IHostSyncManager::CreateMonitorEvent Method

Creates a monitored auto-reset event object.


HRESULT CreateMonitorEvent (  
    [in]  SIZE_T cookie,  
    [out] IHostAutoEvent **ppEvent  


[in] A cookie to associate with the event object.

[out] A pointer to the address of an IHostAutoEvent instance, or null if the event object could not be created.

Return Value

HRESULT Description
S_OK CreateMonitorEvent returned successfully.
HOST_E_CLRNOTAVAILABLE The common language runtime (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 was available to create the requested event object.


CreateMonitorEvent returns an IHostAutoEvent that the CLR uses in its implementation of the managed System.Threading.Monitor type. This method mirrors the Win32 CreateEvent function, with a value of false specified for the bManualReset parameter.

The host can use the cookie to determine which task is waiting on the monitor by calling the ICLRSyncManager::GetMonitorOwner method.


Platforms: See System Requirements.

Header: MSCorEE.h

Library: Included as a resource in MSCorEE.dll

.NET Framework Versions: Available since 2.0

See also