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MDEV-35708 lock_rec_get_prev() returns only the first record lock

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It's supposed that the function gets the previous lock set on a record.
But if there are several locks set on a record, it will return only the
first one. Continue locks list iteration till the certain lock even if
the certain bit in lock bitmap is set.
This commit is contained in:
Vlad Lesin 2024-12-04 19:56:46 +03:00
parent 07b77e862c
commit 06169358d5
1 changed files with 3 additions and 2 deletions
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5
storage/innobase/lock/lock0lock.cc
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@ -984,13 +984,14 @@ lock_rec_get_prev(
ut_ad(!in_lock->is_table());
const page_id_t id{in_lock->un_member.rec_lock.page_id};
hash_cell_t *cell= lock_sys.hash_get(in_lock->type_mode).cell_get(id.fold());
lock_t *prev_lock= nullptr;
for (lock_t *lock= lock_sys_t::get_first(*cell, id); lock != in_lock;
lock= lock_rec_get_next_on_page(lock))
if (lock_rec_get_nth_bit(lock, heap_no))
return lock;
prev_lock= lock;
return nullptr;
return prev_lock;
}
/*============= FUNCTIONS FOR ANALYZING RECORD LOCK QUEUE ================*/