On Fri, Dec 8, 2017 at 2:23 PM, Thomas Munro
<thomas.munro@enterprisedb.com> wrote:
> On Fri, Dec 8, 2017 at 1:57 PM, Peter Geoghegan <pg@bowt.ie> wrote:
>> 1. Thomas' barrier abstraction was added by commit 1145acc7. I think
>> that you should use a static barrier in tuplesort.c now, and rip out
>> the ConditionVariable fields in the Sharedsort struct.
>
> ... So I think we'd need to add an extra barrier
> function that lets you change the party size of a static barrier.
Something like the attached (untested), which would allow
_bt_begin_parallel() to call BarrierInit(&barrier, request + 1), then
BarrierForgetParticipants(&barrier, request -
pcxt->nworkers_launched), and then all the condition variable loop
stuff can be replaced with a well placed call to
BarrierArriveAndWait(&barrier, WAIT_EVENT_SOMETHING_SOMETHING).
--
Thomas Munro
http://www.enterprisedb.com
