I am presuming that you are referring to the independent threads that manage the print_manager and the thread_timer aspect of the program. Yes, those threads are outside of the pool and are started near the top of MAIN. 
  my $thr_pm    = threads->create( \&print_manager )->detach();
  my $thr_tm    = threads->create( \&thread_timer )->detach();

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However, the worker aspect of the program operates from a pool of threads, which are reused and defined by: 
  for ( 1..$DEFAULTS->{'max_threads'} ) {
    my $q_work = Thread::Queue->new();
    my $thr = threads->create( \&thread_worker, $q_work );
    $work_queues{$thr->tid()} = $q_work;
  } ## end for max_threads.

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I am expecting the ':locked' attribute to ensure that no other thread, intentional or otherwise, will access the subroutine while the active thread has control. Do you read otherwise? If so, how?

In reply to Re^2: RFC: Using 'threads' common aspects by DeadPoet
in thread RFC: Using 'threads' common aspects by DeadPoet

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