How many variables are used in Peterson's algorithm for synchronisation of two…

Peterson's algorithm for two processes utilizes three shared variables. These are two flag arrays indicating process intent and a single turn variable to manage access.

Peterson’s Algorithm for synchronization of two processes uses 3 shared variables:

1. flag[2] → an array of 2 boolean variables to indicate whether a process wants to enter the critical section.

2. turn → an integer variable to decide whose turn it is.

So, total variables used = 2 flag variables + 1 turn variable = 3 variables.