(PECL ev >= 0.2.0)
TRUE if the watcher is active.
User custom data associated with the watcher
TRUE if the watcher is pending, i.e. it has outstanding events, but its callback has not yet been invoked.
FALSE otherwise. As long, as a watcher is pending(but not active), one must not change its priority.
Ev::MAXPRI . Pending watchers with higher priority will be invoked before watchers with lower priority, but priority will not keep watchers from being executed(except for EvIdle watchers). EvIdle watchers provide functionality to suppress invocation when higher priority events are pending.