| From: | Noah Misch <noah(at)leadboat(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | pgsql-hackers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Postmaster self-deadlock due to PLT linkage resolution |
| Date: | 2022-08-30 02:42:01 |
| Message-ID: | 20220830024201.GA932727@rfd.leadboat.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On Mon, Aug 29, 2022 at 03:43:55PM -0400, Tom Lane wrote:
> I'd originally intended to make this code "#ifdef __NetBSD__",
> but on looking into the FreeBSD sources I find much the same locking
> logic in their dynamic loader, and now I'm wondering if such behavior
> isn't pretty standard.
I doubt it's standard. POSIX specifies select() to be async-signal-safe.
This NetBSD bug makes select() not be async-signal-safe.
> The added calls should have negligible cost,
> so it doesn't seem unreasonable to do them everywhere.
Agreed. I would make the comment mention the NetBSD version that prompted
this, so we have a better chance of removing the workaround in a few decades.
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