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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