message: Add worker num.
diff: @@ -6,8 +6,10 @@ enable_coroutine: enable_coroutine setting in server
  <?php
  require_once __DIR__ . '/../include/bootstrap.php';
  require_once __DIR__ . '/../include/lib/curl.php';
  +
  use Swoole\Http\Request;
  use Swoole\Http\Response;
  +
  $pm = new ProcessManager;
  $pm->parentFunc = function ($pid) {
  echo curlGet('http://127.0.0.1:9501/') . "\n";
  @@ -20,6 +22,7 @@ $pm->childFunc = function () use ($pm) {
  $http = new swoole_http_server('127.0.0.1', 9501);
  $http->set([
  'enable_coroutine' => false, // close build-in coroutine
  + 'worker_num' => 1,
  'log_level' => -1
  ]);
  $http->on("request", function (Request $request, Response $response) {
  