11 - Quiz¶

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When a Go program starts, which statement is correct?

• A. Multiple goroutines are created automatically based on CPU cores.
• B. One OS thread and one goroutine are created per package.
• C. Only the main goroutine exists initially.
• D. No goroutine exists until go is used.

Which of the following best describes the fork–join pattern?

• A. A goroutine repeatedly spawns itself.
• B. Goroutines communicate only through shared memory.
• C. Threads are reused in a fixed pool.
• D. Multiple concurrent tasks are started and later synchronized.

What is the main purpose of sync.WaitGroup?

• A. To prevent race conditions.
• B. To enforce mutual exclusion.
• C. To wait for a collection of goroutines to finish.
• D. To limit the number of goroutines created.

Why must wg.Add(1) typically be called before starting the goroutine?

• A. Otherwise a subsequent wg.Wait() could happen before wg.Add(1).
• B. Otherwise the new goroutine cannot access the variable wg.
• C. Otherwise the goroutine runs sequentially.
• D. Otherwise the program will not compile.