MPI_Comm MPI_COMM_WORLD = MPI_COMM_NULL;
+MPI_Errhandler* MPI_ERRORS_RETURN = NULL;
+MPI_Errhandler* MPI_ERRORS_ARE_FATAL = NULL;
+MPI_Errhandler* MPI_ERRHANDLER_NULL = NULL;
+
#define MAILBOX_NAME_MAXLEN (5 + sizeof(int) * 2 + 1)
static char* get_mailbox_name(char* str, int index) {