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Implement multiple-signal debug_sync

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The patch is inspired from MySQL. Instead of using a single String to
hold the current active debug_sync signal, use a Hash_set to store
LEX_STRINGS. This patch ensures that a signal can not be lost, by being
overwritten by another thread via set DEBUG_SYNC = '... SIGNAL ...';

All signals are kepts "alive" until they are consumed by a wait event.

This requires updating test cases that assume the GLOBAL signal is never
consumed.

Follow-up work needed:
Port the additional syntax that allows one to set multiple signals
and also conditionally deactivate signals when waiting.
This commit is contained in:
Vicențiu Ciorbaru
2021-09-28 22:17:59 +03:00
parent cc08872c16
commit 8885225de6
7 changed files with 162 additions and 48 deletions
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6
mysql-test/suite/sys_vars/r/debug_sync_basic.result
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@@ -2,17 +2,17 @@ select @@global.debug_sync;
ERROR HY000: Variable 'debug_sync' is a SESSION variable
select @@session.debug_sync;
@@session.debug_sync
ON - current signal: ''
ON - current signals: ''
show global variables like "debug_sync";
Variable_name Value
show session variables like "debug_sync";
Variable_name Value
debug_sync ON - current signal: ''
debug_sync ON - current signals: ''
select * from information_schema.global_variables where variable_name="debug_sync";
VARIABLE_NAME VARIABLE_VALUE
select * from information_schema.session_variables where variable_name="debug_sync";
VARIABLE_NAME VARIABLE_VALUE
DEBUG_SYNC ON - current signal: ''
DEBUG_SYNC ON - current signals: ''
set @@session.debug_sync=1;
ERROR 42000: Incorrect argument type to variable 'debug_sync'
set @@session.debug_sync=1.1;