From 890df4a6586d1f09b4da8cfd1e70a389fd16fef4 Mon Sep 17 00:00:00 2001
From: normal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 6 May 2015 20:30:43 +0000
Subject: stdlib: use IO#wait_*able instead of IO.select when possible

In case a process encounters high-numbered FDs, this allows
consistent performance on systems with ppoll support.
[ruby-core:35572]

* ext/socket/lib/socket.rb (connect_nonblock): use IO#wait_writable
* lib/drb/drb.rb (DRB::DRbTCPSocket#alive?): use IO#wait_readable
* lib/webrick/httpserver.rb (run): ditto
* lib/resolv.rb (request): ditto for single socket case
  [ruby-core:68943] [Feature #11081]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50432 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/resolv.rb | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'lib/resolv.rb')

diff --git a/lib/resolv.rb b/lib/resolv.rb
index e67dff9704..9083bd0b53 100644
--- a/lib/resolv.rb
+++ b/lib/resolv.rb
@@ -1,6 +1,7 @@
 require 'socket'
 require 'timeout'
 require 'thread'
+require 'io/wait'
 
 begin
   require 'securerandom'
@@ -680,7 +681,11 @@ class Resolv
           if timeout <= 0
             raise ResolvTimeout
           end
-          select_result = IO.select(@socks, nil, nil, timeout)
+          if @socks.size == 1
+            select_result = @socks[0].wait_readable(timeout) ? [ @socks ] : nil
+          else
+            select_result = IO.select(@socks, nil, nil, timeout)
+          end
           if !select_result
             after_select = Time.now
             next if after_select < timelimit
-- 
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