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Date: Mon, 21 Nov 2022 23:41:03 -0600
From: "A. Wilcox" <>
Subject: Re: sem_post() can miss waiters

On Nov 21, 2022, at 6:09 PM, Rich Felker <> wrote:
> Regarding your second solution, I think it's more elegant and
> efficient and would be preferable if we were doing this from scratch,
> but changing SEM_VALUE_MAX is arguably an ABI change we should not
> make.

With my distro hat on: this isn’t used by too many programs.

Debian Code Search returned a module of Boost.  Otherwise, all apps
correctly use sysconf(_SC_SEM_VALUE_MAX) in my cursory glance.

With my gcompat hat on: yes, please don’t change it.

The current value matches glibc and while it doesn’t seem many things
use it, I would hate to have to debug those kind of corner cases in
binary blob code.

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