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| | # Copyright (C) 2019-2020 all contributors <meta@public-inbox.org>
# Licensed the same as Danga::Socket (and Perl5)
# License: GPL-1.0+ or Artistic-1.0-Perl
# <https://www.gnu.org/licenses/gpl-1.0.txt>
# <https://dev.perl.org/licenses/artistic.html>
#
# poll(2) via IO::Poll core module. This makes poll look
# like epoll to simplify the code in DS.pm. This is NOT meant to be
# an all encompassing emulation of epoll via IO::Poll, but just to
# support cases public-inbox-nntpd/httpd care about.
package PublicInbox::DSPoll;
use strict;
use warnings;
use parent qw(Exporter);
use IO::Poll;
use PublicInbox::Syscall qw(EPOLLONESHOT EPOLLIN EPOLLOUT EPOLL_CTL_DEL);
our @EXPORT_OK = qw(epoll_ctl epoll_wait);
sub new { bless {}, $_[0] } # fd => events
sub epoll_ctl {
my ($self, $op, $fd, $ev) = @_;
# not wasting time on error checking
if ($op != EPOLL_CTL_DEL) {
$self->{$fd} = $ev;
} else {
delete $self->{$fd};
}
0;
}
sub epoll_wait {
my ($self, $maxevents, $timeout_msec, $events) = @_;
my @pset;
while (my ($fd, $events) = each %$self) {
my $pevents = $events & EPOLLIN ? POLLIN : 0;
$pevents |= $events & EPOLLOUT ? POLLOUT : 0;
push(@pset, $fd, $pevents);
}
@$events = ();
my $n = IO::Poll::_poll($timeout_msec, @pset);
if ($n >= 0) {
for (my $i = 0; $i < @pset; ) {
my $fd = $pset[$i++];
my $revents = $pset[$i++] or next;
delete($self->{$fd}) if $self->{$fd} & EPOLLONESHOT;
push @$events, [ $fd ];
}
my $nevents = scalar @$events;
if ($n != $nevents) {
warn "BUG? poll() returned $n, but got $nevents";
}
}
$n;
}
1;
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