Post a signal within an interrupt handler

[Zhihui Zhang]

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



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