Linux Gains Native RTOS Emulation Layer 89
nerdyH writes to tell us that the Xenomai/SOLO project is attempting to deliver VxWorks and other RTOS emulation for any Linux kernel. "Some weeks ago, I started laying the groundwork for porting the Xenomai emulators natively over the PREEMPT_RT kernel. Unlike the co-kernel based Xenomai version, SOLO does not require any kernel support from additional modules or patches. It is fully based on the standard POSIX library, and runs as a regular process controlled by a single image Linux kernel. As a first step, a VxWorks emulator has just been rebuilt over this new framework."
Re:A quick search reveals (Score:2, Informative)
Re:Realtime, VxWorks, Dolla Dolla Bill Yall (Score:5, Informative)
Any normal distro Linux kernel can do this particular part. Just set the scheduler to round robin. (You can do this in KDE4 btw. Press ctrl-esc to bring up the task manager, right click a process, change priority, and chose round robin.)
Re:A quick search reveals (Score:5, Informative)
I had to power cycle my machine to shut it down as it managed to completely saturate the machine.
As far as I can tell it:
1. Tried to log me onto a gay porn site
2. Tried to open up IRC and do something (failed, luckily, since osx won't let such things happen automatically.. my screen just filled boxes asking if I wanted to start colloquy)
3. Tried to run a
I reckon if you clicked that button on a windows machine you'd be crying right now - and your passwords would be all over IRC too...
Re:A quick search reveals (Score:3, Informative)
But then, who in is right mind would admit on
Re:Realtime, VxWorks, Dolla Dolla Bill Yall (Score:5, Informative)
Have you tried QNX or RTEMS? I don't have any data on their scheduling accuracy, but they claim to support the same real-time features. I've also found the QNX documentation much easier to follow, and I managed to turn out a BSP and a custom device driver within a week of first receiving the software.
Re:Realtime, VxWorks, Dolla Dolla Bill Yall (Score:4, Informative)
Re:A quick search reveals (Score:0, Informative)
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Re:Realtime, VxWorks, Dolla Dolla Bill Yall (Score:5, Informative)
Re:A quick search reveals (Score:2, Informative)
Aside, I find it amazing that a 4 letter TLD is allowed to be used this way as long as it has. Nimp isn't just a shock site, it's got to break enough criminal laws to put it's owners and people that link to it in jail.
Re:POS needs realtime? hahahahhaha (Score:5, Informative)
These things typically run on embedded devices, not a friggin' Dell midtower. They do one job and they do it with exacting accuracy, on minified motherboards and fanless CPUs, hooked up to custom-built controllers and monitoring equipment.
RTOS tasks are typically things we used to do in solid state with simple feedback logic, but the RTOS allows it to be done in software at a lower cost, plus allowing easy updates or adjustments without a complete redesign.
Re:Realtime, VxWorks, Dolla Dolla Bill Yall (Score:3, Informative)
Another problem I have seen in VxWorks is the priority inheritance: It doesn't work correctly for nested locks: A low priority task takes a lock A, runs it's own code for and then it calls into say a driver and takes lock B. Now some high-priority task wants to access the same driver and tries to lock B. The first tasks is then boosted in priority and soon finishes the driver call and unlocks B. But it is not unboosted before it release A. That is a huge problem in a RTOS: Suddenly the timing of the high priority task depends on how long a low priority tasks keeps the completely irrelevant lock A. You don't get the decoupling, that the timing of a high priority tasks only depends on the tasks of equal or higher priority, which is so important in a RTOS.
Basicly, I think core of Linux with PREEMPT_RT is a better (more deterministic) RTOS than VxWorks, but slower (longer maximum latencies for especially interrupts); but all subsystems around the scheduler etc. aren't coded for RT use - i.e. it has non-deterministic code-paths and might even make blocking calls. So an RT application on Linux/PREEMPT_RT can basicly only use basic highres timers, simple serial ports and memory mapped devices. Use of the netstack, disk IO is a no-go. But then again, the same applies to VxWorks...
Re:A quick search reveals (Score:3, Informative)
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Re:Realtime, VxWorks, Dolla Dolla Bill Yall (Score:2, Informative)
Re:Realtime, VxWorks, Dolla Dolla Bill Yall (Score:3, Informative)