linux-kernel - Killing a User thread from another User Thread

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Message-ID: <03f701c78bad$5c589220$142ec70a@dlh.st.com>
Date:	Tue, 1 May 2007 10:28:29 +0530
From:	Bhuvan Kumar MITTAL <bhuvan.mittal@...com>
To:	<linux-kernel@...r.kernel.org>
Cc:	"'Bhuvan Kumar MITTAL'" <bhuvan.mittal@...com>
Subject: Killing a User thread from another User Thread 

Hi.
I am working on an audio device driver development on Linux (sh4 architecture). I have a userthread which makes ioctl calls to the kernel and once it reaches inside the kernel it waits on a semaphore. It then does some work inside the kernel and continuously keeps looping between the kernel and user space in an endless while loop. 

I want to kill that thread from another user thread while the former is waiting on a semaphore in kernel (which it will never get) coz I want a clean exit of my driver. Please suggest me a way. I did try the use of pthread_cancel, but that is possible only if the target thread is executing in user space and making use of a pthread_testcancel call (with cancelability enabled ofcourse). 

Kindly suggest something.

Regards,

Bhuvan

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