Subject: Re: waiting on a condition
From: Christophe Saout <christophe@saout.de>
To: Martijn Sipkema <martijn@entmoot.nl>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <02bb01c4b138$8a786f10$161b14ac@boromir>
References: <02bb01c4b138$8a786f10$161b14ac@boromir>
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Date: Wed, 13 Oct 2004 17:34:39 +0200
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Am Mittwoch, den 13.10.2004, 16:23 +0100 schrieb Martijn Sipkema:

> I'd like to do something similar as can be done using a POSIX condition
> variable in the kernel, i.e. wait for some condition to become true. The
> pthread_cond_wait() function allows atomically unlocking a mutex and
> waiting on a condition. I think I should do something like:
> (the condition is updated from an interrupt handler)

You can take a look at reiser4, it has such an implementation. It's
called kcond (fs/reiser4/kcond.c). It's using semaphores, waitqueues and
a spinlock to emulate POSIX conditions.


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