函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\time\posix-cpu-timers.c Create Date:2022-07-27 11:47:47
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：posix_cpu_timer_get

函数原型：static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec64 *itp)

返回类型：void

参数：

类型参数名称
struct k_itimer *timer
struct itimerspec64 *itp
704  clkid等于CPUCLOCK_WHICH(it_clock)
705  ctmr等于cpu
706  expires等于cpu_timer_getexpires(ctmr)
707  p等于task
709  如果WARN_ON_ONCE(!p)则返回
715  it_interval等于Map the ktime_t to timespec conversion to ns_to_timespec function (it_interval)
717  如果非expires则返回
723  如果CPUCLOCK_PERTHREAD(it_clock)则
724  now等于Sample a per-thread clock for the given task. clkid is validated.
725  否则
734  sighand等于lock_task_sighand(p, & flags)
735  如果此条件成立可能性小(为编译器优化)(sighand == NULL)则
741  cpu_timer_setexpires(ctmr, 0)
742  返回
743  否则
744  now等于Sample a process (thread group) clock for the given task clkid. If the* group's cputime accounting is already enabled, read the atomic* store. Otherwise a full update is required. Task's sighand lock must be
745  unlock_task_sighand(p, & flags)
749  如果now小于expires则
750  it_value等于纳秒转换到64位timespec时间
751  否则
756  nanoseconds 等于1
757  seconds 等于0