1 what is concurrency?

Question 1

Concurrency

Answer 1

Sharing of resources in the same time frame. E.g. CPU, memory, I/O-device.

Question 2

Communication

Answer 2

Convey information from one entity to another

Question 3

Interrupt

Answer 3

Hardware notification of event. Detection part of instruction cycle. Source may be external, internal timer, division by zero…

Question 4

Signal

Answer 4

Software notification of event. May be caused by interrupt handling.

Question 5

Signal is generated

Answer 5

when the event that causes the signal occurs

Question 6

Signal is caught

Answer 6

if the process that receives it, executes a handler for it.

Question 7

A signal that is generated by the process or thread that receives it

Answer 7

is generated synchronously

Question 8

Is a signal handler running concurrently?

Answer 8

Yes, at the very least concurrent with the main program.

Question 9

A call directly into the kernel

Answer 9

is a system call

Question 10

The programs that run in privileged mode

Answer 10

is the kernel

Question 11

With full access to system resources, a program runs in

Answer 11

privileged mode.

Question 12

reentrant function

Answer 12

Program function that is also a mathematical function

Question 13

Program function that is also a mathematical function

Answer 13

is a reentrant function

Question 14

A function that modifies local, static or global data

Answer 14

is a non-reentrant function

Question 15

A is a non-reentrant function

Answer 15

modifies local, static or global data

Question 16

reentrant substitute function

Answer 16

suffix _r

Question 17

suffix _r

Answer 17

reentrant substitute function