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=head1 NAME |
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EV::Loop::Async - run an EV event loop asynchronously |
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=head1 SYNOPSIS |
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use EV::Loop::Async; |
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=head1 DESCRIPTION |
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TODO. |
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=over 4 |
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=cut |
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package EV::Loop::Async; |
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use common::sense; |
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use EV (); |
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use Async::Interrupt (); |
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use base 'EV::Loop'; |
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BEGIN { |
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our $VERSION = '0.02'; |
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require XSLoader; |
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XSLoader::load ("EV::Loop::Async", $VERSION); |
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} |
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=item $loop = EV::Loop::Async::default |
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Return the default loop, usable by all programs. The default loop will be |
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created on the first call to C<default> by calling X<new EV::Loop>, and |
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should be used by all programs unless they have special requirements. |
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=cut |
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our ($LOOP, $ASYNC); |
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sub default() { |
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$LOOP || do { |
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$LOOP = new EV::Loop::Async; |
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# $ASYNC = $LOOP->async; |
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$LOOP |
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} |
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} |
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=item $loop = new EV::Loop $flags, [Async-Interrupt-Arguments...] |
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This constructor: |
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=over 4 |
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=item 1. creates a new C<EV::Loop> (similar C<new EV::Loop>). |
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=item 2. creates a new L<Async::Interrupt> object and attaches itself to it. |
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=item 3. locks the loop (see below). |
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=item 4. creates a new background thread. |
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=item 5. runs C<< $loop->run >> in that thread. |
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=back |
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=cut |
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sub new { |
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my ($class, $flags, @asy) = @_; |
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my $self = bless $class->SUPER::new ($flags), $class; |
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my ($c_func, $c_arg) = _c_func $self; |
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my $asy = new Async::Interrupt @asy, c_cb => [$c_func, $c_arg]; |
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$self->_attach ($asy, $asy->signal_func); |
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$self |
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} |
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=item $loop->nudge |
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Wake up the asynchronous loop. This is useful after registering a new |
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watcher, to ensure that the background event loop integrates the new |
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watcher(s) (which only happens when it iterates, which you can force by |
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calling this method). |
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Without calling this method, the event loop I<eventually> takes notice |
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of new watchers, bit when this happens is not wlel-defined (can be |
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instantaneous, or take a few hours). |
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No locking is required. |
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Example: lock the loop, create a timer, nudge the loop so it takes notice |
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of the new timer, then evily busy-wait till the timer fires. |
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my $timer; |
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my $flag; |
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{ |
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$loop->scope_lock; |
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$timer = $loop->timer (1, 0, sub { $flag = 1 }); |
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$loop->nudge; |
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} |
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1 until $flag; |
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=head1 SEE ALSO |
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L<EV>, L<Async::Interrupt>. |
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=head1 AUTHOR |
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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=cut |
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1 |
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