The EvWatcher class

    (PECL ev >= 0.2.0)

    简介

    EvWatcher is a base class for all watchers( EvCheck, EvChild etc.). Since EvWatcher 's constructor is abstract, one can't(and don't need to) create EvWatcher objects directly.

    类摘要

    abstract class EvWatcher {
    /* 属性 */
    public $is_active;
    public $data;
    public $is_pending;
    public $priority;
    /* 方法 */
    abstract public function __construct()
    public function clear(): int
    public function feed( int $revents ): void
    public function getLoop(): EvLoop
    public function invoke( int $revents ): void
    public function keepalive( bool $value = ?): bool
    public function setCallback( callable $callback ): void
    public function start(): void
    public function stop(): void
    }

    属性

    is_active
    Readonly. true if the watcher is active. false otherwise.
    data
    User custom data associated with the watcher
    is_pending
    Readonly .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.
    priority
    int between Ev::MINPRI and 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.

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