From: daz <dooby@...10.karoo.co.uk>
Date: 2004-05-11T21:48:53+09:00
Subject: Re: DRb Connection Closed Error?!?!?!?


Ken Hilton wrote:
>
> Greetings,
>
> Thanks to those of you who helped me out.  It appears (today) that
> I've resolved this problem, but I'm still not completely satisfied.
> It turns out the macros and batch files I use during development
> always launch ruby.exe in debug mode (-rdebug).

Knowledge of that could make a considerable difference ;-)

> [snip]    So, my new question is this: do any of you see this
> problem when you run my test app in debug mode [...]

   Y e s  ( ruby 1.9.0 (2004-04-27) [i586-bccwin32],  Win98se )

> [...]     and if so, what do you make of it?

As I'm a lower life-form, not a lot.

require 'debug'  # added to server script;  run ...
                 # ... give 'c' at debug prompt;  run client

                 # (changed loop to 3.times)
---------------------------
D:/ruby/DfB/clr/DRb/server2_hilton.rb:12:
(rdb:1) c
Starting MySvr...
MySvr::svc called.
MySvr::svc called.
MySvr::svc called.
D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:558: `connection closed' (DRb::DRbConnError)
        from D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:1321:in `start'
        from D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:1321:in `run'
        from D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:1246:in `initialize'
        from D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:1502:in `new'
        from D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:1502:in `start_service'

        from D:/ruby/DfB/clr/DRb/server2_hilton.rb:29
D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:558:      raise(DRbConnError, 'connection closed') if sz.nil?
(rdb:3) w
--> #1 D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:558:in `load'
    #2 D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:591:in `recv_request'
    #3 D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:855:in `recv_request'
    #4 D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:1406:in `init_with_client'
    #5 D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:1418:in `setup_message'
    #6 D:/RUBY/SRC_CVSINST/lib/ruby/1.9/drb/drb.rb:1388:in `perform'
(rdb:3)
---------------------------


A note to higher life-forms:
   I added a set_trace_func to drb.rb (outputting to a file) in order
   to provide some useful log data to pass on.  Of course, whenever
   one carefully sets a trap, the bug decides to stay away :((

In drb.rb, replaced equal number of doc lines with code below to preserve
  reference lines.  Gives full trace - but no DRb::DRbConnError
  (with require 'debug' still in the server script).

#--------------
$tf = File.open('drbsrv2_trace.txt', 'w')
END { $tf.close }
#
stf1 = lambda { | ev, fi, li, ty, bi, cl |
    $tf.printf("\n      %20s :%4d: %25s %15s   %8s ... ", File.basename(fi), li, ty, cl, ev)
}
stf2 = lambda { | ev, fi, li, ty, bi, cl |  #?# set_trace_func(stf2)  #  dbg (inside thread)
    $tf.printf("\n<THR> %20s :%4d: %25s %15s   %8s ... ", File.basename(fi), li, ty, cl, ev)
}
#set_trace_func(stf1)  #  dbg (main thread)  #  <----  [Note:1]
#--------------

   [Note:1]  uncomment the line to "fix" the  require 'debug'  problem.


Then disabled the trace and tried sprinkling "sleep 0.2" around to slow
things down a different way -- no difference.


daz