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SET DEBUG_SYNC= 'RESET';
DROP TABLE IF EXISTS t1;
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: ''
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 EXECUTE 2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 EXECUTE 2';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2';
SET DEBUG_SYNC='p0 SIGNAL s1 EXECUTE 2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 SIGNAL s1 EXECUTE 2';
SET DEBUG_SYNC='p0 SIGNAL s1 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 SIGNAL s1';
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2';
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6';
SET DEBUG_SYNC='p0 WAIT_FOR s2 EXECUTE 2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 WAIT_FOR s2 EXECUTE 2';
SET DEBUG_SYNC='p0 WAIT_FOR s2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 WAIT_FOR s2';
SET DEBUG_SYNC='p0 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 CLEAR';
SET DEBUG_SYNC='p0 TEST';
SET DEBUG_SYNC='RESET';
set debug_sync='p0 signal s1 wait_for s2 timeout 6 execute 2 hit_limit 3';
set debug_sync='p0 signal s1 wait_for s2 timeout 6 execute 2';
set debug_sync='p0 signal s1 wait_for s2 timeout 6 hit_limit 3';
set debug_sync='p0 signal s1 wait_for s2 timeout 6';
set debug_sync='p0 signal s1 wait_for s2 execute 2 hit_limit 3';
set debug_sync='p0 signal s1 wait_for s2 execute 2';
set debug_sync='p0 signal s1 wait_for s2 hit_limit 3';
set debug_sync='p0 signal s1 wait_for s2';
set debug_sync='p0 signal s1 execute 2 hit_limit 3';
set debug_sync='p0 signal s1 execute 2';
set debug_sync='p0 signal s1 hit_limit 3';
set debug_sync='p0 signal s1';
set debug_sync='p0 wait_for s2 timeout 6 execute 2 hit_limit 3';
set debug_sync='p0 wait_for s2 timeout 6 execute 2';
set debug_sync='p0 wait_for s2 timeout 6 hit_limit 3';
set debug_sync='p0 wait_for s2 timeout 6';
set debug_sync='p0 wait_for s2 execute 2 hit_limit 3';
set debug_sync='p0 wait_for s2 execute 2';
set debug_sync='p0 wait_for s2 hit_limit 3';
set debug_sync='p0 wait_for s2';
set debug_sync='p0 hit_limit 3';
set debug_sync='p0 clear';
set debug_sync='p0 test';
set debug_sync='reset';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6
EXECUTE 2 HIT_LIMIT 3';
SET DEBUG_SYNC=' p0 SIGNAL s1 WAIT_FOR s2';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 ';
SET DEBUG_SYNC=' p0 SIGNAL s1 WAIT_FOR s2 ';
SET DEBUG_SYNC=' p0 SIGNAL s1 WAIT_FOR s2 ';
SET DEBUG_SYNC='';
ERROR 42000: Missing synchronization point name
SET DEBUG_SYNC=' ';
ERROR 42000: Missing synchronization point name
SET DEBUG_SYNC='p0';
ERROR 42000: Missing action after synchronization point name 'p0'
SET DEBUG_SYNC='p0 EXECUTE 2';
ERROR 42000: Missing action before EXECUTE
SET DEBUG_SYNC='p0 TIMEOUT 6 EXECUTE 2';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 TIMEOUT 6';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 WAIT_FOR s2 SIGNAL s1';
ERROR 42000: Illegal or out of order stuff: 'SIGNAL'
SET DEBUG_SYNC='p0 WAIT_FOR s2 SIGNAL s1 EXECUTE 2';
ERROR 42000: Illegal or out of order stuff: 'SIGNAL'
SET DEBUG_SYNC='p0 WAIT_FOR s2 SIGNAL s1 TIMEOUT 6 EXECUTE 2';
ERROR 42000: Illegal or out of order stuff: 'SIGNAL'
SET DEBUG_SYNC='p0 WAIT_FOR s2 SIGNAL s1 TIMEOUT 6';
ERROR 42000: Illegal or out of order stuff: 'SIGNAL'
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6 SIGNAL s1 EXECUTE 2';
ERROR 42000: Illegal or out of order stuff: 'SIGNAL'
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6 SIGNAL s1';
ERROR 42000: Illegal or out of order stuff: 'SIGNAL'
