0) { echo "Father\n"; for ($i = 0; $i < $n; $i++) { $data = str_repeat('A', rand(100, 200)); if ($chan->push($data) === false) { echo "channel full\n"; usleep(1000); $i--; continue; } $bytes += strlen($data); // echo "#$i\tpush ".strlen($data)." bytes\n"; } echo "total push bytes: $bytes\n"; var_dump($chan->stats()); } else { echo "Child\n"; for ($i = 0; $i < $n; $i++) { $data = $chan->pop(); if ($data === false) { echo "channel empty\n"; usleep(1000); $i--; continue; } $bytes += strlen($data); // echo "#$i\tpop " . strlen($data) . " bytes\n"; } echo "total pop bytes: $bytes\n"; var_dump($chan->stats()); }