CSC Operating Systems
In Process Control Block (PCB), information associated with each process are contained, including what four things?
Memory Management scheduling, program counter, local variables, CPU scheduling information
Cooperating processes need Inter-process Communication (IPC). Two basic IPC models are what?
Message passing and shaped memory model
Mac OS X Kernel, partly based on Mach that is an example of ____, structures the operating system by removing nonessential components form the kernel and implementing them as user-level programs, leading to a smaller and reliable kernel
Microkernel
What is System calls?
Requests for operating system service
From the perspective of synchronization, blocking send/receive is considered ____ while non-blocking send/receive is consider _____
Synchronous, asynchronous
What is Module?
That can be mounted to OS kernel
What is booting?
The process of loading the operating system kernel
T/F An interrupt vector is an address that indexed to an interrupt handler
True
T/F In Unix, system call fork() creates the new process
True
T/F In all modern computers, before fetching a new instruction, the CPU Will check if there are any interrupts to be handled
True
T/F RPC provides a stub on the client side, a separate one from each remote procedure
True
T/F The client[server architecture is not the preferred model for implementing operating systems these days
True
T/F The remote method of invocation (RMI) allows a thread/process to invoke a method on a remote object
True
T/F Wait() returns the process identifier of a terminated child
True
T/F a short-term scheduler selects which process has to be executed next and allocates CPU
True
The objective of multi-programming is to a) have some process running at all times b) have multiple programs waiting in a queue ready to run c) to minimize CPU utilization d) none of the mentioned
a) have some process running at all times
What is a long term scheduler? a) it selects which process has to be brought into the ready queue b) It selects which process has to be executed next and allocates CPU c) It selects which process to remove from memory by swapping d) none of the mentioned
a) it selects which process has to be brought into the ready queue
The main function of the command interpreter is a) to get and execute the next user-specified command b) to provide the interface between the API and application program c) to handle the files in operating system d) none of the mentioned
a) to get and execute the next user-specified command
What is the ready state of a process? a) when process is scheduled to run after some execution b) when process is unable to run until some task has been completed c) when process is using the CPU d) none of the mentioned
a) when process is scheduled to run after some execution
The process Control Block is: a) process type variable b) Data structure c) A secondary storage section d) a Block in memory
b) Data structure
How does the software trigger an interrupt? a) sending signals to CPU through bus b) executing a special operation called system call c) executing a special program called system program d) executing a special program called interrupt trigger program
b) executing a special operation called system call
A virtual machine system a) offers no protection to the various system resources b) is ideal for operating system research and development c) needs no physical resources d) does not support multitasking
b) is ideal for operating system research and development
What is a trap/exception? a) hardware generated interrupt caused by an error b) software generated interrupt caused by an error c) user generated interrupt caused by an error d) none of the mentioned
b) software generated interrupt caused by an error
An important goal of an operating system is to a) translate programs written in higher programming language to machine language b) bind the user code with library routines and make an executable code c) allocate and manage resources in the computer system d) slow down execution of programs so users are forced to buy systems with more RAM
c) allocate and manage resources in the computer system
A pipe in UNIX Shell command allows a) taking standard input from a file b) sending standard output to a file c) connecting the standard output of a process to the standard input of another process d) leaking out information to hackers
c) connecting the standard output of a process to the standard input of another process
If all processes I/O Bound, the ready queue will almost always be ____ And the short term scheduler will have a ___ to do. a) full, little b) full, lot c) empty, little d) empty, lot
c) empty, little
What is a medium-term scheduler? a) it selects which process has to be brought into the ready queue b) it selects which process has to be executed next and allocates CPU c) it selects which process is remove from memory by swapping d) none of the mentioned
c) it selects which process is remove from memory by swapping
With ____ only one process can execute at a time, meanwhile all other process are waiting for the processor. With ____ more than one process can be running simultaneously each on a different processor. a) multiprocessing, multiprogramming b) multiprogramming, uniprocessing c) multiporgramming, multiprocessing d) uniprogramming, multiprocessing
c) multiporgramming, multiprocessing
In UNIX, the return value for the fork system is ___ for the child process and ____ for the parent process a) a negative integer, zero b) zero, a negative integer, c) zero, a nonzero integer d) a nonzero integer, zero
c) zero, a nonzero integer
Consider a personal computer in which keyboard interrupts arrive at the rate 10 interrupts/sec. If interrupt processing takes 20 * 10^-6 seconds, what percentage of the CPU time is spent on interrupt processing? a) 10% b) 2.0% c) 0.10% d) 0.02%
d) 0.02%
UNIX is an example of a a) a single user, single tasking operating system b) a single-user, a multitasking operating system c) a multi-user, single tasking operating system d) a multi-user, multitasking operating system
d) a multi-user, multitasking operating system
Cloud computing includes: a) private cloud b) public cloud c) Hybrid cloud d) all of the mentioned
d) all of the mentioned
Messages sent by a process a) have to be a fixed size b) have to be a variable size c) can be fixed or variable sized d) none of the mentioned
c) can be fixed or variable sized
Which item below is not about Cloud computing: a) IaaS b) PaaS c) SaaS d) AaaS
d) AaaS
T/F A process that is based on IPC mechanism which executes on a different systems and can communicate with other processes using message based communication, is called Remote Procedure Call
True
T/F In operating system, each process has its own address space and global variables
True
What is HALT?
A privileged instruction, if dual mode operation is supported
What is interrupt vector?
A table of starting addresses of interrupt service routines
In Producer-Consumer Model, the size of ____ is considered significant to the throughput of the whole system.
Buffer
What is PCB?
Data structure to maintain information about a process.
What is Deadlock?
Each process needs a resource held by another process and hence all of them wait indefinitely, unable to make any progress
T/F A process stack does not contain function parameters
False
T/F Change to user mode from system mode is an example of non-privileged instructions
False
T/F The OSX has monolithic kernel
False
T/F To differentiate the many network services, RPC supports the HTTP are used
False
T/F To resolve the problem of data representation on a different system RPC's define machine depending representation of data
False
T/F Windows 10 does not support multitasking since it is meant to be used on a personal computer
False
In indirect communication, messages are directed and received from what?
Mailbox
T/F cascading termination refers to termination of all child processes before the parent terminates normally
True
To access the services of operating system, the interface is provided by the a) systems calls b) API c) Library d) assembly instructions
a) systems calls
What are three kinds of hardware support the can allow for efficient implementation of operating system functions?
CPU, DMA, Interrupt Register
T/F I/O polling refers to that CPU watches the I/O control bit randomly to avoid a loop and save CPU resources
False
T/F Kernel is made of various modules which cannot be loaded in running operating systems
False
T/F The main function of the command interpreter is to provide the interface between the API and application program
False