From: Paulo Marques <pmarques@grupopie.com>
To: k8 s <uint32@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Doubt Regarding Multithreading and Device Driver
Date: Wed, 27 Apr 2005 16:41:57 +0100 [thread overview]
Message-ID: <426FB2C5.9030906@grupopie.com> (raw)
In-Reply-To: <699a19ea05042708305fb7194b@mail.gmail.com>
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)
next prev parent reply other threads:[~2005-04-27 15:42 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-27 15:05 Doubt Regarding Multithreading and Device Driver k8 s
2005-04-27 15:10 ` Max Kellermann
2005-04-27 15:30 ` k8 s
2005-04-27 15:41 ` Paulo Marques [this message]
2005-04-27 15:46 ` Al Viro
2005-04-27 15:34 ` Richard B. Johnson
2005-04-27 15:34 ` Jonathan Corbet
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