Hi everyone,
Thank you very much for your help on my previous Exception threadsafety
question!
Another threadsafe problem just poped in my mind.
The TInterfacedObject provides default referencing couting support, which
uses Interlocked_ operations that seems to be threadsafe. However, I think
there still is a race condition in the following scenario:
0. An interface, "IntfA", implemented by a TInterfacedObject descendant has
refcount 1;
1. A thread, "threadA", makes another reference to 'IntfA', however, the
execution is interrupted just before the InterlockedIncrement() in _AddRef;
2. Another thread dereferences "IntfA", the instance's refcount drops to 0
and is destroyed.
3. Execution of "threadA" resumes, but the instance is no longer there!
I think I am being paranoid again, and please tell me yes! (otherwise life
is going to be very miserable...)
AdamWu
----
.dlrow eht htiw thgir s'lla ,nevaeh sih ni si doG
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