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A kernel is described as having a 'zero latency interrupt' capability. This means

  • A.some interrupts are never disabled by the kernel at all
  • B.the kernel's own operations complete in no time
  • C.context switches take no processor cycles
  • D.the tick handler runs before any other interrupt

Answer: A

Priorities above a configured threshold are left permanently enabled, so their latency is the hardware's alone. The price is that such handlers may not call the kernel, since the kernel's own structures are not protected against them.

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