[Freeswitch-dev] Possible bug in mod_conference.c

Brian West brian at freeswitch.org
Mon Feb 22 07:29:51 PST 2010

Please open a jira http://jira.freeswitch.org


On Feb 22, 2010, at 8:45 AM, Peter Fowler wrote:

> In revision 16249 I am seeing an intermittent problem as follows:
> 1) conference is setup to play an alone sound and moh 
> 2) first person calls into the conference 
> 3) very intermittently the "alone" sound if not heard. Instead moh is played immediately
> I have tracked this down to a race condition in mod_conference where the line 1011 within 
> conference_thread_run() checks the value of conference->async_fnode at the same time, on 
> a separate thread, conference_add_member() is updating that value via conference_play_file.
> As a result, intermittently, the alone sound is enqueued but then immediately "over written" 
> by the moh found.
> A possible solution would be to surround the if statement at 1011 with
> switch_mutex_lock(conference->mutex) 
>> switch_mutex_unlock(conference->mutex)
> Let me know if I should go ahead and enter a Jira and post a patch.
> Peter

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