This documentation is archived and is not being maintained.

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.




RegisterMemoryNotificationCallback returned successfully.


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.


The call timed out.


The caller does not own the lock.


An event was canceled while a blocked thread or fiber was waiting on it.


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 .NET Framework System Requirements.

Header: MSCorEE.idl

Library: Included as a resource in MSCorEE.dll

.NET Framework Versions: 3.5 SP1, 3.5, 3.0 SP1, 3.0, 2.0 SP1, 2.0