On Sat, 24 Mar 2007, matze wrote:
> El Sat, Mar 24, 2007 at 07:13:32AM -0400 Robert P. J. Day ha dit:
>
> >
> > regarding the properties of the "mutex" locking mechanism, the file
> > Documentation/mutex-design.txt claims:
> >
> > ...
> > Disadvantages
> > -------------
> >
> > The stricter mutex API means you cannot use mutexes the same way you
> > can use semaphores: e.g. they cannot be used from an interrupt
> > context, ...
> >
> > but i thought semaphores *also* can't be used from interrupt
> > context. or am i somehow misreading this? thanks.
>
> semaphores can be given/released ('up'-operation), but not be
> taken/acquired ('down') in interrupt context
ah, so i was misreading it -- i thought that passage meant that you
couldn't use semaphores *at all*. thanks.
rday
--
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA
http://fsdev.net/wiki/index.php?title=Main_Page
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