> While reading the code vfs_aio.c, I find out some comments saying it is
> not safe to post a signal from the interrupt handler aio_physwakeup(). So
> it calls timeout(9) within that handler and let the timeout routine to
> post the signal. I do not understand this. Isn't the timeout mechanism
> also driven by an interrupt (clock)?
>
> Any enlightment is appreciated.
>
> -Zhihui
>
AFAIK it is safe to post a signal in an interrupt context. Maybe it has
more to do with reducing interrupt latency than safety.
-lq
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