[#51213] [ruby-trunk - Bug #7645][Open] BigDecimal#== slow when compared to true/false — "mathie (Graeme Mathieson)" <mathie@...>

11 messages 2013/01/01

[#51328] [ruby-trunk - Bug #7676][Open] Comparison of Float::NAN in array behaves unexpectedly — "simonrussell (Simon Russell)" <spam+ruby@...>

11 messages 2013/01/09

[#51347] [ruby-trunk - Bug #7679][Open] IRB history is broken — "zzak (Zachary Scott)" <zachary@...>

15 messages 2013/01/10

[#51389] [ruby-trunk - Bug #7688][Open] Error hiding with rb_rescue() on Comparable#==, #coerce and others — "Eregon (Benoit Daloze)" <redmine@...>

34 messages 2013/01/11

[#51430] [ruby-trunk - Bug #7696][Open] Lazy enumerators with state can't be rewound — "marcandre (Marc-Andre Lafortune)" <ruby-core@...>

15 messages 2013/01/14

[#51437] [ruby-trunk - Bug #7698][Open] RubyGems 2.0 has an incompatibility about installation of extension libraries — "mrkn (Kenta Murata)" <muraken@...>

21 messages 2013/01/15

[#51454] [CommonRuby - Feature #7701][Open] Non-optional (required) keyword args — "headius (Charles Nutter)" <headius@...>

31 messages 2013/01/15

[#51499] [ruby-trunk - Feature #7712][Open] Add .txt extensions to all plain-text documentation files for Windows users — "postmodern (Hal Brodigan)" <postmodern.mod3@...>

9 messages 2013/01/18

[#51619] [ruby-trunk - Feature #7738][Open] Deprecate Set#+ as an alias of Set#|, use it for symmetric difference. Introduce Hash#| for Hash#reverse_merge in Rails. — "alexeymuranov (Alexey Muranov)" <redmine@...>

11 messages 2013/01/24

[#51623] [ruby-trunk - Feature #7739][Open] Define Hash#| as Hash#reverse_merge in Rails — "alexeymuranov (Alexey Muranov)" <redmine@...>

24 messages 2013/01/24

[#51714] [CommonRuby - Feature #7747][Open] Expanded API for Binding semantics — "jballanc (Joshua Ballanco)" <jballanc@...>

19 messages 2013/01/27

[#51742] [ruby-trunk - Bug #7756][Open] clang 3.2 sees through UNINITIALIZED_VAR macro, gives warning — "drbrain (Eric Hodel)" <[email protected]>

10 messages 2013/01/29

[#51763] [ruby-trunk - Bug #7758][Open] Ruby on Windows crashes when active codepage is codepage 65001 and outputting unicode character — "joshc (Josh C)" <josh.nw@...>

16 messages 2013/01/30

[ruby-core:51632] [ruby-trunk - Bug #7720] Process.daemon does not clean up background Ruby threads, leading to hang at exit

From: "ko1 (Koichi Sasada)" <redmine@...>
Date: 2013-01-25 03:08:13 UTC
List: ruby-core #51632
Issue #7720 has been updated by ko1 (Koichi Sasada).


Does this issue remain on trunk?
(Should we modify trunk before 2.0?)

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Bug #7720: Process.daemon does not clean up background Ruby threads, leading to hang at exit
https://bugs.ruby-lang.org/issues/7720#change-35593

Author: benweint (Ben Weintraub)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 1.9.3p327 (2012-11-10 revision 37606) [x86_64-darwin12.2.0]


Process.fork appears to make special considerations for Ruby background threads so that they are cleaned up in the child process after fork (since fork() only duplicates the calling thread). Process.daemon also relies on fork internally, but does not make the same considerations, leading to a hang at exit in a daemonized process that had multiple Ruby threads prior to calling Process.daemon.

The attached daemon.rb demonstrates the issue. It will call either Process.daemon (default) or Process.fork (if you pass 'fork' as the first arg).

If you pass nothing, causing it to call Process.daemon, the daemonized Ruby process will still think it has two threads, and will hang indefinitely on exit, in a loop in rb_thread_terminate_all. If you pass 'fork' as the first argument, the forked child does not hang, and appears to have only one Ruby thread (the one that called Process.fork).

It looks like rb_thread_atfork() is the relevant call in the fork case that makes this work, but it doesn't appear to be called in the daemon case.


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