Task running Time

Does VxWorks support dynamic task priority assignments?

You could use a timer interrupt, which would have a higer priority than the tasks and then elevate the priority of the one that you want to run.

You could also probably work something out with a task sleep function.

owever, what you are trying to do, though, sounds like you are defeating part of the purpose of the RTOS and attempting to use a round-robin like scheduler instead. There are problems associated with this type of scheduling which is why one uses a pre-emptive priority based scheduler in the first place.

If you approach the code from a different perspective you can probably achieve better performance. Try to find ways to use the various priority levels available to you to your advantage as opposed to making everything equal and time slicing it.

When I was working on automotive RTOSes we found that a lot of OEMs had to include an RTOS (typically an OSEK) in their systems to get through the manufacturers' door with their products, but the mix of inertia, NIH syndrome, and unfamiliarity with RTOS concepts meant that they were still designing cyclic schedulers, complete with all manner of gruesome major/minor cycles in them.

pete