The Event class

(PECL event >= 1.2.6-beta)

简介

Event class represents and event firing on a file descriptor being ready to read from or write to; a file descriptor becoming ready to read from or write to(edge-triggered I/O only); a timeout expiring; a signal occurring; a user-triggered event.

Every event is associated with EventBase . However, event will never fire until it is added (via Event::add() ). An added event remains in pending state until the registered event occurs, thus turning it to active state. To handle events user may register a callback which is called when event becomes active. If event is configured persistent , it remains pending. If it is not persistent, it stops being pending when it's callback runs. Event::del() method deletes event, thus making it non-pending. By means of Event::add() method it could be added again.

类摘要

final Event {

/* Constants */

const int ET = 32 ;

const int PERSIST = 16 ;

const int READ = 2 ;

const int WRITE = 4 ;

const int SIGNAL = 8 ;

const int TIMEOUT = 1 ;

/* 属性 */

public readonly bool $pending ;

/* 方法 */

public add ( float $timeout = ? ) : bool

public addSignal ( float $timeout = ? ) : bool

public addTimer ( float $timeout = ? ) : bool

public __construct ( EventBase $base , mixed $fd , int $what , callable $cb , mixed $arg = NULL )

public del ( ) : bool

public delSignal ( ) : bool

public delTimer ( ) : bool

public free ( ) : void

public static getSupportedMethods ( ) : array

public pending ( int $flags ) : bool

public set ( EventBase $base , mixed $fd , int $what = ? , callable $cb = ? , mixed $arg = ? ) : bool

public setPriority ( int $priority ) : bool

public setTimer ( EventBase $base , callable $cb , mixed $arg = ? ) : bool

public static signal ( EventBase $base , int $signum , callable $cb , mixed $arg = ? ) : Event

public static timer ( EventBase $base , callable $cb , mixed $arg = ? ) : Event

}

属性

pending: Whether event is pending. See About event persistence .

预定义常量

Event::ET

Indicates that the event should be edge-triggered, if the underlying event base backend supports edge-triggered events. This affects the semantics of Event::READ and Event::WRITE .

Event::PERSIST

Indicates that the event is persistent. See About event persistence .

Event::READ

This flag indicates an event that becomes active when the provided file descriptor(usually a stream resource, or socket) is ready for reading.

Event::WRITE

This flag indicates an event that becomes active when the provided file descriptor(usually a stream resource, or socket) is ready for reading.

Event::SIGNAL

Used to implement signal detection. See "Constructing signal events" below.

Event::TIMEOUT

This flag indicates an event that becomes active after a timeout elapses.

The Event::TIMEOUT flag is ignored when constructing an event: one can either set a timeout when event is added , or not. It is set in the $what argument to the callback function when a timeout has occurred.

Event::add — Makes event pending
Event::addSignal — Makes signal event pending
Event::addTimer — Makes timer event pending
Event::__construct — Constructs Event object
Event::del — Makes event non-pending
Event::delSignal — Makes signal event non-pending
Event::delTimer — Makes timer event non-pending
Event::free — Make event non-pending and free resources allocated for this event
Event::getSupportedMethods — Returns array with of the names of the methods supported in this version of Libevent
Event::pending — Detects whether event is pending or scheduled
Event::set — Re-configures event
Event::setPriority — Set event priority
Event::setTimer — Re-configures timer event
Event::signal — Constructs signal event object
Event::timer — Constructs timer event object

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The Event class

简介

类摘要

属性

预定义常量

Table of Contents

User Contributed Notes