ds: rely on refcounting to close descriptors

Since we have EPOLL_CTL_DEL implemented for the poll(2) and
kqueue backends, we can rely on Perl refcounting to gently
close(2) the underlying file descriptors as references get
dropped.

This may be beneficial in the future if we want to drop a
descriptor from the event loop without actually closing it.

diff --git a/lib/PublicInbox/DS.pm b/lib/PublicInbox/DS.pm
index a82360239f43a79e86eaf97f7afcbf0149f29858..57c420634ca42529f8b7c01a29d459723ad5933c 100644 (file)
--- a/lib/PublicInbox/DS.pm
+++ b/lib/PublicInbox/DS.pm
@@ -259,17 +259,8 @@ sub PostEventLoop {
     # now we can close sockets that wanted to close during our event processing.
     # (we didn't want to close them during the loop, as we didn't want fd numbers
     #  being reused and confused during the event loop)
-    while (my $sock = shift @ToClose) {
-        my $fd = fileno($sock);
-
-        # close the socket. (not a PublicInbox::DS close)
-        CORE::close($sock);
-
-        # and now we can finally remove the fd from the map.  see
-        # comment above in ->close.
-        delete $DescriptorMap{$fd};
-    }
-
+    delete($DescriptorMap{fileno($_)}) for @ToClose;
+    @ToClose = (); # let refcounting drop everything all at once
 
     # by default we keep running, unless a postloop callback (either per-object
     # or global) cancels it