826149
Descripción
Test por Amanda Hatch, actualizado hace más de 1 año
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Creado por Amanda Hatch
hace alrededor de 10 años
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Pregunta 1
Pregunta
The ____ of a process contains temporary data such as function parameters, return addresses, and local variables.
Respuesta
-
program counter
-
data section
-
text section
-
stack
Pregunta 2
Pregunta
Which of the following is true in a Mach operating system?
Respuesta
-
All messages have the same priority.
-
Multiple messages from the same sender are guaranteed an absolute ordering.
-
The sending thread must return immediately if a mailbox is full.
-
It is not designed for distributed systems.
Pregunta 3
Pregunta
When communicating with sockets, a client process initiates a request for a connection and is assigned a port by the host computer. Which of the following would be a valid port assignment for the host computer?
Respuesta
-
21
-
1625
-
23
-
80
Pregunta 4
Pregunta
The ____________ class must be extended when implementing a remote object.
Respuesta
-
java.rmi.Remote
-
Naming.lookup
-
None. java allows any class to be a remote object
-
java.rmi.server.UnicastRemoteObject
Pregunta 5
Pregunta
Which of the following statements is true?
Respuesta
-
Message passing is typically faster than shared memory.
-
Message passing is most useful for exchanging large amounts of data.
-
Shared memory is far more common in operating systems than message passing.
-
Shared memory is typically faster than message passing
Pregunta 6
Pregunta
Imagine that a host with IP address 150.55.66.77 wishes to download a file from the web server at IP address 202.28.15.123. Select a valid socket pair for a connection between this pair of hosts.
Respuesta
-
150.55.66.77:80 and 202.28.15.123:3500
-
150.55.66.77:80 and 202.28.15.123:80
-
150.55.66.77:2000 and 202.28.15.123:80
-
150.55.66.77:150 and 202.28.15.123:80
Pregunta 7
Pregunta
A process control block ____.
Respuesta
-
includes information on the process's state
-
determines which process is to be executed next
-
is an example of a process queue
-
stores the address of the next instruction to be processed by a different process
Pregunta 8
Pregunta
The difference between a program and a process is that a program is an active entity while a process is a passive entity.
Respuesta
- True
- False
Pregunta 9
Pregunta
The exec() system call creates a new process.
Respuesta
- True
- False
Pregunta 10
Pregunta
The list of processes waiting for a particular I/O device is called a(n) ____.
Respuesta
-
device queue
-
ready queue
-
standby queue
-
interrupt queue
Pregunta 11
Pregunta
All access to POSIX shared memory requires a system call.
Respuesta
- True
- False
Pregunta 12
Pregunta
Local Procedure Calls in Windows XP are similar to Remote Procedure Calls.
Respuesta
- True
- False
Pregunta 13
Pregunta
Java's RMI is a feature similar to RPCs
Respuesta
- True
- False
Pregunta 14
Pregunta
For a single-processor system, there will never be more than one process in the Running state.
Respuesta
- True
- False
Pregunta 15
Pregunta
Shared memory is a more appropriate IPC mechanism than message passing for distributed systems.
Respuesta
- True
- False
Pregunta 16
Pregunta
A socket is identified by an IP address concatenated with a port number.
Respuesta
- True
- False
Pregunta 17
Pregunta
Sockets are considered a high-level communications scheme.
Respuesta
- True
- False
Pregunta 18
Pregunta
The Mach operating system treats system calls with message passing.
Respuesta
- True
- False
Pregunta 19
Pregunta
The _____________ refers to the number of processes in memory.
Respuesta
-
long-term scheduler
-
process count
-
degree of multiprogramming
-
CPU scheduler
Pregunta 20
Pregunta
When using RMI, remote objects are referenced via a proxy.
Respuesta
- True
- False
Pregunta 21
Pregunta
When a child process is created, which of the following is a possibility in terms of the execution or address space of the child process?
Respuesta
-
The child is a duplicate of the parent.
-
All of the above
-
The child process runs concurrently with the parent.
-
The child process has a new program loaded into it.
Pregunta 22
Pregunta
A _________________ saves the state of the currently running process and restores the state of the next process to run.
Respuesta
-
state switch
-
save-and-restore
-
none of the above
-
context switch
Pregunta 23
Pregunta
A process may transition to the Ready state by which of the following actions?
Respuesta
-
Newly-admitted process
-
Awaiting its turn on the CPU
-
Completion of an I/O event
-
All of the above
Pregunta 24
Pregunta
In a(n) ____ temporary queue, the sender must always block until the recipient receives the message.
Respuesta
-
unbounded capacity
-
variable capacity
-
zero capacity
-
bounded capacity
Pregunta 25
Pregunta
A blocking send() and blocking receive() is known as a(n) _________________
Respuesta
-
rendezvous
-
asynchronous message
-
blocked message
-
synchronized message
Pregunta 26
Pregunta
____ is a thread library for Solaris that maps many user-level threads to one kernel thread.
Respuesta
-
Pthreads
-
Green threads
-
Java threads
-
Sthreads
Pregunta 27
Pregunta
In multithreaded programs, the kernel informs an application about certain events using a procedure known as a(n) ____.
