[linux-audio-dev] jack_callback <-> rest of the world

[Alfons Adriaensen]

On Wed, Nov 02, 2005 at 11:56:59AM +0100, St?phane Letz wrote:

> >I must be missing something essential here. Access to named things
> >that have to be opened is normally by a file descriptor, and file
> >descriptors are bound a process. How then can you give *all* clients
> >access to the named pipe or sema created for a new client ?
> 
> The synchronization primitive is actually created by the server when  
> a new client register. Then a client identifier (built using the  
> actual client name) is transfered to all running clients that will  
> define/access the synchronization primitive in their own process.

But in order to define/access it in their own process, they have to open()
it, i.e. perfrom a call to the filesystem, or am I wrong here ? 
This means that changing the graph order can never be a RT operation,
unless clients get a second, non-RT thread to perform this call from.


(or do it in their own non-RT user code, but that would be horrible).

-- 
FA