[alsa-devel] [PATCH alsa-lib v2 0/3] PCM thread-safety patchset

[Takashi Iwai]

On Thu, 07 Jul 2016 16:40:10 +0200,
Takashi Iwai wrote:
> 
> Hi,
> 
> here is a v2 patchset for supporting multi thread safety to alsa-lib
> PCM API.  Now it's out from RFC and should be reviewed as an official
> patchset.
> 
> Basically ALSA PCM functions are thread-unsafe, and applications are
> supposed to do the proper protection against racy accesses.  The
> reality is, however, that application developers don't care such, as
> alsa-lib works in most cases.  Of course, users still get occasionally
> mysterious crashes.
> 
> As a workaround, this patchset adds the pthread mutex protection to
> most of exported PCM functions.  This is slightly an overkill, but the
> biggest merit is that it's easy to implement; I just wrapped the
> functions and replaced the internal ones with unlocked versions.
> 
> To be noted, there is an optimization for the direct hw PCM access.
> Performance-sensitive applications like JACK should work like before
> without any overhead.
> 
> Another bonus by this addition is that we can finally get rid of home
> brew (and deadly smelling) atomic macros from the tree, since it's now
> more widely protected.
> 
> I lightly tested on my local machines (dmix, PA, jack and plugins) and
> all seem working well, so far.

As there's been no objection, I pushed this patchset now.
Let me know if this gives any regression.


thanks,

Takashi