blob: ee7e987ea1b4354ef93a149c997caf75b6269c1b [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _linux_POSIX_TIMERS_H
#define _linux_POSIX_TIMERS_H
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/timex.h>
#include <linux/alarmtimer.h>
struct siginfo;
struct cpu_timer_list {
struct list_head entry;
u64 expires, incr;
struct task_struct *task;
int firing;
* Bit fields within a clockid:
* The most significant 29 bits hold either a pid or a file descriptor.
* Bit 2 indicates whether a cpu clock refers to a thread or a process.
* Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3.
* A clockid is invalid if bits 2, 1, and 0 are all set.
#define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3))
#define CPUCLOCK_PERTHREAD(clock) \
(((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
#define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
#define CPUCLOCK_MAX 3
static inline clockid_t make_process_cpuclock(const unsigned int pid,
const clockid_t clock)
return ((~pid) << 3) | clock;
static inline clockid_t make_thread_cpuclock(const unsigned int tid,
const clockid_t clock)
return make_process_cpuclock(tid, clock | CPUCLOCK_PERTHREAD_MASK);
static inline clockid_t fd_to_clockid(const int fd)
return make_process_cpuclock((unsigned int) fd, CLOCKFD);
static inline int clockid_to_fd(const clockid_t clk)
return ~(clk >> 3);
* struct k_itimer - POSIX.1b interval timer structure.
* @list: List head for binding the timer to signals->posix_timers
* @t_hash: Entry in the posix timer hash table
* @it_lock: Lock protecting the timer
* @kclock: Pointer to the k_clock struct handling this timer
* @it_clock: The posix timer clock id
* @it_id: The posix timer id for identifying the timer
* @it_active: Marker that timer is active
* @it_overrun: The overrun counter for pending signals
* @it_overrun_last: The overrun at the time of the last delivered signal
* @it_requeue_pending: Indicator that timer waits for being requeued on
* signal delivery
* @it_sigev_notify: The notify word of sigevent struct for signal delivery
* @it_interval: The interval for periodic timers
* @it_signal: Pointer to the creators signal struct
* @it_pid: The pid of the process/task targeted by the signal
* @it_process: The task to wakeup on clock_nanosleep (CPU timers)
* @sigq: Pointer to preallocated sigqueue
* @it: Union representing the various posix timer type
* internals. Also used for rcu freeing the timer.
struct k_itimer {
struct list_head list;
struct hlist_node t_hash;
spinlock_t it_lock;
const struct k_clock *kclock;
clockid_t it_clock;
timer_t it_id;
int it_active;
s64 it_overrun;
s64 it_overrun_last;
int it_requeue_pending;
int it_sigev_notify;
ktime_t it_interval;
struct signal_struct *it_signal;
union {
struct pid *it_pid;
struct task_struct *it_process;
struct sigqueue *sigq;
union {
struct {
struct hrtimer timer;
} real;
struct cpu_timer_list cpu;
struct {
struct alarm alarmtimer;
} alarm;
struct rcu_head rcu;
} it;
void run_posix_cpu_timers(struct task_struct *task);
void posix_cpu_timers_exit(struct task_struct *task);
void posix_cpu_timers_exit_group(struct task_struct *task);
void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
u64 *newval, u64 *oldval);
void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
void posixtimer_rearm(struct siginfo *info);