什么是IOS保留在后端 [英] What is IOS retain do at backend

问题描述

考虑我正在分配一个对象。请参阅下面的图片

Consider I am allocating an object. Please see the below image

在上面的图片中* myObject是一个指针。它指的是分配给该对象的空间。当我们保留对象时，我喜欢知道它在后端做什么。

In the above image *myObject is a pointer. It is referring to an space allocated to that object. When we retain the object, I like to know what it does at backend. Also I like to know why we are doing that.

也是当我们发布它在后台如何工作时。

Also when we release it how it works at backend.

我也想知道当我们复制对象时在后端会发生什么。

I also like to know what happens at backend when we copy an object.

我真的很抱歉，如果我的问题是这么基础。

I am really sorry if my question is so basic.

推荐答案

实际保留的内容是：

1. 在objc运行时执行全局锁定


2. 根据指向要保留的对象的指针查找哈希表条目


3. 增加该条目中的计数器


4. 释放锁

1. Take a global lock in the objc runtime
2. Look up a hash table entry based on the pointer to the object being retained
3. Increment a counter in that entry
4. Release the lock

在实践中有所帮助，但我认为这是你要求的。

I don't expect this to be all that helpful in practice, but I think it's what you were asking for.

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