Deadlock in Integrated Computer Systems
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1
What does a system consist of in deadlock context?
Finite resources distributed among competing threads
2
What is the sequence of resource usage?
Request → Use → Release
3
When does deadlock occur?
When threads wait for resources held by each other
4
What is an example of a deadlock situation?
Dining philosophers problem
5
What tools are common sources of deadlock?
Mutex locks and semaphores
6
How many conditions must hold simultaneously for deadlock?
Four
7
What is mutual exclusion in deadlock?
At least one resource must be non-sharable
8
What is hold and wait?
A thread holding resources waits for additional resources
9
What is no preemption?
Resources cannot be forcibly taken; must be released voluntarily
10
What is circular wait?
Threads wait in a cycle where each holds a resource needed by the next
11
What is the most common OS strategy for deadlocks?
Ignore the problem
12
What is a drawback of ignoring deadlocks?
Performance deteriorates; system may stop and need restart
13
What is deadlock prevention?
Ensuring at least one of the four conditions does not hold
14
How can hold and wait be prevented?
Request all resources before execution or only when none are held
15
What is a disadvantage of hold and wait prevention?
Low resource utilization and possible starvation
16
What is deadlock avoidance?
Techniques to ensure the system never enters a deadlocked state
17
How does prevention differ from avoidance?
Prevention limits requests, avoidance uses information to decide dynamically
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