Any system calls OK to use in audio thread?
Any system calls OK to use in audio thread?
- Subject: Any system calls OK to use in audio thread?
- From: Matt Ingalls <email@hidden>
- Date: Mon, 26 Feb 2018 16:06:00 -0800
I have to admit that in the past i’ve done some dubious things inside the audio
thread -- and i’m not proud of it.. ;)
But in some recent C++ work, I'm not letting myself call any function I’m not
absolutely sure is lock-free.
Ross Bencina’s article is still my go-to-reference:
http://www.rossbencina.com/code/real-time-audio-programming-101-time-waits-for-nothing
<http://www.rossbencina.com/code/real-time-audio-programming-101-time-waits-for-nothing>
But now I’m wondering if I’m being too anal...
Could I at least call memcpy and memset?
And although I haven’t used any STL classes, maybe std::array might be safe to
use?
I am however calling some vDSP functions. I assumed they were intended to be
used in real-time threads,
but I actually can’t find anything that confirms this in the documentation - it
does say it uses GCD,
and I seem to recall a WWDC video
https://developer.apple.com/videos/play/wwdc2015/508/?time=2952
<https://developer.apple.com/videos/play/wwdc2015/508/?time=2976>
where Doug Wyatt says you shouldn’t even be calling dispatch_async() in the
audio thread, so I don’t know..??
Any thoughts would be appreciated.
Thanks,
Matt
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