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一．选择题（
20
分，每题
1
分）
1.
Generally
speaking,
which
one
is
not
the
major
concern
for
a
operating
system in the following four options?(
D
)
the computer
the system resources
and
apply
the
interface
between
user's
program
and
computer
hardware system
-level programming language complier
2.
The main disadvantage of batch system is (
C
)
utilization is low
not concurrent
of interaction
degree of automation
3.
A
process
transforms
from
waiting
state
to
ready
state
is
caused
by
the
(
B
)
upt event
s scheduling
a process for a program
g for some events
4.
The concurrent process is refers to (
C
)
process can be run in parallel
process can be run in order
process can be run in the same time
process can not be interrupted
5.
In multi-process system, in order to ensure the integrity of public variables,
the
processes
should
be
mutually
exclusive
access
to
critical
areas.
The
so-called critical area is (
D
)
A.A buffer
B.A date area
onization mechanism
D.A program
6.
The
orderly
use
of
resources
allocation
strategy
can
destroy
the
condition
(
D
) to avoid deadlock.
exclusive
and wait
preemption
ar wait
7.
User's applications use the system resources to complete its operation by the
support and services of (
C
)
ng the mouse
rd command
call
cal user interface
8.
There are four jobs arrived at the same time and the execution time of each
job
is
2h.
Now
they
run
on
one
processor
at
single
channel,then
the
average
turnaround time is ( B
)
A.1h
B.5h
C.2.5h
D.8h
9.
Among the job scheduling algorithms, ( B ) is related to the job's estimated
running time.
scheduling algorithm
-job-first scheduling algorithm
response ratio algorithm
ed scheduling
memory management, the purpose of using the overlay and swapping is
(
C
)
g main memory
ing main memory physically
main memory space
ing CPU utilization
the page-replacement algorithm,which one can cause the Belady
phenomenon? (
A
)
NG
12.
The following description of the system in safe state,which one is
correct?(
B
)
must cause deadlock if the system is in insecure state
may cause deadlock if the system is in insecure state
may cause deadlock if the system is in secure state
are wrong
lly, when we talk about
(
C
)
t hardware memory from damaging
t program from losing in memory
t the cross-border call between programs
t the program from being peeped
actual capacity of virtual memory is equal to (
B
)
capacity of external memory(disk)
sum of the capacity of external memory and main memory
space that the CPU logical address gives
smaller one between the option B and C
al file's organization is determined by (
D
)
ations
memory capacity
al memory capacity
ing system
16.A computer system is configured with two plotters and three printers,in
order to properly drive these devices,system should provide (
C
) device
driver program.
A.5
B.3
C.2
D.1
there are fewer number of channels in system ,it may cause
effective way?(
A
)
ing the speed of CPU
the virtual device technology
some hardware buffer on the devices
sing the path between devices and channels
I/O devices and main memory are exchanging data, it can be achieved
without CPU's frequently intervention,this way of exchanging data is called
(
C
)
g
upts
memory access
of them
19.
The following description of device management, which one is not
correct?(
B
)
external devices are managed by the system in uniform
l is a software of controlling input and output
I/O interrupt events from the I/O channel are managed by device
management
of the responsibility of the operating system is to use the hardware
effectively
operating system used (
A
), it realized a mechanism that we can
use more space to save more time.
NG
l storage
l
y
二．填空题（
20
分，每空
1
分）
re
may
trigger
an
interrupt
by
executing
a
special
operation
called
a
system call .(P7)
there is only one general-purpose CPU,then the system is a single-processor
system.(p12)
3.
A process can be thought of as a program in execution. (p79)
a
process
executes,it
changes
process
may
be
in
one
of
the
following states:new,running,waiting,ready or terminated .(p83)
-term(job) scheduling is the selection of processes that will beallowed to
contend for the Short-term(CPU) scheduling is
the selection of one
process from the ready queue.
(p116)
process
executing
in
the
operating
system
may
be
either
independent
processes
or
cooperating
processes.
Cooperating
processes
require
an
interprocess
communication
mechanism
to
communicate
with
each
pally,communication
is
achieved
through
two
schemes:
share
memory and message passing.
(p116)
modern
operating
systems,
resource
allocation
unit
is
process,
processor
scheduling unit is thread .(p127)
modern
operating
systems
provide
kernel
support
for
threads;among
these are Windows,as well as Solaris and Linux .(p146)
scheduling is the basis of multiprogrammed operating systems.(p153)
FCFS algorithm is nonpreemptive;the RR algorithm is preemptive.
mes,a waiting process is never again able to change state,because the
resources it has requested are held by other waiting situation is
called deadlock .
(p245)
main
purpose
of
a
computer
system
is
to
execute
programs,together with
the data they
access,must be in
main memory(at
least
partially) during execution.(P274)
13.
The
various
memory-management
algorithms
differ
in
may
comparing
different
memory-management
strategies,we
use
the
follow
considerations:Hardware support,Performance,Fragmentation,Relocation,
Swapping,Sharing and protection . (p310)
14.A process is thrashing if it is spending more time paging than executing.
l memory is a technique that enables us to map a large logical address
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