blocks|key|5455250|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5455251|何时在C%2B%2B?`中使用多线程|blockquote|5455252|5455253|5455254|嗯-一般的经验法则是:当它可以加速你的应用程序时，就使用它。答案并不是真正依赖于语言。|5455255|如果你想得到一个深入的答案，那么你必须考虑一些事情：|5455256|5455257|是不是可以在你的代码中实现多线程？您是否有可以同时计算的片段，是否独立于其他值得实现的calculations?|ordered-list-item|5455258|Is多线程？即使你尽了最大的努力让你的代码运行在支持possible?|offset|length|style|BOLD|5455259|Will多线程的机器上(所以有多个处理单元)，你的程序还是运行慢吗？如果你正在为只有一个核心的机器设计代码，使用多线程是浪费时间。|5455260|有different选项吗？更好的算法，清理代码，等等？如果是这样的话-也许用它来代替multithreading?|5455261|Do更好，你必须处理那些很难及时预测的事情，而整个应用程序必须不断运行？例如-从游戏中的服务器接收一些信息-|5455262|5455263|entityMap^0|0|0|0|0|0|0|0|0|5|U|0|0|1T|0|0|1M|0|0|1I|0|0^^$0|@$1|2|3|-4|4|5|6|12|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|13|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|14|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|15|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|16|7|@]|8|@]|9|$]]|$1|H|3|I|4|5|6|17|7|@]|8|@]|9|$]]|$1|J|3|-4|4|5|6|18|7|@]|8|@]|9|$]]|$1|K|3|L|4|M|6|19|7|@]|8|@]|9|$]]|$1|N|3|O|4|M|6|1A|7|@$P|1B|Q|1C|R|S]]|8|@]|9|$]]|$1|T|3|U|4|M|6|1D|7|@$P|1E|Q|1F|R|S]]|8|@]|9|$]]|$1|V|3|W|4|M|6|1G|7|@$P|1H|Q|1I|R|S]]|8|@]|9|$]]|$1|X|3|Y|4|M|6|1J|7|@$P|1K|Q|1L|R|S]]|8|@]|9|$]]|$1|Z|3|-4|4|5|6|1M|7|@]|8|@]|9|$]]|$1|10|3|-4|4|5|6|1N|7|@]|8|@]|9|$]]]|11|$]]

<blockquote>
 When to use multithreading in C++?`
</blockquote>

Well - the general rule of thumb is: use it when it can speed up your application. The answer isn't really language-dependant.

If you want to get an in-depth answer, then you have to consider a few things:

<ol>
<li>Is multithreading possible to implement inside your code? Do you have fragments which can be calulated at the same time and are intependent of other calculations?</li>
<li>Is multithreading worth implementing? Does your program run slow even when you did all you could to make it as fast as possible?</li>
<li>Will your code be run on machines that support multithreading (so have multiple processing units)? If you're designing code for some kind of machine with only one core, using multithreading is a waste of time.</li>
<li>Is there a different option? A better algorithm, cleaning the code, etc? If so - maybe it's better to use that instead of multithreading?</li>
<li>Do you have to handle things that are hard to predict in time, while the whole application has to constantly run? For example - receiving some information from a server in a game?</li>
</ol>

blocks|key|2291992|text|当你有资源密集型的任务，比如大量的数学计算，或者I/O密集型的任务，比如读或者写文件，你应该使用多线程。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2291993|目的应该是，你可以一起运行多个东西(任务)，这样它将提高你的应用程序的性能和响应能力。此外，在应用程序中实现多线程之前，请先了解同步。|2291994|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

When you have resource intensive task like huge mathematical calculation , or I/O intensive task like reading or writing to file, use should your multithreading. 

Purpose should be, you can be able to run multiple things (tasks) together, so that it will increase performance and responsiveness of your application. Also, learn about synchronization before implementing multithreading in your application.

blocks|key|3343072|text|多线程是多任务的一种特殊形式，而多任务是允许计算机同时运行两个或更多程序的功能。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3343073|我认为这个链接可以帮助你。|3343074|http://www.tutorialspoint.com/cplusplus/cpp_multithreading.htm|offset|length|3343075|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|1Q|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@$F|R|G|S|1|T]]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|E]]]]

Multithreading is a specialized form of multitasking and a multitasking is the feature that allows your computer to run two or more programs concurrently.

I think this link can help you. 

<a href="http://www.tutorialspoint.com/cplusplus/cpp_multithreading.htm" rel="nofollow">http://www.tutorialspoint.com/cplusplus/cpp_multithreading.htm</a>

blocks|key|5455052|text|主要是当你想同时做一些事情的时候。例如，当一个关卡在游戏中加载时，或者当你一次下载多个文件时，你可能想要一个窗口来响应用户的输入，等等。当然，两者都可能会因此变慢，但它确实给人一种同时发生多件事情的错觉。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5455053|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Mostly when you want things to be done at the same time. For instance, you may want a window to still respond to user input when a level is loading in a game or when you're downloading multiple files at once, etc. It's for things that really can't wait until other processing is done. Of course, both probably go slower as a result, but it really gives the illusion of multiple things happening at once.

blocks|key|377265|text|这是一个稍微主观的主题..。但我倾向于在以下两种情况中使用多线程。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|377266|1-在性能关键的情况下，需要最大的功率(算法当然支持并行性)，对我来说，矩阵乘法。|377267|2-极少数情况下，让一个线程管理相对独立的东西可能更容易。经典的是网络，也许有一个线程阻塞等待连接，并产生线程来管理每个线程的到来。这很有用，因为线程可以及时阻塞和响应。假设你有一个服务器，一个请求可能需要很慢的磁盘访问，当第一个线程等待数据时，另一个线程可以跳转到另一个字段中另一个请求。|377268|正如其他人所说的那样，只有当你需要考虑这样做的时候，它才会变得很复杂，并且很难调试。|377269|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

This is a slightly subjective subject... But I tend to use multi-threading in one of two situations.

