+#include <stdio.h>
+#include <mpi.h>
+#include <simgrid/modelchecker.h>
+
+int x = 0;
+int y = 0;
+
+int main(int argc, char **argv) {
+
+ int recv_x, recv_y, size, rank;
+ MPI_Status status;
+
+ MPI_Init(&argc, &argv);
+
+ MPI_Comm_size(MPI_COMM_WORLD, &size); /* Get nr of tasks */
+ MPI_Comm_rank(MPI_COMM_WORLD, &rank); /* Get id of this process */
+
+ MC_ignore(&(status.count), sizeof(status.count));
+
+ if (rank == 0) {
+ while (x<5) {
+ MPI_Recv(&recv_x, 1, MPI_INT, MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
+ MPI_Recv(&recv_y, 1, MPI_INT, MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
+ }
+ } else {
+ while (x<5) {
+ int old_x = x;
+ x = old_x - y;
+ MPI_Send(&x, 1, MPI_INT, 0, 42, MPI_COMM_WORLD);
+ y = old_x + y;
+ MPI_Send(&y, 1, MPI_INT, 0, 42, MPI_COMM_WORLD);
+ }
+ }
+
+ MPI_Finalize();
+
+ return 0;
+}