Re: [Jack-Devel] jconvolver and OSX

On Mon, Feb 28, 2011 at 6:58 AM, Fons Adriaensen <[hidden]> wrote:

> Does that mean that if you create a number of them sequentially
> and unlink each of them before creating a new one, you can use
> the same name for all ?

i haven't tried that. from the semantics of unlink(2), i'd suspect
that it would work (since it works that way for files).

>> the *real* issue on OS X is that apple implemented sem_init() with a
>> stub function. it does not return an error, but does nothing at all.
>> absolutely appalling decision on their part.
>
> It doesn't even reset the value ? Zita-convolver relies on that...

that's why the constructor in the code torben pasted has two different
pathways, one for OS X (involving sem_open() and then sem_unlink())
and one for non-OS X involving sem_init(). there are no other changes
required for handling the semaphores (though the sem_close() during
descruction in the OS X case is a good idea for most use cases).

we use these semaphores in ardour3 for multi-threaded graph
synchronization. to be fair, however, we have not really tested them
much on OS X at this point (though we have verified that they work as
expected).

--p

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