[wdmaudiodev] Re: WavePCI issue with multiple processors
- From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 27 Mar 2007 11:58:58 +1000
Hi Eugene,
A probability of that a new mapping becomes available exactly within
this window, is almost zero.
You're right, of course. I was thinking I had to reacquire my spin lock
after the unsuccessful call to GetMapping, but looking at it now, that's not
necessary, and I can just call InterlockedDecrement on my InAcquisitionLoop
variable and exit.
And a well-optimized driver itself cannot guarantee that all Windows
audio subsystems will function quickly and reliably. Even DirectSound
with hardware buffers introduces a significant overhead and software
buffers and/or MME introduce much more overhead. So you can achieve a
reproducible high performance only if your well-optimized application
uses your well-optimized audio driver directly via its wave/topology
interfaces.
For this particular application, I'm using the Vista Core Audio API in
exclusive mode, and this was when some of the wrinkles in my WavePCI drivers
started showing up. I'm now using your suggestion with the interlocked
InAcquisitionLoop variable and so far it's all hanging in there!
Thanks for your help.
Jeff
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