CountDownLatch
- allows one or more threads to wait for a set of events to occur
- A type of Synchronizer
- initializes a counter - A number of events to wait for
- has a countdown method, which decrements the counter - indicates an event has occurred
- has an await method, which waits for counter to reach 0 - indicates all events have occurred
await method blocks until the counter reaches 0
During the block, waiting thread is interrupted or times out.
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