threading (C++)

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01/03/2018

The latest version of this topic can be found at threading (C++).

Specifies the threading model for a COM object.

Syntax

  
      [ 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.

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