[MacRuby] #542: Attempt to unlock a mutex which is not locked (ThreadError)

[MacRuby]

#542: Attempt to unlock a mutex which is not locked (ThreadError)
-------------------------------------+--------------------------------------
 Reporter:  valerii.hiora@…          |       Owner:  lsansonetti@…        
     Type:  defect                   |      Status:  new                  
 Priority:  major                    |   Milestone:  MacRuby 1.0          
Component:  MacRuby                  |    Keywords:                       
-------------------------------------+--------------------------------------

Comment(by jhemmelg@…):

 I think I have a possible reduction for this problem.  I was prototyping
 some thread code for work and tried it out on macruby version 0.8.  It
 acts like a race condition.  Mostly it manifests with the error about
 unlocking an unlocked mutex, but I have had it end up with the mutex
 locked and the threads blocked.  Here is a sample of running the script:

 {{{
 $ macruby testThreadComm.rb
 0
 ^C
 $ macruby testThreadComm.rb
 0
 1251879
 2504224
 3709045
 5051891
 6291455
 7625310
 8934016
 $ macruby testThreadComm.rb
 0
 1315628
 2659968
 3938967
 testThreadComm.rb:62:in `<main>': Attempt to unlock a mutex which is not
 locked (ThreadError)
 }}}

 The first time the program locked up and I had to kill it.  I assume the
 mutex was locked, blocking progress on either thread.  The second
 invocation is a clean run, and the third ends with the mutex being
 unlocked when it shouldn't be.  Most of the time it completes without a
 problem.

-- 
Ticket URL: <http://www.macruby.org/trac/ticket/542#comment:3>
MacRuby <http://macruby.org/>