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use strict;
use warnings;
...

   waitpid( $pid, 0 );
}

use strict;
use warnings;
...

   waitpid( $pid, 0 );
}

use strict;
use warnings;
...

   waitpid( $pid, 0 );
}

# Locking is necessary via the TIE interface.
# Below, set and get are called separately behind the scene ( 2 IPC st
+atements ).
...

my $a3 = MCE::Shared->array();
my $v3 = $a3->[0] = "item3";