Hello, While testing on the current PG master, I noticed a problem between backends communicating over a shared memory queue. I think `shm_mq_sendv()` fails to flush the queue, even if `force_flush` is set to true, if the receiver is not yet attached to the queue. This simple fix solves the problem for me.
On another note, `shm_mq.h` declares `shm_mq_flush()`, but I don't see it being implemented. Maybe just a leftover from the previous work? Though it seems useful to implement that API. Thanks, Pavan -- Pavan Deolasee EnterpriseDB: https://www.enterprisedb..com
0001-Flush-the-queue-even-if-receiver-has-not-attached.patch
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