函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\locking\semaphore.c Create Date:2022-07-27 10:48:07
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：down_timeout - acquire the semaphore within a specified time*@sem: the semaphore to be acquired*@timeout: how long to wait before failing* Attempts to acquire the semaphore. If no more tasks are allowed to

函数原型：int down_timeout(struct semaphore *sem, long timeout)

返回类型：int

参数：

类型参数名称
struct semaphore *sem
longtimeout
158  result等于0
160  raw_spin_lock_irqsave( & lock, flags)
161  如果此条件成立可能性大(为编译器优化)(count > 0)则count自减
163  否则result等于__down_timeout(sem, timeout)
165  raw_spin_unlock_irqrestore( & lock, flags)
167  返回:result