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What is readers-writers problem?

Here we divide the processes into two types:

  1. Readers (Who want to retrieve the data only)

  2. Writers (Who want to retrieve as well as manipulate)

We can provide permission to a number of readers to read same data at same time.But a writer must be exclusively allowed to access. There are two solutions to this problem:

  1. No reader will be kept waiting unless a writer has already obtained permission to use the shared object. In other words, no reader should wait for other readers to complete simply because a writer is waiting.

  2. Once a writer is ready, that writer performs its write as soon as possible. In other words, if a writer is waiting to access the object, no new may start reading.