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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 | ||
10 | ||
11 | static inline unsigned long long cputime_to_expires(cputime_t expires) | |
12 | { | |
13 | return (__force unsigned long long)expires; | |
14 | } | |
15 | ||
16 | static inline cputime_t expires_to_cputime(unsigned long long expires) | |
17 | { | |
18 | return (__force cputime_t)expires; | |
19 | } | |
20 | ||
21 | struct cpu_timer_list { | |
22 | struct list_head entry; | |
23 | unsigned long long expires, incr; | |
24 | struct task_struct *task; | |
25 | int firing; | |
26 | }; | |
27 | ||
28 | /* | |
29 | * Bit fields within a clockid: | |
30 | * | |
31 | * The most significant 29 bits hold either a pid or a file descriptor. | |
32 | * | |
33 | * Bit 2 indicates whether a cpu clock refers to a thread or a process. | |
34 | * | |
35 | * Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3. | |
36 | * | |
37 | * A clockid is invalid if bits 2, 1, and 0 are all set. | |
38 | */ | |
39 | #define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3)) | |
40 | #define CPUCLOCK_PERTHREAD(clock) \ | |
41 | (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0) | |
42 | ||
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) | |
52 | ||
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) | |
57 | ||
58 | #define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD) | |
59 | #define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3)) | |
60 | ||
61 | /* POSIX.1b interval timer structure. */ | |
62 | struct k_itimer { | |
63 | struct list_head list; /* free/ allocate list */ | |
64 | struct hlist_node t_hash; | |
65 | spinlock_t it_lock; | |
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; | |
74 | union { | |
75 | struct pid *it_pid; /* pid of process to send signal to */ | |
76 | struct task_struct *it_process; /* for clock_nanosleep */ | |
77 | }; | |
78 | struct sigqueue *sigq; /* signal queue entry. */ | |
79 | union { | |
80 | struct { | |
81 | struct hrtimer timer; | |
82 | ktime_t interval; | |
83 | } real; | |
84 | struct cpu_timer_list cpu; | |
85 | struct { | |
86 | unsigned int clock; | |
87 | unsigned int node; | |
88 | unsigned long incr; | |
89 | unsigned long expires; | |
90 | } mmtimer; | |
91 | struct { | |
92 | struct alarm alarmtimer; | |
93 | ktime_t interval; | |
94 | } alarm; | |
95 | struct rcu_head rcu; | |
96 | } it; | |
97 | }; | |
98 | ||
99 | struct k_clock { | |
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); | |
116 | }; | |
117 | ||
118 | extern struct k_clock clock_posix_cpu; | |
119 | extern struct k_clock clock_posix_dynamic; | |
120 | ||
121 | void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock); | |
122 | ||
123 | /* function to call to trigger timer event */ | |
124 | int posix_timer_event(struct k_itimer *timr, int si_private); | |
125 | ||
126 | void posix_cpu_timer_schedule(struct k_itimer *timer); | |
127 | ||
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); | |
131 | ||
132 | bool posix_cpu_timers_can_stop_tick(struct task_struct *tsk); | |
133 | ||
134 | void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx, | |
135 | cputime_t *newval, cputime_t *oldval); | |
136 | ||
137 | long clock_nanosleep_restart(struct restart_block *restart_block); | |
138 | ||
139 | void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new); | |
140 | ||
141 | #endif |