| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Mikhail <mp39590(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: [PATCH] Make ENOSPC not fatal in semaphore creation |
| Date: | 2021-10-29 03:54:20 |
| Message-ID: | CA+hUKGJ-hv-xYcFunJ-efOEZTA+_UBcB1dpY8T9U0nELD6Bk_A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Oct 24, 2021 at 10:50 PM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> Sadly, although the attached proof-of-concept patch allows a
> PREFERRED_SEMAPHORES=FUTEX build to pass tests on macOS (which also
> lacks native unnamed semas), FreeBSD and Linux (which don't need this
> but are interesting to test), and it also works on OpenBSD with
> shared_memory_type=sysv, it doesn't work on OpenBSD with
> shared_memory_type=mmap (the default). I suspect OpenBSD's futex(2)
> has a bug: inherited anonymous shared mmap memory seems to confuse it
> so that wakeups are lost. Arrrgh!
FWIW I'm trying to follow up with the OpenBSD list over here, because
it'd be nice to get that working:
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