Figure 3-4 STAs and MTA inside one process in VS .NET

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Figure 3-4 STAs and MTA inside one process
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A thread switch always occurs when crossing an STA or an MTA A thread switch also means some overhead with invoking methods of objects that live in a different apartment To reduce this overhead, a COM object can also specify the registry entry THReadingModel=Both, which means the object can live either in an STA or an MTA The apartment will be selected on the thread that is creating the objectthe apartment will be the same apartment the thread is running in
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MTA Thread Pool
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Enterprise Services applications also have a pool of MTA threads Unlike the STA pool, the MTA pool has no boundary and can grow dynamically when more MTA threads are needed There is just one MTA inside a process, but in this MTA, the number of threads can grow as needed
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Thread-Neutral Apartments
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Starting with Windows 2000, a new apartment type was introduced: the thread- neutral apartment (TNA)
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NOTE: Different Names for the TNA
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For some time, the apartment was called neutral threaded apartment (NTA), but being so different from the other apartments, it was renamed to thread-neutral apartment (TNA) To make the naming more complex, it is sometimes referred to as neutral apartment (NA) You will find all three terms in the MSDN documentation; but NTA, TNA, and NA concerning multithreading and apartments all mean the same In this book, I am sticking to the term TNA
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Contrary to the other apartment types, the TNA is only available for objects configured with COM+ Services STA and MTA apartments are also available for COM objects that are not registered as serviced components Similar to the other apartments, the COM object specifies that it wants to live in a TNA This is done with the registry entry ThreadingModel=Neutral The registry configuration ThreadingModel=Both means that the object can live either in an STA, MTA, or TNA Now the configuration Both means one of three This might sound silly; however, the reason for this name derives from the history when Both was really just one of two: STA or MTA The main difference from the TNA to the other apartments is that a thread never specifies to enter a TNA Instead, the thread enters the apartment during the method call and leaves it when the method call is finished This has a big performance advantage, because a thread switch does not occur for entering a TNA; just some variables for the apartment context are changed Saying that a thread lives either in an STA or an MTA, it is valid to say that a thread just visits a TNA What about thread-safe access to COM objects living in a TNA This is an important aspect with this apartment type: The synchronization feature moved out from the apartment to the COM+ activity With the help of an activity, it can be guaranteed that only one thread accesses an object within a TNA at the same time The difference from STA is that with single-threaded apartments, it is always the same thread accessing the object, but with TNA, it can be a different one
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Why Are STAs Still in Use Today
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Nowadays, the STA model is only needed for objects that have a thread-affinity (for example, if a user interface element is accessed; window handles do have thread affinity) With COM+ Services or NET Enterprise Services, the preferred apartment type is TNA In case you are using serviced components directly on the client system as a library application where user interface elements are accessed, STA is the option to use
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Now you have learned quite a lot about the history of COM apartments and are ready to step into the NET Enterprise Services-specific features
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