posix_timer_fn

函数名称：This function gets called when a POSIX.1b interval timer expires. It* is used as a callback from the kernel internal timer. The* run_timer_list code ALWAYS calls with interrupts on.* This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers.

函数原型：static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)

返回类型：enum hrtimer_restart

参数：

类型	参数	名称
struct hrtimer *	timer

344

si_private等于0

345

ret等于Timer is not restarted

347

timr等于container_of - cast a member of a structure out to the containing structure*@ptr: the pointer to the member.*@type: the type of the container struct this is embedded in.*@member: the name of the member within the struct.(timer, structk_itimer, timer)

348

spin_lock_irqsave( & it_lock, flags)

350

it_active等于0

351

如果it_interval不等于0则si_private等于it_requeue_pending先自加

354

如果posix_timer_event(timr, si_private)则

360

如果it_interval不等于0则

361

now等于hrtimer_cb_get_time(timer)

393

it_overrun加等于hrtimer_forward - forward the timer expiry*@timer: hrtimer to forward*@now: forward past this time*@interval: the interval to forward* Forward the timer expiry so it will expire in the future.* Returns the number of overruns.

395

ret等于Timer must be restarted

396

it_requeue_pending先自加

397

it_active等于1

401

unlock_timer(timr, flags)

402

返回:ret

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