[Freeswitch-dev] FreeSWITCH Windows Crash due to Detached Threads (and solution)

Giovanni Maruzzelli gmaruzz at celliax.org
Sun Feb 15 09:30:36 PST 2009

Hi Ron,

don't know if it's always like that, but I can confirm I had to use
joinable thread for Skypiax to have a reliable "killability" without
crashes on Windows (on the Debug build, not cheked on Release).


Giovanni Maruzzelli
via Pierlombardo 9, 20135 Milano
gmaruzz at celliax dot org
Cell : +39-347-2665618
Fax : +39-02-87390039

On Sun, Feb 15, 2009 at 3:49 PM, Ron Avriel <ravriel_1 at yahoo.com> wrote:
> Hi,
> Under Windows, FreeSWITCH consistently crashes with all default install
> setting after issuing the 'shutdown'
> command from console immediately after startup, without a single call
> handled.
> Note that on my servers, this only happens in 'Release' version, not in
> 'Debug'.
> The problem is due to "problematic" Windows thread handling.
> I noticed that all FS threads are 'detachable' and not 'joinable'. When an
> application with active detached threads terminates, a race condition can
> lead to the application crash, as shown in the sample application
> at http://pastebin.freeswitch.org/7225 .
> This is exactly what causes FS to crash as a result of the mod_event_socket
> detached runtime thread.
> A temporary workaround is to change in switch_loadable_module_exec() the
> call to
> switch_yield(1000000) with switch_thread_exit(thread, 0).
> In my case it solved the crash, but theoretically it does not always solve
> the problem, because there is no
> guarantee that it will get called before the main thread reaches its
> termination code.
> I think the only safe solution is to use 'joinable' threads. Is there a good
> reason they're not used?
> Note – this problem was reported to jira about a month ago
> http://jira.freeswitch.org/browse/MODEVENT-37 but it seems it was ignored.
> Thanks,
> Ron
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