Re: parallel mode and parallel contexts

On Tue, Jan 20, 2015 at 9:41 AM, Amit Kapila <amit.kapila16@gmail.com> wrote:
> It seems [WaitForBackgroundWorkerShutdown] has possibility to wait forever.
> Assume one of the worker is not able to start (not able to attach
> to shared memory or some other reason), then status returned by
> GetBackgroundWorkerPid() will be BGWH_NOT_YET_STARTED
> and after that it can wait forever in WaitLatch.

I don't think that's right.  The status only remains
BGWH_NOT_YET_STARTED until the postmaster forks the child process.  At
that point it immediately changes to BGWH_STARTED.  If it starts up
and then dies early on, for example because it can't attach to shared
memory or somesuch, the status will change to BGWH_STOPPED.

-- 
Robert Haas
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