Re: External PCM plugin SDK

[Takashi Iwai <tiwai@suse.de>]

At Fri, 11 Feb 2005 13:15:19 +0100,
Marcel Holtmann wrote:
> 
> Hi Takashi,
> 
> > > > ... and doesn't work as it is, unfortunately :-<
> > > > 
> > > > dlcose() is called after snd_pcm_close().
> > > > We may need to build object caches in alsa-lib.
> > > > This will improve the perfomance eventually, too.
> > > 
> > > questions is what will break if you change it. The only official plugin
> > > is the Jack plugin, right? So be bad and change this stuff and then fix
> > > the plugins.
> > 
> > The compatibility will be kept, I think.  Only the plugins with a
> > keep-alive flag are excluded from dlclose, and the objects are reused
> > at the next open.
> 
> but I think we still should implement something like init() and exit()
> of the objects. Otherwise it would not be possible to handle this in a
> correct way and we will get memory leaks and unclosed descriptors.

We can add the clean up of cached plugin objects (i.e. calling
dlclose) in the existing snd_config_update_free_global().  This
function is supposed to be used for clean up of config tree cache.

Each plugin with the keep-alive flag can have functions with
__attribute__((constructor)) and __attribute__((destructor)) for the
purpose above.


Takashi


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