Re: [LAD] Realtime threads and security

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To: Robin Gareus <robin@...>
Cc: <linux-audio-dev@...>
Date: Wednesday, February 23, 2011 - 10:22 am

Hi,

On 02/17/2011 10:53 PM, Robin Gareus wrote:

> /proc/sys/kernel/sched_rt_runtime_us

There's something which confuses me. But I'm not sure how this realtime period
settings relate to the audio I/O period.

On Android, the closest that one can get to hardware in a more or less portable
way is libaudio [1]. It's Android's audio HAL. This API exposes blocking read()
and write() calls, with fixed buffer sizes (input and output buffer sizes
generally do not match, but that's another problem).

So, this may be a silly/newbie question, but can one access this blocking API
from a realtime thread? What will happen when it blocks? How does the read/write
period relate to sched_rt_period_us?

[1] http://source.android.com/porting/audio.html

--
Olivier
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Messages in current thread:
[LAD] Realtime threads and security, Olivier Guilyardi, (Thu Feb 17, 8:40 pm)
Re: [LAD] Realtime threads and security, Daniel Poelzleithner, (Fri Feb 18, 1:43 pm)
Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Wed Feb 23, 10:10 am)
Re: [LAD] Realtime threads and security, Daniel Poelzleithner, (Wed Feb 23, 5:24 pm)
Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Fri Feb 25, 3:23 pm)
Re: [LAD] Realtime threads and security, Paul Davis, (Fri Feb 25, 3:29 pm)
Re: [LAD] Realtime threads and security, torbenh, (Fri Feb 25, 3:56 pm)
Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Fri Feb 25, 3:54 pm)
Re: [LAD] Realtime threads and security, Paul Davis, (Fri Feb 25, 4:32 pm)
Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Fri Feb 25, 4:40 pm)
Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Fri Feb 25, 4:31 pm)
Re: [LAD] Realtime threads and security, Paul Davis, (Fri Feb 25, 4:33 pm)
Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Fri Feb 25, 4:49 pm)
Re: [LAD] Realtime threads and security, Paul Davis, (Fri Feb 25, 4:54 pm)
Re: [LAD] Realtime threads and security, Paul Davis, (Thu Feb 17, 8:48 pm)
Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Thu Feb 17, 9:27 pm)
Re: [LAD] Realtime threads and security, Robin Gareus, (Thu Feb 17, 9:54 pm)
Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Wed Feb 23, 10:22 am)
Re: [LAD] Realtime threads and security, Robin Gareus, (Wed Feb 23, 7:28 pm)
Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Thu Feb 24, 2:59 pm)
Re: [LAD] Realtime threads and security, Robin Gareus, (Thu Feb 24, 6:01 pm)
Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Thu Feb 24, 7:09 pm)
Re: [LAD] Realtime threads and security, Fons Adriaensen, (Thu Feb 17, 10:04 pm)
Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Fri Feb 18, 12:17 pm)
Re: [LAD] Realtime threads and security, torbenh, (Fri Feb 18, 11:19 am)
Re: [LAD] Realtime threads and security, Paul Davis, (Thu Feb 17, 9:55 pm)