The EvCheck class

(PECL ev >= 0.2.0)

Introduction

EvPrepare and EvCheck watchers are usually used in pairs. EvPrepare watchers get invoked before the process blocks, EvCheck afterwards.

It is not allowed to call EvLoop::run() or similar methods or functions that enter the current event loop from either EvPrepare or EvCheck watchers. Other loops than the current one are fine, however. The rationale behind this is that one don't need to check for recursion in those watchers, i.e. the sequence will always be: EvPrepare -> blocking -> EvCheck, so having a watcher of each kind they will always be called in pairs bracketing the blocking call.

The main purpose is to integrate other event mechanisms into libev and their use is somewhat advanced. They could be used, for example, to track variable changes, implement custom watchers, integrate net-snmp or a coroutine library and lots more. They are also occasionally useful to cache some data and want to flush it before blocking.

It is recommended to give EvCheck watchers highest( Ev::MAXPRI) priority, to ensure that they are being run before any other watchers after the poll (this doesn’t matter for EvPrepare watchers).

Also, EvCheck watchers should not activate/feed events. While libev fully supports this, they might get executed before other EvCheck watchers did their job.

Class synopsis

class EvCheck extends EvWatcher {

/* Inherited properties */

public $is_active;

public $data;

public $is_pending;

public $priority;

/* Methods */

public function __construct( callable $callback , mixed $data = ?, int $priority = ?)

final public static function createStopped( string $callback , string $data = ?, string $priority = ?): object

/* Inherited methods */

public function EvWatcher::clear(): int

public function EvWatcher::feed( int $revents ): void

public function EvWatcher::getLoop(): EvLoop

public function EvWatcher::invoke( int $revents ): void

public function EvWatcher::keepalive( bool $value = ?): bool

public function EvWatcher::setCallback( callable $callback ): void

public function EvWatcher::start(): void

public function EvWatcher::stop(): void

}

EvCheck::__construct — Constructs the EvCheck watcher object
EvCheck::createStopped — Create instance of a stopped EvCheck watcher

The EvCheck class

Introduction

Class synopsis

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