nterrupt- drive lO Cycle(中断驱动的Wo循环 1o controller device driver initiates CPU executing hecks for interrupts between instructions input ready, output omplete, or error CPU receiving interrupt. sina transfers control to nterrupt handler interrupt handler processes data. returns from interrupt CPU resumes processing of interrupted task Applied Operating System Concepts 12.5 Silberschatz, Galvin, and Gagne @199912.5 Silberschatz, Galvin, and Gagne ©1999 Applied Operating System Concepts Interrupt-drive I/O Cycle（中断驱动的I/O循环）