From: ctm@... (Clifford T. Matthews)
Date: 2006-09-29T14:25:05+09:00
Subject: Re: continuations across fork?

>>>>> "K." == Keith Gaughan <kmgaughan@eircom.net> writes:

    K.> Ok, after reading the rest of your reply, I think I may have
    K.> misunderstood you. Could you give us a minimal fragment of
    K.> code to trigger this? It could be an OS-specific problem.

This isn't necessarily the minimum, and it's obviously not anything
useful and can be rewritten, but this will cause the error:

#! /bin/env ruby
$VERBOSE = true

i = 0

class X
  def self.c
    @@c
  end
  def self.c=(val)
    @@c = val
  end
end

callcc do |z|
  d = z
  callcc do |cont|
    X.c = cont
  end
  d.call if i < 2
  exit
end

i += 1
fork do
  puts "child"
  X.c.call
end
puts "parent"

The entire toy server that actually uses my technique is about 100
lines, with comments.  I don't mind posting it.

-- 
Cliff Matthews <ctm@ardi.com>
+1 505 363 5754 Cell