Quizzes 2nd LE

Question 1

Complete command line to display threads in a process using ps

Answer 1

ps -T -p

Question 2

Give one benefit of threads

Answer 2

Resource sharing
Responsiveness
Economy
Scalability

Question 3

It is possible to provide concurrencybin a single core system. True or False?

Answer 3

True

Question 4

What are the two thingsbthat are unique to a thread?

Answer 4

Stack and register

Question 5

Give one example of a thread library

Answer 5

Posix Pthread
windows threads
Java threads

Question 6

Give one example of a specification to support implicit threading

Answer 6

OpenMP
Grand central dispatch
Thread pools

Question 7

Used in unix to notify a process about an event

Answer 7

Signals

Question 8

In what scenarios are thread local storage useful

Answer 8

When using implicit threading such as thread pools wherein creation of threads is not managed by the programmer

Question 9

The scenario in which concurrent access by processes/threads to a shared resource results to inconsistencies

Answer 9

Race condition

Question 10

Part of the code wherein only one process/thread is allowed to execute at a given time

Answer 10

Critical condition

Question 11

Mutex locks that require busy waiting

Answer 11

Spinlocks

Question 12

In test-and-set hardware sync, what value is returned

Answer 12

Original value

Question 13

What x86 instruction is used in compare-and-swap

Answer 13

Compare_and_swap()

Question 14

We can use a semaphore in place of a mutex lock

Answer 14

True

Question 15

A situation where a process may never be removed from the semaphore queue in which it is suspended

Answer 15

Starvation