What is the context for rados callbacks?

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I'm considering using rados callbacks in my application, but the
documentation doesn't include enough information about their context.
If I schedule a callback with rados_aio_create_completion(), from what
context will my callback be called?  Will it be called from a signal
handler?  Will it be called from a separate thread?  If I schedule
multiple simultaneous callbacks, will they each be called from their
own thread or from a single shared callback thread?  Perhaps most
importantly, can I call other RADOS API functions from my callback?

Thanks for any help you can give,
-Alan
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