[Zope-Coders] Re: Strange segfault in Python threads and linux kernel 2.6

[Derrick Hudson]

On Wed, Jan 19, 2005 at 04:16:09PM +1100, Donovan Baarda wrote:
[...]

| After googling around, I found references to recent attempts to resolve
| some signal handling problems in Python threads. There was one post that
| mentioned subtle differences between how Linux 2.4 and Linux 2.6 did
| signals to threads.
| 
| So it seems this is a problem with Python threads and Linux kernel 2.6.

Maybe this information will help you :

    http://marc.theaimsgroup.com/?l=vim-dev&;m=100827301719235&w=2
    http://marc.theaimsgroup.com/?l=vim-dev&;m=100803941216634&w=2
    http://lists.debian.org/debian-user/2002/12/msg03171.html


    Quoting the last paragraph of section 6.6 of "Programming with
    POSIX Threads" by David R. Butenhof:

        It is always best to avoid using signals in conjunction
        with threads.  At the same time, it is often not possible or
        practical to keep them separate.  When signals and threads
        meet, beware.  If at all possible, use only pthread_sigmask
        to mask signals in the main thread, and sigwait to handle
        signals synchronously within a single thread dedicated to
        that purpose.  If you must use sigaction (or equivalent) to
        handle synchronous signals (such as SIGSEGV) within threads,
        be especially cautious.  Do as little work as possible within
        the signal-catching function.


Good luck!

-D

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