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User I/O User I/O program program program program 4 4 1 1 I/O I/O command command WRITE WRITE 2a 2 Interrupt Interrupt 2b handler handler 5 5 WRITE WRITE END END 3a 3 3b WRITE WRITE (c) Interrupts; long I/O wait (b) Interrupts; short I/O wait
I/O program 4 I/O command 5 END Program Flow of Control without and with Interrupts
(a) No interrupts
User program 1 WRITE 2 WRITE 3 WRITE Figure 3.7
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