15 Coordination questions from the Concurrency bank, written for Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd.
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A.a synchronization point where each participating thread must arrive and wait until all others reach it before any may proceed
B.a pattern where one set of tasks generates items into a shared buffer while another set removes and processes them, decoupled by that buffer
C.a primitive that lets a thread sleep until notified that some predicate over shared state may have become true, releasing its lock while waiting
D.a one-shot gate that holds threads until a count reaches zero, after which it stays open permanently and cannot be reset
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2. Which term means: "a primitive that lets a thread sleep until notified that some predicate over shared state may have become true, releasing its lock while waiting"?
Mid
A.Latch
B.Producer-consumer
C.Condition variable
D.Barrier
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3. Which statement is correct?
Mid
A.Condition variable — a one-shot gate that holds threads until a count reaches zero, after which it stays open permanently and cannot be reset
B.Condition variable — a pattern where one set of tasks generates items into a shared buffer while another set removes and processes them, decoupled by that buffer
C.Condition variable — a primitive that lets a thread sleep until notified that some predicate over shared state may have become true, releasing its lock while waiting
D.Condition variable — a synchronization point where each participating thread must arrive and wait until all others reach it before any may proceed
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4. What is Barrier?
Mid
A.a one-shot gate that holds threads until a count reaches zero, after which it stays open permanently and cannot be reset
B.an event where a waiting thread resumes without being signaled, which is why waits should re-check their predicate inside a loop
C.a synchronization point where each participating thread must arrive and wait until all others reach it before any may proceed
D.a pattern where one set of tasks generates items into a shared buffer while another set removes and processes them, decoupled by that buffer
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5. Which term means: "a synchronization point where each participating thread must arrive and wait until all others reach it before any may proceed"?
Mid
A.Barrier
B.Condition variable
C.Latch
D.Producer-consumer
Answer + AI explanation with Pro
6. Which statement is correct?
Mid
A.Barrier — a synchronization point where each participating thread must arrive and wait until all others reach it before any may proceed
B.Barrier — an event where a waiting thread resumes without being signaled, which is why waits should re-check their predicate inside a loop
C.Barrier — a pattern where one set of tasks generates items into a shared buffer while another set removes and processes them, decoupled by that buffer
D.Barrier — a primitive that lets a thread sleep until notified that some predicate over shared state may have become true, releasing its lock while waiting
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7. What is Latch?
Mid
A.a primitive that lets a thread sleep until notified that some predicate over shared state may have become true, releasing its lock while waiting
B.a one-shot gate that holds threads until a count reaches zero, after which it stays open permanently and cannot be reset
C.a synchronization point where each participating thread must arrive and wait until all others reach it before any may proceed
D.an event where a waiting thread resumes without being signaled, which is why waits should re-check their predicate inside a loop
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8. Which term means: "a one-shot gate that holds threads until a count reaches zero, after which it stays open permanently and cannot be reset"?
Mid
A.Latch
B.Condition variable
C.Spurious wakeup
D.Producer-consumer
Answer + AI explanation with Pro
9. Which statement is correct?
Mid
A.Latch — a synchronization point where each participating thread must arrive and wait until all others reach it before any may proceed
B.Latch — an event where a waiting thread resumes without being signaled, which is why waits should re-check their predicate inside a loop
C.Latch — a pattern where one set of tasks generates items into a shared buffer while another set removes and processes them, decoupled by that buffer
D.Latch — a one-shot gate that holds threads until a count reaches zero, after which it stays open permanently and cannot be reset
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10. What is Producer-consumer?
Junior
A.an event where a waiting thread resumes without being signaled, which is why waits should re-check their predicate inside a loop
B.a pattern where one set of tasks generates items into a shared buffer while another set removes and processes them, decoupled by that buffer
C.a synchronization point where each participating thread must arrive and wait until all others reach it before any may proceed
D.a one-shot gate that holds threads until a count reaches zero, after which it stays open permanently and cannot be reset
Answer + AI explanation with Pro
11. Which term means: "a pattern where one set of tasks generates items into a shared buffer while another set removes and processes them, decoupled by that buffer"?
Junior
A.Barrier
B.Condition variable
C.Latch
D.Producer-consumer
Answer + AI explanation with Pro
12. Which statement is correct?
Junior
A.Producer-consumer — an event where a waiting thread resumes without being signaled, which is why waits should re-check their predicate inside a loop
B.Producer-consumer — a pattern where one set of tasks generates items into a shared buffer while another set removes and processes them, decoupled by that buffer
C.Producer-consumer — a synchronization point where each participating thread must arrive and wait until all others reach it before any may proceed
D.Producer-consumer — a primitive that lets a thread sleep until notified that some predicate over shared state may have become true, releasing its lock while waiting
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13. What is Spurious wakeup?
Mid
A.an event where a waiting thread resumes without being signaled, which is why waits should re-check their predicate inside a loop
B.a synchronization point where each participating thread must arrive and wait until all others reach it before any may proceed
C.a primitive that lets a thread sleep until notified that some predicate over shared state may have become true, releasing its lock while waiting
D.a one-shot gate that holds threads until a count reaches zero, after which it stays open permanently and cannot be reset
Answer + AI explanation with Pro
14. Which term means: "an event where a waiting thread resumes without being signaled, which is why waits should re-check their predicate inside a loop"?
Mid
A.Barrier
B.Spurious wakeup
C.Condition variable
D.Latch
Answer + AI explanation with Pro
15. Which statement is correct?
Mid
A.Spurious wakeup — a synchronization point where each participating thread must arrive and wait until all others reach it before any may proceed
B.Spurious wakeup — an event where a waiting thread resumes without being signaled, which is why waits should re-check their predicate inside a loop
C.Spurious wakeup — a primitive that lets a thread sleep until notified that some predicate over shared state may have become true, releasing its lock while waiting
D.Spurious wakeup — a pattern where one set of tasks generates items into a shared buffer while another set removes and processes them, decoupled by that buffer
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