Question

In Operating Systems, which condition ensures that a process cannot be preempted from its resource until it completes its task?

• A. Mutual Exclusion
• B. Hold and Wait
• C. No Preemption
• D. Circular Wait

Hint:

Remember the four necessary conditions for deadlock using the mnemonic: {M H N C} → Mutual Exclusion, Hold and Wait, No Preemption, Circular Wait.

Answer 1

The Correct Option is C

Concept: In Operating Systems, deadlock occurs when a set of processes are blocked because each process is holding a resource and waiting for another resource held by another process. For a deadlock to occur, four necessary conditions must hold simultaneously:

• Mutual Exclusion
• Hold and Wait
• No Preemption
• Circular Wait

The condition described in the question corresponds to the No Preemption condition.
Step 1: Understand the No Preemption condition.
The No Preemption condition states that once a process acquires a resource, the operating system cannot forcibly take it away. The process must release the resource voluntarily after completing its task.
Step 2: Relate the condition to the question.
The question specifies that a process cannot be preempted from its resource until it completes its task. This directly matches the definition of the No Preemption condition.
Step 3: Conclusion.
Therefore, the operating system condition ensuring that a resource cannot be forcibly taken away from a process is: \[ \text{No Preemption} \]