在底层中断，从几个外设来的外设中断请求 （PIRQ）在中断控制器处相或产生一个到CPU的中断清求（INTn），这就是内核级 的中断清求。
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These programs, such as LevelUp, Pirq, and Belly, allow business owners to tailor loyalty programs to their specific business needs.
FORBES: Will 2013 Be The Year of Loyalty Programs?
After an initial private launch to only Apple employees, Pirq will be rolling out its app to the rest of the public in the Bay Area within the next 12 months.
FORBES: Apple Employees Get A New "Pirq"
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