SET DEBUG_SYNC='p0 TIMEOUT 6 WAIT_FOR s2 EXECUTE 2';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 TIMEOUT 6 WAIT_FOR s2';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 SIGNAL s1 TIMEOUT 6 EXECUTE 2';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 SIGNAL s1 TIMEOUT 6';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 EXECUTE 2 SIGNAL s1 TIMEOUT 6';
ERROR 42000: Missing action before EXECUTE
SET DEBUG_SYNC='p0 TIMEOUT 6 SIGNAL s1';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 EXECUTE 2 TIMEOUT 6 SIGNAL s1';
ERROR 42000: Missing action before EXECUTE
SET DEBUG_SYNC='p0 CLEAR HIT_LIMIT 3';
ERROR 42000: Nothing must follow action CLEAR
SET DEBUG_SYNC='CLEAR';
ERROR 42000: Missing action after synchronization point name 'CLEAR'
SET DEBUG_SYNC='p0 CLEAR p0';
ERROR 42000: Nothing must follow action CLEAR
SET DEBUG_SYNC='TEST';
ERROR 42000: Missing action after synchronization point name 'TEST'
SET DEBUG_SYNC='p0 TEST p0';
ERROR 42000: Nothing must follow action TEST
SET DEBUG_SYNC='p0 RESET';
ERROR 42000: Illegal or out of order stuff: 'RESET'
SET DEBUG_SYNC='RESET p0';
ERROR 42000: Illegal or out of order stuff: 'p0'
SET DEBUG_SYNC='p0 RESET p0';
ERROR 42000: Illegal or out of order stuff: 'RESET'
SET DEBUG_SYNC='p0 SIGNAL ';
ERROR 42000: Missing signal name after action SIGNAL
SET DEBUG_SYNC='p0 WAIT_FOR ';
ERROR 42000: Missing signal name after action WAIT_FOR
SET DEBUG_SYNC='p0 SIGNAL s1 EXECUTE ';
ERROR 42000: Missing valid number after EXECUTE
SET DEBUG_SYNCx='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2 HIT_LIMIT 3';
ERROR HY000: Unknown system variable 'DEBUG_SYNCx'
SET DEBUG_SYNC='p0 SIGNAx s1 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2 HIT_LIMIT 3';
ERROR 42000: Illegal or out of order stuff: 'SIGNAx'
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOx s2 TIMEOUT 6 EXECUTE 2 HIT_LIMIT 3';
ERROR 42000: Illegal or out of order stuff: 'WAIT_FOx'
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUx 0 EXECUTE 2 HIT_LIMIT 3';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUx'
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6 EXECUTx 2 HIT_LIMIT 3';
ERROR 42000: Illegal or out of order stuff: 'EXECUTx'
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2 HIT_LIMIx 3';
ERROR 42000: Illegal or out of order stuff: 'HIT_LIMIx'
SET DEBUG_SYNC='p0 CLEARx';
ERROR 42000: Illegal or out of order stuff: 'CLEARx'
SET DEBUG_SYNC='p0 TESTx';
ERROR 42000: Illegal or out of order stuff: 'TESTx'
SET DEBUG_SYNC='RESETx';
ERROR 42000: Missing action after synchronization point name 'RESETx'
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 0x6 EXECUTE 2 HIT_LIMIT 3';
ERROR 42000: Missing valid number after TIMEOUT
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6 EXECUTE 0x2 HIT_LIMIT 3';
ERROR 42000: Missing valid number after EXECUTE
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 7 EXECUTE 2 HIT_LIMIT 0x3';
ERROR 42000: Missing valid number after HIT_LIMIT
SET DEBUG_SYNC= 7;
ERROR 42000: Incorrect argument type to variable 'debug_sync'
SET GLOBAL DEBUG_SYNC= 'p0 CLEAR';
ERROR HY000: Variable 'debug_sync' is a SESSION variable and can't be used with SET GLOBAL
SET @myvar= 'now SIGNAL from_myvar';
SET DEBUG_SYNC= @myvar;
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 'from_myvar'
SET DEBUG_SYNC= LEFT('now SIGNAL from_function_cut_here', 24);
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 'from_function'
SET DEBUG_SYNC= 'now SIGNAL something';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 'something'
SET DEBUG_SYNC= 'now WAIT_FOR nothing TIMEOUT 0';
Warnings:
Warning #### debug sync point wait timed out
SET DEBUG_SYNC= 'now SIGNAL nothing';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 'nothing'
