Re: [HACKERS] Re: [HACKERS] Re: [HACKERS] Re: [HACKERS] Windows service is not starting so there’s message in log: FATAL: "could not create shared memory segment “Global/PostgreSQL.851401618”: Permission denied” - Mailing list pgsql-hackers

On Mon, May 16, 2016 at 9:45 AM, Michael Paquier <michael.paquier@gmail.com> wrote:
>
> On Sun, May 15, 2016 at 3:34 PM, Amit Kapila <amit.kapila16@gmail.com> wrote:
> > Sounds sensible, but if we want to that route, shall we have some mechanism
> > such that if retrying it for 10 times (10 is somewhat arbitrary, but we
> > retry 10 times in PGSharedMemoryCreate, so may be there is some consistency)
> > doesn't give us unique name and we are getting EACCES error, then just throw
> > the error instead of more retries.  This is to ensure that if the API is
> > returning EACCES due to reason other than duplicate handle, then we won't
> > retry indefinitely.
>
> The logic in win32_shmem.c relies on the fact that a segment will be
> recycled, and the retry is here because it may take time at OS level.

> On top of that it relies on the segment names being unique across
> systems. So it seems to me that it is not worth the complication to
> duplicate that logic in the dsm implementation.