diff options
Diffstat (limited to 'mysys/thr_lock.c')
| -rw-r--r-- | mysys/thr_lock.c | 20 |
1 files changed, 7 insertions, 13 deletions
diff --git a/mysys/thr_lock.c b/mysys/thr_lock.c index 7f7be4835a5..ff70faaefea 100644 --- a/mysys/thr_lock.c +++ b/mysys/thr_lock.c @@ -24,7 +24,7 @@ Locks are prioritized according to: The current lock types are: -TL_READ # Low priority read +TL_READ # Low priority read TL_READ_WITH_SHARED_LOCKS TL_READ_HIGH_PRIORITY # High priority read TL_READ_NO_INSERT # Read without concurrent inserts @@ -57,8 +57,12 @@ check_status: In MyISAM this is a simple check if the insert can be done at the end of the datafile. update_status: - Before a write lock is released, this function is called. - In MyISAM this functions updates the count and length of the datafile + in thr_reschedule_write_lock(), when an insert delayed thread + downgrades TL_WRITE lock to TL_WRITE_DELAYED, to allow SELECT + threads to proceed. + A storage engine should also call update_status internally + in the ::external_lock(F_UNLCK) method. + In MyISAM and CSV this functions updates the length of the datafile. get_status: When one gets a lock this functions is called. In MyISAM this stores the number of rows and size of the datafile @@ -783,16 +787,6 @@ void thr_unlock(THR_LOCK_DATA *data) } else lock->write.last=data->prev; - if (lock_type >= TL_WRITE_CONCURRENT_INSERT) - { - if (lock->update_status) - (*lock->update_status)(data->status_param); - } - else - { - if (lock->restore_status) - (*lock->restore_status)(data->status_param); - } if (lock_type == TL_READ_NO_INSERT) lock->read_no_write_count--; data->type=TL_UNLOCK; /* Mark unlocked */ |