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Re: scratch/sigchld-fd 8f0ce42 1/2: Fix deadlock when receiving SIGCHLD


From: Andreas Schwab
Subject: Re: scratch/sigchld-fd 8f0ce42 1/2: Fix deadlock when receiving SIGCHLD during 'pselect'.
Date: Wed, 20 Jan 2021 09:37:31 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1.90 (gnu/linux)

On Jan 20 2021, Eli Zaretskii wrote:

> AFAIU, this is an issue for programs that install a SIGCHLD handler
> immediately before calling pselect.  But Emacs has a SIGCHLD handler
> installed at all times, so if the signal hits outside of the pselect
> call, we should be able to detect that reliably.

No, the race between checking for the signal and entering pselect still
exists.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
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