cleanup: @@mutex_deadlock_detector -> @@debug_mutex_deadlock_detector

mysql-test/include/have_mutex_deadlock_detector.inc

---require r/have_mutex_deadlock_detector.require
-disable_query_log;
-select 1 from information_schema.global_variables where variable_name = "mutex_deadlock_detector";
-enable_query_log;
+if (`select count(*)=0 from information_schema.global_variables where variable_name = "debug_mutex_deadlock_detector"`) {
+  skip needs safemutex deadlock detector;
+}

mysql-test/r/have_mutex_deadlock_detector.require

-1
-1

mysql-test/suite/sys_vars/r/debug_mutex_deadlock_detector_basic.result

+select @@global.debug_mutex_deadlock_detector;
+@@global.debug_mutex_deadlock_detector
+1
+select @@session.debug_mutex_deadlock_detector;
+ERROR HY000: Variable 'debug_mutex_deadlock_detector' is a GLOBAL variable
+show global variables like 'debug_mutex_deadlock_detector';
+Variable_name	Value
+debug_mutex_deadlock_detector	ON
+show session variables like 'debug_mutex_deadlock_detector';
+Variable_name	Value
+debug_mutex_deadlock_detector	ON
+select * from information_schema.global_variables where variable_name='debug_mutex_deadlock_detector';
+VARIABLE_NAME	VARIABLE_VALUE
+DEBUG_MUTEX_DEADLOCK_DETECTOR	ON
+select * from information_schema.session_variables where variable_name='debug_mutex_deadlock_detector';
+VARIABLE_NAME	VARIABLE_VALUE
+DEBUG_MUTEX_DEADLOCK_DETECTOR	ON
+set global debug_mutex_deadlock_detector=1;
+ERROR HY000: Variable 'debug_mutex_deadlock_detector' is a read only variable
+set session debug_mutex_deadlock_detector=1;
+ERROR HY000: Variable 'debug_mutex_deadlock_detector' is a read only variable

mysql-test/suite/sys_vars/r/mutex_deadlock_detector_basic.result

-select @@global.mutex_deadlock_detector;
-@@global.mutex_deadlock_detector
-1
-select @@session.mutex_deadlock_detector;
-ERROR HY000: Variable 'mutex_deadlock_detector' is a GLOBAL variable
-show global variables like 'mutex_deadlock_detector';
-Variable_name	Value
-mutex_deadlock_detector	ON
-show session variables like 'mutex_deadlock_detector';
-Variable_name	Value
-mutex_deadlock_detector	ON
-select * from information_schema.global_variables where variable_name='mutex_deadlock_detector';
-VARIABLE_NAME	VARIABLE_VALUE
-MUTEX_DEADLOCK_DETECTOR	ON
-select * from information_schema.session_variables where variable_name='mutex_deadlock_detector';
-VARIABLE_NAME	VARIABLE_VALUE
-MUTEX_DEADLOCK_DETECTOR	ON
-set global mutex_deadlock_detector=1;
-ERROR HY000: Variable 'mutex_deadlock_detector' is a read only variable
-set session mutex_deadlock_detector=1;
-ERROR HY000: Variable 'mutex_deadlock_detector' is a read only variable

mysql-test/suite/sys_vars/t/mutex_deadlock_detector_basic.test → mysql-test/suite/sys_vars/t/debug_mutex_deadlock_detector_basic.test

@@ -5,19 +5,19 @@
 #
 # show the global and session values;
 #
-select @@global.mutex_deadlock_detector;
+select @@global.debug_mutex_deadlock_detector;
 --error ER_INCORRECT_GLOBAL_LOCAL_VAR
-select @@session.mutex_deadlock_detector;
-show global variables like 'mutex_deadlock_detector';
-show session variables like 'mutex_deadlock_detector';
-select * from information_schema.global_variables where variable_name='mutex_deadlock_detector';
-select * from information_schema.session_variables where variable_name='mutex_deadlock_detector';
+select @@session.debug_mutex_deadlock_detector;
+show global variables like 'debug_mutex_deadlock_detector';
+show session variables like 'debug_mutex_deadlock_detector';
+select * from information_schema.global_variables where variable_name='debug_mutex_deadlock_detector';
+select * from information_schema.session_variables where variable_name='debug_mutex_deadlock_detector';
 
 #
 # show that it's read-only
 #
 --error ER_INCORRECT_GLOBAL_LOCAL_VAR
-set global mutex_deadlock_detector=1;
+set global debug_mutex_deadlock_detector=1;
 --error ER_INCORRECT_GLOBAL_LOCAL_VAR
-set session mutex_deadlock_detector=1;
+set session debug_mutex_deadlock_detector=1;
 

sql/sys_vars.cc

@@ -4810,7 +4810,7 @@ static Sys_var_ulong Sys_extra_max_connections(
 
 #ifdef SAFE_MUTEX
 static Sys_var_mybool Sys_mutex_deadlock_detector(
-       "mutex_deadlock_detector", "Enable checking of wrong mutex usage",
+       "debug_mutex_deadlock_detector", "Enable checking of wrong mutex usage",
        READ_ONLY GLOBAL_VAR(safe_mutex_deadlock_detector),
        CMD_LINE(OPT_ARG), DEFAULT(TRUE));
 #endif