Fix a crash when a bridge switches from the softmix bridge technology to another.
authorRichard Mudgett <rmudgett@digium.com>
Sat, 8 Jun 2013 05:18:22 +0000 (05:18 +0000)
committerRichard Mudgett <rmudgett@digium.com>
Sat, 8 Jun 2013 05:18:22 +0000 (05:18 +0000)
commitc88b7945f64ef713da3791e2518608c1e65e90de
tree26e5bf9e5c31678abc43f31da664b439ccfa0d1b
parent661f6d499e9e5c509d09d7775f64625b398143ac
Fix a crash when a bridge switches from the softmix bridge technology to another.

A three party bridge uses the softmix bridging technology.  This
technology has a dedicated thread used to perform the analog mixing.  When
one of these parties leaves the bridge, the bridge technology is changed
from the softmix technology to a two-party mixing technology.  Changing
technologies is done by removing channels from the old technology and
adding them to the new technology.  Since the remaining channels do not
leave the bridge, the softmix mixing thread could continue to process all
channels in the bridge.  If the bridge code is not able to start
destruction of the softmix technology before the softmix mixing thread
wakes up, a crash happens.

* Added a stop technology callback that technologies can use to request
any helper threads to stop in preparation for being destroyed.

(closes issue AST-1156)
Reported by: John Bigelow

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@390975 65c4cc65-6c06-0410-ace0-fbb531ad65f3
bridges/bridge_softmix.c
include/asterisk/bridging_technology.h
main/bridging.c