On 06/23/20 21:44, Andres Freund wrote: > I think that's way harder than what you make it sound here. The locking > for shm_mq doesn't really work inside a process. In contrast to the > single threaded case something like a volatile write to > ParallelMessagePending doesn't guarantee much, because there's no > guaranteed memory ordering between threads. And more.
It occurred to me after I sent the message this morning that my suggestion (2) could subsume (1). And requires nothing more than a single volatile write of a boolean, and getting called back at a convenient time on the single main thread. So perhaps I shouldn't have suggested (1) at all - just muddies the waters. Regards, -Chap
