On 16.05.2012 15:42, Sandro Santilli wrote:
But CHECK_FOR_INTERRUPTS doesn't return, right ? Is there another macro for just checking w/out yet acting upon it ?
Hmm, no. CHECK_FOR_INTERRUPTS() checks the InterruptPending variable, but on Windows it also checks for UNBLOCKED_SIGNAL_QUEUE(). And even if InterruptPending is set, it's not totally certain that CHECK_FOR_INTERRUPTS() won't return. I think InterruptPending can be set spuriously (even if that's not possible today, I wouldn't rely on it), and if you're in a HOLD/RESUME_INTERRUPTS block, CHECK_FOR_INTERRUPTS() will do nothing even if InterruptPending is true.
The only sane way to make 3rd party code interruptible is to add CHECK_FOR_INTERRUPTS() to it, in safe places.
-- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
