From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
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To: | pgsql-committers(at)lists(dot)postgresql(dot)org |
Subject: | pgsql: Fix nbtree backward scan race condition comments. |
Date: | 2023-12-08 23:38:09 |
Message-ID: | E1rBkQ5-009GsF-3N@gemulon.postgresql.org |
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Thread: | |
Lists: | pgsql-committers |
Fix nbtree backward scan race condition comments.
Remove comments that supposed that holding a pin was a useful interlock
for _bt_walk_left(). There are times when _bt_walk_left() doesn't hold
either a lock or a pin on any page, so clearly this can't be true.
_bt_walk_left() is even prepared to deal with concurrent deletion of
both the original page and any pages to its left.
Oversight in commit 2ed5b87f96.
Branch
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master
Details
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https://git.postgresql.org/pg/commitdiff/aa210e0c121eb8f58c86d4fcc833a5a6fbb6f5a9
Modified Files
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src/backend/access/nbtree/nbtsearch.c | 27 ++++++++-------------------
1 file changed, 8 insertions(+), 19 deletions(-)
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