SET DEBUG_SYNC= 'now WAIT_FOR nothing TIMEOUT 0';
SET DEBUG_SYNC= 'now SIGNAL something EXECUTE 0';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 'nothing'
SET DEBUG_SYNC= 'now WAIT_FOR anotherthing TIMEOUT 0 EXECUTE 0';
SET DEBUG_SYNC= 'now HIT_LIMIT 1';
ERROR HY000: debug sync point hit limit reached
SET DEBUG_SYNC= 'RESET';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: ''
SET DEBUG_SYNC= 'p1abcd SIGNAL s1 EXECUTE 2';
SET DEBUG_SYNC= 'p2abc SIGNAL s2 EXECUTE 2';
SET DEBUG_SYNC= 'p9abcdef SIGNAL s9 EXECUTE 2';
SET DEBUG_SYNC= 'p4a SIGNAL s4 EXECUTE 2';
SET DEBUG_SYNC= 'p5abcde SIGNAL s5 EXECUTE 2';
SET DEBUG_SYNC= 'p6ab SIGNAL s6 EXECUTE 2';
SET DEBUG_SYNC= 'p7 SIGNAL s7 EXECUTE 2';
SET DEBUG_SYNC= 'p8abcdef SIGNAL s8 EXECUTE 2';
SET DEBUG_SYNC= 'p3abcdef SIGNAL s3 EXECUTE 2';
SET DEBUG_SYNC= 'p4a TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's4'
SET DEBUG_SYNC= 'p1abcd TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's1'
SET DEBUG_SYNC= 'p7 TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's7'
SET DEBUG_SYNC= 'p9abcdef TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's9'
SET DEBUG_SYNC= 'p3abcdef TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's3'
SET DEBUG_SYNC= 'p1abcd CLEAR';
SET DEBUG_SYNC= 'p2abc CLEAR';
SET DEBUG_SYNC= 'p5abcde CLEAR';
SET DEBUG_SYNC= 'p6ab CLEAR';
SET DEBUG_SYNC= 'p8abcdef CLEAR';
SET DEBUG_SYNC= 'p9abcdef CLEAR';
SET DEBUG_SYNC= 'p3abcdef CLEAR';
SET DEBUG_SYNC= 'p4a CLEAR';
SET DEBUG_SYNC= 'p7 CLEAR';
SET DEBUG_SYNC= 'p1abcd TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's3'
SET DEBUG_SYNC= 'p7 TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's3'
SET DEBUG_SYNC= 'p9abcdef TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's3'
SET DEBUG_SYNC= 'RESET';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: ''
CREATE USER mysqltest_1@localhost;
GRANT SUPER ON *.* TO mysqltest_1@localhost;
connect con1,localhost,mysqltest_1,,;
SET DEBUG_SYNC= 'RESET';
disconnect con1;
connection default;
DROP USER mysqltest_1@localhost;
CREATE USER mysqltest_2@localhost;
GRANT ALL ON *.* TO mysqltest_2@localhost;
REVOKE SUPER ON *.* FROM mysqltest_2@localhost;
connect con1,localhost,mysqltest_2,,;
SET DEBUG_SYNC= 'RESET';
ERROR 42000: Access denied; you need (at least one of) the SUPER privilege(s) for this operation
disconnect con1;
connection default;
DROP USER mysqltest_2@localhost;
SET DEBUG_SYNC= 'RESET';
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (c1 INT);
connect con1,localhost,root,,;
SET DEBUG_SYNC= 'before_lock_tables_takes_lock
SIGNAL opened WAIT_FOR flushed';
INSERT INTO t1 VALUES(1);
connection default;
SET DEBUG_SYNC= 'now WAIT_FOR opened';
SET DEBUG_SYNC= 'after_flush_unlock SIGNAL flushed';
FLUSH TABLE t1;
connection con1;
disconnect con1;
connection default;
DROP TABLE t1;
SET DEBUG_SYNC= 'RESET';
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1);
SELECT GET_LOCK('mysqltest_lock', 100);
GET_LOCK('mysqltest_lock', 100)
1
connect con1,localhost,root,,;
# Sending:
UPDATE t1 SET c1=GET_LOCK('mysqltest_lock', 100);;
connect con2,localhost,root,,;
SET DEBUG_SYNC= 'wait_for_lock SIGNAL locked EXECUTE 2';
INSERT INTO t1 VALUES (1);
connection default;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
SELECT RELEASE_LOCK('mysqltest_lock');
RELEASE_LOCK('mysqltest_lock')
1
connection con1;
# Reaping UPDATE
SELECT RELEASE_LOCK('mysqltest_lock');
RELEASE_LOCK('mysqltest_lock')
1
connection con2;
retrieve INSERT result.
disconnect con1;
disconnect con2;
connection default;
DROP TABLE t1;
SET DEBUG_SYNC= 'RESET';
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