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Subj : Re: shared libraries reentrant?
To   : comp.programming.threads
From : Ole Reinartz
Date : Tue Sep 20 2005 11:42 am



CFeil wrote:

>Hi,
>
>how can I make a sharead library reentrant?
>
>I hvae some 3rd party device driver SW which I will make a library out of.
>This library is planned to be used by to different threads. Is it possible
>to have a shared library with ONE mutex which can be used by both threads,
>Or is there any other way?
>  
>
Easy: create a mutex, lock it whenever you enter the lib, unlock it 
whenever you're done with it. You can perfectly well place the mutex in 
your shared lib, AFAIK it will be then created per process that uses the 
lib.
Thinking about it, is there some resource local to the shared lib (once 
per lib, not per process) you want to guard against multiple concurrent 
access? I'm currently not aware of a simple mechanism to achieve that. 
You may want to place your device driver in a process and then access 
the lib only through that process using some ipc- mechanism.

Hope that helps
Ole

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