Re: dsm_unpin_segment

On 8/9/16 6:14 PM, Thomas Munro wrote:
>> Could a couple of static variables be used to ensure multiple pin/unpin and
>> > attach/detach calls throw an assert() (or become a no-op if asserts are
>> > disabled)? It would be nice if we could protect users from this.
> The can't be static, they need to be in shared memory, because we also
> want to protect against two *different* backends pinning it.

Right, this would strictly protect from it happening within a single 
backend. Perhaps it's pointless for pin/unpin, but it seems like it 
would be a good thing to have for attach/detach.
-- 
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
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