public function killChildren(): void
    {
        if (!$this->childPID && !$this->watchdogPID) {
            return;
        }

        $this->childKill();
        $this->watchdogKill();
    }
public function killChildren(): void
    {
        if (!$this->childPID && !$this->watchdogPID) {
            return;
        }

        $this->childKill();
        $this->watchdogKill();
    }
{@inheritdoc}

@return void