[alsa-devel] Closing alsa devices after forking off children

Werner Van Belle werner at yellowcouch.org
Fri Mar 27 17:13:24 CET 2009


I'm currently trying to figure out why a close of the alsa device is not
realized 'quickly'. That is it seems to take 2 to 3 seconds before I can
reopen the device in anopther program. After observing this behavior
somewhat I figured out that opening an alsa device and then forking off
a process will keep the alsa device open until the child dies, even when
the parent process closes the alsa device.

Is this behavior known and if so how can I work around this ?

I tried to use pthread_atfork to close the device in the forked off
child, but that closes the device in the parent process as well, so I
would rather want to unlink the device in such a way that the close call
does not need to wait until all children have given up their handle.

With kind regards,

Dr. Werner Van Belle

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