检测螺纹端 [英] Detect thread end

问题描述

如何检测线程何时结束(以与平台无关的方式)? 我必须为每个线程存储对象的副本，我想知道什么时候可以处理或重新分发它.

How can I detect when a thread was ended (in a platform independent way)? I have to store copies of objects for every thread and I want to know when I can dispose or redistribute it.

推荐答案

可能是通过RAII和local_thread机制实现的.我们创建一个类，在析构函数中做有用的工作.

It's possibly via RAII and local_thread mechanism. We create a class that do usefull work in destructor.

class ThreadEndNotifer
{
public:
    ~ThreadEndNotifer()
    {
        // Do usefull work
        useFullWork();
    }
}

接下来，我们创建local_thread变量.它可以是全局或类feild(thread_local类字段为隐式静态).

Next, we create local_thread variable. It can be global or class feild(thread_local class field is implicit static).

class Foo 
{
private:
    // Remember about initialization like static feild
    thread_local ThreadEndNotifer mNotifer; 
}

因此，每次线程结束时，都会调用useFullWork. 我喜欢创建一个全局变量并仅在需要时将其初始化，这样可以避免开销.

So, the useFullWork will be called every time when any thread are ending. I like to create one global variable and init it only if needed, in this way I avoid overhead.

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