Quiz 10 Functions of an Operating System
All of the following a differences between Windows and Linux/Unix servers, except
Linux/Unix generally costs more than Windows servers
An operating system that supports multitasking allows multiple programs to execute concurrently.
True
The operating system kernel is responsible for allocating hardware resources to application programs.
True
The scheduler determines which thread to move to the running state.
True
A significant problem with contiguous memory allocation using fixed size memory partitions is ____.
wasted memory
Which of the following is not an operating system function?
Database management
A process queue may be used for interprocess communication when no data needs to be passed.
False
A real time process always contains subunits that can be executed concurrently or simultaneously.
False
A service call is a processing request made by an application program to the operating system kernel.
False
A thread is the unit of memory read or written to the swap space.
False
An operating system that supports multitasking allows a single program to be divided into components that can execute concurrently
False
Device drivers are located within the operating system service layer
False
Dispatching a thread moves it from the running state to the ready state.
False
Explicit priority scheduling chooses the next process to be dispatched based on the expected amount of CPU time needed to complete the process
False
First-come first-serve scheduling guarantees that a process will receive sufficient resources to complete one program cycle within a stated time interval
False
Information about a single process' execution state (e.g., register values, status, etc.) is held in a page table for use by the scheduler.
False
Memory pages not held in primary storage are held in the page table of a secondary storage device.
False
The command layer, service layer, and interrupt control layer are the primary layers of an operating system.
False
The hardware resources consumed by the resource allocation functions of the kernel are sometimes referred to as supervisor overhead.
False
The service layer directly interacts with storage and I/O devices.
False
The supervisor determines which thread to move to the running state.
False
The term real time scheduling describes to any type of scheduling in which a running thread may lose control of the CPU to another thread.
False
Under contiguous memory allocation, portions of a single process may be physically located in scattered segments of main memory.
False
Under virtual memory management, a page hit occurs when a program attempts to access a page not held in physical memory.
False
Which of the following is not an example of a command language?
Java
The process of converting an address operand into a physical address within a memory partition or page frame is called address resolution.
True
The term preemptive scheduling describes any type of scheduling in which a running thread may lose control of the CPU to another thread
True
To achieve efficient use of memory and a large number of concurrently executing processes, most operating systems utilize virtual memory management
True
Under contiguous memory allocation, all portions of a process must be loaded into sequential physical memory locations.
True
Under the shortest time remaining (STR) scheduling method, processes requiring the least CPU time are dispatched first.
True
Under the shortest time remaining scheduling method, processes requiring the least CPU time are dispatched first.
True
Under virtual memory management, the location of a memory page is determined by searching a page table
True
Under virtual memory management, the location of a memory page is determined by searching a page table.
True
When a thread makes an I/O service request, it is placed in the blocked state until processing of the request is completed
True
When a thread makes an I/O service request, it is placed in the blocked state until processing of the request is completed.
True
What operating system component does application software call to perform functions such as file manipulation and printer control?
service layer
The command layer of the operating system is sometimes called the ____.
shell
Most service calls are actually indirect requests for ____.
system resources
A(n) ____ can execute instructions to process a single transaction, retrieve and store data from an I/O device, or retrieve and analyze one set of process variables.
thread cycle
A request to execute a service layer function is called a(n) ____.
service call
A thread in the running state requires only access to the CPU to continue execution
False
The operating system keeps track of thread-specific information in a thread control block.
True
A primary resource allocation goal in most operating systems is efficient use of hardware and other resources
True
A process is a unit of executing software that is managed independently by the operating system.
True
A process is moved to the blocked state because it directly or indirectly requests a resource that cannot be immediately provided.
True
A process or program that divides itself into multiple threads is said to be multithreaded.
True
A virtual resource is apparent to a process or user, although it may not physically exist.
True
A(n) thread is an executable subunit of a process that is scheduled independently but shares memory and I/O resources with its parent.
True
Application programmers reuse services already present in the service layer so they don't have to rewrite them each time they build an new application.
True
Application software makes calls to the operating system service layer to perform functions such as file manipulation and printer control.
True
In the first come first served (FCFS) scheduling method, thread are dispatched in order of their arrival.
True
In the first come first served (FCFS) scheduling method, threads are dispatched in order of their arrival.
True
Most service calls are indirect requests for resources, while the kernel directly interacts with the hardware
True
No more than one process or thread can execute simultaneously on a single CPU but multiple processes or threads can execute concurrently by taking interleaved turns.
True
On a single processor computer, multitasking is achieved through concurrent execution of processes.
True
Process control blocks are normally organized into a linked or circular list called the process queue or run queue.
True
Real-time scheduling guarantees that a process will receive sufficient resources to complete one program cycle within a stated time interval.
True
The CPU periodically generates a timer interrupt to guarantee the scheduler an opportunity to allocate the CPU to another ready thread.
True
The act of giving control of a CPU to a ready thread is called dispatching.
True
The command layer is the user interface to an operating system.
True
Periodic ____ is required to combine unallocated partitions when contiguous memory allocation is used.
compaction
CPU control is lost whenever a(n) ____ is received and the CPU pushes the current thread onto the stack and transfers control to the operating system.
interrupt
_____ refers to the process that prevents memory allocated to one program from unauthorized use of another program
memory protection
A group of processes descended from a common ancestor, including the common ancestor itself, is called a(n) ____.
process family
Process control blocks are normally organized into a linked list called the ____.
process queue
Dispatching a thread moves it from the ____ state to the ____ state.
ready, running
