[PATCH] socket/pure_ruby: fix Ruby 1.8 compatibility

[Eric Wong <e@80x24.org>]

For non-kgio users, IO#wait_readable did not appear until Ruby 2.0.
Additionally, optimistically perform reads before waiting because
EOF handling behavior differs in current revisions of Ruby 2.3.0dev.
---
 lib/mogilefs/socket/pure_ruby.rb | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/mogilefs/socket/pure_ruby.rb b/lib/mogilefs/socket/pure_ruby.rb
index 7530a40..e74bbef 100644
--- a/lib/mogilefs/socket/pure_ruby.rb
+++ b/lib/mogilefs/socket/pure_ruby.rb
@@ -23,15 +23,15 @@ class MogileFS::Socket < Socket
     sock
   end
 
-  def wait_writable(timeout)
+  def wait_writable(timeout = nil)
     IO.select(nil, [ self ], nil, timeout)
   end unless self.instance_methods.include?(:wait_writable) # Ruby <2.0.0
 
   def timed_read(len, dst = "", timeout = 5)
     begin
-      wait_readable(timeout) or unreadable_socket!(timeout)
       return read_nonblock(len, dst)
     rescue Errno::EAGAIN
+      wait(timeout) or unreadable_socket!(timeout)
     rescue EOFError
       return
     end while true
@@ -39,10 +39,10 @@ class MogileFS::Socket < Socket
 
   def timed_peek(len, dst, timeout = 5)
     begin
-      wait_readable(timeout) or unreadable_socket!(timeout)
       rc = recv_nonblock(len, Socket::MSG_PEEK)
       return rc.empty? ? nil : dst.replace(rc)
     rescue Errno::EAGAIN
+      wait(timeout) or unreadable_socket!(timeout)
     rescue EOFError
       dst.replace("")
       return
-- 
EW