Operating System - Interview Questions and Answers for 'Thread states' | Search Interview Question

Operating System - Interview Questions and Answers for 'Thread states' - 7 question(s) found - Order By Newest

Frequently asked to fresh graduates.

Q1. Explain Thread States ?

Ans. Runnable - waiting for its turn to be picked for execution by the thread schedular based on thread priorities.

Running - The processor is actively executing the thread code. It runs until it becomes blocked, or voluntarily gives up its turn.

Waiting: A thread is in a blocked state while it waits for some external processing such as file I/O to finish.

Sleeping - Java threads are forcibly put to sleep (suspended) with Thread.sleep. they can resume using Thread.resume method.

Blocked on I/O - Will move to runnable after I/O condition like reading bytes of data etc changes.

Blocked on synchronization - Will move to Runnable when a lock is acquired.

Dead - The thread is finished working.

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Usually asked only to fresh graduates.

Q2. What is the initial state of a thread when it is created and started?

Ans. Ready state.

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Q3. What state does a thread enter when it terminates its processing?

Ans. When a thread terminates its processing, it enters the dead state.

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Q4. Difference between yield() and sleeping()?

Ans. When a task invokes yield(), it changes from running state to runnable state. When a task invokes sleep(), it changes from running state to waiting/sleeping state.

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Q5. What is the initial state of a thread when it is created and started ?

a. Wait
b. Running
c. Ready
d. Sleep

Ans. Ready

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Q6. What state does a thread enter when it terminates its processing?

a. Wait
b. Ready
c. Dead
d. Running

Ans. Dead

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Q7. Difference between Yielding and Sleeping ?

Ans. When a task invokes its yield method, it returns to the ready state. When a task invokes its sleep method, it returns to the waiting state.

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