3 files changed, 19 insertions, 0 deletions
diff --git a/libs/renderengine/include/renderengine/RenderEngine.h b/libs/renderengine/include/renderengine/RenderEngine.h
index b9cc6485e5..d646756fc4 100644
--- a/libs/renderengine/include/renderengine/RenderEngine.h
+++ b/libs/renderengine/include/renderengine/RenderEngine.h
@@ -189,6 +189,10 @@ public:
     static void validateInputBufferUsage(const sp<GraphicBuffer>&);
     static void validateOutputBufferUsage(const sp<GraphicBuffer>&);
 
+    // Allows flinger to get the render engine thread id for power management with ADPF
+    // Returns the tid of the renderengine thread if it's threaded, and std::nullopt otherwise
+    virtual std::optional<pid_t> getRenderEngineTid() const { return std::nullopt; }
+
 protected:
     RenderEngine() : RenderEngine(RenderEngineType::GLES) {}
 
diff --git a/libs/renderengine/threaded/RenderEngineThreaded.cpp b/libs/renderengine/threaded/RenderEngineThreaded.cpp
index 08fc81468c..a7176d3279 100644
--- a/libs/renderengine/threaded/RenderEngineThreaded.cpp
+++ b/libs/renderengine/threaded/RenderEngineThreaded.cpp
@@ -389,6 +389,20 @@ void RenderEngineThreaded::onActiveDisplaySizeChanged(ui::Size size) {
     mCondition.notify_one();
 }
 
+std::optional<pid_t> RenderEngineThreaded::getRenderEngineTid() const {
+    std::promise<pid_t> tidPromise;
+    std::future<pid_t> tidFuture = tidPromise.get_future();
+    {
+        std::lock_guard lock(mThreadMutex);
+        mFunctionCalls.push([&tidPromise](renderengine::RenderEngine& instance) {
+            tidPromise.set_value(gettid());
+        });
+    }
+
+    mCondition.notify_one();
+    return std::make_optional(tidFuture.get());
+}
+
 } // namespace threaded
 } // namespace renderengine
 } // namespace android
diff --git a/libs/renderengine/threaded/RenderEngineThreaded.h b/libs/renderengine/threaded/RenderEngineThreaded.h
index 0159cfaece..1ba72ddf81 100644
--- a/libs/renderengine/threaded/RenderEngineThreaded.h
+++ b/libs/renderengine/threaded/RenderEngineThreaded.h
@@ -66,6 +66,7 @@ public:
     int getContextPriority() override;
     bool supportsBackgroundBlur() override;
     void onActiveDisplaySizeChanged(ui::Size size) override;
+    std::optional<pid_t> getRenderEngineTid() const override;
 
 protected:
     void mapExternalTextureBuffer(const sp<GraphicBuffer>& buffer, bool isRenderable) override;