Respuesta
-
event handler
-
signal
-
upcall
-
pool
Pregunta 28
Pregunta
_____ is not considered a challenge when designing applications for multicore systems.
Respuesta
-
Identifying data dependencies between tasks.
-
Determining if data can be separated so that it is accessed on separate cores
-
Ensuring there is a sufficient number of cores
-
Deciding which activities can be run in parallel
Pregunta 29
Pregunta
A ____ provides an API for creating and managing threads.
Respuesta
-
thread library
-
multithreading model
-
multicore system
-
set of system calls
Pregunta 30
Pregunta
The _____ model multiplexes many user-level threads to a smaller or equal number of kernel threads.
Respuesta
-
one-to-one
-
many-to-one
-
two-level
-
many-to-many
Pregunta 31
Pregunta
The _____ model maps many user-level threads to one kernel thread.
Respuesta
-
two-level
-
many-to-many
-
one-to-one
-
many-to-one
Pregunta 32
Pregunta
The _____ model maps each user-level thread to one kernel thread.
Respuesta
-
many-to-one
-
many-to-many
-
two-level
-
one-to-one
Pregunta 33
Pregunta
The _____ model allows a user-level thread to be bound to one kernel thread.
Respuesta
-
one-to-one
-
many-to-many
-
two-level
-
many-to-one
Pregunta 34
Pregunta
The most common technique for writing multithreaded Java programs is _____.
Respuesta
-
implementing the Runnable interface and defining its run() method
-
using the CreateThread() function
-
extending the Thread class and overriding the run() method
-
designing your own Thread class
Pregunta 35
Pregunta
In Pthreads, a parent uses the pthread_join() function to wait for its child thread to complete. What is the equivalent function in Win32?
Respuesta
-
join()
-
WaitForSingleObject()
-
win32_join()
-
wait()
Pregunta 36
Pregunta
Which of the following statements regarding threads is false?
Respuesta
-
Sharing is automatically provided in Java threads.
-
Both Pthreads and Win32 threads share global data.
-
The start() method actually creates a thread in the Java virtual machine.
-
The Java method join() provides similar functionality as the WaitForSingleObject in Win32.
Pregunta 37
Pregunta
Pthreads refers to ____.
Respuesta
-
an API for process creation and synchronization.
-
the POSTFIX standard.
-
an implementation for thread behavior.
-
a specification for thread behavior.
Pregunta 38
Pregunta
A _____ uses an existing thread — rather than creating a new one — to complete a task.
Respuesta
-
lightweight process
-
thread pool
-
asynchronous procedure call
-
scheduler activation
Pregunta 39
Pregunta
Assuming the Java class Worker implements the Runnable interface. Which of the following statements creates a thread using the Worker class?
Respuesta
-
Thread worker = new Thread(new Worker());
-
Thread worker = new Runnable(new Worker());
-
Worker worker = new Worker();
-
Thread worker = new Thread();
Pregunta 40
Pregunta
Calling the start() method of a Java thread
Respuesta
-
only creates the thread
-
creates the thread and invokes its run() method
-
the start() method cannot be called directly
-
can be either "only creates the thread" or "the start() method cannot be called directly"
Pregunta 41
Pregunta
A thread is composed of a thread ID, program counter, register set, and heap.
Respuesta
- True
- False
Pregunta 42
Pregunta
Virtually all contemporary operating systems support kernel threads.
Respuesta
- True
- False
Pregunta 43
Pregunta
Linux distinguishes between processes and threads.
Respuesta
- True
- False
Pregunta 44
Pregunta
Cancellation points are associated with ____ cancellation.
Respuesta
-
asynchronous
-
deferred
-
non-deferred
-
synchronous
Pregunta 45
Pregunta
In Java, data shared between threads is simply declared globally.
Respuesta
- True
- False
Pregunta 46
Pregunta
Each thread has its own register set and stack.
Respuesta
- True
- False
Pregunta 47
Pregunta
Deferred cancellation is preferred over asynchronous cancellation.
Respuesta
- True
- False
Pregunta 48
Pregunta
The single benefit of a thread pool is to control the number of threads.
Respuesta
- True
- False
Pregunta 49
Pregunta
It is possible to create a thread library without any kernel-level support.
Respuesta
- True
- False
Pregunta 50
Pregunta
Which of the following would be an acceptable signal handling scheme for a multithreaded program?
Respuesta
-
Deliver the signal to every thread in the process.
-
Deliver the signal to the thread to which the signal applies.
-
All of the above
-
Deliver the signal to only certain threads in the process.
Pregunta 51
Pregunta
Signals can be emulated in windows through ____.
Respuesta
-
none of the above
-
local procedure calls
-
asynchronous procedure calls
-
remote procedure calls
Pregunta 52
Pregunta
Thread-specific data is data that ____.
Respuesta
-
has been modified by the thread, but not yet updated to the parent process
-
is generated by the thread independent of the thread's process
-
is not associated with any process
-
is copied and not shared with the parent process
Pregunta 53
Pregunta
LWP is ____.
Respuesta
-
placed between system and kernel threads
-
common in systems implementing one-to-one multithreading models
-
short for lightweight processor
-
placed between user and kernel threads
Pregunta 54
Pregunta
Windows XP uses the ____.
Respuesta
-
many-to-many model
-
one-to many-model
-
many-to-one model
-
one-to-one model
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