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getpid() isn't cached by glibc nowadays and system calls are
more expensive due to CPU vulnerability mitigations. To
ensure we switch to the new semantics properly, introduce
a new `on_destroy' function to simplify callers.
Furthermore, most OnDestroy correctness is often tied to the
process which creates it, so make the new API default to
guarded against running in subprocesses.
For cases which require running in all children, a new
PublicInbox::OnDestroy::all call is provided.
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We probably use this idiom elsewhere, but having this method
around to make future use cases more readable is probably prudent.
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Since we'll be forking for Xapian indexing and maybe
other places, having a simple guard in place to ensure
OnDestroy doesn't unexpectedly unlink files or similar
is a safer option.
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This is a localized version of the process-wide END{}, but runs
at the end of variable scope. A subroutine ref and arguments
may be passed, which allows us to avoid anonymous subs and
problems they cause.
It's similar to `defer' or `ensure' in other languages; Perl can
rely on deterministic destructors due to refcounting.
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