evio(3) [php man page]

EVIO(3) 								 1								   EVIO(3)

The EvIo class

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

       EvIoextends
       EvWatcher

       Properties

       o public$fd

       o public$events

       Inherited properties

       o public$is_active

       o public$data

       o public$is_pending

       o public$priority

       Methods

       o public EvIo::__construct (mixed  $fd, int  $events, callable  $callback, [mixed  $data], [int	$priority])

       o finalpublicstatic EvIo EvIo::createStopped NULL (mixed  $fd, int  $events, callable  $callback, [mixed  $data], [int  $priority])

       o public void EvIo::set (mixed  $fd, int  $events)

       Inherited methods

       o public int EvWatcher::clear (void  )

       o abstractpublic EvWatcher::__construct (void  )

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

       o public EvLoop EvWatcher::getLoop (void  )

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

       o public bool EvWatcher::keepalive ([bool  $value])

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

       o public void EvWatcher::start (void  )

       o public void EvWatcher::stop (void  )

PROPERTIES

	      o $fd
		-

	      o $events
		-

PHP Documentation Group 														   EVIO(3)

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EVCHILD(3)								 1								EVCHILD(3)

The EvChild class

INTRODUCTION

       EvChild	watchers trigger when the process receives a SIGCHLD in response to some child status changes (most typically when a child dies or
       exits). It is permissible to install an EvChild watcher after the child has been forked(which implies it might  have  already  exited),	as
       long as the event loop isn't entered(or is continued from a watcher), i.e. forking and then immediately registering a watcher for the child
       is fine, but forking and registering a watcher a few event loop iterations later or in the next callback invocation is not.

	It is allowed to register EvChild watchers in the default loop only.

CLASS SYNOPSIS

       EvChild

       EvChildextends
       EvWatcher

       Properties

       o public$pid

       o public$rpid

       o public$rstatus

       Inherited properties

       o public$is_active

       o public$data

       o public$is_pending

       o public$priority

       Methods

       o public EvChild::__construct NULL (int	$pid, bool  $trace, callable  $callback, [mixed  $data], [int  $priority])

       o finalpublicstatic object EvChild::createStopped (int  $pid, bool  $trace, callable  $callback, [mixed	$data], [int  $priority])

       o public void EvChild::set (int	$pid, bool  $trace)

       Inherited methods

       o public int EvWatcher::clear (void  )

       o abstractpublic EvWatcher::__construct (void  )

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

       o public EvLoop EvWatcher::getLoop (void  )

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

       o public bool EvWatcher::keepalive ([bool  $value])

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

       o public void EvWatcher::start (void  )

       o public void EvWatcher::stop (void  )

PROPERTIES

	      o $pid
		- Readonly . The process ID this watcher watches out for, or 0 , meaning any process ID.

	      o $rpid
		- Readonly .The process ID that detected a status change.

	      o $rstatus
		- Readonly . The process exit status caused by $rpid .

PHP Documentation Group 														EVCHILD(3)

Linux and UNIX Man Pages

evio(3) [php man page]

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