unix and timers

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LEARN ABOUT PHP

evtimer

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)

Programming