flowtop: Redraw screen in 1s if no key was pressed

Seems like screen is updating too frequently which
may block some terminals, so lets do it once in 1s
but only if no key was pressed.

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 16 insertions, 2 deletions

diff --git a/flowtop.c b/flowtop.c
index 2791a74..d4a8ad9 100644
--- a/flowtop.c
+++ b/flowtop.c
@@ -1161,6 +1161,8 @@ static void presenter_screen_update(WINDOW *screen, struct flow_list *fl,
 
 static void presenter(void)
 {
+	int time_sleep_us = 200000;
+	int time_passed_us = 0;
 	int skip_lines = 0;
 	WINDOW *screen;
 
@@ -1170,6 +1172,8 @@ static void presenter(void)
 
 	rcu_register_thread();
 	while (!sigint) {
+		bool do_redraw = true;
+
 		switch (getch()) {
 		case 'q':
 			sigint = 1;
@@ -1190,11 +1194,21 @@ static void presenter(void)
 			break;
 		default:
 			fflush(stdin);
+			do_redraw = false;
 			break;
 		}
 
-		presenter_screen_update(screen, &flow_list, skip_lines);
-		usleep(200000);
+		if (!do_redraw)
+			do_redraw = time_passed_us >= 1 * USEC_PER_SEC;
+
+		if (do_redraw) {
+			presenter_screen_update(screen, &flow_list, skip_lines);
+			time_passed_us = 0;
+		} else {
+			time_passed_us += time_sleep_us;
+		}
+
+		usleep(time_sleep_us);
 	}
 	rcu_unregister_thread();