本文详细介绍了NSAutoreleasePool的工作原理及其使用要点。包括：自动释放池如何管理对象的生命周期，为何不能保留或自动释放自动释放池本身，以及每个线程如何维护自己的自动释放池堆栈等关键概念。
1. In a reference-counted environment, an NSAutoreleasePool contains objects that have received autorelease message. When the pool drained, it sends release message to each of the objects.
2. The Application Kit creates an autorelease pool for [color=darkred]main thread [/color] at the beginning of every cycle of the event loop. We can create "local" autorelease pool.
3. Can [color=darkred]NOT[/color] retain or autorelease an autorelease pool.
4. Should always drain an autorelease pool in the same context that it was created.
4. Each thread maintains its own [color=darkred]stack[/color] of NSAutoreleasePool objects. When a thread terminates, it automatically drains all of the autorelease pools associated with itself.
2. The Application Kit creates an autorelease pool for [color=darkred]main thread [/color] at the beginning of every cycle of the event loop. We can create "local" autorelease pool.
3. Can [color=darkred]NOT[/color] retain or autorelease an autorelease pool.
4. Should always drain an autorelease pool in the same context that it was created.
4. Each thread maintains its own [color=darkred]stack[/color] of NSAutoreleasePool objects. When a thread terminates, it automatically drains all of the autorelease pools associated with itself.
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