At Mon, 12 Nov 2012 19:40:42 +0000 (UTC), Rob Krakora wrote:
Jaroslav Kysela <perex <at> perex.cz> writes:
Date 10.11.2012 14:53, Takashi Iwai wrote:
At Fri, 9 Nov 2012 18:03:25 -0800, Trent Piepho wrote:
We've found a race with alsa-lib functions are called from multiple threads. I was under the impression that alsa-lib was supposed to be thread safe. Is this not the case and all alsa calls should be done one from thread or protected by a mutex?
Yes. alsa-lib isn't thread-safe.
The alsa-lib is designed to be thread safe but the calls for one handle (PCM, control, rawmidi etc.) should be serialized using mutexes in apps. Or basically, it's assumed that one thread will maintain one handle.
This should be documented somewhere.
JaroslavHi Jaroslav,
Would you be able to point me the the ALSA documentation that indicates the stipulations on handle usage using multiple threads? I cannot find it.
Think other way round: The fact that it isn't documented means it's not safe to use in that way :)
Takashi