struct progress;
void display_throughput(struct progress *progress, uint64_t total);
-int display_progress(struct progress *progress, uint64_t n);
+void display_progress(struct progress *progress, uint64_t n);
struct progress *start_progress(const char *title, uint64_t total);
struct progress *start_sparse_progress(const char *title, uint64_t total);
struct progress *start_delayed_progress(const char *title, uint64_t total);