webrick/utils.rb: adaptive sleep

* lib/webrick/utils.rb (WEBrick::Utils::TimeoutHandler#initialize):
  make sleep intervals adaptive than fixed period intervals.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51234 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,4 +1,7 @@
-Tue Jul 14 11:20:13 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Tue Jul 14 11:21:31 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/webrick/utils.rb (WEBrick::Utils::TimeoutHandler#initialize):
+	  make sleep intervals adaptive than fixed period intervals.
 
 	* lib/webrick/server.rb (WEBrick::GenericServer#start): flush
 	  shutdown pipe.

lib/webrick/utils.rb

@@ -156,15 +156,23 @@ module WEBrick
         Thread.start{
           while true
             now = Time.now
-            @timeout_info.keys.each{|thread|
-              ary = @timeout_info[thread]
+            wakeup = nil
+            @timeout_info.each {|thread, ary|
               next unless ary
               ary.dup.each{|info|
                 time, exception = *info
-                interrupt(thread, info.object_id, exception) if time < now
+                if time < now
+                  interrupt(thread, info.object_id, exception)
+                elsif !wakeup || time < wakeup
+                  wakeup = time
+                end
               }
             }
-            sleep 0.5
+            if !wakeup
+              sleep
+            elsif (wakeup -= now) > 0
+              sleep(wakeup)
+            end
           end
         }
       end