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No, it shouldn't.
Normally we can allow this also, but needs the synchronizing mechcanism.

For a moment, letus say it shouldn't.

Hi, I have two tasks 'Read' and 'Write' which reads and writes on a file "abc.txt" respectively.
Now I need to restrict the Write operation on the file while Read is going on, But can allow two...

user seperate Threads for each operation.

Hi, Create a thread to receive (msgrcv) the response.
Wait for certain time (letus say 5sec).
Send a reply (msgsnd) if and only if a flag is set to Success within this thread, after that much wait...