please read the question a similar one has already been posted by me, this question is not the same

Assuming we have the following 3 processes trying to access 6 resources.

We know deadlock is possible. How can you change the order of resource requests so that there is no deadlock? Obviously, the critical region of each process cannot be changed, therefore, it must be ensured that all required resources are actually acquired.

void P2() void PO () { while (true) { get (A); get (B); get (C); // critical region: // use A, B, C release (A) ; release (B); release (C); } } void P1 () { while (true) { get (D); get (E); get (B); // critical region: // use D, E, B release (D); release (E) ; release (B); } } while (true) { get (C); get (F); get (D); // critical region: // use C, F, D release (C); release (F); release (D); } void P2() void PO () { while (true) { get (A); get (B); get (C); // critical region: // use A, B, C release (A) ; release (B); release (C); } } void P1 () { while (true) { get (D); get (E); get (B); // critical region: // use D, E, B release (D); release (E) ; release (B); } } while (true) { get (C); get (F); get (D); // critical region: // use C, F, D release (C); release (F); release (D); }