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>
11 static inline unsigned long long cputime_to_expires(cputime_t expires)
13 return (__force unsigned long long)expires;
16 static inline cputime_t expires_to_cputime(unsigned long long expires)
18 return (__force cputime_t)expires;
21 struct cpu_timer_list {
22 struct list_head entry;
23 unsigned long long expires, incr;
24 struct task_struct *task;
29 * Bit fields within a clockid:
31 * The most significant 29 bits hold either a pid or a file descriptor.
33 * Bit 2 indicates whether a cpu clock refers to a thread or a process.
35 * Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3.
37 * A clockid is invalid if bits 2, 1, and 0 are all set.
39 #define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3))
40 #define CPUCLOCK_PERTHREAD(clock) \
41 (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
43 #define CPUCLOCK_PERTHREAD_MASK 4
44 #define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
45 #define CPUCLOCK_CLOCK_MASK 3
46 #define CPUCLOCK_PROF 0
47 #define CPUCLOCK_VIRT 1
48 #define CPUCLOCK_SCHED 2
49 #define CPUCLOCK_MAX 3
50 #define CLOCKFD CPUCLOCK_MAX
51 #define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)
53 #define MAKE_PROCESS_CPUCLOCK(pid, clock) \
54 ((~(clockid_t) (pid) << 3) | (clockid_t) (clock))
55 #define MAKE_THREAD_CPUCLOCK(tid, clock) \
56 MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK)
58 #define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD)
59 #define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3))
61 /* POSIX.1b interval timer structure. */
63 struct list_head list; /* free/ allocate list */
64 struct hlist_node t_hash;
66 clockid_t it_clock; /* which timer type */
67 timer_t it_id; /* timer id */
68 int it_overrun; /* overrun on pending signal */
69 int it_overrun_last; /* overrun on last delivered signal */
70 int it_requeue_pending; /* waiting to requeue this timer */
71 #define REQUEUE_PENDING 1
72 int it_sigev_notify; /* notify word of sigevent struct */
73 struct signal_struct *it_signal;
75 struct pid *it_pid; /* pid of process to send signal to */
76 struct task_struct *it_process; /* for clock_nanosleep */
78 struct sigqueue *sigq; /* signal queue entry. */
84 struct cpu_timer_list cpu;
89 unsigned long expires;
92 struct alarm alarmtimer;
100 int (*clock_getres) (const clockid_t which_clock, struct timespec *tp);
101 int (*clock_set) (const clockid_t which_clock,
102 const struct timespec *tp);
103 int (*clock_get) (const clockid_t which_clock, struct timespec * tp);
104 int (*clock_adj) (const clockid_t which_clock, struct timex *tx);
105 int (*timer_create) (struct k_itimer *timer);
106 int (*nsleep) (const clockid_t which_clock, int flags,
107 struct timespec *, struct timespec __user *);
108 long (*nsleep_restart) (struct restart_block *restart_block);
109 int (*timer_set) (struct k_itimer * timr, int flags,
110 struct itimerspec * new_setting,
111 struct itimerspec * old_setting);
112 int (*timer_del) (struct k_itimer * timr);
113 #define TIMER_RETRY 1
114 void (*timer_get) (struct k_itimer * timr,
115 struct itimerspec * cur_setting);
118 extern struct k_clock clock_posix_cpu;
119 extern struct k_clock clock_posix_dynamic;
121 void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock);
123 /* function to call to trigger timer event */
124 int posix_timer_event(struct k_itimer *timr, int si_private);
126 void posix_cpu_timer_schedule(struct k_itimer *timer);
128 void run_posix_cpu_timers(struct task_struct *task);
129 void posix_cpu_timers_exit(struct task_struct *task);
130 void posix_cpu_timers_exit_group(struct task_struct *task);
132 bool posix_cpu_timers_can_stop_tick(struct task_struct *tsk);
134 void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
135 cputime_t *newval, cputime_t *oldval);
137 long clock_nanosleep_restart(struct restart_block *restart_block);
139 void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);