On Mon, 3 Dec 2001, Abramo Bagnara wrote:
Jaroslav Kysela wrote:
On Mon, 3 Dec 2001, Alexander Ehlert wrote:
Hi,
can it be, that snd_pcm_open in the alsa lib is not threadsafe?
You're right, the snd_config_update() function is not thread safe (it uses
global variables). I put this item to the todo list.
Glame uses threads for all its plugins and if I have for example
one audio_in and one audio_out plugin, it can happen, that
snd_pcm_open is called twice at the same time. Wonderful things
happen in snd_config_expand and glame can't open any audio devices
with alsa for a running session. Putting mutexes around snd_pcm_open
fixes the problem. Are there any other functions in the alsa lib
that are potentially not thread safe?
Other functions should be thread safe (except pcm_share plugin),
Why you say that? pcm_share has been written with multithreading in
mind.
I've missed something?
Nope. It was my bad assumption, that the global list of clients is not
protected using a mutex. You're right, there shouldn't be any problem with
pcm_share.
Jaroslav
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Jaroslav Kysela [EMAIL PROTECTED]
SuSE Linuxhttp://www.suse.com
ALSA Project http://www.alsa-project.org
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