Provides the ability to fork out to multiple parallel flows.
提供分叉为多个并行流的能力。
2
The role of the join action is to synchronize multiple threads of parallel execution started by fork actions.
join动作的功能是要同步fork动作启动的多个并行执行的线程。
3
This kind of parallel decomposition is often called fork-join because executing a task forks (starts) multiple subtasks and then joins (waits for completion) with them.