This lectures covers the entire core concepts of operating systems Circular wait topics.

1. Operating Systems by Muhammad Umair
Circular Wait
Inherited from Deadlock Conditions

2. Deadlock Visual Concept
Is it a state where two ore more operations are
waiting for each other, say a computing action
'A' is waiting for action 'B' to complete, while
action 'B' can only execute when 'A' is completed.

3. Cont..
• A deadlock happens in this case if Thread1 and
Thread2 are running simultaneously, and Thread1
acquires lock A and Thread2 acquires lock B. Then,
they both need the lock that the other thread has to
proceed. No advancement.
One way to deal with a case like this would be to
make a function which would grab two locks for a
thread simultaneously, instead of one at a time.

4. Circular wait
It only happens when there is
a processes which are waiting
for other resources to finish.

5. 4 Reasons of Deadlock
1: Mutual Exclusion
2 : Hold and Wait
3 : No Primitive
4 : Circular wait
Circular wait - Each process is waiting
to obtain a resource which is held by
another process.

6. • Thank
You