About interrupt handler

[Zhengwang Ruan]

-------- Original Message --------
From: cheneydeng
Sent: 2012年02月22日 星期三 23时38分37秒
To: kernelnewbies
Subject: About interrupt handler
> hi all,
> I'm begin to learn the Kernel and i'm reading <<Linux kernel
> development>>.It says "This is an important point, always keep in mind
> that all interrupt handler has interrupted other code(possibly even
> another interrupt handler on a different line)".What i am not able to
> understand is how a interrupt handler be interrupted ? DID NOT it
> uninterrupted?

It has more related to CPU architecture. Generally, while an interrupt
handler is being executed, the handler itself can chose to disable or
enable external interrupts (i.e, take x86 for example, IF bit for cflags
reg controls this.). If IF is enabled, then the interrupt handler
currently being executed may be interrupted and then jump to the entry
for the coming interrupt.

Thanks,
-Zhengwang


>
> ------------------
> best regards！
> cheneydeng
>
>
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