Inter-process communication and concurrency

Question 1

IPC

Answer 1

Processes often need to communicate to perform overall task, while maintaining system integrity.

Question 2

Common Storage

Answer 2

Processes often work together by sharing common storage, however sometimes processes start using shared data before another process is finished with it; losing data/updates.

Question 3

Critical Region/Section

Answer 3

Where processes access shared data. Mutual exclusion is needed in these sections

Question 4

Mutual Exclusion by Disabling Interrupts

Answer 4

No interrupts = no clock interrupts and no other process can be scheduled giving exclusive access to CPU.

Question 5

Mutual exclusion with busy waiting

Answer 5

Busy waiting = loop doing nothing in program code.

Set while loop condition to true when in critical region, then false when leaving critical region