1 #ifndef _linux_POSIX_TIMERS_H
2 #define _linux_POSIX_TIMERS_H
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>
12 struct cpu_timer_list {
13 struct list_head entry;
15 struct task_struct *task;
20 * Bit fields within a clockid:
22 * The most significant 29 bits hold either a pid or a file descriptor.
24 * Bit 2 indicates whether a cpu clock refers to a thread or a process.
26 * Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3.
28 * A clockid is invalid if bits 2, 1, and 0 are all set.
30 #define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3))
31 #define CPUCLOCK_PERTHREAD(clock) \
32 (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
34 #define CPUCLOCK_PERTHREAD_MASK 4
35 #define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
36 #define CPUCLOCK_CLOCK_MASK 3
37 #define CPUCLOCK_PROF 0
38 #define CPUCLOCK_VIRT 1
39 #define CPUCLOCK_SCHED 2
40 #define CPUCLOCK_MAX 3
41 #define CLOCKFD CPUCLOCK_MAX
42 #define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)
44 #define MAKE_PROCESS_CPUCLOCK(pid, clock) \
45 ((~(clockid_t) (pid) << 3) | (clockid_t) (clock))
46 #define MAKE_THREAD_CPUCLOCK(tid, clock) \
47 MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK)
49 #define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD)
50 #define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3))
52 /* POSIX.1b interval timer structure. */
54 struct list_head list; /* free/ allocate list */
55 struct hlist_node t_hash;
57 clockid_t it_clock; /* which timer type */
58 timer_t it_id; /* timer id */
59 int it_overrun; /* overrun on pending signal */
60 int it_overrun_last; /* overrun on last delivered signal */
61 int it_requeue_pending; /* waiting to requeue this timer */
62 #define REQUEUE_PENDING 1
63 int it_sigev_notify; /* notify word of sigevent struct */
64 struct signal_struct *it_signal;
66 struct pid *it_pid; /* pid of process to send signal to */
67 struct task_struct *it_process; /* for clock_nanosleep */
69 struct sigqueue *sigq; /* signal queue entry. */
75 struct cpu_timer_list cpu;
77 struct alarm alarmtimer;
85 int (*clock_getres) (const clockid_t which_clock, struct timespec64 *tp);
86 int (*clock_set) (const clockid_t which_clock,
87 const struct timespec64 *tp);
88 int (*clock_get) (const clockid_t which_clock, struct timespec64 *tp);
89 int (*clock_adj) (const clockid_t which_clock, struct timex *tx);
90 int (*timer_create) (struct k_itimer *timer);
91 int (*nsleep) (const clockid_t which_clock, int flags,
92 struct timespec64 *, struct timespec __user *);
93 long (*nsleep_restart) (struct restart_block *restart_block);
94 int (*timer_set) (struct k_itimer *timr, int flags,
95 struct itimerspec64 *new_setting,
96 struct itimerspec64 *old_setting);
97 int (*timer_del) (struct k_itimer *timr);
99 void (*timer_get) (struct k_itimer *timr,
100 struct itimerspec64 *cur_setting);
103 extern const struct k_clock clock_posix_cpu;
104 extern const struct k_clock clock_posix_dynamic;
105 extern const struct k_clock clock_process;
106 extern const struct k_clock clock_thread;
107 extern const struct k_clock alarm_clock;
109 /* function to call to trigger timer event */
110 int posix_timer_event(struct k_itimer *timr, int si_private);
112 void posix_cpu_timer_schedule(struct k_itimer *timer);
114 void run_posix_cpu_timers(struct task_struct *task);
115 void posix_cpu_timers_exit(struct task_struct *task);
116 void posix_cpu_timers_exit_group(struct task_struct *task);
117 void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
118 u64 *newval, u64 *oldval);
120 long clock_nanosleep_restart(struct restart_block *restart_block);
122 void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
124 void do_schedule_next_timer(struct siginfo *info);