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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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>
Richard Cochranf1f1d5e2011-02-01 13:52:26 +00007#include <linux/timex.h>
John Stultz9a7adcf2011-01-11 09:54:33 -08008#include <linux/alarmtimer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
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
Richard Cochran81e294c2011-02-01 13:52:32 +000022/*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3))
34#define CPUCLOCK_PERTHREAD(clock) \
35 (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
Richard Cochran0606f422011-02-01 13:52:35 +000036
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#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
Richard Cochran81e294c2011-02-01 13:52:32 +000044#define CLOCKFD CPUCLOCK_MAX
45#define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
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
Richard Cochran0606f422011-02-01 13:52:35 +000052#define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD)
53#define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3))
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055/* 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 */
Thomas Gleixner2a698972006-01-09 20:52:28 -080063 int it_requeue_pending; /* waiting to requeue this timer */
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#define REQUEUE_PENDING 1
65 int it_sigev_notify; /* notify word of sigevent struct */
Oleg Nesterov27af4242008-12-01 14:18:13 -080066 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 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 struct sigqueue *sigq; /* signal queue entry. */
72 union {
73 struct {
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -080074 struct hrtimer timer;
75 ktime_t interval;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 } 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;
John Stultz9a7adcf2011-01-11 09:54:33 -080084 struct alarm alarmtimer;
Eric Dumazet8af08872011-05-24 11:12:58 +020085 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 } it;
87};
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089struct k_clock {
Thomas Gleixnera924b042006-01-09 20:52:27 -080090 int (*clock_getres) (const clockid_t which_clock, struct timespec *tp);
Richard Cochran1e6d7672011-02-01 13:50:58 +000091 int (*clock_set) (const clockid_t which_clock,
92 const struct timespec *tp);
Thomas Gleixnera924b042006-01-09 20:52:27 -080093 int (*clock_get) (const clockid_t which_clock, struct timespec * tp);
Richard Cochranf1f1d5e2011-02-01 13:52:26 +000094 int (*clock_adj) (const clockid_t which_clock, struct timex *tx);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 int (*timer_create) (struct k_itimer *timer);
Thomas Gleixner2a698972006-01-09 20:52:28 -080096 int (*nsleep) (const clockid_t which_clock, int flags,
Thomas Gleixner97735f22006-01-09 20:52:37 -080097 struct timespec *, struct timespec __user *);
Toyo Abe1711ef32006-09-29 02:00:28 -070098 long (*nsleep_restart) (struct restart_block *restart_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 int (*timer_set) (struct k_itimer * timr, int flags,
100 struct itimerspec * new_setting,
101 struct itimerspec * old_setting);
102 int (*timer_del) (struct k_itimer * timr);
103#define TIMER_RETRY 1
104 void (*timer_get) (struct k_itimer * timr,
105 struct itimerspec * cur_setting);
106};
107
Thomas Gleixner19769452011-02-01 13:51:06 +0000108extern struct k_clock clock_posix_cpu;
Richard Cochran0606f422011-02-01 13:52:35 +0000109extern struct k_clock clock_posix_dynamic;
Thomas Gleixner19769452011-02-01 13:51:06 +0000110
Thomas Gleixner52708732011-02-02 12:10:09 +0100111void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113/* function to call to trigger timer event */
114int posix_timer_event(struct k_itimer *timr, int si_private);
115
Thomas Gleixner2a698972006-01-09 20:52:28 -0800116void posix_cpu_timer_schedule(struct k_itimer *timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Thomas Gleixner2a698972006-01-09 20:52:28 -0800118void run_posix_cpu_timers(struct task_struct *task);
119void posix_cpu_timers_exit(struct task_struct *task);
120void posix_cpu_timers_exit_group(struct task_struct *task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Thomas Gleixner2a698972006-01-09 20:52:28 -0800122void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
123 cputime_t *newval, cputime_t *oldval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
Toyo Abe1711ef32006-09-29 02:00:28 -0700125long clock_nanosleep_restart(struct restart_block *restart_block);
126
Jiri Slaby5ab46b32009-08-28 14:05:12 +0200127void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
Frank Mayharf06febc2008-09-12 09:54:39 -0700128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129#endif