From: Heesob Park <redmine@...>
Date: 2010-07-23T13:55:33+09:00
Subject: [ruby-core:31454] [Bug #3606] Thread.stop and puts fail to work as documented.

Bug #3606: Thread.stop and puts fail to work as documented.
http://redmine.ruby-lang.org/issues/show/3606

Author: Heesob Park
Status: Open, Priority: Normal
Category: core, Target version: 1.9.x
ruby -v: ruby 1.9.3dev (2010-07-22 trunk 28707) [i686-linux] 

I have tested following three codes which are the sample code in RDoc Documentation.

t1.rb
====================================================
a = Thread.new { puts "a"; Thread.stop; puts "c" }
Thread.pass
puts "Got here"
a.run
a.join
sleep 1
====================================================

t2.rb
====================================================
a = Thread.new { print "a"; Thread.stop; print "c" }
Thread.pass
print "b"
a.run
a.join
sleep 1
====================================================

t3.rb
====================================================
c = Thread.new { Thread.stop; puts "hey!" }
c.wakeup
sleep 1
====================================================

Expected output
t1.rb
	a
	Got here
	c

t2.rb
	abc

t3.rb
	hey!
		
	
on Ruby 1.8.6

	$ ruby -v
	ruby 1.8.6 (2009-06-08 patchlevel 369) [i686-linux]
	$ ruby -v t1.rb
	a
	Got here
	c
	$ ruby -v t2.rb
	abc$ ruby -v t3.rb
	hey!
	$

Result
	t1.rb ==> success
	t2.rb ==> success
	t3.rb ==> success

on Ruby 1.9.1

	$ ruby -v
	ruby 1.9.1p378 (2010-01-10 revision 26273) [i686-linux]
	$ ruby t1.rb
	aGot here

	c
	$ ruby t2.rb
	$ ruby t3.rb
	$
	
Result
	t1.rb ==> fail
	t2.rb ==> success
	t3.rb ==> fail
	
On Ruby 1.9.3dev

	duometis02@Duo02:~$ ruby -v
	ruby 1.9.3dev (2010-07-22 trunk 28707) [i686-linux]
	$ ruby t1.rb
	Got herea

	t1.rb:5:in `join': deadlock detected (fatal)
		from t1.rb:5:in `<main>'
	$ ruby t2.rb
	bat2.rb:5:in `join': deadlock detected (fatal)
		from t2.rb:5:in `<main>'
	$ ruby t3.rb
	$

Result
	t1.rb ==> fail
	t2.rb ==> fail
	t3.rb ==> fail
	
Interesingly, the following code sometimes works and sometimes failed on Ruby 1.9.3.dev.
t4.rb
====================================================
c = Thread.new { Thread.stop; puts "hey!" }
puts "Hi!"
c.wakeup
sleep 1
====================================================
$ ruby -v
ruby 1.9.3dev (2010-07-22 trunk 28707) [i686-linux]
$ ruby t4.rb
Hi!
$ ruby t4.rb
Hi!
hey!
$ ruby t4.rb
Hi!
hey!
$ ruby t4.rb
Hi!
$


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