Here is the idea of what can happen: 
STEP 1: Wait for the first lock to be lost.
STEP 2: Lose the first lock
STEP 3: (Why don't we get here?)...

[download]
This state of affairs is known as a "deadlock" and is usually considered Not Good.

In reply to Re (tilly) 3: Filename from filehandle? by tilly
in thread Filename from filehandle? by Anonymous Monk

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