It looks like ConditionVariable.wait isn't implemented in a way that's consistent with the spec. Please file a bug report on RubyForge.
I'm a bit surprised by the semantics of this class. It doesn't appear possible to use it safely unless there's at least one additional level of locking. -----Original Message----- From: ironruby-core-boun...@rubyforge.org [mailto:ironruby-core-boun...@rubyforge.org] On Behalf Of Daniele Alessandri Sent: Friday, January 02, 2009 4:35 AM To: ironruby-core@rubyforge.org Subject: [Ironruby-core] Problems with Mutex and ConditionVariable under IronRuby Hello, I was playing with threads under IronRuby but it seems like I have stumbled on problems with Mutex and ConditionVariable. At first I thought the problem was related to my code even if it actually worked flawlessy for months under MRI 1.8.6 and it runs fine under the latest JRuby, so I tried to run the most basic example of using these two classes (a classic one: http://www.rubycentral.com/pickaxe/tut_threads.html#UF) but the problems still persist. At first I thought it was some kind of deadlock given that the output obtained by running the code with ir.exe is as follows: C:\Sviluppo\ironruby\SVN\trunk\build\debug>ir T002.rb A: I have critical section, but will wait for cv (Later, back at the ranch...) B: Now I am critical, but am done with cv (note that the process remains stuck there) So I went debugging with Visual Studio and this is what I got in the output window: http://gist.github.com/raw/42514/8d38b629e8ae62d9c4bece398a4041b036d28f12 To make it short, the reported exception is thrown when the ruby code calls ConditionVariable#signal and IronRuby internally calls Monitor.Pulse on the Mutex instance: [RubyMethod("signal")] public static RubyConditionVariable/*!*/ Signal(RubyConditionVariable/*!*/ self) { RubyMutex m = self._mutex; if (m != null) { Monitor.Pulse(m); } return self; } It seems like the Monitor is not aware of being in a synchronized block of code (or is not in a critical section at all). Any clues? Thanks, Daniele -- Daniele Alessandri http://www.clorophilla.net/blog/ _______________________________________________ Ironruby-core mailing list Ironruby-core@rubyforge.org http://rubyforge.org/mailman/listinfo/ironruby-core _______________________________________________ Ironruby-core mailing list Ironruby-core@rubyforge.org http://rubyforge.org/mailman/listinfo/ironruby-core
