Re: Interrupt Handling in linux

[Sylvain Munaut]

Harish K Harshan wrote:

> Hi.
>
> Can Interrupt handlers in linux, be interrupted by other running
> processes??? to make it more clear, im developing a driver for and
> ADC card, and would like to know if the CPU can or rather WILL
> schedule wnother running process in the middle of the ISR, when a
> timer interrupt comes in. If thats the case, then we need to use
> spinlocks or other mechanisms in our ISR, right?? im new to this,
> so if theres something not clear, it just just that my
> understanding of this topic is not very deep.

If you share something between an ISR and a 'not' ISR, then you should
ensure proper locking.
Look at the "kernel-locking" DocBook in linux/Documentation/DocBook


Sylvain Munaut

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