# The thread problem in ruby imap **URL:** \ **Category:** ruby-talk\ **Created:** [4 January 2009 13:45 UTC](https://rubytalk.org/t/the-thread-problem-in-ruby-imap/50980 "2009-01-04T13:45:45Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Wen\_Lan](https://avatars.discourse-cdn.com/v4/letter/w/f6c823/32.png) [@Wen\_Lan](https://rubytalk.org/u/Wen_Lan)\ **Post date:** [4 January 2009 13:45 UTC](https://rubytalk.org/t/the-thread-problem-in-ruby-imap/50980/1 "2009-01-04T13:45:45Z")
hi, all   my application is about ruby imap, it depends on daemons lib and runs as a background job. when it fetches the mails from gmail, it will throw the error below randomly: 2008-12-30 11:37:04 ERROR failed to process message 6@11: stopping only thread note: use sleep to stop forever backtrace at Tue Dec 30 11:37:04 -0800 2008: /usr/lib/ruby/1.8/monitor.rb:102:in `stop' /usr/lib/ruby/1.8/monitor.rb:102:in `wait' /usr/lib/ruby/1.8/net/imap.rb:954:in `get\_tagged\_response' /usr/lib/ruby/1.8/net/imap.rb:1014:in `send\_command' /usr/lib/ruby/1.8/monitor.rb:238:in `synchronize' /usr/lib/ruby/1.8/net/imap.rb:999:in `send\_command' /usr/lib/ruby/1.8/net/imap.rb:392:in `select' /usr/lib/ruby/1.8/monitor.rb:238:in `synchronize' /usr/lib/ruby/1.8/net/imap.rb:390:in `select' /usr/lib/ruby/gems/1.8/gems/daemons-1.0.10/lib/daemons/application.rb:176:in `load' /usr/lib/ruby/gems/1.8/gems/daemons-1.0.10/lib/daemons/application.rb:176:in `start\_load' /usr/lib/ruby/gems/1.8/gems/daemons-1.0.10/lib/daemons/application.rb:253:in `start' /usr/lib/ruby/gems/1.8/gems/daemons-1.0.10/lib/daemons/controller.rb:69:in `run' /usr/lib/ruby/gems/1.8/gems/daemons-1.0.10/lib/daemons.rb:139:in `run' /usr/lib/ruby/gems/1.8/gems/daemons-1.0.10/lib/daemons/cmdline.rb:105:in `call' /usr/lib/ruby/gems/1.8/gems/daemons-1.0.10/lib/daemons/cmdline.rb:105:in `catch\_exceptions' /usr/lib/ruby/gems/1.8/gems/daemons-1.0.10/lib/daemons.rb:138:in `run' the ruby version is 1.8.5. any ideas? thank you! > **···** > > -- > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). ---
**Author:** ![Charles\_Oliver\_Nutte](https://avatars.discourse-cdn.com/v4/letter/c/71e660/32.png) [@Charles\_Oliver\_Nutte](https://rubytalk.org/u/Charles_Oliver_Nutte)\ **Post date:** [4 January 2009 14:11 UTC](https://rubytalk.org/t/the-thread-problem-in-ruby-imap/50980/2 "2009-01-04T14:11:45Z")
Wen Lan wrote: > hi, all > >   my application is about ruby imap, it depends on daemons lib and runs > as a background job. when it fetches the mails from gmail, it will throw > the error below randomly: I've noticed some really odd threading behavior in net/imap too. I think it needs a bit of a threading overhaul. We have at least one reported bug in JRuby that seems to be related to bad use of mutexes: [http://jira.codehaus.org/browse/JRUBY-2950](http://jira.codehaus.org/browse/JRUBY-2950) This could be the same thing, but perhaps we're not detecting that it's the only thread stopping (since we don't have as rigid control over threads). - Charlie ---
**Author:** ![Wen\_Lan](https://avatars.discourse-cdn.com/v4/letter/w/f6c823/32.png) [@Wen\_Lan](https://rubytalk.org/u/Wen_Lan)\ **Post date:** [5 January 2009 02:26 UTC](https://rubytalk.org/t/the-thread-problem-in-ruby-imap/50980/3 "2009-01-05T02:26:44Z")
Charles Oliver Nutter wrote: > Wen Lan wrote: > > > hi, all > > > >   my application is about ruby imap, it depends on daemons lib and runs > > as a background job. when it fetches the mails from gmail, it will throw > > the error below randomly: > > I've noticed some really odd threading behavior in net/imap too. I think > it needs a bit of a threading overhaul. We have at least one reported > bug in JRuby that seems to be related to bad use of mutexes: > > [http://jira.codehaus.org/browse/JRUBY-2950](http://jira.codehaus.org/browse/JRUBY-2950) > > This could be the same thing, but perhaps we're not detecting that it's > the only thread stopping (since we don't have as rigid control over > threads). > > - Charlie Charlie， thank you for your reply! the error is about ruby monitor implementation or imap? what do you think? > **···** > > -- > Posted via [http://www.ruby-forum.com/\](http://www.ruby-forum.com/%5C). ---
**Author:** ![Charles\_Oliver\_Nutte](https://avatars.discourse-cdn.com/v4/letter/c/71e660/32.png) [@Charles\_Oliver\_Nutte](https://rubytalk.org/u/Charles_Oliver_Nutte)\ **Post date:** [5 January 2009 10:39 UTC](https://rubytalk.org/t/the-thread-problem-in-ruby-imap/50980/4 "2009-01-05T10:39:20Z")
Wen Lan wrote: > Charlie， thank you for your reply! > > the error is about ruby monitor implementation or imap? what do you think? Well, looking at imap makes my head hurt, so I'm going to say it's a problem in imap. I'm fairly confident in both the JRuby and Ruby Mutex implementations, since they're not particularly complicated. But I'm not at all confident in the imap code. - Charlie ---
**Author:** ![Wen\_Lan](https://avatars.discourse-cdn.com/v4/letter/w/f6c823/32.png) [@Wen\_Lan](https://rubytalk.org/u/Wen_Lan)\ **Post date:** [5 January 2009 10:54 UTC](https://rubytalk.org/t/the-thread-problem-in-ruby-imap/50980/5 "2009-01-05T10:54:44Z")
Charles Oliver Nutter wrote: > Wen Lan wrote: > > > Charlie， thank you for your reply! > > > > the error is about ruby monitor implementation or imap? what do you > > think? > > Well, looking at imap makes my head hurt, so I'm going to say it's a > problem in imap. I'm fairly confident in both the JRuby and Ruby Mutex > implementations, since they're not particularly complicated. But I'm not > at all confident in the imap code. > > - Charlie Charlie, if you look at the imap implementation in ruby1.8 and ruby1.9, you'll find that the code(imap.rb) between 2 versions are not so different.but the treading and monitor between 2 versions change a lot. i'm very familiar with the imap code, and i had added IDEL command to ruby imap(ruby1.8) implementaton in my last project. so i think this error is all about threading. > **···** > > -- > Posted via [http://www.ruby-forum.com/\](http://www.ruby-forum.com/%5C).