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in reply to Shared variable not changing?
You are hiding the shared queue, because you have a my @queue in your code.
Additionally there is no lock statement anywhere, thus this will never ever be thread-safe.
If you want to extent Thread::Queue, you should first read the thread tutorial and look at the implementation of Thread::Queue in the lib directory.
I would suggest that you copy the enqueue code into a new function and change it to work inside the queue. The implementation of the Thread::Queue shows you the difficulty of working with threads in a safe way...
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