15、C++并发与并行编程：任务、同步原语详解

C++并发与并行编程：任务、同步原语详解

1. 线程执行状态与任务的引入

在C++编程中，常常会遇到多个线程同时工作的情况，例如：

Thread with id 1 is currently working. 
Thread with id 2 is currently working. 
Thread with id 0 is currently working. 
Thread with id 1 is currently working. 
Thread with id 0 is currently working. 
Thread with id 2 is currently working. 
Thread with id 1 is currently working. 
Thread with id 0 is currently working. 
Thread with id 2 is currently working. 
Main thread just requested stop! 
Thread with id 1 is now stopped! 
Thread with id 0 is now stopped! 
Thread with id 2 is now stopped!

在了解了C++中停止线程执行的两种机制后，接下来探讨如何在多个线程之间共享数据。在并行执行中，建议从任务的角度思考，而非线程。线程是关于机器如何工作的技术实现概念，而任务是更实用的工作概念，通常更易于理解和提供更好的抽象。

2. C++中的任务

在C+