What is the reader/writer problem in OS?

The readers-writers problem relates to an object such as a file that is shared between multiple processes. Some of these processes are readers i.e. they only want to read the data from the object and some of the processes are writers i.e. they want to write into the object.

What is true for Reader writer problem?

The readers-writers problem is a classical problem of process synchronization, it relates to a data set such as a file that is shared between more than one process at a time.

Which of the following is the first readers-writers problem?

The simplest one, referred to as the first readers-writers problem, requires that no reader be kept waiting unless a writer has already obtained permission to use the shared object.

What is writer starvation?

This means that a stream of readers can subsequently lock all potential writers out and starve them. This is so, because after the first reader locks the resource, no writer can lock it, before it gets released.

What is Peterson problem in OS?

Operating SystemWindowsMCA. Peterson’s solution provides a good algorithmic description of solving the critical-section problem and illustrates some of the complexities involved in designing software that addresses the requirements of mutual exclusion, progress, and bounded waiting.

What are the disadvantages of Peterson’s solution?

(i) This algorithm satisfies the “mutual exclusion”, “progress” and “bounded waiting” condition. ii) This algorithm has a flaw as the variable “turn” can be modified by both processes at the same time. iii) This algorithm may cause “deadlock” if both processes set their flags to True at the same time.

What is Readlock?

When a transaction reads a row, the isolation level of the transaction determines if a read lock is acquired. Once a row is read locked, no other transaction can obtain a write lock on it. Acquiring a read lock ensures that a different transaction does not modify or delete a row while it is being read.

What is a Rwlock?

In computer science, a readers–writer (single-writer lock, a multi-reader lock, a push lock, or an MRSW lock) is a synchronization primitive that solves one of the readers–writers problems. An RW lock allows concurrent access for read-only operations, write operations require exclusive access.