From: Tanaka Akira <akr@...>
Date: 2006-07-15T15:54:00+09:00
Subject: Re: [ ruby-Bugs-5067 ] open-uri fails under multithreading

In article <20060715001125.5FD0B5240E0A@rubyforge.org>,
  <noreply@rubyforge.org> writes:

> The following code gives .../lib/ruby/1.8/open-uri.rb:215:in `open_http': uninitialized constant Net::HTTP (NameError) :

It seems a problem of "require".

% cat a.rb
p [__FILE__, __LINE__]
Thread.pass
p [__FILE__, __LINE__]
% ~/ruby/18/ruby/ruby -ve '
t1 = Thread.new {
  p 1
  require "a"
  p 2
}
t2 = Thread.new {
  p 3
  require "a"
  p 4
}
t2.join
t1.join
'
ruby 1.8.5 (2006-07-15) [i686-linux]
1
3
["./a.rb", 1]
4
["./a.rb", 3]
2

After first "require" is called, second "require" is called
before the first "require" is not finished.
It seems the second "require" is finished immediately, not
waiting the first "require" is finished.

Ruby 1.9 has no problem.

% ~/ruby/19/ruby/ruby -ve '
t1 = Thread.new {
  p 1
  require "a"
  p 2
}
t2 = Thread.new {
  p 3
  require "a"
  p 4
}
t2.join
t1.join
'
ruby 1.9.0 (2006-07-15) [i686-linux]
1
3
["/tmp/c/a.rb", 1]
["/tmp/c/a.rb", 3]
2
4
-- 
Tanaka Akira