Consider the methods used by processes P1 and P2 for accessing their critical…

Consider the methods used by processes P1 and P2 for accessing their critical sections whenever needed, as given below. The initial values of shared boolean variables S1 and S2 are randomly assigned.

$\begin{array}{|l|l|}\hline \textbf{Method used by P1} & \textbf{Method used by P2} \\ \hline \text{while (S1 == S2);} & \text{while (S1 != S2);} \\ \text{Critical Section} & \text{Critical Section} \\ \text{S1 = S2;} & \text{S2 = not(S1);} \\\hline \end{array}$

Which one of the following statements describes the properties achieved?