diff options
Diffstat (limited to 'sql/mdl.cc')
| -rw-r--r-- | sql/mdl.cc | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/sql/mdl.cc b/sql/mdl.cc index ddf518fbb1c..ba938f8714b 100644 --- a/sql/mdl.cc +++ b/sql/mdl.cc @@ -1689,9 +1689,8 @@ err: shared mode). @note There can be only one upgrader for a lock or we will have deadlock. - This invariant is ensured by code outside of metadata subsystem usually - by obtaining some sort of exclusive table-level lock (e.g. TL_WRITE, - TL_WRITE_ALLOW_READ) before performing upgrade of metadata lock. + This invariant is ensured by the fact that upgradeable locks SNW + and SNRW are not compatible with each other and themselves. @retval FALSE Success @retval TRUE Failure (thread was killed) |