Avoid bogus TwoPhaseState locking sequences
The optimized code in 728bd991c3c4 contains a few invalid locking
sequences. To wit, the original code would try to acquire an lwlock
that it already holds. Avoid this by moving lock acquisitions to
higher-level code, and install appropriate assertions in low-level that
the correct mode is held.
Authors: Michael Paquier, Álvaro Herrera
Reported-By: chuanting wang
Bug: #14680
Discussion: https://postgr.es/m/20170531033228.1487.10124@wrigleys.postgresql.org
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/e90ceeaa495f5f40f224bcf84d2b0700eae8d7a3
Modified Files
--------------
src/backend/access/transam/twophase.c | 87 +++++++++++++++++++----------------
src/backend/access/transam/xact.c | 68 ++++++++++++++-------------
2 files changed, 83 insertions(+), 72 deletions(-)
