From 0408363863bc6c5913f4d84fa333d0ddb636b20b Mon Sep 17 00:00:00 2001
From: xiaowei guan <xiaowei.guan@samsung.com>
Date: Tue, 22 Aug 2023 20:37:05 +0800
Subject: [PATCH] Add lock for thread safe

---
 flutter/shell/platform/tizen/flutter_tizen_engine.cc | 2 ++
 flutter/shell/platform/tizen/flutter_tizen_engine.h  | 1 +
 2 files changed, 3 insertions(+)

diff --git a/flutter/shell/platform/tizen/flutter_tizen_engine.cc b/flutter/shell/platform/tizen/flutter_tizen_engine.cc
index 539224f..b106177 100644
--- a/flutter/shell/platform/tizen/flutter_tizen_engine.cc
+++ b/flutter/shell/platform/tizen/flutter_tizen_engine.cc
@@ -216,6 +216,7 @@ bool FlutterTizenEngine::RunEngine() {
     vsync_waiter_ = std::make_unique<TizenVsyncWaiter>(this);
     args.vsync_callback = [](void* user_data, intptr_t baton) -> void {
       auto* engine = static_cast<FlutterTizenEngine*>(user_data);
+      std::lock_guard<std::mutex> lock(engine->vsync_mutex_);
       if (engine->vsync_waiter_) {
         engine->vsync_waiter_->AsyncWaitForVsync(baton);
       }
@@ -268,6 +269,7 @@ bool FlutterTizenEngine::StopEngine() {
       callback(registrar);
     }
 #ifndef WEARABLE_PROFILE
+    std::lock_guard<std::mutex> lock(vsync_mutex_);
     if (vsync_waiter_) {
       vsync_waiter_.reset();
     }
diff --git a/flutter/shell/platform/tizen/flutter_tizen_engine.h b/flutter/shell/platform/tizen/flutter_tizen_engine.h
index 6108d63..d93523f 100644
--- a/flutter/shell/platform/tizen/flutter_tizen_engine.h
+++ b/flutter/shell/platform/tizen/flutter_tizen_engine.h
@@ -272,6 +272,7 @@ class FlutterTizenEngine {
   std::unique_ptr<TizenRenderer> renderer_;
 
 #ifndef WEARABLE_PROFILE
+  std::mutex vsync_mutex_;
   // The vsync waiter for the embedder.
   std::unique_ptr<TizenVsyncWaiter> vsync_waiter_;
 #endif