Hackers,
In the hope of this not being derailed by larger/more unpopular pieces of work, I'm attaching a tiny patch which I don't believe will have any negative impact - but will remove one blocker for $subject (sigprocmask usage is "unspecified" in multithreaded code [1]).
The patch replaces sigprocmask with pthread_sigmask. They have identical APIs ("[pthread_sigmask] shall be equivalent to sigprocmask(), without the restriction that the call be made in a single-threaded process"[1])
The rationale here is that as far as I can tell this is the *only* blocker to using multithreaded code in a BGWorker which can't be avoided by adhering to strict code rules (eg: no PG calls from non-main threads, no interaction with signals from non-main threads).
Before this went in the rules would need to be agreed upon and documented - but hopefully it's at least a way forward / a way to progress this discussion.
Cheers,
James
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