I've considered making all my DeviceRequest() calls asynchronous, but
there
are a *lot* of them (potentially over 20, if the device starts out in a
suspended state...) which need to be made to setup and enable this
device,
and it's making for very messy and hard to maintain code, something I
prefer
to avoid whenever possible. I'd like to find some mechanism which
would
allow me to defer those device requests and make them all
synchronously at
some later point.
As far as I can tell from my research, if I use runAction to defer the
sequence, then it's still going to block on my DeviceRequest() calls,
so
that isn't a solution. Anyone know of a way to resolve this?
The solution is to start a new kernel thread to make the Syncronous
calls. Look in the header file thread_call.h and in the IOUSBFamily
sources in Darwin for examples on how to do this. We do it all the time
in the IOUSBFamily.
Rhoads Hollowell
USB Software Team
Apple Computer, Inc.
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