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use strict;
use warnings;
...
$start_sem->up( NUM_THREADS );

$_->join for @t;

first, 0 0.634
first, 2 0.639
...
next,  1 0.732
next,  3 0.732
next,  2 0.732

use strict;
use warnings;
...
$start_sem->up( NUM_THREADS );

$_->join for @t;

first, 1 0.698
first, 2 0.702
...
next,  1 0.757
next,  0 0.757
next,  2 0.757

use strict;
use warnings;
...
$barrier1->wait;

$_->join for @t;

first, 0 0.630
first, 1 0.630
...
next,  0 0.723
next,  1 0.723
next,  2 0.723