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 11static inline unsigned long long cputime_to_expires(cputime_t expires) 12{ 13 return (__force unsigned long long)expires; 14} 15 16static inline cputime_t expires_to_cputime(unsigned long long expires) 17{ 18 return (__force cputime_t)expires; 19} 20 21struct 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. */ 62struct 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 99struct 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 118extern struct k_clock clock_posix_cpu; 119extern struct k_clock clock_posix_dynamic; 120 121void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock); 122 123/* function to call to trigger timer event */ 124int posix_timer_event(struct k_itimer *timr, int si_private); 125 126void posix_cpu_timer_schedule(struct k_itimer *timer); 127 128void run_posix_cpu_timers(struct task_struct *task); 129void posix_cpu_timers_exit(struct task_struct *task); 130void posix_cpu_timers_exit_group(struct task_struct *task); 131 132bool posix_cpu_timers_can_stop_tick(struct task_struct *tsk); 133 134void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx, 135 cputime_t *newval, cputime_t *oldval); 136 137long clock_nanosleep_restart(struct restart_block *restart_block); 138 139void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new); 140 141#endif 142