what does HANDLE(RefCnt) mean in windbg?

The following is my checking gcroot of the object 0330e9a8. I found Its root is a hanle with its type is "RefCnt".

How could I get the actual reference count of it. And How could I know WHICH object obtained its reference?

0:042> !GCRoot 0330e9a8 Note: Roots found on stacks may be false positives. Run "!help gcroot" for more info. Scan Thread 5 OSTHread 534 Scan Thread 8 OSTHread 60c Scan Thread 9 OSTHread 1120 Scan Thread 10 OSTHread 1b30 Scan Thread 11 OSTHread 52c Scan Thread 12 OSTHread 1da8 Scan Thread 15 OSTHread 1cbc Scan Thread 19 OSTHread 1808 Scan Thread 22 OSTHread 1b6c Scan Thread 23 OSTHread 1e70 Scan Thread 0 OSTHread 1a34 Scan Thread 32 OSTHread 1840 DOMAIN(001C1050):HANDLE(RefCnt):d31460:Root:0330edf8(xxxxxxx)-> 0330eedc(xxxxxxxxxxxx)-> 0330e9a8(xxxxxxxxxxxxxx)

-------------Problems Reply------------

It's a GC handle that keeps .NET objects reachable for unmanaged code.
for example: subscribing to COM object event.

What types of roots would you normally see when running !gcroot and what do they mean?
ESP: ESP=Extended Stack Pointer, Object is in use on a stack
Strong: Strong reference, Typically a static variable
WeakLn: Weak Long Handle, A weak reference that is tracked through finalization (can be resurrected)
WeakSh: Weak Short Handle, A weak reference, can't be resurrected
Pinned: Pinned object, pinned at a specific address, can't move around during garbage collection.
RefCnt: Reference count, referenced as long as the reference count is > 0.

See: .NET Debugging Demos Lab 7: Memory Leak - Review

Category:clr Views:2 Time:2011-07-13
Tags: clr windbg sos

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