threading (C++)
Specifies the threading model for a COM object.
[ threading(
model=enumeration
) ]
Parameters
model(optional)
One of the following threading models:apartment (apartment threading)
neutral (.NET Framework components with no user interface)
single (simple threading)
free (free threading)
both (apartment and free threading)
The default value is apartment.
Remarks
The threading C++ attribute does not appear in the generated .idl file but will be used in the implementation of your COM object.
In ATL projects, If the coclass attribute is also present, the threading model specified by model is passed as the template parameter to the CComObjectRootEx class, inserted by the coclass attribute.
The threading attribute also guards access to an event_source.
Example
See the licensed example for a sample use of threading.
Requirements
Attribute Context
Applies to |
class, struct |
Repeatable |
No |
Required attributes |
coclass |
Invalid attributes |
None |
For more information about the attribute contexts, see Attribute Contexts.
See Also
Reference
Concepts
Multithreading Support for Older Code (Visual C++)