(A) any number of reading processes can simultaneously read the file (2) allows only one process to write the file to write (3) If a write process is written to the file, process or prohibit any read access to the file write process (4) writing process to perform a write operation, you should let the writers or readers have all quit. This shows that when a reader when reading the file does not allow writers to write files.

write and reader priority\write and reader priority.doc
write and reader priority

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