my @threads = map {
    ## create the workers passing the log file handle and semaphore
    threads->create( \&worker, $log, \$logSem,$_*$N, $_*$N + $N -1);
} 0 .. 5; ## 5 threads each processing 100 "files"
[download]

...<hem>that's 6 threads, shirly ?

To process $from..$to in $t threads, how about:

my @threads = map{
  threads->create( \&worker, $log, \$logSem, $from + ($_ - 1), $t, $to
+) ;
} 1 .. $t ;
[download]

and in the thread:

  my( $log, $semRef, $from, $step, $to ) = @_;
  for (my $file = $from ; $file <= $to ; $file += $step) {
  ......
  } ;
[download]

which deals with the number of files not being an exact multiple of the number of threads, and copes with $from..$to range where $from is not zero and $to is included in the range...

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