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Diffstat (limited to 'tools/perf/util/ui/helpline.c')
-rw-r--r--tools/perf/util/ui/helpline.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/perf/util/ui/helpline.c b/tools/perf/util/ui/helpline.c
index 8d79daa4458a..f36d2ff509ed 100644
--- a/tools/perf/util/ui/helpline.c
+++ b/tools/perf/util/ui/helpline.c
@@ -5,6 +5,7 @@
#include "../debug.h"
#include "helpline.h"
+#include "ui.h"
void ui_helpline__pop(void)
{
@@ -55,7 +56,8 @@ int ui_helpline__show_help(const char *format, va_list ap)
int ret;
static int backlog;
- ret = vsnprintf(ui_helpline__last_msg + backlog,
+ pthread_mutex_lock(&ui__lock);
+ ret = vsnprintf(ui_helpline__last_msg + backlog,
sizeof(ui_helpline__last_msg) - backlog, format, ap);
backlog += ret;
@@ -64,6 +66,7 @@ int ui_helpline__show_help(const char *format, va_list ap)
newtRefresh();
backlog = 0;
}
+ pthread_mutex_unlock(&ui__lock);
return ret;
}