Quelle  global_read_lock.test  Sprache: unbekannt

# Tests for PERFORMANCE_SCHEMA
#
# Test the effect of a flush tables with read lock on setup_ tables.

--source include/not_embedded.inc
--source include/have_perfschema.inc

use performance_schema;

# Make test robust against errors in other tests.
# Ensure that instrumentation is turned on when we create new connection.
update performance_schema.setup_instruments set enabled='YES';

create user pfsuser@localhost;
grant SELECT, UPDATE, LOCK TABLES on performance_schema.* to pfsuser@localhost;
flush privileges;

connect (con1, localhost, pfsuser, ,"*NO-ONE*");

lock tables performance_schema.setup_instruments read;
--disable_result_log
select * from performance_schema.setup_instruments;
--enable_result_log
unlock tables;

lock tables performance_schema.setup_instruments write;
update performance_schema.setup_instruments set enabled='NO';
update performance_schema.setup_instruments set enabled='YES';
unlock tables;

connection default;

flush tables with read lock;

connection con1;

lock tables performance_schema.setup_instruments read;
--disable_result_log
select * from performance_schema.setup_instruments;
--enable_result_log
unlock tables;

# This will block
--send
lock tables performance_schema.setup_instruments write;

connection default;

let $wait_condition= select 1 from performance_schema.events_waits_current where event_name like "wait/synch/cond/sql/MDL_context::COND_wait_status";

--source include/wait_condition.inc

# Observe the blocked thread in the performance schema :)
select event_name,
  left(source, locate(":", source)) as short_source,
  if(timer_end IS NULL, NULL, "SET") as timer_end,
  if(timer_wait IS NULL, NULL, "SET") as timer_wait,
  operation
  from performance_schema.events_waits_current
  where event_name like "wait/synch/cond/sql/MDL_context::COND_wait_status";

unlock tables;

connection con1;
--reap

update performance_schema.setup_instruments set enabled='NO';
update performance_schema.setup_instruments set enabled='YES';
unlock tables;

disconnect con1;

connection default;

drop user pfsuser@localhost;
flush privileges;