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Description:
This wait type is when a thread is calling out to Windows while shutting down a Service Broker endpoint.
(Books Online description: N/A)
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Added in SQL Server version:
2008
Removed in SQL Server version:
N/A
Extended Events wait_type value:
The map_key value in sys.dm_xe_map_values is 525 in 2008 and 2008 R2, 573 in 2012, and 589 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.
Other information:
I have not seen this wait type be a noticeable contention point.
Note that when a thread calls out to Windows, the thread changes from non-preemptive (SQL Server controls the thread) to preemptive (Windows controls the thread) mode. The thread’s state will be listed as RUNNING, as SQL Server doesn’t know what Windows is doing with the thread.
Known occurrences in SQL Server (list number matches call stack list):
- Shutting down a Service Broker endpoint as part of stopping Service Broker
Abbreviated call stacks (list number matches known occurrences list):
- SOS_Task::PopWait+b1
SOS_ExternalAutoWait::~SOS_ExternalAutoWait+7c
SOS_Task::AutoSwitchPreemptive::~AutoSwitchPreemptive+5d
CSbTransportMgr::Shutdown+4d1
CUcsManager::Shutdown+2ac
CServiceBrokerMgr::DoShutDown+83
CServiceBrokerMgr::DoStartUp+e
CServiceBrokerMgr::PrimaryEventHandler+441
CSbEventHandler::Invoke+19
CSbTask::TaskStart+14b
CSbTask::BeginTaskStart+17
SOS_Task::Param::Execute+21e
SOS_Scheduler::RunTask+ab