阻塞在schedule_timeout()了，怎么返回?

testh

一路追踪发现进入了schedule_timetout()就再也没有出来。除了干等着timeout外，还有其他方法让它退出shedule_timeout()吗?

testh

https://www.kernel.org/doc/htmld ... hedule-timeout.html

Name

schedule_timeout — sleep until timeout
Synopsis
signed long __sched schedule_timeout (        signed long timeout);

Arguments

timeout

    timeout value in jiffies

Description

Make the current task sleep until timeout jiffies have elapsed. The routine will return immediately unless the current task state has been set (see set_current_state).

You can set the task state as follows -

TASK_UNINTERRUPTIBLE - at least timeout jiffies are guaranteed to pass before the routine returns. The routine will return 0

TASK_INTERRUPTIBLE - the routine may return early if a signal is delivered to the current task. In this case the remaining time in jiffies will be returned, or 0 if the timer expired in time

The current task state is guaranteed to be TASK_RUNNING when this routine returns.

Specifying a timeout value of MAX_SCHEDULE_TIMEOUT will schedule the CPU away without a bound on the timeout. In this case the return value will be MAX_SCHEDULE_TIMEOUT.

In all cases the return value is guaranteed to be non-negative.


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