Interop\Async\Loop::enable PHP Method

    public static function enable($watcherId)
    {
        $driver = self::$driver ?: self::get();
        $driver->enable($watcherId);
    }

 public function write(string $bytes) : Awaitable
 {
     if ($bytes === '') {
         if (!\is_resource($this->socket)) {
             return new Failure(new StreamClosedException('Socket resource unavailable'));
         }
         return new Success(0);
     }
     $len = \strlen($bytes);
     if (!$this->writerEnabled) {
         try {
             $bytes = $this->writeBytes($bytes);
         } catch (\Throwable $e) {
             return new Failure($e);
         }
         if ($bytes === '') {
             return new Success($len);
         }
         $this->writerEnabled = true;
         if ($this->pendingWrites === null) {
             $this->pendingWrites = new \SplQueue();
         }
         if ($this->writeWatcher === null) {
             $this->writeWatcher = Loop::onWritable($this->socket, $this->createWriteWatcher());
         } else {
             try {
                 Loop::enable($this->writeWatcher);
             } catch (InvalidWatcherException $e) {
                 $this->writeWatcher = Loop::onWritable($this->socket, $this->createWriteWatcher());
             }
         }
         if (!$this->writerReferenced) {
             Loop::unreference($this->writeWatcher);
         }
     }
     $this->pendingWrites->enqueue($write = new PendingWrite($bytes, $len, function () {
         foreach ($this->pendingWrites as $write) {
             if (!$write->disabled) {
                 return;
             }
         }
         $this->writerEnabled = false;
         Loop::disable($this->writeWatcher);
     }));
     return $write;
 }