Re: src/backend/storage/lmgr/lock.c ----> LockAcquire()

"S -" <nat_lazy@hotmail.com> writes:
> -- Within a SINGLE call of LockAcquire, is it possible for GrantLock() to be 
> called multiple times?

Hmm.  In the normal course of events, a LockAcquire would only try to
grant the target lock to itself; it couldn't grant anything to anyone
else as a byproduct.  But I think there might be corner cases involving
deadlock detection.  Once a deadlock is detected, the resulting
transaction abort leads to lock releases which lead to lock grants
occurring --- so how narrowly are you defining "a single call of
LockAcquire"?

In any case a single call of LockRelease can certainly result in
multiple GrantLocks, so I'm not sure what sort of optimization you might
have in mind that would be feasible.
        regards, tom lane