GC asserts and threads

GC asserts and threads

[Han-Wen Nienhuys]

Hi there,

I'm debugging an issue here that cause the GC asserts to trigger,
with the values compared being off by one.  The problem disappears 
when I compile --without-threads. The program does not explicitly
create threads

Is there any code in GUILE that would create a thread  (possibly 
leading to race conditions) when there is no explicit start-thread
call in the code?  The program (lilypond) does run through the 
regular GUILE boot procedure.

-- 
 Han-Wen Nienhuys - hanwen@xs4all.nl - http://www.xs4all.nl/~hanwen

Re: GC asserts and threads

[Andy Wingo]

On Tue 09 Sep 2008 07:58, Han-Wen Nienhuys <hanwen@xs4all.nl> writes:

> Is there any code in GUILE that would create a thread  (possibly 
> leading to race conditions) when there is no explicit start-thread
> call in the code?  The program (lilypond) does run through the 
> regular GUILE boot procedure.

Yep, when compiled with threads, guile spawns a separate thread to
handle signals.

Andy
-- 
http://wingolog.org/

Re: GC asserts and threads

[Han-Wen Nienhuys]

On Tue, Sep 9, 2008 at 4:00 AM, Andy Wingo <wingo@pobox.com> wrote:
> On Tue 09 Sep 2008 07:58, Han-Wen Nienhuys <hanwen@xs4all.nl> writes:
>
>> Is there any code in GUILE that would create a thread  (possibly
>> leading to race conditions) when there is no explicit start-thread
>> call in the code?  The program (lilypond) does run through the
>> regular GUILE boot procedure.
>
> Yep, when compiled with threads, guile spawns a separate thread to
> handle signals.

Where does that happen?

-- 
Han-Wen Nienhuys - hanwen@xs4all.nl - http://www.xs4all.nl/~hanwen

Re: GC asserts and threads

[Han-Wen Nienhuys]

Andy Wingo escreveu:
> On Tue 09 Sep 2008 07:58, Han-Wen Nienhuys <hanwen@xs4all.nl> writes:
> 
>> Is there any code in GUILE that would create a thread  (possibly 
>> leading to race conditions) when there is no explicit start-thread
>> call in the code?  The program (lilypond) does run through the 
>> regular GUILE boot procedure.
> 
> Yep, when compiled with threads, guile spawns a separate thread to
> handle signals.
> 

but I am only seeing one....


$ guile
guile> (all-threads)
(#<thread 3086285552 (8208008)>)

> Andy


-- 
 Han-Wen Nienhuys - hanwen@xs4all.nl - http://www.xs4all.nl/~hanwen

Re: GC asserts and threads

[Neil Jerram]

2008/9/9 Han-Wen Nienhuys <hanwenn@gmail.com>:
> On Tue, Sep 9, 2008 at 4:00 AM, Andy Wingo <wingo@pobox.com> wrote:
>> On Tue 09 Sep 2008 07:58, Han-Wen Nienhuys <hanwen@xs4all.nl> writes:
>>
>>> Is there any code in GUILE that would create a thread  (possibly
>>> leading to race conditions) when there is no explicit start-thread
>>> call in the code?  The program (lilypond) does run through the
>>> regular GUILE boot procedure.
>>
>> Yep, when compiled with threads, guile spawns a separate thread to
>> handle signals.
>
> Where does that happen?

Look for "ensure_signal_delivery_thread" in scmsigs.c.

   Neil