> posix.1b signals are standard; SIGIO is standard; combining the two
> is an obvious way to implement completion queues with a minimum of
> non-standardness. It's not _completely_ standard, but I don't see
> any fully standard and scalable interface alternatives right now.
It's not a non-standard solution. POSIX.1b explicitly leaves it
undefined whether the "normal" signals can be used with the RT signal
functions or not. So a solution based on SIGIO+RT sigs is allowed by
the standard, it might just be not portable.
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