blocks|key|5620297|text|据我所知，标准库中没有任何东西支持这种性质的等待。标准库建立在底层操作系统线程支持的基础之上。标准库必然只能提供最低公分母的功能。这意味着它不能包装Win32线程库提供的一些更丰富的功能。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5620298|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|$]]

To the very best of my knowledge, there is nothing in the standard library that supports a wait of that nature. The standard library is built on top of the underlying operating system threading support. By necessity the standard library can only offer lowest common denominator functionality. Which means that it is not able to wrap some of the richer functionality offered by the Win32 threading library.

blocks|key|3508553|text|只需使用std::condition_variable，让您的线程在notify_all()或notify_one()完成之前触发它们。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3508554|然后在您想要调用WaitForMultipleObjects()的地方执行cv.wait()。|3508555|entityMap^0|4|N|Y|C|1B|C|0|8|O|11|9|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|I|$]]

Just use a <code>std::condition_variable</code> and have your threads fire <code>notify_all()</code> or <code>notify_one()</code> right before they finish.

Then do <code>cv.wait()</code> where you want your <code>WaitForMultipleObjects()</code> call.

blocks|key|458325|text|试试Async%2B%2B+Composition，它是N3428+C%2B%2B标准提案的参考实现。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|458326|这篇文章在此之前是相关的：|458327|Broken+promises–C%2B%2B0x+futures|458328|以一种不可移植的方式，您还可以调用std::thread::native_handle()来使用带有返回值的WaitForMultipleObjects。|style|CODE|458329|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Amanieu/asyncplusplus/wiki/Tutorial#wiki-composition|1|http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3428.pdf|2|http://bartoszmilewski.com/2009/03/03/broken-promises-c0x-futures/|3|http://en.cppreference.com/w/cpp/thread/thread/native_handle^0|2|J|0|O|5|1|0|0|0|T|2|0|1I|M|H|S|3|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]|$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|6|7|16|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|17|8|@]|9|@$A|18|B|19|1|1A]]|C|$]]|$1|H|3|I|5|6|7|1B|8|@$A|1C|B|1D|J|K]]|9|@$A|1E|B|1F|1|1G]]|C|$]]|$1|L|3|-4|5|6|7|1H|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]|T|$5|O|P|Q|C|$R|U]]|V|$5|O|P|Q|C|$R|W]]|X|$5|O|P|Q|C|$R|Y]]]]

Try <a href="https://github.com/Amanieu/asyncplusplus/wiki/Tutorial#wiki-composition" rel="nofollow">Async++ Composition</a> which is a reference implementation for the <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3428.pdf" rel="nofollow">N3428</a> C++ standard proposal.

This article is relevant before that:

<a href="http://bartoszmilewski.com/2009/03/03/broken-promises-c0x-futures/" rel="nofollow">Broken promises–C++0x futures</a>

In an unportable way you can also call <a href="http://en.cppreference.com/w/cpp/thread/thread/native_handle" rel="nofollow">std::thread::native_handle()</a> to use <code>WaitForMultipleObjects</code> with the return.

blocks|key|5620359|text|这里有一个示例，说明如何使用std::thread和std::future实现相同的效果，前提是您愿意让主线程休眠，同时轮询线程的就绪性(或者，您可以让专用线程处理等待)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5620360|考虑以下函数，将一系列迭代器带到std::future容器，该容器将阻塞，直到至少一个任务完成：|5620361|const+int+TIME_BETWEEN_POLLS_MS+=+50;

//+Wait+(sleep)+between+polls+until+a+task+is+finished+then+return+iterator+to+future.
template+<typename+Iterator>
Iterator+waitForFirst(Iterator+first,+Iterator+last)+{
++++auto+it+=+first;
++++auto+status+=+std::future_status::timeout;
++++while+(status+!=+std::future_status::ready)+{
++++++++if+(%2B%2Bit+==+last)+{+//+Rotate+in+range.
++++++++++++it+=+first;
++++++++}
++++++++status+=+it->wait_for(std::chrono::milliseconds(TIME_BETWEEN_POLLS_MS));
++++}
++++return+it;
}|code-block|syntax|javascript|5620362|现在，如果您有一个与在不同线程上运行的任务的返回值相关联的未来容器(std::future)，您可以简单地使用函数waitForFirst来获取指向未来的迭代器，该迭代器首先获得其结果。|5620363|++++//+Lets+say+you+have+a+vector+of+futures,+e.g.
++++std::vector<std::future<std::thread::id>>+futures;

