Java concurrency: Countdown latch vs Cyclic barrier

Question

I was reading through the java.util.concurrent API, and found that

• CountDownLatch: A synchronization aid that allows one or more threads to wait

Answer 1

CountDownLatch is a count down of anything; CyclicBarrier is a count down for thread only

assume there are 5 worker threads and one shipper thread, and when workers produce 100 items, shipper will ship them out.

For CountDownLatch, the counter can be on workers or items

For CyclicBarrier, the counter can only on workers

If a worker falls infinite sleep, with CountDownLatch on items, Shipper can ship; However, with CyclicBarrier, Shipper can never be called