1 files changed, 35 insertions, 0 deletions
diff --git a/services/surfaceflinger/MainThreadGuard.h b/services/surfaceflinger/MainThreadGuard.h
new file mode 100644
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+++ b/services/surfaceflinger/MainThreadGuard.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <utils/Mutex.h>
+
+namespace android {
+namespace {
+
+// Helps to ensure that some functions runs on SF's main thread by using the
+// clang thread safety annotations.
+class CAPABILITY("mutex") MainThreadGuard {
+} SF_MAIN_THREAD;
+
+struct SCOPED_CAPABILITY MainThreadScopedGuard {
+public:
+    explicit MainThreadScopedGuard(MainThreadGuard& mutex) ACQUIRE(mutex) {}
+    ~MainThreadScopedGuard() RELEASE() {}
+};
+} // namespace
+} // namespace android