Thomas Munro <> writes:
> On Tue, Oct 11, 2016 at 5:57 AM, Tom Lane <> wrote:
>> (I'm a little suspicious that older variants of FreeBSD might not
>> have working sem_init, like the other *BSD variants, necessitating
>> a run-time test there.  But we'll cross that bridge when we come
>> to it.)

> The sem_init man page from FreeBSD 8.4[1] (EOL August 2015) and earlier said:
>      This implementation does not support shared semaphores, and reports this
>      fact by setting errno to EPERM.
> FreeBSD 9.0 (released January 2012) reimplemented semaphores and
> removed those words from that man page[2].

Yeah, in subsequent googling I found other mentions of this having been
added in FreeBSD 9.0.  But that will be more than 5 years old by the
time PG 10 gets out.

> All current releases[3] support it, though I guess there may be 8.4
> machines out there a year and a bit after EOL.

We don't have anything older than 9.0 in the buildfarm, which I take
to indicate that nobody particularly cares about older versions anymore.
I would just as soon not add a run-time test in configure (it breaks
cross-compiles), so I'd rather wait and see if anyone complains.

                        regards, tom lane

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