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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _linux_POSIX_TIMERS_H |
3 | #define _linux_POSIX_TIMERS_H | |
4 | ||
5 | #include <linux/spinlock.h> | |
6 | #include <linux/list.h> | |
7 | #include <linux/sched.h> | |
f1f1d5eb | 8 | #include <linux/timex.h> |
9a7adcf5 | 9 | #include <linux/alarmtimer.h> |
1da177e4 | 10 | |
31ea70e0 | 11 | struct siginfo; |
55ccb616 | 12 | |
1da177e4 LT |
13 | struct cpu_timer_list { |
14 | struct list_head entry; | |
ebd7e7fc | 15 | u64 expires, incr; |
1da177e4 LT |
16 | struct task_struct *task; |
17 | int firing; | |
18 | }; | |
19 | ||
81e294cb RC |
20 | /* |
21 | * Bit fields within a clockid: | |
22 | * | |
23 | * The most significant 29 bits hold either a pid or a file descriptor. | |
24 | * | |
25 | * Bit 2 indicates whether a cpu clock refers to a thread or a process. | |
26 | * | |
27 | * Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3. | |
28 | * | |
29 | * A clockid is invalid if bits 2, 1, and 0 are all set. | |
30 | */ | |
1da177e4 LT |
31 | #define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3)) |
32 | #define CPUCLOCK_PERTHREAD(clock) \ | |
33 | (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0) | |
0606f422 | 34 | |
1da177e4 LT |
35 | #define CPUCLOCK_PERTHREAD_MASK 4 |
36 | #define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK) | |
37 | #define CPUCLOCK_CLOCK_MASK 3 | |
38 | #define CPUCLOCK_PROF 0 | |
39 | #define CPUCLOCK_VIRT 1 | |
40 | #define CPUCLOCK_SCHED 2 | |
41 | #define CPUCLOCK_MAX 3 | |
81e294cb RC |
42 | #define CLOCKFD CPUCLOCK_MAX |
43 | #define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK) | |
1da177e4 LT |
44 | |
45 | #define MAKE_PROCESS_CPUCLOCK(pid, clock) \ | |
46 | ((~(clockid_t) (pid) << 3) | (clockid_t) (clock)) | |
47 | #define MAKE_THREAD_CPUCLOCK(tid, clock) \ | |
48 | MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK) | |
49 | ||
0606f422 RC |
50 | #define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD) |
51 | #define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3)) | |
52 | ||
1da177e4 | 53 | #define REQUEUE_PENDING 1 |
03676b41 TG |
54 | |
55 | /** | |
56 | * struct k_itimer - POSIX.1b interval timer structure. | |
57 | * @list: List head for binding the timer to signals->posix_timers | |
58 | * @t_hash: Entry in the posix timer hash table | |
59 | * @it_lock: Lock protecting the timer | |
d97bb75d | 60 | * @kclock: Pointer to the k_clock struct handling this timer |
03676b41 TG |
61 | * @it_clock: The posix timer clock id |
62 | * @it_id: The posix timer id for identifying the timer | |
21e55c1f | 63 | * @it_active: Marker that timer is active |
03676b41 TG |
64 | * @it_overrun: The overrun counter for pending signals |
65 | * @it_overrun_last: The overrun at the time of the last delivered signal | |
66 | * @it_requeue_pending: Indicator that timer waits for being requeued on | |
67 | * signal delivery | |
68 | * @it_sigev_notify: The notify word of sigevent struct for signal delivery | |
80105cd0 | 69 | * @it_interval: The interval for periodic timers |
03676b41 TG |
70 | * @it_signal: Pointer to the creators signal struct |
71 | * @it_pid: The pid of the process/task targeted by the signal | |
72 | * @it_process: The task to wakeup on clock_nanosleep (CPU timers) | |
73 | * @sigq: Pointer to preallocated sigqueue | |
74 | * @it: Union representing the various posix timer type | |
75 | * internals. Also used for rcu freeing the timer. | |
76 | */ | |
77 | struct k_itimer { | |
78 | struct list_head list; | |
79 | struct hlist_node t_hash; | |
80 | spinlock_t it_lock; | |
d97bb75d | 81 | const struct k_clock *kclock; |
03676b41 TG |
82 | clockid_t it_clock; |
83 | timer_t it_id; | |
21e55c1f | 84 | int it_active; |
4729028b TG |
85 | s64 it_overrun; |
86 | s64 it_overrun_last; | |
03676b41 TG |
87 | int it_requeue_pending; |
88 | int it_sigev_notify; | |
80105cd0 | 89 | ktime_t it_interval; |
03676b41 | 90 | struct signal_struct *it_signal; |
27af4245 | 91 | union { |
03676b41 TG |
92 | struct pid *it_pid; |
93 | struct task_struct *it_process; | |
27af4245 | 94 | }; |
03676b41 | 95 | struct sigqueue *sigq; |
1da177e4 LT |
96 | union { |
97 | struct { | |
03676b41 | 98 | struct hrtimer timer; |
1da177e4 | 99 | } real; |
03676b41 | 100 | struct cpu_timer_list cpu; |
9e264762 | 101 | struct { |
03676b41 | 102 | struct alarm alarmtimer; |
9e264762 | 103 | } alarm; |
03676b41 | 104 | struct rcu_head rcu; |
1da177e4 LT |
105 | } it; |
106 | }; | |
107 | ||
2a698971 TG |
108 | void run_posix_cpu_timers(struct task_struct *task); |
109 | void posix_cpu_timers_exit(struct task_struct *task); | |
110 | void posix_cpu_timers_exit_group(struct task_struct *task); | |
2a698971 | 111 | void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx, |
858cf3a8 | 112 | u64 *newval, u64 *oldval); |
1da177e4 | 113 | |
5ab46b34 | 114 | void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new); |
f06febc9 | 115 | |
96fe3b07 | 116 | void posixtimer_rearm(struct siginfo *info); |
1da177e4 | 117 | #endif |