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This wait type is described below, and is really just a CLR worker thread waiting for something to do, similar to CLR_AUTO_EVENT.
(Books Online description: “Occurs when a task is currently performing CLR execution and is waiting for a specific manual event to be initiated.”)
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Added in SQL Server version:
Removed in SQL Server version:
Extended Events wait_type value:
The map_key value in sys.dm_xe_map_values is 217 in 2008 and 2008 R2, 224 in 2012, and 231 in 2014 RTM. After 2014 RTM, you must check the DMV to get the latest value as some map_key values have changed in later builds.
The only time you should be concerned about this wait type is if you are using a ManualResetEvent in an unsafe assembly. For safe assemblies, this wait type can be ignored.
This wait type is one that I usually filter out as a benign wait when doing wait statistics analysis.
Known occurrences in SQL Server (list number matches call stack list):
- Waiting for a manual reset event
Abbreviated call stacks (list number matches known occurrences list):