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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
);

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 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

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

See Also

Reference

ICLRTask Interface
ICLRTaskManager Interface
IHostTask Interface
IHostTaskManager Interface