Re: [HACKERS] Atomics for heap_parallelscan_nextpage()

Andres Freund <andres@anarazel.de> writes:
> On August 16, 2017 3:09:27 PM PDT, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> I wonder whether it's sensible to have --enable-cassert have the effect
>> of filling memory allocated by ShmemAlloc or the DSA code with junk (as
>> palloc does) instead of leaving it at zeroes.  It's not modeling the
>> same kind of effect, since we have no shmem-freeing primitives, but
>> it might be useful for this sort of thing.

> We kind of do - crash restarts... So yes, that's probably a good idea.

Crash restart releases the shmem segment and acquires a new one,
doesn't it?  Or am I misremembering?  I thought that it did do so,
if only to make darn sure that no old processes remain connected
to shmem.
        regards, tom lane