Messages in this thread | | | Date | Mon, 13 Sep 1999 10:43:54 -0400 (EDT) | From | Benjamin LaHaise <> | Subject | Re: spin_lock and linux philosophy question... |
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On Mon, 13 Sep 1999, Robert Dinse wrote:
> On Mon, 13 Sep 1999, Momchil Velikov wrote: > > > > You can also use a spinlock in an interrupt handler, where you can't sleep at > > all. > > > > Regards, > > -velco > > Are there ever cases where you lock outside of interrupts but expect code > inside of an interrupt handler to unlock? Or conversely, cases where you lock > during an interrupt, do some preliminary work, then return expecting code > outside to unlock?
Not with spinlocks. Which is to say that:
a) a process may never block while holding a spinlock b) an interrupt context may never end while still holding a spinlock
I'm not too sure what the debugging spinlock code does wrt these invariants, but checking a local lock depth wouldn't be too difficult.
-ben
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