OS I/O Systems

message – passing

draft – passing

secondary memory

cache

nonmaskable interrupt

blocked interrupt

maskable interrupt

none of the mentioned

major factor

minor factor

does not matter

none of the mentioned

returns immediately, without waiting for the I/O to complete

does not return immediately and waits for the I/O to complete

consumes a lot of time

is too slow

polling

interrupt

driver

controlling

controller

driver

host

bus

holds a copy of the data

is fast memory

holds the only copy of the data

holds output for a device

Devices

Buses

Device drivers

I/O systems

the interrupts

the memory addresses of specialized interrupt handlers

the identifiers of interrupts

the device addresses

bytes one by one

block of bytes as a unit

with unpredictable response times

none of the mentioned