Message-ID: <426FB2C5.9030906@grupopie.com>
Date: Wed, 27 Apr 2005 16:41:57 +0100
From: Paulo Marques <pmarques@grupopie.com>
Organization: Grupo PIE
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To: k8 s <uint32@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Doubt Regarding Multithreading and Device Driver
References: <699a19ea050427080545fb1676@mail.gmail.com>	 <20050427151040.GA5717@roonstrasse.net> <699a19ea05042708305fb7194b@mail.gmail.com>
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k8 s wrote:
> But i am sharing something in file->private_data which is a private
> variable to the process(that is passed to the device driver
> functions). Isn't it?

How do you make sure that there is only one process accessing the file?

If you open a file and then fork another process, both have access to 
the file using the same file descriptor.

You might want to do precisely this for a number of reasons, like having 
one process that send commands to a device while the other receives 
status information...

-- 
Paulo Marques - www.grupopie.com

All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke (1729 - 1797)
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