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 136