[issue35423] Signal handling machinery still relies on "pending calls".

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

In the master branch, the signal handler only uses pending calls to report error on writing into the "wakeup_fd" (fd or socket handle):

commit c08177a1ccad2ed0d50898c2731b518c631aed14
Author: Antoine Pitrou <pitrou at free.fr>
Date:   Wed Jun 28 23:29:29 2017 +0200

    bpo-30703: Improve signal delivery (#2415)

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nosy: +vstinner

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<https://bugs.python.org/issue35423>
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