#define FALSE 0
#define TRUE 1
#define N 2 /* number of processes */
int turn; /* whose turn is it? */
int interested[N]; /* all values initially 0 (FALSE) */
void enter region(int process); /* process is 0 or 1 */
{
int other; /* number of the other process */
other = 1 −process; /* the opposite of process */
interested[process] = TRUE; /* show that you are interested */
tur n =process; /* set flag */
while (turn == process && interested[other] == TRUE) /* null statement */ ;
}
void leave region(int process) /* process: who is leaving */
{
interested[process] = FALSE; /* indicate departure from critical region */
}