The EvLoop class

Introduction

Represents an event loop that is always distinct from the default loop. Unlike the default loop, it cannot handle EvChild watchers.

Having threads we have to create a loop per thread, and use the default loop in the parent thread.

The default event loop is initialized automatically by Ev. It is accessible via methods of the Ev class, or via EvLoop::defaultLoop method.

Class synopsis

EvLoop

final class EvLoop {

/* Properties */

public $data;

public $backend;

public $is_default_loop;

public $iteration;

public $pending;

public $io_interval;

public $timeout_interval;

public $depth;

/* Methods */

public __construct(
     int $flags = ?,
     mixed $data = NULL ,
     float $io_interval = 0.0 ,
     float $timeout_interval = 0.0
)

public int backend()

final public EvCheck check( string $callback , string $data = ?, string $priority = ?)

final public EvChild child(
     string $pid ,
     string $trace ,
     string $callback ,
     string $data = ?,
     string $priority = ?
)

public static EvLoop defaultLoop(
     int $flags = Ev::FLAG_AUTO ,
     mixed $data = NULL ,
     float $io_interval = 0. ,
     float $timeout_interval = 0.
)

final public EvEmbed embed(
     string $other ,
     string $callback = ?,
     string $data = ?,
     string $priority = ?
)

final public EvFork fork( callable $callback , mixed $data = null , int $priority = 0 )

final public EvIdle idle( callable $callback , mixed $data = null , int $priority = 0 )

public void invokePending()

final public EvIo io(
     mixed $fd ,
     int $events ,
     callable $callback ,
     mixed $data = null ,
     int $priority = 0
)

public void loopFork()

public float now()

public void nowUpdate()

final public EvPeriodic periodic(
     float $offset ,
     float $interval ,
     callable $callback ,
     mixed $data = null ,
     int $priority = 0
)

final public EvPrepare prepare( callable $callback , mixed $data = null , int $priority = 0 )

public void resume()

public void run( int $flags = 0 )

final public EvSignal signal(
     int $signum ,
     callable $callback ,
     mixed $data = null ,
     int $priority = 0
)

final public EvStat stat(
     string $path ,
     float $interval ,
     callable $callback ,
     mixed $data = null ,
     int $priority = 0
)

public void stop( int $how = ?)

public void suspend()

final public EvTimer timer(
     float $after ,
     float $repeat ,
     callable $callback ,
     mixed $data = null ,
     int $priority = 0
)

public void verify()

}

Properties

data

Custom data attached to loop

backend

Readonly. The backend flags indicating the event backend in use.

is_default_loop

Readonly. true if it is the default event loop.

iteration

The current iteration count of the loop. See Ev::iteration

pending

The number of pending watchers. 0 indicates that there are no watchers pending.

io_interval

Higher io_interval allows libev to spend more time collecting EvIo events, so more events can be handled per iteration, at the cost of increasing latency. Timeouts (both EvPeriodic and EvTimer) will not be affected. Setting this to a non-zero value will introduce an additional sleep() call into most loop iterations. The sleep time ensures that libev will not poll for EvIo events more often than once per this interval, on average. Many programs can usually benefit by setting the io_interval to a value near 0.1, which is often enough for interactive servers(not for games). It usually doesn't make much sense to set it to a lower value than 0.01, as this approaches the timing granularity of most systems.

timeout_interval

Higher timeout_interval allows libev to spend more time collecting timeouts, at the expense of increased latency/jitter/inexactness(the watcher callback will be called later). EvIo watchers will not be affected. Setting this to a non-null value will not introduce any overhead in libev. See also » FUNCTIONS CONTROLLING EVENT LOOPS.

depth

The recursion depth. See Ev::depth.

Table of Contents

EvLoop::backend — Returns an integer describing the backend used by libev
EvLoop::check — Creates EvCheck object associated with the current event loop instance
EvLoop::child — Creates EvChild object associated with the current event loop
EvLoop::__construct — Constructs the event loop object
EvLoop::defaultLoop — Returns or creates the default event loop
EvLoop::embed — Creates an instance of EvEmbed watcher associated with the current EvLoop object
EvLoop::fork — Creates EvFork watcher object associated with the current event loop instance
EvLoop::idle — Creates EvIdle watcher object associated with the current event loop instance
EvLoop::invokePending — Invoke all pending watchers while resetting their pending state
EvLoop::io — Create EvIo watcher object associated with the current event loop instance
EvLoop::loopFork — Must be called after a fork
EvLoop::now — Returns the current "event loop time"
EvLoop::nowUpdate — Establishes the current time by querying the kernel, updating the time returned by EvLoop::now in the progress
EvLoop::periodic — Creates EvPeriodic watcher object associated with the current event loop instance
EvLoop::prepare — Creates EvPrepare watcher object associated with the current event loop instance
EvLoop::resume — Resume previously suspended default event loop
EvLoop::run — Begin checking for events and calling callbacks for the loop
EvLoop::signal — Creates EvSignal watcher object associated with the current event loop instance
EvLoop::stat — Creates EvStat watcher object associated with the current event loop instance
EvLoop::stop — Stops the event loop
EvLoop::suspend — Suspend the loop
EvLoop::timer — Creates EvTimer watcher object associated with the current event loop instance
EvLoop::verify — Performs internal consistency checks(for debugging)