ICLRTask::SwitchIn Method

Notifies the common language runtime (CLR) that the task that the current ICLRTask instance represents is now in an operable state.


HRESULT SwitchIn (  
    [in] HANDLE threadHandle  


[in] A handle to the physical thread on which the task represented by the current ICLRTask instance is executing.

Return Value

HRESULT Description
S_OK SwitchIn 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.
HOST_E_INVALIDOPERATION SwitchIn was called without an earlier call to SwitchOut Method.


The threadHandle parameter represents a handle to the operating system thread on which the task represented by the current ICLRTask instance has been scheduled. If impersonation has occurred on this thread, you must call IHostSecurityManager::RevertToSelf before switching in the task.


A call to SwitchIn without an earlier call to SwitchOut fails with an HRESULT value of HOST_E_INVALIDOPERATION.


Platforms: See System Requirements.

Header: MSCorEE.h

Library: Included as a resource in MSCorEE.dll

.NET Framework Versions: Available since 2.0

See Also

ICLRTask Interface
ICLRTaskManager Interface
IHostTask Interface
IHostTaskManager Interface