Jordan Sissel created JRUBY-6528:
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Summary: Socket#connect_nonblock and IO::select appear to be
misbehaving?
Key: JRUBY-6528
URL: https://jira.codehaus.org/browse/JRUBY-6528
Project: JRuby
Issue Type: Bug
Affects Versions: JRuby 1.6.6, JRuby 1.6.7
Reporter: Jordan Sissel
Assignee: Thomas E Enebo
I'm working on some socket code that uses IO.select() and
Socket#connect_nonblock to do connects with timeout, pretty much in the same
way as the Ruby MRI docs have example code(1) for such:
I have sample code that works fine in MRI 1.9.x And 1.8.x, but not JRuby 1.6.7
(in either 1.8 or 1.9 modes)
Sample code:
https://github.com/jordansissel/experiments/blob/master/ruby/sockets/connect-nonblock.rb
Here is the output running under many different rubies:
{noformat}
{:version=>"1.9.2 @ jruby-1.6.5", :socket=>nil}
{:version=>"1.9.2 @ ruby", :socket=>#<Socket:fd 3>}
{:version=>"1.9.2 @ jruby-1.6.6", :socket=>nil}
{:version=>"1.9.3 @ ruby", :socket=>#<Socket:fd 5>}
{:version=>"1.9.2 @ jruby-1.6.7", :socket=>nil}
{noformat}
The problem appears to be the behavior of IO.select. In my sample code, I
expect the 'writer' to be an array containing the socket - when the socket is
connected. JRuby seems to not do this:
{noformat}
reader, writer, error = IO.select(nil, [socket], nil, timeout)
p :version => PLATFORM, :writer => writer
{noformat}
output:
{noformat}
{:version=>"1.8.7 @ jruby-1.6.5", :writer=>nil}
{:version=>"1.9.2 @ ruby", :writer=>[#<Socket:fd 3>]}
{:version=>"1.8.7 @ jruby-1.6.6", :writer=>nil}
{:version=>"1.9.3 @ ruby", :writer=>[#<Socket:fd 5>]}
{:version=>"1.8.7 @ jruby-1.6.7", :writer=>nil}
{noformat}
(1) See 'example code' from MRI docs
http://ruby-doc.org/stdlib-1.9.3/libdoc/socket/rdoc/Socket.html#method-i-connect_nonblock
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