Requests that the host close a port that was opened through an earlier call to CreateIoCompletionPort.
[in] The handle of the port to close.
CloseIoCompletionPort returned successfully.
The common language runtime (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.
An invalid port handle was passed.
hPort must be a handle to a port that was created by an earlier call to CreateIoCompletionPort.
Platforms: See .NET Framework System Requirements.
Library: Included as a resource in MSCorEE.dll
.NET Framework Versions: 4.6, 4.5.2, 4.5.1, 4.5, 4, 3.5 SP1, 3.5, 3.0 SP1, 3.0, 2.0 SP1, 2.0