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acad909321
elog()/ereport() process interrupts, iff the log message is < ERROR and the
log message will be emitted. aio's debug messages are emitted via ereport(),
but in some places the code is not ready for interrupts to be processed.
Fix the issue using a few different methods:
1) handle interrupts arriving concurrently - in some places it's easy to
detect that by fetching the handle's generation a bit earlier
2) Check if interrupts made the work needing to be done obsolete
3) Disallow interrupts, as there's no sane way to make interrupt processing
safe
To prevent some similar issues from being re-introduced, assert that
interrupts are held in pgaio_io_update_state().
This commit also fixes the contents of a debug message I added in
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