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Simplified THD::current_linfo locking

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LOG_INFO::lock was useless. It could've only protect against concurrent
iterators execution, which was already protected by LOCK_thread_count.

Use LOCK_thd_data instead of LOCK_thread_count as a protection against
THD::current_linfo reset.

Aim is to reduce usage of LOCK_thread_count and COND_thread_count.
Part of MDEV-15135.
This commit is contained in:
Sergey Vojtovich 2019-01-20 12:51:20 +04:00
commit 891be49a36
5 changed files with 10 additions and 26 deletions
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mysql-test/suite/perfschema/r/setup_instruments_defaults.result
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@ -25,7 +25,6 @@ WHERE name IN (
AND enabled = 'yes' AND timed = 'yes'
ORDER BY name;
NAME ENABLED TIMED
wait/synch/mutex/sql/LOG_INFO::lock YES YES
wait/synch/mutex/sql/THD::LOCK_thd_data YES YES
SELECT * FROM performance_schema.setup_instruments
WHERE name = 'wait/synch/mutex/sql/hash_filo::lock'