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posix-timers.h
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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 
12  unsigned long long sched;
13 };
14 
16  struct list_head entry;
17  union cpu_time_count expires, incr;
18  struct task_struct *task;
19  int firing;
20 };
21 
22 /*
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  */
33 #define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3))
34 #define CPUCLOCK_PERTHREAD(clock) \
35  (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
36 
37 #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
44 #define CLOCKFD CPUCLOCK_MAX
45 #define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)
46 
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 
52 #define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD)
53 #define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3))
54 
55 /* POSIX.1b interval timer structure. */
56 struct k_itimer {
57  struct list_head list; /* free/ allocate list */
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 */
63  int it_requeue_pending; /* waiting to requeue this timer */
64 #define REQUEUE_PENDING 1
65  int it_sigev_notify; /* notify word of sigevent struct */
67  union {
68  struct pid *it_pid; /* pid of process to send signal to */
69  struct task_struct *it_process; /* for clock_nanosleep */
70  };
71  struct sigqueue *sigq; /* signal queue entry. */
72  union {
73  struct {
74  struct hrtimer timer;
76  } real;
78  struct {
79  unsigned int clock;
80  unsigned int node;
81  unsigned long incr;
82  unsigned long expires;
83  } mmtimer;
84  struct {
85  struct alarm alarmtimer;
87  } alarm;
88  struct rcu_head rcu;
89  } it;
90 };
91 
92 struct k_clock {
93  int (*clock_getres) (const clockid_t which_clock, struct timespec *tp);
94  int (*clock_set) (const clockid_t which_clock,
95  const struct timespec *tp);
96  int (*clock_get) (const clockid_t which_clock, struct timespec * tp);
97  int (*clock_adj) (const clockid_t which_clock, struct timex *tx);
99  int (*nsleep) (const clockid_t which_clock, int flags,
100  struct timespec *, struct timespec __user *);
102  int (*timer_set) (struct k_itimer * timr, int flags,
103  struct itimerspec * new_setting,
104  struct itimerspec * old_setting);
105  int (*timer_del) (struct k_itimer * timr);
106 #define TIMER_RETRY 1
107  void (*timer_get) (struct k_itimer * timr,
108  struct itimerspec * cur_setting);
109 };
110 
111 extern struct k_clock clock_posix_cpu;
112 extern struct k_clock clock_posix_dynamic;
113 
114 void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock);
115 
116 /* function to call to trigger timer event */
117 int posix_timer_event(struct k_itimer *timr, int si_private);
118 
120 
124 
125 void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
126  cputime_t *newval, cputime_t *oldval);
127 
129 
130 void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
131 
132 #endif