On Wed, 25 May 2005, Tom Vier wrote:
> If irqs are run in threads, which are scheduled, how are they scheduled?
> fifo? What's the point then; simply to let the top half run to completion
> before another top half starts? If it's about setting scheduling priorities
> for irq threads, some one top half can prempt another, why not just use irq
> levels, like bsd (using pic's is slower than using threads?)?
>
Long interrupt handlers can be interrupt by _tasks_, not only other
interrupts! An audio application running in userspace can be scheduled
over an ethernet interrupt handler copying data from the
controller into RAM (without DMA).
Esben
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