Re: raw memory & PCI bus access
Alan Cox (alan@lxorguk.ukuu.org.uk)
Thu, 21 Oct 1999 15:13:18 +0100 (BST)
> Say I have a driver that realizes a "virtual irq" (/dev/irq).
> User application waits for interrupts by calling select() for
> that device. Obviously such a driver doesn't need much of code.
> What a maximum latency between irq occurance and
> userapp reaction I should expect?
Infinite if your IRQ is shared.
You probably want to handle the IRQ in the kernel including retrieving the
status you need and clearing the irq state.
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