Forum: Ruby-core [Ruby 1.8-Bug#3779][Open] Threading issues on Debian GNU/kFreeBSD

Bug #3779: Threading issues on Debian GNU/kFreeBSD
http://redmine.ruby-lang.org/issues/show/3779

Author: Lucas Nussbaum
Status: Open, Priority: Normal
ruby -v: 1.8.7

Due to incorrect assumptions on sigprocmask in threaded programs, ruby 
1.8 doesn't work well on Debian GNU/kFreeBSD (FreeBSD kernel + GNU 
Libc).
This was already fixed in Ruby 1.9.

- in process.c (re-)start timer thread (after_exec) only in parent,
  as in child we know for sure that there is only one thread.
  The fix-up in child is performed slightly later in rb_thread_atfork().
  Also unify linux with rest of the systems.
  In 1.9 series the code is completely reworked.

- in signal.c use pthread_sigmask instead of sigprocmask,
  behaviour of sigprocmask is undefined in threaded programs, as stated 
in POSIX
  (http://www.opengroup.org/onlinepubs/9699919799/functions/pthread_sigmask.html).
  In 1.9 series the code already uses pthread_sigmask:

  Sat Apr 24 00:41:52 2010  Yusuke Endoh  <mame@tsg.ne.jp>

        * signal.c: use pthread_sigmask() instead of sigprocmask().
          sigprocmask() is unspecified behavior on multi-thread 
programs.
          [ruby-core:25217]

For more information, see 
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=595034

Patch attached. The signal.c part is hackish, and should be done 
properly in configure.

Please also backport to 1.8.7.