[asterisk-dev] Asterisk goes Spatial Conferencing: the STEAK project

[Joshua Colp]

On Fri, Nov 25, 2016, at 10:20 AM, Dennis Guse wrote:
> Hey guys,
> 
> we continued working on our largest changeset: https://gerrit.
> asterisk.org/#/c/3524/
> Besides the copyright of HRTFs (still under investigation from our side),
> the only issue on our side is the introduced `settings_lock` (defined in
> bridge.h:254).
> This lock is used in addition to the bridge-lock in bridge_softmix:1093.
> 
> The issue the settings_lock solves is that during bridge startup
> (actually
> `softmix_mixing_thread()`) we need to know the configuration parameters
> (is
> binaural active or not?).
> Since the startup of the mixing thread and parsing the configuration is
> asynchronous (at least our understanding: we saw race conditions), we use
> the 2nd lock to wait until configuration information is available before
> really starting the mixing thread.
> We could avoid introducing the settings_lock by repeatedly checking in
> the
> mixing loop.
> However, this doesn't sound like a good idea...
> Thus, a bridge now has two locks (ast_bridge_lock and the settings_lock),
> which is some overengineering.
> 
> Is there a better solution to addressing this issue?

While I don't yet have an answer for this I've poked others and am
pondering options myself.

-- 
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org