listener: use edge-triggered notifications

We don't need extra wakeups from the kernel when we know a
listener is already active.

1 files changed, 4 insertions, 3 deletions

diff --git a/lib/PublicInbox/Listener.pm b/lib/PublicInbox/Listener.pm
index 94b2aed4..594dabb8 100644
--- a/lib/PublicInbox/Listener.pm
+++ b/lib/PublicInbox/Listener.pm
@@ -9,6 +9,7 @@ use base 'PublicInbox::DS';
 use Socket qw(SOL_SOCKET SO_KEEPALIVE IPPROTO_TCP TCP_NODELAY);
 use fields qw(post_accept);
 require IO::Handle;
+use PublicInbox::Syscall qw(EPOLLIN EPOLLEXCLUSIVE EPOLLET);
 
 sub new ($$$) {
         my ($class, $s, $cb) = @_;
@@ -17,15 +18,14 @@ sub new ($$$) {
         listen($s, 1024);
         IO::Handle::blocking($s, 0);
         my $self = fields::new($class);
-        $self->SUPER::new($s, PublicInbox::DS::EPOLLIN()|
-                              PublicInbox::DS::EPOLLEXCLUSIVE());
+        $self->SUPER::new($s, EPOLLIN|EPOLLET|EPOLLEXCLUSIVE);
         $self->{post_accept} = $cb;
         $self
 }
 
 sub event_step {
         my ($self) = @_;
-        my $sock = $self->{sock};
+        my $sock = $self->{sock} or return;
 
         # no loop here, we want to fairly distribute clients
         # between multiple processes sharing the same socket
@@ -35,6 +35,7 @@ sub event_step {
         if (my $addr = accept(my $c, $sock)) {
                 IO::Handle::blocking($c, 0); # no accept4 :<
                 $self->{post_accept}->($c, $addr, $sock);
+                $self->requeue;
         }
 }