The EvCheck class

(PECL ev >= 0.2.0)

锟斤拷锟�

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.

锟斤拷摘要

EvCheck extends EvWatcher {
/* 锟教承碉拷锟斤拷锟斤拷 */
public $is_active ;
public $data ;
public $is_pending ;
public $priority ;
/* 锟斤拷锟斤拷 */
public __construct ( callable $callback [, mixed $data [, int $priority ]] )
final public static createStopped ( string $callback [, string $data [, string $priority ]] ) : object
/* 锟教承的凤拷锟斤拷 */
public EvWatcher::clear ( void ) : int
abstract public EvWatcher::__construct ( void )
public EvWatcher::feed ( int $revents ) : void
public EvWatcher::getLoop ( void ) : EvLoop
public EvWatcher::invoke ( int $revents ) : void
public EvWatcher::keepalive ([ bool $value ] ) : bool
public EvWatcher::setCallback ( callable $callback ) : void
public EvWatcher::start ( void ) : void
public EvWatcher::stop ( void ) : void
}

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