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Bug#40536: SELECT is blocked by INSERT DELAYED waiting on

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upgrading lock, even with low_priority_updates

The problem is that there is no mechanism to control whether a
delayed insert takes a high or low priority lock on a table.

The solution is to modify the delayed insert thread ("handler")
to take into account the global value of low_priority_updates
when taking table locks. The value of low_priority_updates is
retrieved when the insert delayed thread is created and will
remain the same for the duration of the thread.
This commit is contained in:
Davi Arnaut
2009-02-03 15:16:24 -02:00
parent 6fb2ba1c3d
commit bc03c9ef19
5 changed files with 81 additions and 5 deletions
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3
include/thr_lock.h
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@@ -159,7 +159,8 @@ void thr_multi_unlock(THR_LOCK_DATA **data,uint count);
void thr_abort_locks(THR_LOCK *lock, my_bool upgrade_lock);
my_bool thr_abort_locks_for_thread(THR_LOCK *lock, my_thread_id thread);
void thr_print_locks(void); /* For debugging */
my_bool thr_upgrade_write_delay_lock(THR_LOCK_DATA *data);
my_bool thr_upgrade_write_delay_lock(THR_LOCK_DATA *data,
enum thr_lock_type new_lock_type);
void thr_downgrade_write_lock(THR_LOCK_DATA *data,
enum thr_lock_type new_lock_type);
my_bool thr_reschedule_write_lock(THR_LOCK_DATA *data);