I wrote:
> ... Can we get rid of the unsafe
> access easily?
Oh, shoulda read your second patch first. Looking at that,
I fear it might not be quite that simple, because the
comment on CheckAndSetLockHeld says very clearly
* It is callers responsibility that this function is called after
* acquiring/releasing the relation extension/page lock.
so your proposed patch violates that specification.
I'm inclined to think that this API spec is very poorly thought out
and should be changed --- why is it that the flags should change
*after* the lock change in both directions? But we'd have to take
a look at the usage of these flags to understand what's going on
exactly.
regards, tom lane
