[Freeswitch-users] shared memory pools

[Anthony Minessale]

We still try to avoid using pools from different threads.  When its done
its only done on a second hand context, eg.. uuid_setvar  Since Sessions
have their own pool, and uuid_setvar is used from another thread, the only
solution is to use mutexes.  That is why the patch we added is designed to
activate mutex mode only when needed which we do need in FreeSWITCH.  You
could go on to ask him in your thread if you wish why they have not
commented on our patch that has been submitted for several years now to get
the few patches we have into main APR so we don't have to use our own.  We
have tried to explain it to them a few times and usually the answer is:
meh!  and its dismissed.

I would argue that FreeSWITCH gets its fair share of heavy use and has a
reputation for scalability.  This is all done with mutexed pools so its
clearly not the end of the world to do it.

The final result is we are forced to use our own copy to make sure we get
the functionality we need.




On Tue, Jan 17, 2017 at 10:12 AM, Michael Jerris <mike at jerris.com> wrote:

> We have no plans to make major changes in this space.
>
> On Jan 17, 2017, at 8:10 AM, Sergey Safarov <s.safarov at gmail.com> wrote:
>
> This questions for FS core developers.
> I found that FreeSwitch apr libs have apr_pool_mutex_set that not exists
> in APR master.
> I found commit
> <https://freeswitch.org/stash/projects/FS/repos/freeswitch/commits/ffb1cb4f690473af696fe1fe3879790fe49acecb>
> where this function is introduced.
> Purpose of this commit is resolve concurrency access from different
> threads to same memory pool.
>
> I asked
> <http://mail-archives.apache.org/mod_mbox/apr-dev/201701.mbox/%3CCAHtxdDfDwmoACnYn04FTWWgtpK8giJjsgSgg5VvuSN%2Bph4G%3DBw%40mail.gmail.com%3E>
> APR community why not used mutex and got responce from William A Rowe
> <http://mail-archives.apache.org/mod_mbox/apr-dev/201701.mbox/%3CCACsi2539CFJusRo0wmReEEdrdG5ppJsJb-C9aD-g7K6tFos%2BOA%40mail.gmail.com%3E>
>
> My questions
> Does core team developers planning rewrite memory pool operation to remove
> shared access to same pool from different threads? Create own pool for each
> thread.
>
> Sergey
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-- 
Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬

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