[nas] Of non-callback NAS, OpenAL backends, and 'fatal IO error 0'.

[Yotam Gingold]

I've been working at writing an OpenAL backend using nas.
I've tried to use code from the audioss library, nas_open, nas_write, and
nas_close, which looked very well suited to the task.
I also tried to integrate the playRaw.c code into the the backend.
Both times I get stuck on the same error message:

AuIO:  fatal IO error 0 (Error 0) on audio server "local/:0"
      after 3 requests (0 known processed) with 0 events remaining.

Sometimes (rarely) the 3 requests are 10.
Once in a blue moon this error message doesn't show up-- but no sound is
played.
It seems to happen during an AuNextEvent in my playRaw-derived code.

Any ideas?

Some sort of Flow where I can WriteElement every time I get data and not
worry about much else would be better suited to my task, I think.
I wouldn't have to worry about callbacks and an EventLoop for my
blitbuffer function which is already a callback itself.
The audioss calls nas_open/close/write seemed like they would be perfect
for this... but that same error above prevented anything interesting from
happening.

Any ideas?

Thanks,
Yotam