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 #define REQUEUE_PENDING 1
55 * struct k_itimer - POSIX.1b interval timer structure.
56 * @list: List head for binding the timer to signals->posix_timers
57 * @t_hash: Entry in the posix timer hash table
58 * @it_lock: Lock protecting the timer
59 * @it_clock: The posix timer clock id
60 * @it_id: The posix timer id for identifying the timer
61 * @it_overrun: The overrun counter for pending signals
62 * @it_overrun_last: The overrun at the time of the last delivered signal
63 * @it_requeue_pending: Indicator that timer waits for being requeued on
65 * @it_sigev_notify: The notify word of sigevent struct for signal delivery
66 * @it_signal: Pointer to the creators signal struct
67 * @it_pid: The pid of the process/task targeted by the signal
68 * @it_process: The task to wakeup on clock_nanosleep (CPU timers)
69 * @sigq: Pointer to preallocated sigqueue
70 * @it: Union representing the various posix timer type
71 * internals. Also used for rcu freeing the timer.
74 struct list_head list;
75 struct hlist_node t_hash;
81 int it_requeue_pending;
83 struct signal_struct *it_signal;
86 struct task_struct *it_process;
88 struct sigqueue *sigq;
94 struct cpu_timer_list cpu;
96 struct alarm alarmtimer;
103 void run_posix_cpu_timers(struct task_struct *task);
104 void posix_cpu_timers_exit(struct task_struct *task);
105 void posix_cpu_timers_exit_group(struct task_struct *task);
106 void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
107 u64 *newval, u64 *oldval);
109 long clock_nanosleep_restart(struct restart_block *restart_block);
111 void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
113 void do_schedule_next_timer(struct siginfo *info);