Messages in this thread | | | Date | Tue, 16 Jun 2015 17:43:04 +0200 | From | Mason <> | Subject | Re: [Semaphore API] down_interruptible_timeout |
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On 15/06/2015 18:56, Thomas Gleixner wrote:
> 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 for the pointer. I will also read the following LKML thread. http://thread.gmane.org/gmane.linux.kernel/664514
Regards.
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