IHostMemoryManager::RegisterMemoryNotificationCallback Method

Registers a pointer to a callback function that the host invokes to notify the common language runtime (CLR) of the current memory load on the computer.


HRESULT RegisterMemoryNotificationCallback (  
    [in] ICLRMemoryNotificationCallback* pCallback  


[in] An interface pointer to an ICLRMemoryNotificationCallback instance that is implemented by the CLR.

Return Value

HRESULT Description
S_OK RegisterMemoryNotificationCallback returned successfully.
HOST_E_CLRNOTAVAILABLE The CLR has not been loaded into a process, or the CLR is in a state in which it cannot run managed code or process the call successfully.
HOST_E_TIMEOUT The call timed out.
HOST_E_NOT_OWNER The caller does not own the lock.
HOST_E_ABANDONED An event was canceled while a blocked thread or fiber was waiting on it.
E_FAIL An unknown catastrophic failure occurred. When a method returns E_FAIL, the CLR is no longer usable within the process. Subsequent calls to hosting methods return HOST_E_CLRNOTAVAILABLE.


Because the ICLRMemoryNotificationCallback interface defines only one method (ICLRMemoryNotificationCallback::OnMemoryNotification), and because pCallback is a pointer to an ICLRMemoryNotificationCallback instance provided by the CLR, the registration is effectively for the callback function itself. The host invokes OnMemoryNotification to report memory pressure conditions, rather than using the standard Win32 CreateMemoryResourceNotification function. For more information, see the Windows Platform documentation.


Calls to OnMemoryNotification never block. They always return immediately.


Platforms: See System Requirements.

Header: MSCorEE.h

Library: Included as a resource in MSCorEE.dll

.NET Framework Versions: Available since 2.0

See Also

ICLRMemoryNotificationCallback Interface
IHostMemoryManager Interface