drb: simplify shutdown pipe close logic

IO#close is idempotent, so we don't need to waste bytecode
to check or nil it at shutdown time.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64531 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 9 deletions

diff --git a/lib/drb/drb.rb b/lib/drb/drb.rb
index dd725529c0..36b2b1ade4 100644
--- a/lib/drb/drb.rb
+++ b/lib/drb/drb.rb
@@ -961,14 +961,8 @@ module DRb
     end
 
     def close_shutdown_pipe
-      if @shutdown_pipe_r && !@shutdown_pipe_r.closed?
-        @shutdown_pipe_r.close
-        @shutdown_pipe_r = nil
-      end
-      if @shutdown_pipe_w && !@shutdown_pipe_w.closed?
-        @shutdown_pipe_w.close
-        @shutdown_pipe_w = nil
-      end
+      @shutdown_pipe_w.close
+      @shutdown_pipe_r.close
     end
     private :close_shutdown_pipe
 
@@ -1001,7 +995,7 @@ module DRb
 
     # Graceful shutdown
     def shutdown
-      @shutdown_pipe_w.close if @shutdown_pipe_w && !@shutdown_pipe_w.closed?
+      @shutdown_pipe_w.close
     end
 
     # Check to see if this connection is alive.