文件名称:read-and-write
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读者-写者的读写限制（包括读者优先和写者优先）
1）写-写互斥，即不能有两个写者同时进行写操作
2）读-写互斥，即不能同时有一个读者在读，同时却有一个写者在写
3）读读允许，即可以有2个以上的读者同时读-Readers- to read and write restrictions (including readers, priority, and the writer takes precedence)
A) write- write mutually exclusive, ie can not have two writers write
2) read- write mutex, that is not at the same time there is a reader in Reading, at the same time there is a writer writing
3) read the permit, which can have more than two readers simultaneously read
1）写-写互斥，即不能有两个写者同时进行写操作
2）读-写互斥，即不能同时有一个读者在读，同时却有一个写者在写
3）读读允许，即可以有2个以上的读者同时读-Readers- to read and write restrictions (including readers, priority, and the writer takes precedence)
A) write- write mutually exclusive, ie can not have two writers write
2) read- write mutex, that is not at the same time there is a reader in Reading, at the same time there is a writer writing
3) read the permit, which can have more than two readers simultaneously read
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读者与写者.txt
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