IHostTaskManager::LeaveRuntime Method
Notifies the host that the currently executing task is about to leave the common language runtime (CLR) and enter unmanaged code.
.gif "Important note") Important Note: |
|---|
A corresponding call to IHostTaskManager::EnterRuntime notifies the host that the currently executing task is reentering managed code. |
HRESULT LeaveRuntime (
[in] SIZE_T target
);
Parameters
- 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. |
Remarks
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, IHostTaskManager::ReverseLeaveRuntime, and IHostTaskManager::EnterRuntime 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 |
Requirements
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