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.NET Forum / Languages / Managed C++ / October 2007AddRef and Release function of COM inteface
Hello everyone, I have noticed a lot of COM samples that the function AddRef and Release function of COM inteface is not synchronized to make it thread safe when dealing with adding/decreasing reference count. Is it needed to synchronize AddRef and Release? Or the COM runtime underlying implementation handles thread safe issue by itself (i.e. transparent to upper layer COM server developer) I am using Visual Studio 2005 to develop native (unmanaged C++) COM. No other framework is used (e.g. ATL). thanks in advance, George > Is it needed to synchronize AddRef and Release? Or the COM runtime Yes. Why and how are described in Don Box's Essential COM (p. 53) Thanks Crest, I want to confirm with you that you mean we need to add thread safe synchronization approach to AddRef and Release to make counter value thread safe manually by developers (i.e. COM runtime engine does not provide such function)? regards, George > > Is it needed to synchronize AddRef and Release? Or the COM runtime > > Yes. > Why and how are described in Don Box's Essential COM (p. 53) > Thanks Crest, > > I want to confirm with you that you mean we need to add thread safe > synchronization approach to AddRef and Release to make counter value > thread safe manually by developers (i.e. COM runtime engine does not > provide such function)? Yes, that's correct. AddRef/Release are typically implemented using InterlockedIncrement and InterlockedDecrement. -cd Thanks for all of your help, cd! regards, George > > Thanks Crest, > > [quoted text clipped - 7 lines] > > -cd > Thanks Crest, > [quoted text clipped - 3 lines] > safe manually by developers (i.e. COM runtime engine does not provide such > function)? *If* you mark your component with the single-threaded or apartment threading model then you needn't worry. Other threading models need to use InterlockedXYZ functions as Carl mentioned. > regards, > George [quoted text clipped - 3 lines] >> Yes. >> Why and how are described in Don Box's Essential COM (p. 53) Hi Ben, I am interested to learn the basics of apartment thread model. Could you recommend some learning materials? regards, George > > Thanks Crest, > > [quoted text clipped - 17 lines] > >> Yes. > >> Why and how are described in Don Box's Essential COM (p. 53) http://www.codeproject.com/com/#COM  SignatureThanks & Regards, Alex. > Hi Ben, > [quoted text clipped - 25 lines] > > >> Yes. > > >> Why and how are described in Don Box's Essential COM (p. 53) http://www.codeproject.com/com/#COM SignatureThanks & Regards, Alex. > Hi Ben, > [quoted text clipped - 25 lines] > > >> Yes. > > >> Why and how are described in Don Box's Essential COM (p. 53) Thanks Alex, regards, George > http://www.codeproject.com/com/#COM > [quoted text clipped - 27 lines] > > > >> Yes. > > > >> Why and how are described in Don Box's Essential COM (p. 53) Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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