EvIdle::createStopped
EvIo::__construct
Ev
PHP Manual

# The EvIo class

(PECL ev >= 0.2.0)

## Introduction

EvIo watchers check whether a file descriptor(or socket, or a stream castable to numeric file descriptor) is readable or writable in each iteration of the event loop, or, more precisely, when reading would not block the process and writing would at least be able to write some data. This behaviour is called level-triggering because events are kept receiving as long as the condition persists. To stop receiving events just stop the watcher.

The number of read and/or write event watchers per `fd` is unlimited. Setting all file descriptors to non-blocking mode is also usually a good idea(but not required).

Another thing to watch out for is that it is quite easy to receive false readiness notifications, i.e. the callback might be called with `Ev::READ` but a subsequent read() will actually block because there is no data. It is very easy to get into this situation. Thus it is best to always use non-blocking I/O: An extra read() returning `EAGAIN` (or similar) is far preferable to a program hanging until some data arrives.

If for some reason it is impossible to run the `fd` in non-blocking mode, then separately re-test whether a file descriptor is really ready. Some people additionally use `SIGALRM` and an interval timer, just to be sure thry won't block infinitely.

Always consider using non-blocking mode.

## Class synopsis

EvIo extends EvWatcher {
/* Properties */
public $fd ;
public $events ;
/* Inherited properties */
public $is_active ;
public $data ;
public $is_pending ;
public $priority ;
/* Methods */
public __construct ( mixed `$fd` , int `$events` , callable `$callback` [, mixed `$data` [, int `$priority` ]] )
final public static EvIo createStopped ( mixed `$fd` , int `$events` , callable `$callback` [, mixed `$data` = `NULL` [, int `$priority` = 0 ]] )
public void set ( mixed `$fd` , int `$events` )
/* Inherited methods */
public int EvWatcher::clear ( void )
abstract public EvWatcher::__construct ( void )
public void EvWatcher::feed ( int `$revents` )
public EvLoop EvWatcher::getLoop ( void )
public void EvWatcher::invoke ( int `$revents` )
public bool EvWatcher::keepalive ([ bool `$value` ] )
public void EvWatcher::setCallback ( callable `$callback` )
public void EvWatcher::start ( void )
public void EvWatcher::stop ( void )
}

## Properties

fd

events

## Table of Contents

- EvIo::__construct — Constructs EvIo watcher object
- EvIo::createStopped — Create stopped EvIo watcher object
- EvIo::set — Configures the watcher

EvIdle::createStopped
EvIo::__construct
Ev
PHP Manual