Re: [LAD] a *simple* ring buffer, comments pls? | Linuxaudio.org

Re: [LAD] a simple ring buffer, comments pls?

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From: Arnold Krille <arnold@...>

To: <linux-audio-dev@...>

Subject: Re: [LAD] a *simple* ring buffer, comments pls?

Date: Monday, July 11, 2011 - 10:12 pm

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On Monday 11 July 2011 23:15:26 Tim E. Real wrote:

quoted text

> On July 11, 2011 04:50:06 pm Chris Cannam wrote:
> > I know taking locks in a RT process is deeply frowned upon
>=20
> Likely been answered before, but good time for me to ask:
> What is the reason it is not recommended?
> Is it simply because of a long time involved in acquiring the lock, or is
> it because the lock might block some other Jack thread from running?
> The same reason why other things like 'malloc' or 'new' are not
> recommended either?

Real-time means "as fast as possible". Waiting to acquire a lock isn't exac=
tly=20
what you would call "fast"...
Waiting for a lock is the same as waiting for the kernels/OSs memory managm=
ent=20
to allocate some space.

Have fun,

Arnold

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Messages in current thread:

[LAD] a *simple* ring buffer, comments pls?, James Morris, (Thu Jul 7, 12:10 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, James Morris, (Fri Jul 8, 12:51 am)

Re: [LAD] a *simple* ring buffer, comments pls?, James Morris, (Fri Jul 8, 11:24 am)

Re: [LAD] a *simple* ring buffer, comments pls?, Paul Davis, (Fri Jul 8, 1:22 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Fons Adriaensen, (Fri Jul 8, 5:17 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Gabriel M. Beddingfield, (Fri Jul 8, 6:12 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Arnold Krille, (Fri Jul 8, 7:06 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Fons Adriaensen, (Fri Jul 8, 7:53 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Paul Davis, (Fri Jul 8, 8:41 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Fons Adriaensen, (Fri Jul 8, 9:01 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Arnold Krille, (Fri Jul 8, 8:59 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Fons Adriaensen, (Fri Jul 8, 9:11 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Muresan, (Fri Jul 8, 7:23 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Muresan, (Mon Jul 11, 6:59 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Fons Adriaensen, (Mon Jul 11, 8:53 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Muresan, (Tue Jul 12, 5:41 am)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Kegel, (Fri Jul 8, 7:29 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Paul Davis, (Fri Jul 8, 8:49 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Sean Bolton, (Fri Jul 8, 9:57 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Muresan, (Fri Jul 8, 11:03 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Fons Adriaensen, (Fri Jul 8, 11:27 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Muresan, (Sat Jul 9, 1:25 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Fons Adriaensen, (Sat Jul 9, 2:38 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Muresan, (Sun Jul 10, 3:05 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Fons Adriaensen, (Sun Jul 10, 9:15 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Muresan, (Mon Jul 11, 12:03 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Fons Adriaensen, (Mon Jul 11, 8:44 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Kegel, (Sun Jul 10, 10:34 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Paul Davis, (Sun Jul 10, 9:41 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Sean Bolton, (Mon Jul 11, 1:34 am)

Re: [LAD] a *simple* ring buffer, comments pls?, Sean Bolton, (Mon Jul 11, 1:44 am)

Re: [LAD] a *simple* ring buffer, comments pls?, Olivier Guilyardi, (Mon Jul 11, 7:19 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, James Morris, (Mon Jul 11, 8:32 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Chris Cannam, (Mon Jul 11, 8:50 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Tim E. Real, (Mon Jul 11, 9:38 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Robin Gareus, (Mon Jul 11, 10:27 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Arnold Krille, (Mon Jul 11, 10:12 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Robin Gareus, (Mon Jul 11, 10:28 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Paul Davis, (Mon Jul 11, 10:34 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Mills, (Mon Jul 11, 10:24 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Fons Adriaensen, (Mon Jul 11, 10:06 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Olivier Guilyardi, (Mon Jul 11, 11:06 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Muresan, (Mon Jul 11, 10:17 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Paul Davis, (Mon Jul 11, 8:58 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Chris Cannam, (Tue Jul 12, 7:07 am)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Muresan, (Tue Jul 12, 12:44 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Kai Vehmanen, (Wed Jul 20, 9:25 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Emanuel Rumpf, (Sat Aug 20, 6:24 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Emanuel Rumpf, (Sat Aug 27, 7:21 am)

Re: [LAD] a *simple* ring buffer, comments pls?, Gabriel Beddingfield, (Sat Aug 20, 7:16 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Chris Cannam, (Tue Jul 12, 7:46 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Olivier Guilyardi, (Tue Jul 12, 8:20 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Arnold Krille, (Tue Jul 12, 11:31 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Paul Davis, (Tue Jul 12, 11:56 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Olivier Guilyardi, (Wed Jul 13, 12:27 am)

Re: [LAD] a *simple* ring buffer, comments pls?, Chris Cannam, (Tue Jul 12, 9:07 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Olivier Guilyardi, (Tue Jul 12, 9:26 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Paul Davis, (Tue Jul 12, 8:36 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Olivier Guilyardi, (Tue Jul 12, 9:32 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Kegel, (Tue Jul 12, 10:23 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Olivier Guilyardi, (Tue Jul 12, 11:50 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Fred Gleason, (Wed Jul 13, 12:08 am)

Re: [LAD] a *simple* ring buffer, comments pls?, Olivier Guilyardi, (Wed Jul 13, 12:25 am)

Re: [LAD] a *simple* ring buffer, comments pls?, Chris Cannam, (Tue Jul 12, 9:37 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Olivier Guilyardi, (Tue Jul 12, 10:00 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Chris Cannam, (Tue Jul 12, 9:16 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Emanuel Rumpf, (Tue Jul 12, 5:20 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Chris Cannam, (Mon Jul 11, 8:50 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, David Olofson, (Mon Jul 11, 8:47 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Dan Kegel, (Fri Jul 8, 9:52 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Fons Adriaensen, (Fri Jul 8, 6:39 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, James Morris, (Fri Jul 8, 12:21 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Olivier Guilyardi, (Fri Jul 8, 12:56 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, Gabriel M. Beddingfield, (Fri Jul 8, 1:04 am)

Re: [LAD] a *simple* ring buffer, comments pls?, David Robillard, (Fri Jul 8, 2:23 pm)

Re: [LAD] a *simple* ring buffer, comments pls?, James Morris, (Fri Jul 8, 8:45 am)

Re: [LAD] a *simple* ring buffer, comments pls?, James Morris, (Fri Jul 8, 8:40 am)