diff options
Diffstat (limited to 'src/backend/access/heap/hio.c')
| -rw-r--r-- | src/backend/access/heap/hio.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/backend/access/heap/hio.c b/src/backend/access/heap/hio.c index b4ea84a6141..26db1e3d8d0 100644 --- a/src/backend/access/heap/hio.c +++ b/src/backend/access/heap/hio.c @@ -178,6 +178,10 @@ GetVisibilityMapPins(Relation relation, Buffer buffer1, Buffer buffer2, * happen if space is freed in that page after heap_update finds there's not * enough there). In that case, the page will be pinned and locked only once. * + * For the vmbuffer and vmbuffer_other arguments, we avoid deadlock by + * locking them only after locking the corresponding heap page, and taking + * no further lwlocks while they are locked. + * * We normally use FSM to help us find free space. However, * if HEAP_INSERT_SKIP_FSM is specified, we just append a new empty page to * the end of the relation if the tuple won't fit on the current target page. |