Backport #3779
closedThreading issues on Debian GNU/kFreeBSD
Description
=begin
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.
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