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List:       fuse-devel
Subject:    Re: [fuse-devel] threading
From:       Bernd Schubert <bernd-schubert () gmx ! de>
Date:       2007-02-02 3:04:10
Message-ID: epu9na$fer$1 () sea ! gmane ! org
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Bernd Schubert wrote:

> Regarding to global variables I have the following problem:
> 
> Lets say we have a linked list as cache and the nodes of the linked list
> can "rotate", so the last node becomes first, second last node becomes
> last, etc.
> Though the rotation operation is rather fast, there might be a race
> condition during the rotation. Of course, I could try to do locking, but
> even locking requires some time and another, though less probable, race
> could happen. I have absolutely no experience with this kind of threading
> and I always wonder how it is done in the kernel.
> 

Answering myself to that problem, pthread locking using 

pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_lock (&mutex1);
pthread_mutex_unlock (&mutex1);

should do the trick (lock and unlock of course at the right places).



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