linux-kernel - Re: stopping a process during a timer interrupt

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Message-ID: <20061017225603.GA15846@c3po.0xdef.net>
Date:	Wed, 18 Oct 2006 00:56:03 +0200
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Kay Tiong Khoo <kaytiong@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: stopping a process during a timer interrupt

* Kay Tiong Khoo | 2006-10-17 18:18:25 [+0800]:

>On a timer interrupt, I tried to stop the current process by changing
>it's run state to TASK_STOPPED via set_current_state(TASK_STOPPED).
>However, this results in a system hang.
>
>I can't find a way to stop the current process during an interrupt
>context. Does such code exist in the kernel? If not, how does one go
>about implementing it from within a kernel module.

Take a look at some driver implementations!
There you will find some ways how to put a process into a sleep state.

Grep for "*->state*TASK_UNINTERRUPTIBLE" and take also a look at the
interaction with schedule() and spinlocks.

>Thanks.
>Kay Tiong

Best regards

-- 
Hagen Pfeifer
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