diff options
| author | Peter Geoghegan <pg@bowt.ie> | 2020-08-09 12:01:15 -0700 |
|---|---|---|
| committer | Peter Geoghegan <pg@bowt.ie> | 2020-08-09 12:01:15 -0700 |
| commit | d129c07499dbf0d5960115173515e3ce384c662a (patch) | |
| tree | 3eab2c5e5715cf65d5e393bd42a60896cea45f15 /src | |
| parent | 1b9cde51246c7773eac119b84cc18095118735de (diff) | |
| download | postgresql-d129c07499dbf0d5960115173515e3ce384c662a.tar.gz postgresql-d129c07499dbf0d5960115173515e3ce384c662a.zip | |
Correct nbtree page split lock coupling comment.
There is no reason to distinguish between readers and writers here.
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/access/nbtree/nbtinsert.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/src/backend/access/nbtree/nbtinsert.c b/src/backend/access/nbtree/nbtinsert.c index e3a44bc09e0..d36f7557c87 100644 --- a/src/backend/access/nbtree/nbtinsert.c +++ b/src/backend/access/nbtree/nbtinsert.c @@ -1861,11 +1861,9 @@ _bt_split(Relation rel, BTScanInsert itup_key, Buffer buf, Buffer cbuf, } /* - * We have to grab the right sibling (if any) and fix the prev pointer - * there. We are guaranteed that this is deadlock-free since no other - * writer will be holding a lock on that page and trying to move left, and - * all readers release locks on a page before trying to fetch its - * neighbors. + * We have to grab the original right sibling (if any) and update its prev + * link. We are guaranteed that this is deadlock-free, since we couple + * the locks in the standard order: left to right. */ if (!isrightmost) { |