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I have a silly question. If I have an array in C++, that I am using to store a number of references (I’m guessing IntPtrs, haven’t gotten that far yet) to various C# objects, how does the GC in C# know not to collect these objects? I mean, the mark and sweep algorithm can’t see into the unmanaged code structure, right? So, if the only reference to these C# objects is inside this structure, would I not have to do something extra to tell the GC not to collect them?
Yes you would have to take special care to ensure not only your objects are kept alive and safe from GC but that they haven’t been moved around by GC.
Take a look at:
http://dotnet.dzone.com/news/net-memory-control-use-gchandl