I'm not able to understand your code, but just glancing at the code you have used undef on your shared array @Data numerous times. 
#for instance you have

 # Manage the thread pool until signalled to terminate
    while (! $TERM) {
    my $t;
    undef @Data;
#################################
# and
undef @Data; # Clear the shared array so that it can be used a
+gain for the next for target

[download]
Are you sure that undef'ing a shared array is a correct way of clearing out the array? I might think you would use lock on @Data, and then do @Data = ();

That brings up locking shared variables, your symptoms are similar to those where unlocked shared variables get clobbered by other threads accessing @Data.

See Threads: why locking is required when using shared variables

In reply to Re: Shared Thread Pool (used more then once,) by zentara
in thread Shared Thread Pool (used more then once,) by tnttinxses

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