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Real-time POSIX?
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never-aways
*nix forums Guru


Joined: 21 Feb 2005
Posts: 594

PostPosted: Mon Jun 26, 2006 4:36 pm    Post subject: Real-time POSIX? Reply with quote
Hello,

I would appreciate any information regarding the compliance/conformance of
Linux to the POSIX real-time specifications.

Which distributions or kernel patches do add real-time to the vanilla kernel
those days? How much do they comply with RT POSIX extensions, and with
which ones exactly? Which distros claim hard RT?

Thanks
a.
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Mike T.
*nix forums Guru Wannabe


Joined: 20 Feb 2005
Posts: 245

PostPosted: Tue Jun 27, 2006 2:46 pm    Post subject: Re: Real-time POSIX? Reply with quote
A. Melinte wrote:

Quote:
I would appreciate any information regarding the compliance/conformance of
Linux to the POSIX real-time specifications.

Which distributions or kernel patches do add real-time to the vanilla kernel
those days? How much do they comply with RT POSIX extensions, and with
which ones exactly? Which distros claim hard RT?

I'm not sure, but I think this is a start:
http://www.tglx.de/hrtimers.html

Am I mistaken?
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Roberto Waltman
*nix forums Guru Wannabe


Joined: 21 Feb 2005
Posts: 180

PostPosted: Tue Jun 27, 2006 5:56 pm    Post subject: Re: Real-time POSIX? Reply with quote
"A. Melinte" wrote:
Quote:
I would appreciate any information regarding the compliance/conformance of
Linux to the POSIX real-time specifications.

Which distributions or kernel patches do add real-time to the vanilla kernel
those days? How much do they comply with RT POSIX extensions, and with
which ones exactly? Which distros claim hard RT?

Claiming "some real time", no necessarily "hard":

KURT: http://www.ittc.ku.edu/kurt/
Timesys: http://www.timesys.com
Lynx/Linuxworks: http://www.linuxworks.com
Montavista: http://www.mvista.com/
Montavista: http://source.mvista.com/linux_2_6_RT.html

Information: http://www.realtimelinuxfoundation.org/
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raseelbhagat@gmail.com
*nix forums beginner


Joined: 09 Mar 2006
Posts: 10

PostPosted: Wed Jun 28, 2006 7:50 am    Post subject: Re: Real-time POSIX? Reply with quote
Hi,

A. Melinte wrote:
Quote:
Hello,

I would appreciate any information regarding the compliance/conformance of
Linux to the POSIX real-time specifications.

Which distributions or kernel patches do add real-time to the vanilla kernel
those days? How much do they comply with RT POSIX extensions, and with
which ones exactly? Which distros claim hard RT?

Thanks
a.

RTLinux (Pro), RTLinux Free, RTAI are all hard POSIX compliant
Linux-based OSes.
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Michael Schnell
*nix forums Guru Wannabe


Joined: 21 Feb 2005
Posts: 110

PostPosted: Wed Jun 28, 2006 1:31 pm    Post subject: Re: Real-time POSIX? Reply with quote
Quote:
Which distributions or kernel patches do add real-time to the vanilla kernel
those days? How much do they comply with RT POSIX extensions, and with
which ones exactly? Which distros claim hard RT?

As Linux can't do _hard_ realtime at all, every distro is very far away.
_Soft_ realtime is another thing. A 2.6 Kernel on a CPU that is
appropriately fast for the project in question might be quite good.

AFAIK, Pike OS (a not free add-on to Linux by SysGo) offers a realtime
Posix API.

-Michael
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Ulrich Schwab
*nix forums beginner


Joined: 04 Mar 2005
Posts: 2

PostPosted: Wed Jul 05, 2006 7:43 am    Post subject: Re: Real-time POSIX? Reply with quote
raseelbhagat@gmail.com wrote:

Quote:
Hi,

A. Melinte wrote:
Hello,

I would appreciate any information regarding the compliance/conformance
of Linux to the POSIX real-time specifications.

Which distributions or kernel patches do add real-time to the vanilla
kernel
those days? How much do they comply with RT POSIX extensions, and with
which ones exactly? Which distros claim hard RT?

Thanks
a.

RTLinux (Pro), RTLinux Free, RTAI are all hard POSIX compliant
Linux-based OSes.
RTLinux(Pro) is NOT free.

RTLinux Free is only available for kernel 2.4
A more up to date and free hard RT (even in user space) extension for Linux
kernel 2.4 and 2.6 with several "RT-skins" (e.g.: PSOS, VRTX, POSIX) is
XENOMAI
see: www.xenomai.org
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Google
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