list cpu;
		struct {
			
unsigned int clock;
			
unsigned int node;
			
unsigned long incr;
			
unsigned long expires;
		
} mmtimer;
		struct {
			
struct alarm alarmtimer;
			
ktime_t interval;
		
} alarm;
		
struct rcu_head rcu;
	
} it;
};


struct k_clock {
	
int (*clock_getres) (const clockid_t which_clock, struct timespec64 *tp);
	
int (*clock_set) (const clockid_t which_clock,
			  const struct timespec64 *tp);
	
int (*clock_get) (const clockid_t which_clock, struct timespec64 *tp);
	
int (*clock_adj) (const clockid_t which_clock, struct timex *tx);
	
int (*timer_create) (struct k_itimer *timer);
	
int (*nsleep) (const clockid_t which_clock, int flags,
		       struct timespec64 *, struct timespec __user *);
	
long (*nsleep_restart) (struct restart_block *restart_block);
	
int (*timer_set) (struct k_itimer *timr, int flags,
			  struct itimerspec64 *new_setting,
			  struct itimerspec64 *old_setting);
	
int (*timer_del) (struct k_itimer *timr);

#define TIMER_RETRY 1
	
void (*timer_get) (struct k_itimer *timr,
			   struct itimerspec64 *cur_setting);
};

extern struct k_clock clock_posix_cpu;
extern struct k_clock clock_posix_dynamic;

void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock);

/* function to call to trigger timer event */
int posix_timer_event(struct k_itimer *timr, int si_private);

void posix_cpu_timer_schedule(struct k_itimer *timer);

void run_posix_cpu_timers(struct task_struct *task);
void posix_cpu_timers_exit(struct task_struct *task);
void posix_cpu_timers_exit_group(struct task_struct *task);
void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
			   u64 *newval, u64 *oldval);

long clock_nanosleep_restart(struct restart_block *restart_block);

void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);

#endif
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