Several methods in Queue.Queue have warnings in their doc strings that they are not reliable (e.g., qsize). I note that the code in all these methods is bracketed with lock acquire/release. These locks are intended to protect the enclosed code from collisions with other threads. I am wondering whether I understand correctly that the reason these methods are still not reliable is that from the point where a thread calls qsize (for example) to the point in Queue where a thread acquires a lock there is a bunch of code, none of which is protected by a lock, (and moreover there is another bunch of code between the point where a thread releases a lock and then actually returns to the calling program) and so despite the locks in Queue it is still possible for values to change before a thread acts on them. -- Jeffrey Barish
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