I grabbed ikegami's code and ran it against perls 5.8.8, 5.10.1, 5.16.1, 5.18.1, and 5.22.1 on Linux/amd64, and it spat out huge amounts of data for each one. So, if you're only getting a single line of output, I have to wonder what's so different in your environment as to break this. However, that it works here indicates that the locking isn't a problem by itself.

In reply to Re^4: Threads sharing global variable by Tanktalus
in thread Threads sharing global variable by Anonymous Monk

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