IO::Async::Loop::SelecUser Contributed Perl DocumentIO::Async::Loop::Select(3)NAME
"IO::Async::Loop::Select" - use "IO::Async" with "select(2)"
SYNOPSIS
use IO::Async::Loop::Select;
my $loop = IO::Async::Loop::Select->new();
$loop->add( ... );
$loop->loop_forever();
Or
while(1) {
$loop->loop_once();
...
}
Or
while(1) {
my ( $rvec, $wvec, $evec ) = ('') x 3;
my $timeout;
$loop->pre_select( \$rvec, \$wvec, \$evec, \$timeout );
...
my $ret = select( $rvec, $wvec, $evec, $timeout );
...
$loop->post_select( $rvec, $evec, $wvec );
}
DESCRIPTION
This subclass of "IO::Async::Loop" uses the "select()" syscall to
perform read-ready and write-ready tests.
To integrate with an existing "select()"-based event loop, a pair of
methods "pre_select()" and "post_select()" can be called immediately
before and after a "select()" call. The relevant bit in the read-ready
bitvector is always set by the "pre_select()" method, but the
corresponding bit in write-ready vector is set depending on the state
of the 'want_writeready' property. The "post_select()" method will
invoke the "on_read_ready()" or "on_write_ready()" methods or callbacks
as appropriate.
CONSTRUCTOR
$loop = IO::Async::Loop::Select->new()
This function returns a new instance of a "IO::Async::Loop::Select"
object. It takes no special arguments.
METHODS
$loop->pre_select( \$readvec, \$writevec, \$exceptvec, \$timeout )
This method prepares the bitvectors for a "select()" call, setting the
bits that notifiers registered by this loop are interested in. It will
always set the appropriate bits in the read vector, but will only set
them in the write vector if the notifier's "want_writeready()" property
is true. Neither the exception vector nor the timeout are affected.
\$readvec
\$writevec
\$exceptvec
Scalar references to the reading, writing and exception
bitvectors
\$timeout
Scalar reference to the timeout value
$loop->post_select( $readvec, $writevec, $exceptvec )
This method checks the returned bitvectors from a "select()" call, and
calls any of the notification methods or callbacks that are
appropriate.
$readvec
$writevec
$exceptvec
Scalars containing the read-ready, write-ready and exception
bitvectors
$count = $loop->loop_once( $timeout )
This method calls the "pre_select()" method to prepare the bitvectors
for a "select()" syscall, performs it, then calls "post_select()" to
process the result. It returns the total number of callbacks invoked by
the "post_select()" method, or "undef" if the underlying "select()"
syscall returned an error.
SEE ALSO
ยท IO::Select - OO interface to select system call
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2010-06-09 IO::Async::Loop::Select(3)
