Advanced Python Programming

The second readers-writers problem

The problem with the first approach is that, when a reader is accessing the text file and a writer is waiting for the file to be unlocked, if another reader starts its execution and wants to access the file, it will be given priority over the writer that has already been waiting. Additionally, if more and more readers keep requesting access to the file, the writer will be waiting infinitely, and that was what we observed in our first code example.

To address this problem, we will implement the specification that, once a writer makes a request to access the file, no reader should be able to jump in line and access the file before that writer. To do this, we will have an additional lock object in our program, ...