++++/*+Push+futures+to+vector...+*/

++++//+Block+until+first+task+is+finished.
++++//+'it'+is+iterator+to+future+associated+with+result.
++++auto+it+=+waitForFirst(std::begin(futures),+std::end(futures));|5620364|请参阅|5620365|entityMap|0|LINK|mutability|MUTABLE|url|http://en.cppreference.com/w/cpp/thread/thread|1|http://en.cppreference.com/w/cpp/thread/future|2|3^0|E|B|Q|B|E|B|0|Q|B|1|0|G|B|G|B|2|0|0|Y|B|1L|C|Y|B|3|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@$9|19|A|1A|1|1B]|$9|1C|A|1D|1|1E]]|E|$]]|$1|F|3|G|5|6|7|1F|8|@$9|1G|A|1H|B|C]]|D|@$9|1I|A|1J|1|1K]]|E|$]]|$1|H|3|I|5|J|7|1L|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1M|8|@$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]]|D|@$9|1R|A|1S|1|1T]]|E|$]]|$1|O|3|P|5|J|7|1U|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1V|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1W|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]|10|$5|V|W|X|E|$Y|11]]|12|$5|V|W|X|E|$Y|11]]|13|$5|V|W|X|E|$Y|11]]]]

Here's an example of how you can achieve the same effect using <a href="http://en.cppreference.com/w/cpp/thread/thread" rel="nofollow noreferrer"><code>std::thread</code></a> and <a href="http://en.cppreference.com/w/cpp/thread/future" rel="nofollow noreferrer"><code>std::future</code></a> if you are willing to let the main thread sleep while polling the readiness of the threads (alternatively you could let a dedicated thread handle the waiting).
Consider this function, taking a range of iterators to a container of <a href="http://en.cppreference.com/w/cpp/thread/future" rel="nofollow noreferrer"><code>std::future</code></a>, which will block until at least one task is finished:
<pre><code>const int TIME_BETWEEN_POLLS_MS = 50;

// Wait (sleep) between polls until a task is finished then return iterator to future.
template &lt;typename Iterator&gt;
Iterator waitForFirst(Iterator first, Iterator last) {
 auto it = first;
 auto status = std::future_status::timeout;
 while (status != std::future_status::ready) {
 if (++it == last) { // Rotate in range.
 it = first;
 }
 status = it-&gt;wait_for(std::chrono::milliseconds(TIME_BETWEEN_POLLS_MS));
 }
 return it;
}
</code></pre>
Now if you have a container of futures (<a href="http://en.cppreference.com/w/cpp/thread/future" rel="nofollow noreferrer"><code>std::future</code></a>) associated with the return values of your tasks running on separate threads, you can simply use the function <code>waitForFirst</code> to get an iterator to the future that gets its result first.
<pre><code> // Lets say you have a vector of futures, e.g.
 std::vector&lt;std::future&lt;std::thread::id&gt;&gt; futures;

 /* Push futures to vector... */

 // Block until first task is finished.
 // 'it' is iterator to future associated with result.
 auto it = waitForFirst(std::begin(futures), std::end(futures));
</code></pre>
See <a href="http://coliru.stacked-crooked.com/a/1dfb87728994b184" rel="nofollow noreferrer">live example</a>

blocks|key|3508529|text|你想要的是等同于boost::thread_group的东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3508530|不存在，但您可以编写该功能:+std::vector和std::for_each，以便对每个元素调用join()/WaitForSingleObject，当然也可以搜索执行相同操作的第三方，如cppthreadpool|offset|length|3508531|entityMap|0|LINK|mutability|MUTABLE|url|https://code.google.com/p/cppthreadpool/^0|0|2O|D|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

What you want is something equivalent to boost::thread_group. 

Doesn't exist, but you can write that functionality: A std::vector and std::for_each to call join()/WaitForSingleObject on each element, or of course search for a 3rd party that does the same like <a href="https://code.google.com/p/cppthreadpool/" rel="nofollow">cppthreadpool</a>

My problem is that I have multiple threads, they are stored in some container, and I need to know when a thread at a certain position finished.
On windows I would do something like:

<pre><code>HANDLE handles[3];
//handles were initialized
DWORD finishingThread = WaitForMultipleObjects(3, handles, false, INFINITE)
</code></pre>

Is there any way to achieve the same effect with std::thread?

WaitForMultipleObjects alternative with std::thread?

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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我的问题是，我有多个线程，它们存储在某个容器中，我需要知道某个位置的线程何时结束。在windows上，我会这样做：HANDLE handles[3];//handles were initializedDWORD finishingThread = WaitForMultipleObjects(3, handles, false, INFINITE)有没有办法用std::thread达到同样的效果

问WaitForMultipleObjects替代std::thread？
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回答 5

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问WaitForMultipleObjects替代std::thread？EN

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问WaitForMultipleObjects替代std::thread？
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