In that case, you don't even need a queue. To restate your description of the process:
While subA detects faults, use subB to correct them.
Translating this to Perl is trivial: 
while (subA(@array)) {
  subB(@array);
}

[download]
or 
while (my @faults = subA(@array)) {
  subB(\@array, \@faults);
}

[download]
if subB needs to know what the list of faults was.

In reply to Re^2: Recursive loops by dsheroh
in thread Recursive loops by reaper9187

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