how can we wake up some process which is scheduled?

[Alexandru Juncu]

On Tue, Dec 13, 2011 at 10:44 AM, loody <miloody at gmail.com> wrote:
> hi all:
> There is a kernel API, "schedule_timeout_interruptible".
> since it has the name interruptible, who and how can we interrupt this task?
> suppose A use schedule_timeout_interruptible for 20s period and B
> found something and he want to wake up A within this 20s period.

I think it's related to hardware interrupts, not other tasks. So a
process waiting for a timer can be interrupted by a signal (there's a
switch between process context and interrupt context).

Take a look at schedule_timeout help page [0]. Notice the
TASK_UNINTERRUPTIBLE and TASK_INTERRUPTIBLE sections.

[0] http://kernel.org/doc/htmldocs/device-drivers/API-schedule-timeout.html

-- 
Alexandru Juncu

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