message: Check coroutine first.
diff: @@ -1387,8 +1387,8 @@ PHP_FUNCTION(swoole_coroutine_exec)
  RETURN_FALSE;
  }
  + Coroutine::get_current_safe();
  swoole_coroutine_signal_init();
  - php_swoole_check_reactor();
  pid_t pid;
  int fd = swoole_shell_exec(command, &pid, get_error_stream);
  