(PECL event >= 2.0.2-alpha)
EventConfig::setFlags — Sets one or more flags to configure the eventual EventBase will be initialized
$flags
   ): boolSets one or more flags to configure what parts of the eventual EventBase will be initialized, and how they'll work.
flags
    
      One of EventBase::LOOP_* constants. 
      See EventBase constants.
     
   Returns true on success or false on failure.