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:

Courts of Chancery

Traditional courts dealing with equity, trusts, estates, and guardianships, distinct from courts of law.

Court of Chancery

A court historically dealing with matters of equity, including trusts, estates, and breaches of fiduciary duty, operating with a foundation in principles of fairness.

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