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Re: Interrupt handlers and mutex

On Tue, Jan 05, 2010 at 04:04:23PM +0000, Mindaugas Rasiukevicius wrote:
> David Holland <> wrote:
> > 
> > NetBSD also has "soft interrupts" that have more process context than
> > ordinary interrupt handlers; instead of borrowing the context of
> > whatever's running when the interrupt arrives, they run on dedicated
> > kernel threads; this means they can sleep to acquire mutexes. <...>
> On architectures which support "fast" software interrupts (e.g. x86, ARM),
> it actually borrows the context of currently running thread.

Is there some documentation on how "fast" software interrupts works ?
what happens to the borrowed thread when the soft interrupt handler
wants to sleep ?

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference

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