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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.
21 lines
856 B
Text
21 lines
856 B
Text
select @@global.debug_sync;
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ERROR HY000: Variable 'debug_sync' is a SESSION variable
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select @@session.debug_sync;
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@@session.debug_sync
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ON - current signals: ''
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show global variables like "debug_sync";
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Variable_name Value
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show session variables like "debug_sync";
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Variable_name Value
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debug_sync ON - current signals: ''
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select * from information_schema.global_variables where variable_name="debug_sync";
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VARIABLE_NAME VARIABLE_VALUE
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select * from information_schema.session_variables where variable_name="debug_sync";
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VARIABLE_NAME VARIABLE_VALUE
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DEBUG_SYNC ON - current signals: ''
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set @@session.debug_sync=1;
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ERROR 42000: Incorrect argument type to variable 'debug_sync'
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set @@session.debug_sync=1.1;
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ERROR 42000: Incorrect argument type to variable 'debug_sync'
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set @@session.debug_sync=1e1;
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ERROR 42000: Incorrect argument type to variable 'debug_sync'
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