I'm running a vb.net application that calls a dll written in unmanaged c++, and wondering about the effects of Garbage Collection on the program. As far as I know, garbage collection is pretty much taken care of for the .net application. But I'm worried about the resources that were allocated by the dll. I think I've handled all possible memory leaks in the dll (using boost smart pointers), but I am not 100% sure.
My question is 1) If I'm calling a function for a dll, do the resources used by the dll get deleted when I return from the dll to the .net application? If not, then 2) would it make sense to call Garbage Collection after I'm done using the dll?
This is important because the vb.net application and the dll work fine by themselves, or together when they have to process small amounts of data, but I'm getting performance issues as I scale up the size of the information being passed to them.
7  2219 
I'm not sure garbagecollection (GC.Collect()) even applys to unmanaged code at all.
I *think* you need to be sure to free any memory used manually.
I'm not sure garbagecollection (GC.Collect()) even applys to unmanaged code at all.
I *think* you need to be sure to free any memory used manually.
Yes, but I'm not calling garbage collection in the dll. I'd be calling it in the .net application after I'm finished using the dll. I want to know if functions called from a dll are considered out of scope when I return to the .net application, and any memory they might have use will be deleted.
Do you mean that the Garbage Collector might not even recognize the memory set aside for the unmanaged code resources as something it needs to manage?
Do you mean that the Garbage Collector might not even recognize the memory set aside for the unmanaged code resources as something it needs to manage?
Yes. It was my understanding that that is what unmanaged code IS, not handled by the CLR so not able to have GC collect it.
Yes. It was my understanding that that is what unmanaged code IS, not handled by the CLR so not able to have GC collect it.
Yes, I can see that. I thought the GC might play a role since the dll is called as a function from the .net application.
I mean it might, I don't have the defacto answer on that, but I would suggest you do your best to free up the memory with your own code.
Understood. Thanks for the input.
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