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 notifies the host that the currently executing task is reentering managed code.
Syntax
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: See System Requirements.
Header: MSCorEE.h
Library: Included as a resource in MSCorEE.dll
.NET Framework Versions: Available since 2.0
