[alsa-devel] pcm write from posix threads
tiwai at suse.de
Wed Aug 20 10:11:01 CEST 2008
At Tue, 19 Aug 2008 17:24:06 -0500,
Brian Rhodes wrote:
> When calling snd_pcm_write* from a thread how do you safely cancel the
> thread? I've tried masking the signals which are used in alsa lib, yet
> I am getting a segfault on pthread_exit(). My thread is looping doing
> the following.
> I am checking return values to handle those functions being woken up by
> pthread cancel and attempting to exit. In testing the process it
> performs fine until I start actually writing data. Once I write some
> data, a pthread_exit will segfault. My cancellation routine is calling
> snd_pcm_drop, then doing a cancel followed by join.
No, alsa-lib functions don't care threads in general.
Some codes have uses pthread_mutex, but not in the PCM core code, at
You need to handle and protect threads by yourself.
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