Phaser doesn’t understand. What else do you learn about multithreading

In the previous article, we talked about the use of cyclicbarrier and countdownlatch. Here we review that countdownlatch is mainly used when a thread waits for multiple threads to complete execution, while cyclicbarrier is used when multiple threads wait for each other to complete execution.

Phaser is a new concurrency API introduced by Java 7. He introduced the new concept of phaser. We can regard it as a stage. Each stage has a thread task to be executed. After the task is executed, it enters the next stage. Therefore, phaser is especially suitable for repeated execution or reuse.

Basic use

Multiple phaser cycles