Concurrency

Question 1

Performing two or more tasks at the same time

Answer 1

Multitasking

Question 2

Two or more programs run in parallel (or
concurrently)

Answer 2

Multiprocessing

Question 3

One program that performs two or more tasks
(threads) at the same time

In thread-based multitasking, multiple threads
(multiple parts of one program) run concurrently

Answer 3

Multithreading

Question 4

a programming practice where more than one thread
runs within a program or process.

Answer 4

Multithreading

Question 5

Types of Multitasking

Answer 5

Multiprocessing & Multithreading

Question 6

Every running
application has at least one thread, the ______________.

Answer 6

main thread

Question 7

T or F:

Threads share the process’ resources, including
memory and open files.

Answer 7

T

Question 8

A thread that is started and waiting to be executed

Answer 8

Ready State

Question 9

A thread is being executed

Answer 9

Running State

Question 10

5 States of a Thread

Answer 10

Ready, Running, Suspended, Blocked, Terminated

Question 11

Execution is paused and can be resumed where it left
off

Answer 11

Suspended

Question 12

Thread is waiting for a request (I/O) to be completed or a resource cannot be accessed because it is being
used by another thread

Answer 12

Blocked

Question 13

Execution is stopped and cannot be resumed

Answer 13

Terminated

Question 14

Commonly Used Thread Methods

Answer 14

getName(), run(), sleep(), start(), join(), getPriority()

Question 15

Thread method that Suspends the thread; enables you to specify the period the thread is suspended

Answer 15

sleep();

Question 16

the entry point into the thread

Answer 16

run();

Question 17

Waits for the thread to die/finish

Answer 17

join();

Question 18

All implementing classes of runnable or those that extends the thread class must override this method.

Answer 18

run();

Question 19

2 Ways to create a Thread

Answer 19

Extending Thread class;

Kart extends Thread;

Implementing Runnable

Kart extends Runnable

Thread myKart = new Thread(new Kart(constructor));

Question 20

In Java, we use the _______________ keyword to lock a critical section.

Answer 20

synchronized

Question 21

A major concern in multithreading is when two or more
threads share the same resource. Only one of them
should access the resource at one time to avoid ___________________________.

Answer 21

data
consistency errors

Question 22

In Java, the keyword _________________ is used to limit the access (obtain lock) to a resource (object) to just one thread.

Answer 22

synchronized