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
m.
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