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ICorProfilerInfo13::CreateHandle method

  • Straipsnis

Creates a handle that wraps a specified object.

Syntax

    HRESULT CreateHandle(
                [in] ObjectID            object,
                [in] COR_PRF_HANDLE_TYPE type,
                [out] ObjectHandleID*    pHandle);

Parameters

object
[in] The object reference to wrap with a handle.

type
[in] The type of handle to create.

pHandle
[out] A caller-provided pointer that will point to the handle created to wrap the specified object.

Remarks

Following are the expected usages depending on the specified COR_PRF_HANDLE_TYPE value:

  • COR_PRF_HANDLE_TYPE_WEAK: Monitors if an object stays in memory over time. If the wrapped object has been collected, ICorProfilerInfo13::GetObjectIDFromHandle returns a null ObjectID.
  • COR_PRF_HANDLE_TYPE_STRONG: Enforces that an object survives garbage collections even if no other object references it.
  • COR_PRF_HANDLE_TYPE_PINNED: Same as a strong handle but also ensures that the object stays at the same address in memory during garbage collections.

To ensure that the object reference is valid, this method has to be called from a ICorProfilerCallback method such as ICorProfilerCallback::ObjectAllocated. You cannot call CreateHandle from an EventPipe asynchronous listener. The object received via an event payload might have been disposed or moved in memory if a garbage collection occurred between the time the event was emitted and when it was received.

Do not forget to call ICorProfilerInfo13::DestroyHandle once a created handle is no longer needed. It is recommended to have less than 4096 handles allocated at the same time to avoid impacting the performance of the garbage collector.

Requirements

Platforms: See .NET supported operating systems.

Header: CorProf.idl, CorProf.h

.NET Versions: Available since .NET 7.0

See also