就这样一个简单的方法可以为用户释放更多的任务栏空间。
In this simple way, users are able to free up space on their Taskbar.
当第一个以写模式访问的用户释放文件后，队列顶部的用户就能以写模式访问。
When the first user with write access releases the file, the top-most user from the queue is then given the write mode access.
当用户释放内存时，就会检查 buddy 块，查看其相邻的内存块是否也已经被释放。
When memory is freed by the user, the buddy block is checked to see if any of its contiguous neighbors have also been freed.
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