When two profiles matched the same object, the most specific profile took precedence and completely overrode the rights specified in the less specific profile.
如果有两个配置文件匹配相同对象，则最具体的配置文件将优先，并完全覆盖另一个配置文件中指定的权限。
2
The typical solution to a race condition is to ensure that your program has exclusive rights to something while it's manipulating it, such as a file, device, object, or variable.
As far as areader was concerned, once she bought a book, she got the same rights to it asshe got to any other physical object, like a potato or a shovel.