Thanks for reassuring me that there isn't some sort of incompatibility with alsa lib and threading. I am not able to reproduce the issue on an x86 system and it only seems to happen when built with a specific toolchain for ARM.
Takashi Iwai wrote:
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.
testcancel snd_pcm_wait snd_pcm_avail snd_pcm_writei
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 least.
You need to handle and protect threads by yourself.
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