evstat(3) [php man page]

EVSTAT(3)								 1								 EVSTAT(3)

The EvStat class

INTRODUCTION

       EvStat  monitors  a  file  system  path	for attribute changes. It calls stat() on that path in regular intervals(or when the OS signals it
       changed) and sees if it changed compared to the last time, invoking the callback if it did.

	The path does not need to exist: changing from "path exists" to "path does not exist" is a status change like  any  other.  The  condition
       "path does not exist" is signified by the 'nlink' item being 0(returned by EvStat::attr method).

	The  path must not end in a slash or contain special components such as '.' or .. . The path should be absolute: if it is relative and the
       working directory changes, then the behaviour is undefined.

	Since there is no portable change notification interface available, the portable implementation simply calls stat() regularly on the  path
       to  see	if  it	changed somehow. For this case a recommended polling interval can be specified. If one specifies a polling interval of 0.0
       (highly recommended) then a suitable, unspecified default value will be used(which could be expected to be around 5 seconds, although  this
       might change dynamically).  libev will also impose a minimum interval which is currently around 0.1 , but that's usually overkill.

	This  watcher  type  is  not  meant  for  massive  numbers of EvStat watchers, as even with OS-supported change notifications, this can be
       resource-intensive.

CLASS SYNOPSIS

       EvStat

       EvStatextends
       EvWatcher

       Properties

       o public$path

       o public$interval

       Inherited properties

       o public$is_active

       o public$data

       o public$is_pending

       o public$priority

       Methods

       o public array EvStat::attr (void  )

       o public EvStat::__construct NULL (string  $path, double  $interval, callable  $callback, [mixed  $data], [int  $priority])

       o finalpublicstatic void EvStat::createStopped NULL (string  $path, double  $interval, callable	$callback, [mixed  $data],  [int   $prior-
	 ity])

       o public void EvStat::prev (void  )

       o public void EvStat::set (string  $path, double  $interval)

       o public bool EvStat::stat (void  )

       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 $interval
		- Readonly . Hint on how quickly a change is expected to be detected and should normally be specified as 0.0 to let libev choose a
		suitable value.

	      o $path
		- Readonly . The path to wait for status changes on.

PHP Documentation Group 														 EVSTAT(3)

EVTIMER(3)								 1								EVTIMER(3)

The EvTimer class

INTRODUCTION

       EvTimer	watchers are simple relative timers that generate an event after a given time, and optionally repeating in regular intervals after
       that.

	The timers are based on real time, that is, if one registers an event that times out after an hour and resets the system clock to  January
       last  year  ,  it  will	still  time out after(roughly) one hour. "Roughly" because detecting time jumps is hard, and some inaccuracies are
       unavoidable.

	The callback is guaranteed to be invoked only after its timeout has passed (not at, so on systems with	very  low-resolution  clocks  this
       might  introduce  a small delay). If multiple timers become ready during the same loop iteration then the ones with earlier time-out values
       are invoked before ones of the same priority with later time-out values (but this is no longer  true  when  a  callback	calls  EvLoop::run
       recursively).

	The timer itself will do a best-effort at avoiding drift, that is, if a timer is configured to trigger every 10 seconds, then it will nor-
       mally trigger at exactly 10 second intervals. If, however, the script cannot keep up with the timer because it takes longer than  those	10
       seconds to do) the timer will not fire more than once per event loop iteration.

CLASS SYNOPSIS

       EvTimer

       EvTimerextends
       EvWatcher

       Properties

       o public$repeat

       o public$remaining

       Inherited properties

       o public$is_active

       o public$data

       o public$is_pending

       o public$priority

       Methods

       o public void EvTimer::again (void  )

       o public EvTimer::__construct NULL (double  $after, double  $repeat, callable  $callback, [mixed  $data], [int  $priority])

       o finalpublicstatic  EvTimer EvTimer::createStopped NULL (double  $after, double  $repeat, callable  $callback, [mixed  $data], [int  $pri-
	 ority])

       o public void EvTimer::set (double  $after, double  $repeat)

       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 $repeat
		- If repeat is 0.0 , then it will automatically be stopped once the timeout is reached. If it is positive,  then  the  timer  will
		automatically be configured to trigger again every repeat seconds later, until stopped manually.

	      o $remaining
		-  Returns  the  remaining  time until a timer fires. If the timer is active, then this time is relative to the current event loop
		time, otherwise it's the timeout value currently configured.  That is, after instanciating an EvTimer with an $after value of  5.0
		and  $repeat value of 7.0 , $remaining returns 5.0 . When the timer is started and one second passes, $remaining will return 4.0 .
		When the timer expires and is restarted, it will return roughly 7.0 (likely slightly less as callback invocation takes	some  time
		too), and so on.

PHP Documentation Group 														EVTIMER(3)