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Peterson’s Solution in operating System

Posted on December 10, 2021December 10, 2021 By christo No Comments on Peterson’s Solution in operating System

Peterson’s solution is restricted to two processes that alternate execution between their critical sections and remainder sections. The processes are numbered P0 and P1. For convenience, when presenting Pi , we use Pj to denote the other process; that is, j equals 1 − i.

The structure of process Pi in Peterson’s solution

do {
flag[i] = true;
turn = j;
while (flag[j] && turn == j);
critical section
flag[i] = false;
remainder section
} while (true);

Peterson’s solution requires the two processes to share two data items:

int turn;
boolean flag[2];

The variable turn indicates whose turn it is to enter its critical section. That is, if turn == i, then process Pi is allowed to execute in its critical section. The flag array is used to indicate if a process is ready to enter its critical section. For example, if flag[i] is true, this value indicates that Pi is ready to enter its critical section

operating system Tags:Peterson’s Solution

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