[alsa-devel] [alsa-lib] Query regarding snd_config_update_free_global() and threads etc.
gmane at colin.guthr.ie
Mon Aug 23 17:49:54 CEST 2010
'Twas brillig, and Jaroslav Kysela at 23/08/10 16:13 did gyre and gimble:
> On Mon, 23 Aug 2010, Colin Guthrie wrote:
>> Hi there,
>> I've got a (hopefully quick) query about snd_config_update_free_global()
>> and it's general thread safetyness.
>> I'm currently going insane on this bug:
>> which revolves around a bug manifested in snd_pcm_close() (or rather
>> snd_pcm_ioplug_close()) when dealing with the ALSA->PulseAudio plugin.
>>> From what I can gather, this problem is related to a KDE module that is
>> loaded into the library in question which does some alsa probing and
>> ultimately calls snd_config_update_free_global() several times. The
>> library itself then goes on to use GStreamer to do actual audio output.
>> The crash then manifests itself prior to any sound actually being output.
>> I can reliably reproduce the machine on two machines (I don't have many
>> at my disposal), but cannot reproduce on a third. The two I can
>> reproduce it on are two and four core intel duo's. The one I cannot
>> reproduce on is an older, single core machine. I am leaning towards some
>> kind of thread safety issue.
>> In searching for similar problems, I found several references to similar
>> crashes attributed to snd_dlobj_cache_cleanup() perhaps not being thread
> I tried to work on snd_dlobj_cache issues. Please, could you test this
Sure, will try and do so this evening and report back. Thanks!
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