Explain COM Threading models?
COM terminology to threads is slightly different. There are three types of threading models in COM. They are apartment threading, free threading and rental threading ( introduced for MTS ) The closest analogy to Win32 is that UI threads are analogically similar to the Apartment threading model and worker threads are analogically similar to the Free threading model. Apartment Threading Model (single threaded apartments) This model was introduced in the first version of COM with Windows NT3.51 and later Windows 95. The apartment model consists of a multithreaded process that contains only one COM object per thread. Single Threaded Apartments (STA)- This also means that each thread can be called an apartment and each apartment is single threaded. All calls are passed through the Win32 message processing system. COM ensures that these calls are synchronized. Each thread has its own apartment or execution context and at any point in time, only one thread can access this apartment. Each thre
