Atomic operations not multi-thread aware

Atomic operations not multi-thread aware

[Joël Krähemann]

Hi, please take a a look at gsequencer.org especially at:

libags-audio
* http://gsequencer.org/api/ags/ags-AgsPort.html

gsequencer
 * http://gsequencer.org/api/ags/ags-AgsLineMember.html

I can crash my application while modifying values of the LADSPA plugin
assigned dial widget what uses atomic operations and a task engine ...

Where can me read about state of Atomic Operations of linux or glibc?
Me doing further investigation.

bests
Joël
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Re: Atomic operations not multi-thread aware

[Joël Krähemann]

Hi, further informations:

http://linuxfromscratch.org
http://minos-one.org/downloads/minos-one_v1.3.iso - WARNING includes
bash bug! Note for best stability you have to dd the live DVD to
hard-disk drive.

linux kernel 3.14.25-rt22
gcc (GCC) 4.9.2

bests
Joël

On Sun, Mar 29, 2015 at 2:52 PM, Joël Krähemann <weedlight@gmail.com> wrote:
> Hi, please take a a look at gsequencer.org especially at:
>
> libags-audio
> * http://gsequencer.org/api/ags/ags-AgsPort.html
>
> gsequencer
>  * http://gsequencer.org/api/ags/ags-AgsLineMember.html
>
> I can crash my application while modifying values of the LADSPA plugin
> assigned dial widget what uses atomic operations and a task engine ...
>
> Where can me read about state of Atomic Operations of linux or glibc?
> Me doing further investigation.
>
> bests
> Joël
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Re: Atomic operations not multi-thread aware

[Clemens Ladisch]

Joël Krähemann wrote:
> I can crash my application while modifying values of the LADSPA plugin
> assigned dial widget what uses atomic operations and a task engine ...

Atomic operations are thread-safe by definition.

However, plugin functions might not be.  The LADSPA spec does not say
anything about it, so I guess you have to serialize all accesses.

And what does this have to do with ALSA?


Regards,
Clemens
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel