pgsql: Revert "Cannot use WL_SOCKET_WRITEABLE without WL_SOCKET_READABL

From: Jeff Davis <jdavis(at)postgresql(dot)org>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Revert "Cannot use WL_SOCKET_WRITEABLE without WL_SOCKET_READABL
Date: 2020-12-15 07:48:23
Message-ID: E1kp54J-0004eG-IH@gemulon.postgresql.org
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Revert "Cannot use WL_SOCKET_WRITEABLE without WL_SOCKET_READABLE."

This reverts commit 3a9e64aa0d96c8ffb6c682b082d0f72b1d373327.

Commit 4bad60e3 fixed the root of the problem that 3a9e64aa worked
around.

This enables proper pipelining of commands after terminating
replication, eliminating an undocumented limitation.

Discussion: https://postgr.es/m/3d57bc29-4459-578b-79cb-7641baf53c57%40iki.fi
Backpatch-through: 9.5

Branch
------
REL_12_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/706d84fe701ef9a8a5b04d2df013e29ea3f7ca74

Modified Files
--------------
src/backend/replication/walsender.c | 26 ++++++++++----------------
1 file changed, 10 insertions(+), 16 deletions(-)

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