Periodic calls to csoundYield that does nothing will not be prohibitive if
only done once per ksmps. This can be accomplished by putting such a
csoundYield call in the main performance loop, and removing all other POLL
calls.

============================================
Michael Gogins
gogins at pipeline period com
Irreducible Productions
CsoundVST, an extended version of Csound for programming music and sound
Available at http://sourceforge.net/projects/csound/
============================================


----- Original Message ----- 
From: "John D. Ramsdell" 
To: "Csound Developers Discussion List" 
Sent: Sunday, December 14, 2003 8:20 AM
Subject: [CSOUND-DEV:3752] Re: POLLing in Csound5


> John ffitch  writes:
>
> > Does that not suggest that the POLL_EVENTS call should be textually
> > CsoundYeild (or whatever it is called)?  The other question that arises
is
> > the granularity of the yeilding.  Should opcodes call it, or only the
> > engine?
>
> I'm suggesting that POLL_EVENTS must be defined to be csoundYield
> whenever one is producing a library that implements the Csound API.
> When building the sources for some other purpose, one might want to
> define POLL_EVENTS() to be (1).  I'm not sure how useful this
> flexibility is, unless periodic calls to a csoundYield that does nothing
> proves expensive.
>
> For wxCsound, it needs to poll just often enough so that when a user
> requests an abort of a rendering, the abort happens within a user's
> view of a reasonable delay.  For this purpose, the granularity of the
> calls to csoundYield can be quite coarse, I would expect.  Other
> applications may have different needs.
>
> John
>

"Michael Gogins"  writes:

> Periodic calls to csoundYield that does nothing will not be
> prohibitive if only done once per ksmps. This can be accomplished by
> putting such a csoundYield call in the main performance loop, and
> removing all other POLL calls.

Agreed.  I'm pretty sure this reduced number of calls to csoundYield
will still be able to allow GUIs to provide timely abort services.

John