The Term "Stale Data" Refers to a Situation in Multi-CPU

question 27

Multiple Choice

The term "stale data" refers to a situation in multi-CPU machines when one thread modifies shared data and a second thread accesses that data later, but sees the data value before the change took place. What is required to guarantee that the second thread sees the updated data, not stale data when access to the shared data occurs in two different methods?

• A)One method needs to acquire then release the lock after modifying the data.
• B)Both methods need to acquire then release the lock after modifying or reading the data.
• C)Never change any shared object data in multi-CPU machines.
• D)Never use locks for any shared data in multi-CPU machines.

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Definitions:

Amoral Behavior

When a person has no sense of right and wrong and no interest in the moral consequences of his or her actions.

Unethical Behavior

Actions that go against moral principles and professional standards, often resulting in unfair or dishonest practices.

Rules-Based

An approach or system that makes decisions or takes actions according to explicit rules or guidelines.

Artificial Intelligence

The simulation of human intelligence processes by machines, especially computer systems, including learning, reasoning, and self-correction.