IHostTaskManager::LeaveRuntime Method

Notifies the host that the currently executing task is about to leave the common language runtime (CLR) and enter unmanaged code.

Important

A corresponding call to IHostTaskManager::EnterRuntime Method notifies the host that the currently executing task is reentering managed code.

HRESULT LeaveRuntime (
    [in] SIZE_T target
);

target
[in] The address within the mapped portable executable file of the unmanaged function to be called.

Return Value

HRESULT	Description
S_OK	LeaveRuntime 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.
E_OUTOFMEMORY	Not enough memory is available to complete the requested allocation.

Call sequences to and from unmanaged code can be nested. For example, the list below describes a hypothetical situation in which the sequence of calls to LeaveRuntime, IHostTaskManager::ReverseEnterRuntime Method, IHostTaskManager::ReverseLeaveRuntime Method, and IHostTaskManager::EnterRuntime Method allows the host to identify the nested layers.

Action	Corresponding Method Call
A managed Visual Basic executable calls an unmanaged function written in C by using platform invoke.	IHostTaskManager::LeaveRuntime
The unmanaged C function calls a method in a managed DLL written in C#.	IHostTaskManager::ReverseEnterRuntime
The managed C# function calls another unmanaged function written in C, also using platform invoke.	IHostTaskManager::LeaveRuntime
The second unmanaged function returns execution to the C# function.	IHostTaskManager::EnterRuntime
The C# function returns execution to the first unmanaged function.	IHostTaskManager::ReverseLeaveRuntime
The first unmanaged function returns execution to the Visual Basic program.	IHostTaskManager::EnterRuntime

Platforms: Windows 2000, Windows XP, Windows Server 2003 family

Header: MSCorEE.idl

Library: Included as a resource in MSCorEE.dll

.NET Framework Version: 2.0