socket/pure_ruby: reduce Errno::EAGAIN exceptions

Exceptions are expensive, and Errno::EAGAIN is especially so
in MRI 1.9.2+, so avoid generating too many of them.  This
is the whole reason kgio exists, after all.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/mogilefs/socket/pure_ruby.rb b/lib/mogilefs/socket/pure_ruby.rb
index df8dfb9..24d576a 100644
--- a/lib/mogilefs/socket/pure_ruby.rb
+++ b/lib/mogilefs/socket/pure_ruby.rb
@@ -24,9 +24,9 @@ class MogileFS::Socket < Socket
 
   def timed_read(len, dst = "", timeout = 5)
     begin
+      IO.select([self], nil, nil, timeout) or unreadable_socket!
       return read_nonblock(len, dst)
     rescue Errno::EAGAIN
-      IO.select([self], nil, nil, timeout) or unreadable_socket!
     rescue EOFError
       return
     end while true
@@ -34,10 +34,10 @@ class MogileFS::Socket < Socket
 
   def timed_peek(len, dst, timeout = 5)
     begin
+      IO.select([self], nil, nil, timeout) or unreadable_socket!
       rc = recv_nonblock(len, Socket::MSG_PEEK)
       return rc.empty? ? nil : dst.replace(rc)
     rescue Errno::EAGAIN
-      IO.select([self], nil, nil, timeout) or unreadable_socket!
     rescue EOFError
       dst.replace("")
       return