[Jackaudio] Processing callback thread safety guarantees

[Danny Wensley]

Hi all,

I'm in the process of building a small application that utilises Jack in
order to interface with audio hardware. Specifically, although this detail
is only partially relevant, I'm writing it in Rust (using some community
FFI bindings).

I was wondering what the thread safety guarantees of calling the processing
callback are. Specifically, I was wondering if it can be guaranteed that
the callback will only be called on a single thread at any given time?

This is primarily because it determines whether or not it is required for
the callback to be marked as "Sync" in Rust - which would indicate that the
callback's data must be thread safe, a restriction I'd prefer to avoid.

Thanks in advance.
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