Question at position 13 A condition variable is used to block threads until a particular condition is true. It allows threads to wait without continuously checking the condition (busy waiting), reducing CPU usage and improving efficiency.TrueFalse单项选择题
A
True
B
False

Question

Question at position 13 A condition variable is used to block threads until a particular condition is true. It allows threads to wait without continuously checking the condition (busy waiting), reducing CPU usage and improving efficiency.TrueFalse单项选择题

A

True

B

False

BlackTom AI · Accepted Answer

Question: A condition variable is used to block threads until a particular condition is true. It allows threads to wait without continuously checking the condition (busy waiting), reducing CPU usage and improving efficiency. True/False

Option 1: True. This statement is accurate. Condition variables are synchronization primitives that enable threads to wait for a condition to become true without active spinning. They work in conjunction with a mutex; a thread waits on the condition variable, releasing the associated mutex while waiting, and wakes up when another thread signals the condition variable, at which point the waiting thread reacquires the mutex and rechecks the condition. This mechanism prevents busy-waiting and reduces CPU usage, aligning with the described behavior.

Option 2: False. This would be correct only if condition variables did not exist or could not block threads efficiently. However, the core purpose of condition variables is exactly to block threads efficiently until a condition is satisfied, avoiding busy-wait loops. Therefore, labeling this as false would contradict the established semantics of condition variables and their typical usage pattern in multithreaded programming.

Question at position 13 A condition variable is used to block threads until a particular condition is true. It allows threads to wait without continuously checking the condition (busy waiting), reducing CPU usage and improving efficiency.TrueFalse单项选择题

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