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 __construct()
    public clear(): int
    public feed( int $revents ): void
    public getLoop(): EvLoop
    public invoke( int $revents ): void
    public keepalive( bool $value = ?): bool
    public setCallback( callable $callback ): void
    public start(): void
    public 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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