Pause instead of sleep?

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#Pause instead of sleep?

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addshore 07/30/2025 03:53 PM

Is there a way to sleep, but not allowed other tasks to run during that period?

bitphlipphar 07/30/2025 03:54 PM

For a specific container? Not the entire system?

addshore 07/30/2025 03:56 PM

So, we are doing some low level stepper motor stuff (and debugging things).
We are manually controlling steps with GPIo pins currently, pulsing one of them to control the steps. And I want consistent pauses between them, but I'm guessing my use of sleep is causing other containers to do stuff as I'm currently running jaguar?

bitphlipphar 07/30/2025 03:56 PM

How long do you need to pause?

addshore 07/30/2025 03:57 PM

We would be happy with a second for now

bitphlipphar 07/30/2025 03:58 PM

So you could do something like this: Change the priority of your running process to be higher than other things and do a busy-wait loop until enough time has passed ideally using Time.monotonic-us --since-wakeup.(edited)

bitphlipphar 07/30/2025 04:00 PM

You can change the priority of your process using something like Process.current.priority = Process.PRIORITY-HIGH.

bitphlipphar 07/30/2025 04:01 PM

You'll be fairly unresponsive while you loop.

addshore 07/30/2025 04:02 PM

Just realized that just running the thing with Jag disable makes a hell of a difference already!

bitphlipphar 07/30/2025 04:03 PM

So maybe just running your container with a higher priority would help?

bitphlipphar 07/30/2025 04:03 PM

When your sleep times out, you'll be more important than Jaguar, so it probably would improve things considerably.

bitphlipphar 07/30/2025 04:22 PM

fancy-sleep duration/Duration -> none:
  deadline-us := (Time.monotonic-us --since-wakeup) + duration.in-us
  while true:
    remaining-us := deadline-us - (Time.monotonic-us --since-wakeup)
    if remaining-us <= 0: return
    // Don't sleep when too close to the deadline.
    sleep-us := remaining-us - 100_000 
    // Don't sleep for too little time.
    if sleep-us >= 20_000: sleep --ms=(sleep-us / 1_000)

12 messages in total