[gmpi] Re: 3.11 partial wrap: Inter-parameter linkages
- From: Tim Hockin <thockin@xxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Tue, 20 Apr 2004 14:30:29 -0700
On Tue, Apr 20, 2004 at 04:14:24PM -0500, Jack O'Quin wrote:
> > > I was worried about possible hidden linkages between plugins or
> > > between multiple instances of the same plugin. Perhaps this should be
> > > explicitly disallowed. If not, then any changes within a single
> > > timeslice could easily become non-deterministic, especially if the
> > > graph aggressively takes advantage of multiprocessor hardware.
> >
> > Inter-plugin and inter-instance linkages MUST be reflected in the graph to
> > function properly. I think that's obvious, but do we want to actually state
> > it?
>
> Now I'm not sure what you're saying.
Any linkage between two nodes of the graph needs to be either audio IO or
control IO. If you use things like class-static variables that are shared
among instances, then your plugin MIGHT break.
The finest unit of granularity that GMPI supports is a plugin instance.
All events for a plugin instance are delivered BEFORE that instance is
called for process(). No event will be delivered to a plugin for a
timeslice after that plugin has begun processing that slice.
Think of it as a directed dependency graph. Anything that sends an event
to FOO must be run and completed before FOO is run.
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