From: Oliver Peng <oliver.peng@...>
Date: 2009-09-16T06:11:00+09:00
Subject: Socket hang in thread

Design a thread and in the thread start a new TCPServer and get income
string.

Start irb in Windows cmd:

irb(main):001:0> require 'socket'
=> true
irb(main):002:0>
irb(main):003:0* class TestServe < Thread
irb(main):004:1>
irb(main):005:1*   def initialize(host, port)
irb(main):006:2>
irb(main):007:2*     @tcpServer = TCPServer.new(host, port)
irb(main):008:2>     @tcpServer.listen(25)
irb(main):009:2>
irb(main):010:2*     super {
irb(main):011:3*       begin
irb(main):012:4*         if tcp = @tcpServer.accept
irb(main):013:5>
irb(main):014:5*           while line = tcp.gets()
irb(main):015:6>             puts line
irb(main):016:6>             tcp.write(line)
irb(main):017:6>           end
irb(main):018:5>         end
irb(main):019:4>       rescue SignalException, StandardError => e
irb(main):020:4>           puts("%s exception %s:\n%s" % [self.class,
e.inspect
, e.backtrace.join("\n")])
irb(main):021:4>       end
irb(main):022:3>     }
irb(main):023:2>   end
irb(main):024:1> end
=> nil
irb(main):025:0>
irb(main):026:0*
irb(main):027:0* server = TestServe.new('127.0.0.1', 12345)
=> #<TestServe:0x1019a700 sleep>
irb(main):028:0>

I open another Windows cmd window and try to use telnet to connect to
same address and port. The problem is all chars I input in telnet
doesn't show in irb until I go back to irb window and hit return button.

So it looks that in thread the server socket was blocked.

I also tried to start irb and run same code in the Cygwin cmd
enviroment. Once I input anything in telnet, I can see it in irb.

Any suggestions?

Thanks.
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