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#include <linux/timex.h>
8#include <linux/alarmtimer.h>
9
10
11struct cpu_timer_list {
12 struct list_head entry;
13 u64 expires, incr;
14 struct task_struct *task;
15 int firing;
16};
17
18/*
19 * Bit fields within a clockid:
20 *
21 * The most significant 29 bits hold either a pid or a file descriptor.
22 *
23 * Bit 2 indicates whether a cpu clock refers to a thread or a process.
24 *
25 * Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3.
26 *
27 * A clockid is invalid if bits 2, 1, and 0 are all set.
28 */
29#define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3))
30#define CPUCLOCK_PERTHREAD(clock) \
31 (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
32
33#define CPUCLOCK_PERTHREAD_MASK 4
34#define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
35#define CPUCLOCK_CLOCK_MASK 3
36#define CPUCLOCK_PROF 0
37#define CPUCLOCK_VIRT 1
38#define CPUCLOCK_SCHED 2
39#define CPUCLOCK_MAX 3
40#define CLOCKFD CPUCLOCK_MAX
41#define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)
42
43#define MAKE_PROCESS_CPUCLOCK(pid, clock) \
44 ((~(clockid_t) (pid) << 3) | (clockid_t) (clock))
45#define MAKE_THREAD_CPUCLOCK(tid, clock) \
46 MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK)
47
48#define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD)
49#define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3))
50
51/* POSIX.1b interval timer structure. */
52struct k_itimer {
53 struct list_head list; /* free/ allocate list */
54 struct hlist_node t_hash;
55 spinlock_t it_lock;
56 clockid_t it_clock; /* which timer type */
57 timer_t it_id; /* timer id */
58 int it_overrun; /* overrun on pending signal */
59 int it_overrun_last; /* overrun on last delivered signal */
60 int it_requeue_pending; /* waiting to requeue this timer */
61#define REQUEUE_PENDING 1
62 int it_sigev_notify; /* notify word of sigevent struct */
63 struct signal_struct *it_signal;
64 union {
65 struct pid *it_pid; /* pid of process to send signal to */
66 struct task_struct *it_process; /* for clock_nanosleep */
67 };
68 struct sigqueue *sigq; /* signal queue entry. */
69 union {
70 struct {
71 struct hrtimer timer;
72 ktime_t interval;
73 } real;
74 struct cpu_timer_list cpu;
75 struct {
76 unsigned int clock;
77 unsigned int node;
78 unsigned long incr;
79 unsigned long expires;
80 } mmtimer;
81 struct {
82 struct alarm alarmtimer;
83 ktime_t interval;
84 } alarm;
85 struct rcu_head rcu;
86 } it;
87};
88
89struct k_clock {
90 int (*clock_getres) (const clockid_t which_clock, struct timespec64 *tp);
91 int (*clock_set) (const clockid_t which_clock,
92 const struct timespec64 *tp);
93 int (*clock_get) (const clockid_t which_clock, struct timespec64 *tp);
94 int (*clock_adj) (const clockid_t which_clock, struct timex *tx);
95 int (*timer_create) (struct k_itimer *timer);
96 int (*nsleep) (const clockid_t which_clock, int flags,
97 struct timespec64 *, struct timespec __user *);
98 long (*nsleep_restart) (struct restart_block *restart_block);
99 int (*timer_set) (struct k_itimer *timr, int flags,
100 struct itimerspec64 *new_setting,
101 struct itimerspec64 *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 itimerspec64 *cur_setting);
106};
107
108extern struct k_clock clock_posix_cpu;
109extern struct k_clock clock_posix_dynamic;
110
111void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock);
112
113/* function to call to trigger timer event */
114int posix_timer_event(struct k_itimer *timr, int si_private);
115
116void posix_cpu_timer_schedule(struct k_itimer *timer);
117
118void 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);
121void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
122 u64 *newval, u64 *oldval);
123
124long clock_nanosleep_restart(struct restart_block *restart_block);
125
126void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
127
128#endif