notbob wrote:

>The phrase "real time" has always baffled me. Thank you for
>clarifying the concept in such an easily understood and concise
>manner.

There is some good information on this online: Go to
www.google.com and search on the phrase [ real time ].
http://www.google.com/search?q=real+time

The seconfd result on the first page is a Wikipedia entry
on real-time computing:
http://en.wikipedia.org/wiki/Real-time_computing

Which explains the concept, and has a link to the Wikipedia
enty on real-time operating systems:
http://en.wikipedia.org/wiki/Real-time_operating_system

So why does this matter to those who are not electrical
engineers or embedded systems programmers? Because the
maintainers of the Linux Kernel added enhancements to
the Linux 2.6 kernel:

Linux-Kernel Archive: [ANNOUNCE] Linux 2.6 Real Time Kernel
http://www.uwsg.iu.edu/hypermail/lin...10.1/0322.html
http://archives.free.net.ph/message/....3f7dbc09.html

Linux Kernel Goes Real-Time
http://linux.slashdot.org/article.pl...32244&from=rss

This gives the ordinary Slackware user many of the advantages
that were previously only available to RTOS users.

Also See:
Comparing real-time Linux alternatives
http://www.linuxdevices.com/articles/AT4503827066.html


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On Thu, 12 Jul 2007 20:01:12 +0000, Guy Macon wrote:

>
>
>
> notbob wrote:
>
>>The phrase "real time" has always baffled me. Thank you for clarifying
>>the concept in such an easily understood and concise manner.
>
> There is some good information on this online: Go to www.google.com and
> search on the phrase [ real time ].
> http://www.google.com/search?q=real+time
>
> The seconfd result on the first page is a Wikipedia entry on real-time
> computing:
> http://en.wikipedia.org/wiki/Real-time_computing
>
> Which explains the concept, and has a link to the Wikipedia enty on
> real-time operating systems:
> http://en.wikipedia.org/wiki/Real-time_operating_system
>
> So why does this matter to those who are not electrical engineers or
> embedded systems programmers? Because the maintainers of the Linux Kernel
> added enhancements to the Linux 2.6 kernel:


No, if you had a professional qualification or were educated to degree
level in one of the sciences you'd know that real time operating systems
are used in many more fields than just "electrical engineering".

Posts with the string "datemas.de" in the Message-ID or References
now killfiled. I recommend that others do the same and also post
killfile strings until the troll runs out of anonymous remailers.

--
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/\ \/_/\ \/_/\ \/_/\ \/_/\ \/_/\ \/_/\ \/_/\ \/_/\ \__
\ \___\ \___\ \___\ \___\ \___\ \___\ \___\ \___\ \___\
/ / __/ / __/ / __/ / __/ / __/ / __/ / __/ / __/ / __/
\/_/\ \/_/ \/_/ \/_/ \/_/ \/_/ \/_/ \/_/\ \/_/\ \__
\ \___\ \___\ \ \___\ \___\
/ / __/ / __/ Guy Macon, EE & Project / / __/ / __/
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/ / __/ / __/ / __/ / __/ / __/ / __/ / __/ / __/
\/_/ \/_/ \/_/ \/_/ \/_/ \/_/ \/_/ \/_/

Henrik Carlqvist wrote:

>A process with a real time priority will keep the
>CPU until it gives away the CPU by its own will or until another process
>with a higher real time priority needs the CPU. All processes with normal
>priorities will work as before with preemptive multitasking, but the
>normal processes will only get any CPU if it isn't needed by any real time
>process.
>
>Such real time processes can hang the entire machine if they get stuck in
>an infinite loop. Unless the computer has more CPUs than working real time
>processes there will be no CPU left to handle mouse movements, terminals
>or ssh daemons. Because of this you will need root privileges to set those
>priorities.

The above is an excellent description of what happens when a non
real-time OS is handed a process that is labeled "real time" and
told not to interupt it. If the process finishes quickly and
isn't much of a resource hog, this can be an effective strategy,
but as you pointed out, if it hangs you are hosed. A Real-Time
Operating System is designed to avoid such problems, and will
meet the deadlines on all processes.


>--
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>Guy Macon www.guymacon.com Guy Macon <http://www.guymacon.com/> Guy Macon
>www.guymacon.com Guy Macon <http://www.guymacon.com/> Guy Macon guymacon
>Guy Macon <http://www.guymacon.com/> Guy Macon www.guymacon.com Guy Macon
>

Responding to Guy Macon...
>
>
>
> Posts with the string "datemas.de" in the Message-ID or References
> now killfiled. I recommend that others do the same and also post
> killfile strings until the troll runs out of anonymous remailers.
>

Done. Cheers.

--
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Guy Macon, who pretends to be an Electrical Engineer, trolled:

>The seconfd result on the first page is a Wikipedia entry on
>real-time computing:
>http://en.wikipedia.org/wiki/Real-time_computing

>Which explains the concept, and has a link to the Wikipedia enty on
>real-time operating systems:
>http://en.wikipedia.org/wiki/Real-time_operating_system

Good thing you found those links. Now let us know if you need help
understanding it, ok?

http://www.guymacon.com

Heard about the famous Macon Interrupt? If you slap his belly he
farts, in real-time.

>So why does this matter to those who are not electrical engineers
>or embedded systems programmers?

Why are you talking about engineers and embedded systems
programmers? You are _not_ an engineer. You are a handyman at
best. And installing freedos on a 20 year old laptop does not count
as "embedded systems programming."

And why are you shamelessly promoting your own ignorance by putting
your name in the subject line? Aren't you worried that someone will
read this stuff?


cordially, as always,

rm

anon <anon@nowhere.com> trolled:
>On Thu, 12 Jul 2007 20:01:12 +0000, Guy Macon wrote:

>> So why does this matter to those who are not electrical engineers
>> or embedded systems programmers? Because the maintainers of the
>> Linux Kernel added enhancements to the Linux 2.6 kernel:

>No, if you had a professional qualification or were educated to
>degree level in one of the sciences you'd know that real time
>operating systems are used in many more fields than just
>"electrical engineering".

We're surprised to learn that he even knows what to google for.

cordially, as always,

rm

On Thu, 12 Jul 2007 20:30:22 +0000, Guy Macon wrote:

> The above is an excellent description of what happens when a non
> real-time
> OS is handed a process that is labeled "real time" and told not to
> interupt it. If the process finishes quickly and isn't much of a resource
> hog, this can be an effective strategy, but as you pointed out, if it
> hangs you are hosed. A Real-Time Operating System is designed to avoid
> such problems, and will meet the deadlines on all processes.

This all strangely sounds like DOS ;-|

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Replace borg with net

Guy Macon <http> wrote:
>
>
> There is some good information on this online: Go to

What is with the "Guy Macon on" prefix to the subject? Just
label it OT or something. We can clearly see who is making the
post.

- Kurt

Ron Gibson wrote:

>> hangs you are hosed. A Real-Time Operating System is designed to avoid
>> such problems, and will meet the deadlines on all processes.
>
> This all strangely sounds like DOS ;-|

Yeah. I probably does in the case that the term "all processes" resolves
to a single one.

Regards,

Kees.

--
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