# The thread problem in ruby imap **URL:** \ **Category:** Ruby\ **Created:** [January 4, 2009, 2:46pm UTC](https://www.ruby-forum.com/t/the-thread-problem-in-ruby-imap/156863 "2009-01-04T14:46:48Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![feeling3\_4](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/ecb155/32.png) [@feeling3\_4](https://www.ruby-forum.com/u/feeling3_4)\ **Post date:** [January 4, 2009, 2:46pm UTC](https://www.ruby-forum.com/t/the-thread-problem-in-ruby-imap/156863/1 "2009-01-04T14:46:48Z")
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! ---
**Author:** ![feeling3\_4](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/ecb155/32.png) [@feeling3\_4](https://www.ruby-forum.com/u/feeling3_4)\ **Post date:** [January 4, 2009, 3:13pm UTC](https://www.ruby-forum.com/t/the-thread-problem-in-ruby-imap/156863/2 "2009-01-04T15:13:33Z")
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:** ![feeling3\_4](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/ecb155/32.png) [@feeling3\_4](https://www.ruby-forum.com/u/feeling3_4)\ **Post date:** [January 5, 2009, 3:27am UTC](https://www.ruby-forum.com/t/the-thread-problem-in-ruby-imap/156863/3 "2009-01-05T03:27:50Z")
Charles Oliver N. 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? ---
**Author:** ![feeling3\_4](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/ecb155/32.png) [@feeling3\_4](https://www.ruby-forum.com/u/feeling3_4)\ **Post date:** [January 5, 2009, 11:39am UTC](https://www.ruby-forum.com/t/the-thread-problem-in-ruby-imap/156863/4 "2009-01-05T11:39:44Z")
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:** ![feeling3\_4](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/ecb155/32.png) [@feeling3\_4](https://www.ruby-forum.com/u/feeling3_4)\ **Post date:** [January 5, 2009, 11:54am UTC](https://www.ruby-forum.com/t/the-thread-problem-in-ruby-imap/156863/5 "2009-01-05T11:54:43Z")
Charles Oliver N. 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.