1 - In a performance critical situation where the utmost power is needed (and the algorithm of course supports parallelism), for me, matrix multiplications.

2 - Rarely where it may be easier to have a thread managing something fairly independent. The classic is networking, perhaps have a thread blocking waiting for connections and spawning threads to manage each thread as it comes in. This is useful as the threads can block and respond in a timely manner. Say you have a server, one request might need disk access which is slow, another thread can jump in an field a different request while the first is waiting for its data.

As has been said by others, only when you need to should you think about doing it, it gets complicated fast and can be difficult to debug.

blocks|key|2292014|text|当你可以通过并行处理来加速你的算法时，可以使用多线程。当线程需要访问父进程的资源时，使用它与多处理相反。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2292015|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Use multithreading when you can speed up your algorithms by doing things in parallel. Use it in opposition to multiprocessing when the threads need access to the parent process's resources.

blocks|key|5455285|text|我的两点意见。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5455286|使用案例：|5455287|5455288|将您的应用程序集成到已经运行循环的库/应用程序中。如果不能集成到其他应用程序中，您将需要自己的线程来并发运行您的代码。|ordered-list-item|5455289|任务拆分。有时在线程中组织不相交的任务是有意义的，比如在example.|5455290|Performance.中分离声音和图像处理当您想要提高某些任务的吞吐量时。|5455291|5455292|建议：|5455293|5455294|在一般情况下，如果单线程解决方案就足够了，就不要进行多线程。它增加了所需的complexity.|5455295|When，从可能的高阶原语开始，如std::async.|offset|length|5455296|When和std::future，避免了数据共享，这是the走向低级抽象的根源，如互斥锁等，并将其封装在某种模式中。您可以从线程中查看these+slides.|5455297|Decouple您的函数，并在稍后将线程组合到函数中。也就是说，不要将线程创建嵌入到代码的逻辑中。|5455298|5455299|entityMap|0|LINK|mutability|MUTABLE|url|http://en.cppreference.com/w/cpp/thread/async|1|http://en.cppreference.com/w/cpp/thread/future|2|https://onedrive.live.com/view.aspx?resid=F1B8FF18A2AEC5C5!1176&cid=f1b8ff18a2aec5c5&app=WordPdf&wdo=2^0|0|0|0|0|0|0|0|0|0|0|H|A|0|0|5|B|1|1V|C|2|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1D|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|1F|8|@]|9|@]|A|$]]|$1|H|3|I|5|G|7|1G|8|@]|9|@]|A|$]]|$1|J|3|K|5|G|7|1H|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1J|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]|$1|P|3|Q|5|G|7|1L|8|@]|9|@]|A|$]]|$1|R|3|S|5|G|7|1M|8|@]|9|@$T|1N|U|1O|1|1P]]|A|$]]|$1|V|3|W|5|G|7|1Q|8|@]|9|@$T|1R|U|1S|1|1T]|$T|1U|U|1V|1|1W]]|A|$]]|$1|X|3|Y|5|G|7|1X|8|@]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1Z|8|@]|9|@]|A|$]]]|11|$12|$5|13|14|15|A|$16|17]]|18|$5|13|14|15|A|$16|19]]|1A|$5|13|14|15|A|$16|1B]]]]

My two cents.

Use cases:

<ol>
<li>Integrate your application in a lib/app that already runs a loop. You would need a thread of your own to run your code concurrently if you cannot integrate into the other app.</li>
<li>Task splitting. It makes sense to organize disjoint tasks in threads sometimes, such as in separating sound from image processing, for example.</li>
<li>Performance. When you want to improve the throghput of some task.</li>
</ol>

Recommendations:

<ol>
<li>In the general case, don't do multithreading if a single threaded solution will suffice. It adds complexity.</li>
<li>When needed, start with higher-order primitives, such as <a href="http://en.cppreference.com/w/cpp/thread/future" rel="nofollow">std::future</a> and <a href="http://en.cppreference.com/w/cpp/thread/async" rel="nofollow">std::async</a>.</li>
<li>When possible, avoid data sharing, which is the source of contention.</li>
<li>When going to lower level abstractions, such as mutexes and so on, encapsulate it in some pattern. You can take a look at <a href="https://onedrive.live.com/view.aspx?resid=F1B8FF18A2AEC5C5!1176&amp;cid=f1b8ff18a2aec5c5&amp;app=WordPdf&amp;wdo=2" rel="nofollow">these slides</a>.</li>
<li>Decouple your functions from threading and compose the threading into the functions at a later point. Namely, don't embed thread creation into the logic of your code.</li>
</ol>

I am C++ programmer (intermediate) and learning multi-threading now. I found it quite confusing when to use multi-threading in C++? How will i come to know that i need to use multi-threading in which part of section? 

<pre><code>When to use multithreading in C++?
</code></pre>

When to use multithreading in C++?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我是C++程序员(中级)，现在正在学习多线程。我发现在C++中什么时候使用多线程是非常令人困惑的？我如何知道我需要在节的哪个部分使用多线程？When to use multithreading in C++?

问什么时候在C++中使用多线程？
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