diff --git a/supervisor.c b/supervisor.c
index bcae659..880e8d3 100644
--- a/supervisor.c
+++ b/supervisor.c
@@ -29,9 +29,6 @@ void usage(void)
 
 void initCircBuf()
 {
-	shared->validItems = 0;
-	shared->head = 0;
-	shared->tail = 0;
 	shared->quit = 0;
 	for (int i = 0; i < MAX_ITEMS; i++) {
 		shared->data[i] = 0;
@@ -47,16 +44,16 @@ int isEmpty()
 		return 0;
 }
 
-int getItem()
+int getSolution(sem_t sUsedSpace, sem_t sFreeSpace, int *solution)
 {
-	if (isEmpty())
-		return -1;
-	
+	sem_wait(&sUsedSpace);
+
 	int value;
-	
+
 	value = shared->data[shared->head];
 	shared->head = (shared->head + 1) % MAX_ITEMS;
-	shared->validItems--;
+
+	sem_post(&sFreeSpace);
 
 	return value;
 }
@@ -95,6 +92,8 @@ int main(int argc, char *argv[])
 	initCircBuf();
 
 	while (quit == 0) {
+		int solution[MAX_ITEMS] = {-1};
+		getSolution(*sUsedSpace, *sFreeSpace, solution);
 
 	}