| 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 | union cpu_time_count { |
| 11 | cputime_t cpu; |
| 12 | unsigned long long sched; |
| 13 | }; |
| 14 | |
| 15 | struct cpu_timer_list { |
| 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 */ |
| 58 | struct hlist_node t_hash; |
| 59 | spinlock_t it_lock; |
| 60 | clockid_t it_clock; /* which timer type */ |
| 61 | timer_t it_id; /* timer id */ |
| 62 | int it_overrun; /* overrun on pending signal */ |
| 63 | int it_overrun_last; /* overrun on last delivered signal */ |
| 64 | int it_requeue_pending; /* waiting to requeue this timer */ |
| 65 | #define REQUEUE_PENDING 1 |
| 66 | int it_sigev_notify; /* notify word of sigevent struct */ |
| 67 | struct signal_struct *it_signal; |
| 68 | union { |
| 69 | struct pid *it_pid; /* pid of process to send signal to */ |
| 70 | struct task_struct *it_process; /* for clock_nanosleep */ |
| 71 | }; |
| 72 | struct sigqueue *sigq; /* signal queue entry. */ |
| 73 | union { |
| 74 | struct { |
| 75 | struct hrtimer timer; |
| 76 | ktime_t interval; |
| 77 | } real; |
| 78 | struct cpu_timer_list cpu; |
| 79 | struct { |
| 80 | unsigned int clock; |
| 81 | unsigned int node; |
| 82 | unsigned long incr; |
| 83 | unsigned long expires; |
| 84 | } mmtimer; |
| 85 | struct { |
| 86 | struct alarm alarmtimer; |
| 87 | ktime_t interval; |
| 88 | } alarm; |
| 89 | struct rcu_head rcu; |
| 90 | } it; |
| 91 | }; |
| 92 | |
| 93 | struct k_clock { |
| 94 | int (*clock_getres) (const clockid_t which_clock, struct timespec *tp); |
| 95 | int (*clock_set) (const clockid_t which_clock, |
| 96 | const struct timespec *tp); |
| 97 | int (*clock_get) (const clockid_t which_clock, struct timespec * tp); |
| 98 | int (*clock_adj) (const clockid_t which_clock, struct timex *tx); |
| 99 | int (*timer_create) (struct k_itimer *timer); |
| 100 | int (*nsleep) (const clockid_t which_clock, int flags, |
| 101 | struct timespec *, struct timespec __user *); |
| 102 | long (*nsleep_restart) (struct restart_block *restart_block); |
| 103 | int (*timer_set) (struct k_itimer * timr, int flags, |
| 104 | struct itimerspec * new_setting, |
| 105 | struct itimerspec * old_setting); |
| 106 | int (*timer_del) (struct k_itimer * timr); |
| 107 | #define TIMER_RETRY 1 |
| 108 | void (*timer_get) (struct k_itimer * timr, |
| 109 | struct itimerspec * cur_setting); |
| 110 | }; |
| 111 | |
| 112 | extern struct k_clock clock_posix_cpu; |
| 113 | extern struct k_clock clock_posix_dynamic; |
| 114 | |
| 115 | void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock); |
| 116 | |
| 117 | /* function to call to trigger timer event */ |
| 118 | int posix_timer_event(struct k_itimer *timr, int si_private); |
| 119 | |
| 120 | void posix_cpu_timer_schedule(struct k_itimer *timer); |
| 121 | |
| 122 | void run_posix_cpu_timers(struct task_struct *task); |
| 123 | void posix_cpu_timers_exit(struct task_struct *task); |
| 124 | void posix_cpu_timers_exit_group(struct task_struct *task); |
| 125 | |
| 126 | bool posix_cpu_timers_can_stop_tick(struct task_struct *tsk); |
| 127 | |
| 128 | void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx, |
| 129 | cputime_t *newval, cputime_t *oldval); |
| 130 | |
| 131 | long clock_nanosleep_restart(struct restart_block *restart_block); |
| 132 | |
| 133 | void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new); |
| 134 | |
| 135 | #endif |