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Paul Evans


IO::Async::Loop::Poll - use IO::Async with poll(2)


Normally an instance of this class would not be directly constructed by a program. It may however, be useful for runinng IO::Async with an existing program already using an IO::Poll object.

 use IO::Poll;
 use IO::Async::Loop::Poll;

 my $poll = IO::Poll->new;
 my $loop = IO::Async::Loop::Poll->new( poll => $poll );

 $loop->add( ... );

 while(1) {
    my $timeout = ...
    my $ret = $poll->poll( $timeout );


This subclass of IO::Async::Loop uses an IO::Poll object to perform read-ready and write-ready tests.

To integrate with existing code that uses an IO::Poll, a post_poll can be called immediately after the poll method on the contained IO::Poll object. The appropriate mask bits are maintained on the IO::Poll object when notifiers are added or removed from the set, or when they change their want_writeready status. The post_poll method inspects the result bits and invokes the on_read_ready or on_write_ready methods on the notifiers.


$loop = IO::Async::Loop::Poll->new( %args )

This function returns a new instance of a IO::Async::Loop::Poll object. It takes the following named arguments:


The IO::Poll object to use for notification. Optional; if a value is not given, a new IO::Poll object will be constructed.


$count = $loop->post_poll( $poll )

This method checks the returned event list from a IO::Poll::poll call, and calls any of the notification methods or callbacks that are appropriate. It returns the total number of callbacks that were invoked; that is, the total number of on_read_ready and on_write_ready callbacks for watch_io, and watch_time event callbacks.


Reference to the IO::Poll object

$count = $loop->loop_once( $timeout )

This method calls the poll method on the stored IO::Poll object, passing in the value of $timeout, and then runs the post_poll method on itself. It returns the total number of callbacks invoked by the post_poll method, or undef if the underlying poll method returned an error.


Paul Evans <leonerd@leonerd.org.uk>