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.NET runtime contention events

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These runtime events capture information about monitor lock contentions such as with Monitor.Enter or the C# lock keyword. For more information about how to use these events for diagnostic purposes, see logging and tracing .NET applications

ContentionStart_V2 event

This event is emitted at the start of a monitor lock contention.

Keyword for raising the event Level
ContentionKeyword (0x4000) Informational (4)

The following table shows event information.

Event Event ID Raised when
ContentionStart_V2 81 A monitor lock contention starts.
Field name Data type Description
Flags win:UInt8 0 for managed; 1 for native.
ClrInstanceID win:UInt16 Unique ID for the instance of CoreCLR.
LockObjectID win:Pointer Address of the lock object.
LockOwnerThreadID win:Pointer Address of the thread that owns the lock.

ContentionStop_V1 event

This event is emitted at the end of a monitor lock contention.

Keyword for raising the event Level
ContentionKeyword (0x4000) Informational (4)

The following table shows event information.

Event Event ID Raised when
ContentionStop_V1 91 A monitor lock contention ends.
Field name Data type Description
Flags win:UInt8 0 for managed; 1 for native.
ClrInstanceID win:UInt16 Unique ID for the instance of CoreCLR.
DurationNs win:Double Duration of the contention in nanoseconds.