tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 timer_list timer;
55 struct list_head abs_timer_entry; /* clock abs_timer_list */
56 struct timespec wall_to_prev; /* wall_to_monotonic used when set */
57 unsigned long incr; /* interval in jiffies */
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
69struct k_clock_abs {
70 struct list_head list;
71 spinlock_t lock;
72};
73struct k_clock {
74 int res; /* in nano seconds */
75 int (*clock_getres) (clockid_t which_clock, struct timespec *tp);
76 struct k_clock_abs *abs_struct;
77 int (*clock_set) (clockid_t which_clock, struct timespec * tp);
78 int (*clock_get) (clockid_t which_clock, struct timespec * tp);
79 int (*timer_create) (struct k_itimer *timer);
80 int (*nsleep) (clockid_t which_clock, int flags, struct timespec *);
81 int (*timer_set) (struct k_itimer * timr, int flags,
82 struct itimerspec * new_setting,
83 struct itimerspec * old_setting);
84 int (*timer_del) (struct k_itimer * timr);
85#define TIMER_RETRY 1
86 void (*timer_get) (struct k_itimer * timr,
87 struct itimerspec * cur_setting);
88};
89
90void register_posix_clock(clockid_t clock_id, struct k_clock *new_clock);
91
92/* Error handlers for timer_create, nanosleep and settime */
93int do_posix_clock_notimer_create(struct k_itimer *timer);
94int do_posix_clock_nonanosleep(clockid_t, int flags, struct timespec *);
95int do_posix_clock_nosettime(clockid_t, struct timespec *tp);
96
97/* function to call to trigger timer event */
98int posix_timer_event(struct k_itimer *timr, int si_private);
99
100struct now_struct {
101 unsigned long jiffies;
102};
103
104#define posix_get_now(now) (now)->jiffies = jiffies;
105#define posix_time_before(timer, now) \
106 time_before((timer)->expires, (now)->jiffies)
107
108#define posix_bump_timer(timr, now) \
109 do { \
110 long delta, orun; \
111 delta = now.jiffies - (timr)->it.real.timer.expires; \
112 if (delta >= 0) { \
113 orun = 1 + (delta / (timr)->it.real.incr); \
114 (timr)->it.real.timer.expires += \
115 orun * (timr)->it.real.incr; \
116 (timr)->it_overrun += orun; \
117 } \
118 }while (0)
119
120int posix_cpu_clock_getres(clockid_t which_clock, struct timespec *);
121int posix_cpu_clock_get(clockid_t which_clock, struct timespec *);
122int posix_cpu_clock_set(clockid_t which_clock, const struct timespec *tp);
123int posix_cpu_timer_create(struct k_itimer *);
124int posix_cpu_nsleep(clockid_t, int, struct timespec *);
125int posix_cpu_timer_set(struct k_itimer *, int,
126 struct itimerspec *, struct itimerspec *);
127int posix_cpu_timer_del(struct k_itimer *);
128void posix_cpu_timer_get(struct k_itimer *, struct itimerspec *);
129
130void posix_cpu_timer_schedule(struct k_itimer *);
131
132void run_posix_cpu_timers(struct task_struct *);
133void posix_cpu_timers_exit(struct task_struct *);
134void posix_cpu_timers_exit_group(struct task_struct *);
135
136void set_process_cpu_timer(struct task_struct *, unsigned int,
137 cputime_t *, cputime_t *);
138
139#endif