blocks|key|2140219|text|您可以使用OSAtomicIncrement*/OSAtomicDecrement*操作(在使用原子运算中描述)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2140220|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/library/ios/DOCUMENTATION/Cocoa/Conceptual/Multithreading/ThreadSafety/ThreadSafety.html#//apple_ref/doc/uid/10000057i-CH8-SW14^0|5|I|O|I|1A|6|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

You can use the <code>OSAtomicIncrement*</code>/<code>OSAtomicDecrement*</code> operations described in <a href="http://developer.apple.com/library/ios/DOCUMENTATION/Cocoa/Conceptual/Multithreading/ThreadSafety/ThreadSafety.html#//apple_ref/doc/uid/10000057i-CH8-SW14" rel="noreferrer">Using Atomic Operations</a>.

blocks|key|2140152|text|更新：语言级原子在C11和C%2B%2B11下已经可用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2140153|您可以简单地声明_Atomic(int)+a;。|CODE|2140154|更详细的介绍。|2140155|原子操作及其文档可以在libkern/OSAtomic.h中找到。概述可以在man+atomic下面找到。|2140156|同样，您可能很快就会发现C11和C%2B%2B11语言/库支持。|2140157|entityMap|0|LINK|mutability|MUTABLE|url|http://www.informit.com/articles/article.aspx?p=1832575^0|0|3|0|8|F|0|0|6|0|0|B|I|12|A|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|H]]|D|@]|E|$]]|$1|I|3|J|5|6|7|12|8|@]|D|@$9|13|A|14|1|15]]|E|$]]|$1|K|3|L|5|6|7|16|8|@$9|17|A|18|B|H]|$9|19|A|1A|B|H]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1B|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

Update: Language level atomics under C11 and C++11 are now available.

You can simply declare <code>_Atomic(int) a;</code>.

<a href="http://www.informit.com/articles/article.aspx?p=1832575" rel="nofollow">A more detailed introduction</a>.

<hr>

atomic operations and their documentation can be found in <code>libkern/OSAtomic.h</code>. an overview can be found under <code>man atomic</code>.

as well, you will likely find C11 and C++11 language/library support very soon.

blocks|key|942873|text|Objective具有用于原子操作的关键字同步。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|942874|@synchronized(object)+{
++++//+...
}|code-block|syntax|javascript|942875|如果在属性声明中指定属性原子，则将使用这些同步块对setter和getter进行综合。|942876|还可以看看NSLock和NSLocking协议。|offset|length|style|CODE|942877|entityMap^0|0|0|0|5|6|C|9|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]|$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

Objective-C has the keyword synchronized for atomic operations.

<pre><code>@synchronized(object) {
 // ...
}
</code></pre>

If you specify the attribute atomic in a property declaration, the setters and getters will be sythesized using these synchronized-blocks.

Also look at <code>NSLock</code> and <code>NSLocking</code> protocol.

blocks|key|2140044|text|您可以查看属性(ObjectiveC+2.0特性)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2140045|@property+int+atomicProperty;|offset|length|style|CODE|2140046|事实上，没有“原子”说明符，因为属性默认为原子。它们可以设置为“非原子”。|2140047|http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/ObjectiveC/Articles/ocProperties.html|2140048|您也可能对@synchronized感兴趣。或者医生的这部分：|2140049|http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/Multithreading/ThreadSafety/ThreadSafety.html|2140050|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|T|0|0|0|30|0|0|5|D|0|0|38|1|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@$D|Z|E|10|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|12|8|@]|9|@$D|13|E|14|1|15]]|A|$]]|$1|L|3|M|5|6|7|16|8|@$D|17|E|18|F|G]]|9|@]|A|$]]|$1|N|3|O|5|6|7|19|8|@]|9|@$D|1A|E|1B|1|1C]]|A|$]]|$1|P|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|K]]|W|$5|S|T|U|A|$V|O]]]]

You can take a look at the properties (ObjectiveC 2.0 feature).

<code>@property int atomicProperty;</code>

There is in fact no 'atomic' specifier, as properties default to atomic. They can be set to 'nonatomic'.

<a href="http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/ObjectiveC/Articles/ocProperties.html" rel="nofollow">http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/ObjectiveC/Articles/ocProperties.html</a>

You may be interested by <code>@synchronized</code> also. Or this part of the doc:

<a href="http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/Multithreading/ThreadSafety/ThreadSafety.html" rel="nofollow">http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/Multithreading/ThreadSafety/ThreadSafety.html</a>

Are there interlocked(atomic) operations in iOS SDK? 

I need interlocked increment\decrement and interlocked comparsion. 

*UPDATE: * My main problem is waiting for few NSThreads created by main thread(main thread mustn't work while other threads work). 

I don't know how to do it.

Interlocked operations in iOS?

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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iOS SDK中是否存在互锁(原子)操作？我需要互锁增量\递减和互锁比较。*UPDATE：*我的主要问题是等待由主线程创建的少量NSThreads (主线程不能工作，而其他线程则不能工作)。我不知道怎么做。

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