问题描述
Visual Studio 2015的std :: thread是否在内部基于PPL的任务系统的实现？
Is the implementation of Visual Studio 2015's std::thread internally based on PPL's task system?
我的问题的背景是，使用std是否有意义:: thread用于多个任务，因为它们已经在公共线程池上平衡地执行了，还是通过PPL任务执行任务更好？
The background of my question is, does it make sense to use std::thread for several tasks, because they are already executed balanced on the common threadpool, or is it better to execute the tasks via PPL tasks?
根据（）这似乎是，但是由于这个问题已经很老了，我想得到一个官方答案。
According to (Which std::async implementations use thread pools?) this seems to be, but since the question is rather old I would like to get an "official" answer.
推荐答案
是，不是。
用于 std :: thread ：
std :: thread 构造函数（线程文件）调用
_Launch （ xthread 文件）调用
_Thrd_startX （ xthread 文件），调用
_Thrd_start （ cthread。 c 文件）调用
_beginthreadex （ cthread.c 文件）。
for std::thread:std::thread constructor (thread file) calls_Launch (xthread file) which calls
_Thrd_startX (xthread file) which calls
_Thrd_start(cthread.c file) which calls
_beginthreadex (cthread.c file).
我没有 _beginthreadex 代码，但是在文件中atlbase.h ，一些微软开发人员留下了以下评论：
I don't have _beginthreadex code, but in the file atlbase.h, some microsoft developer left the following comment :
// _beginthreadex calls CreateThread which will set the last error
// value before it returns.
所以没有PPL。
so no PPL involed.
但是， std :: async 调用 concurrency :: create_task scens，然后它将使用基于Windows API的线程池。
But, std::async calls concurrency::create_task behind the scens, and then it will use the windows API based thread pool.
我用过卡萨布兰卡使用PPL。我也独立使用PPL。
我一点都不喜欢表演。我自己的线程池+ std :: future + std :: promise 比 concurrency :: task 对象。与C＃版本 TPL 相比，它确实不足。如果性能对于该项目无关紧要，我只会使用它。
I have used Casablanca which uses PPL. I also played with PPL as standalone.
I don't like it at all performance wise. my own threadpool + std::future + std::promise were literally houndered times faster than concurrency::task objects. It is really falls short against the C# version TPL. I would only use it if performace does not matter for that project.
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