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to access it. setdelayed() actually ORs the bits in `idelayed' into `ipending' and clears `idelayed'. Call setdelayed() every (normal) clock tick to convert delayed interrupts into pending ones. Drivers can set bits in `idelayed' at any time to schedule an interrupt at the next clock tick. This is more efficient than calling timeout(). Currently only software interrupts can be scheduled. |
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