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Subject[PATCH 1/8] perf ui/tui: Protect windows by ui__lock
Date
From: Namhyung Kim <namhyung.kim@lge.com>

Sometimes perf top TUI breaks display with concurrent help/input
window and pr_* messages since they're not protected by ui__lock.
You can check it by pressing (and not releasing) 'h' key on a
"perf top -vvv" TUI session.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/ui/tui/util.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/tools/perf/ui/tui/util.c b/tools/perf/ui/tui/util.c
index 092902e30cee..bf890f72fe80 100644
--- a/tools/perf/ui/tui/util.c
+++ b/tools/perf/ui/tui/util.c
@@ -92,6 +92,8 @@ int ui_browser__input_window(const char *title, const char *text, char *input,
t = sep + 1;
}

+ pthread_mutex_lock(&ui__lock);
+
max_len += 2;
nr_lines += 8;
y = SLtt_Screen_Rows / 2 - nr_lines / 2;
@@ -120,13 +122,19 @@ int ui_browser__input_window(const char *title, const char *text, char *input,
SLsmg_write_nstring((char *)exit_msg, max_len);
SLsmg_refresh();

+ pthread_mutex_unlock(&ui__lock);
+
x += 2;
len = 0;
key = ui__getch(delay_secs);
while (key != K_TIMER && key != K_ENTER && key != K_ESC) {
+ pthread_mutex_lock(&ui__lock);
+
if (key == K_BKSPC) {
- if (len == 0)
+ if (len == 0) {
+ pthread_mutex_unlock(&ui__lock);
goto next_key;
+ }
SLsmg_gotorc(y, x + --len);
SLsmg_write_char(' ');
} else {
@@ -136,6 +144,8 @@ int ui_browser__input_window(const char *title, const char *text, char *input,
}
SLsmg_refresh();

+ pthread_mutex_unlock(&ui__lock);
+
/* XXX more graceful overflow handling needed */
if (len == sizeof(buf) - 1) {
ui_helpline__push("maximum size of symbol name reached!");
@@ -174,6 +184,8 @@ int ui__question_window(const char *title, const char *text,
t = sep + 1;
}

+ pthread_mutex_lock(&ui__lock);
+
max_len += 2;
nr_lines += 4;
y = SLtt_Screen_Rows / 2 - nr_lines / 2,
@@ -195,6 +207,9 @@ int ui__question_window(const char *title, const char *text,
SLsmg_gotorc(y + nr_lines - 1, x);
SLsmg_write_nstring((char *)exit_msg, max_len);
SLsmg_refresh();
+
+ pthread_mutex_unlock(&ui__lock);
+
return ui__getch(delay_secs);
}

@@ -215,9 +230,7 @@ static int __ui__warning(const char *title, const char *format, va_list args)
if (vasprintf(&s, format, args) > 0) {
int key;

- pthread_mutex_lock(&ui__lock);
key = ui__question_window(title, s, "Press any key...", 0);
- pthread_mutex_unlock(&ui__lock);
free(s);
return key;
}
--
1.7.11.7


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