Messages in this thread | | | Date | Mon, 15 Jun 2015 18:56:29 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [Semaphore API] down_interruptible_timeout |
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On Mon, 15 Jun 2015, Mason wrote: > A) process-context kernel thread fills a FIFO and calls down(&fifo_empty); > B) ISR handles the FIFO-empty interrupt with up(&fifo_empty); > > However, in case something goes wrong and the interrupt never fires, > I don't want the process to be stuck in an uninterruptible sleep. > > Perhaps I can set a tiny timeout (e.g. 10 µs) and not worry about > the interruptible part for such a small duration? (Hmm, __down_common > calls schedule_timeout, which is jiffies-based. I don't think there > is a hrtimers flavor. So µs timeouts would be off the table?) > > Or I could use the interruptible version, and let the user kill the > operation if necessary.
Use a completion.
Thanks,
tglx | |