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TOMOYO Linux Cross Reference
Linux/include/linux/posix-timers.h

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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 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 

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