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Readers who write are defined as follows: there is a lot of processes sharing data, this data can be either a file or memory space; some only read the data process (Reader) and some just write process data area (Writer), there is also need to meet the following conditions: (1) any number of readers can read both this document; (2) write request can be written into the file at a time; (3) If a write process is to do, prohibit any reading level files.
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