Messages in this thread | | | Date | Thu, 16 May 2002 11:55:00 -0400 | From | Ion Badulescu <> | Subject | Re: Q: x86 interrupt arrival after cli |
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On Wed, 15 May 2002 20:27:20 -0400, Bart Trojanowski <bart@jukie.net> wrote: > [-- text/plain, encoding quoted-printable, 14 lines --] > > Quick question for the x86 gurus: > > If a hardware interrupt arrives within a spin_lock_irqsave & > spin_unlock_irqrestore will the interrupt handler associated with said > interrupt be called immediately after the spinlock is released? > > I am interested in any delays, even those less then a jiffie.
The interrupt will occur when the instruction after the "sti" finishes. That's a one assembler instruction delay, i.e. a few clock cycles.
*Which* interrupt will be serviced first, however, depends on how many interrupt sources you have active and on the IRQ prioritization.
Ion
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