Term
| From the user's point of view, which of the following is the OS mostly designed? |
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Definition
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Term
| In the single processor system there is only one general purpose, what are the other processors used for? |
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Definition
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Term
| Which of the following are types of multi-processor system? |
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Definition
Asymmetric multiprocessing <br>
Symmetric multiprocessing |
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Term
| Which of the following operating system services is helpful for ensuring efficient operation of the system? |
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Definition
Resource allocation
Accounting
Protection and security
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Term
| Which of the following activities is the OS responsible for in connection to memory management? |
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Definition
| Keeping track of which parts of memory are currently being used and by whom
Deciding which processes (or parts thereof) and data to move into and out of memory
Allocating and de-allocating memory space as needed |
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Term
| What can we use to prevent a user program from returning control to the OS? |
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Definition
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Term
| Why does the CPU switch between multiple jobs in a Time Sharing OS? |
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Definition
| the CPU switches frequently between multiple jobs so that users can interact with each program while it is running |
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Term
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Definition
| A program loaded into memory and executing |
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Term
| What does Virtual memory allow? |
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Definition
| a job to run while not completely in memory and to run programs that are larger than physical memory. |
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Term
| Which two operating modes are, at the very least, required to ensure proper executing of the OS? |
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Definition
user mode
kernel mode
(supervisor, system, privileged)
mode bit indicates which mode it is in.
kernel(0) user (1) |
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Term
| Which of these is one of the major categories of system calls? |
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Definition
Process Control
File Manipulation
Device Manipulation
Information Maintenance
Communications
Protection |
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Term
| Which of these is file management related? |
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Definition
create/delete file
open, close
read, write, reposition
get/set file attributes |
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Term
| Which of these is information maintenance related? |
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Definition
get/set time or date
get/set system data
get/set process, file, or device attributes |
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Term
| Which of these states is valid for a process? |
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Definition
Waiting
Running
Ready
New
Terminated |
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Term
| What processes are in the ready queue? |
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Definition
| the processes that are residing in main memory and are waiting too execute |
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Term
| Which of the following will NOT change the state of a process? |
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Definition
Creates a subprocess
forcibly removed from the system
sends an I/O request |
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Term
| What is the job of the long term scheduler? |
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Definition
| Choose which program to load into memory |
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Term
| Which is a CPU bound process? |
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Definition
| Generates I/O requests infrequently, using more of its time doing computations |
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Term
| What is a "context switch"? |
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Definition
| Saving the state of the current process and restoring a different process |
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Term
| Which of the following is a typical reason to terminate a child process? |
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Definition
| The child has exceeded its usage of the resources it has been allocated
The task assigned to the child is no logner required
The parent is exiting |
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Term
| Cooperating processes require ________________ mechanism to allow an exchange of adata information |
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Definition
| interprocess communication |
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Term
| Which of the following is a logical method for implementing send()/receive() operations? |
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Definition
Direct or indirect communication
Synchronous or asynchronous
communication
Automatic or explicit buffering |
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Term
| When using direct communication, the communication link has all the following properties expect one. Which is incorrect? |
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Definition
| A link may be associated with more than two processes |
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Term
| For indirect communication, what are the messages sent to or receieved from? |
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Definition
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Term
| What is the definition of blocking send? |
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Definition
| The sending process is blocked until the message is received by the receiving process or by the mailbox |
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Term
| There are three way to implement the temportay queues for indirect or direct communication. Which of these is incorrect |
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Definition
Zero capacity<br>
Bounded capacity<br>
Unbounded capacity |
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Term
| What is an address generated by the CPU commonly referred to as? |
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Definition
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Term
| What is a logical address usually referred to as? |
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Definition
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Term
| What is the run-time mapping from virtual to physical address done by? |
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Definition
| A hardware device called the memory-management unit (MMU) |
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Term
| What are the two levels that thread support can be provided at? |
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Definition
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Term
| Which of the following is one of the issues to consider with multi-threaded programming |
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Definition
Cancellation
The fork() and exec() system calls
Scheduler activations
Signal handling
Thread pools
Thread-specific data |
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Term
| When does the short-term scheduler select the next process from the ready queue? |
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Definition
| when the CPU becomes idle |
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Term
| When the OS supports kernel level threads the scheduling is based on what? |
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Definition
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Term
| The following Criteria are used for CPU scheduling |
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Definition
CPU utilization
Throughput
Turnaround Time
Waiting Time
Response Time |
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Term
| When scheduling kernel level threads the ____ scope scheme is used to determine which thread runs. |
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Definition
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Term
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Definition
| When two or more processes/threads are waiting forever for an event that can be caused by only one of the waiting processes/threads |
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Term
| The following are classic problems of synchronization. |
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Definition
Bounded-Buffer
Dining-Philosophers
Readers-Writers Problem |
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Term
| When does mutual exclusion need to be applied? |
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Definition
| Use of non-shareable resources |
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Term
| What does no preemption mean? |
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Definition
| If a process holds a resource and is preempted, all resources held stay held, until the process runs again |
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Term
| Which Deadlock avoidance algorithms can be used to dynamically examine the resource allocations to ensure a circular wait condition does not exist? |
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Definition
safe state
resource allocation graph |
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Term
| If there are several instances of a resource type in the system and you are checking for a deadlock, what structures do you need? |
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Definition
Available - vector
Allocated - matrix
Requests - matrix |
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Term
| What option is a way to recover from a deadlock? |
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Definition
Process termination
Resource preemption
Abort all deadlock processes/threads |
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