Merge pull request #4426 from lioncash/lock

nvflinger: Use return value of Lock()

src/core/hle/service/nvflinger/nvflinger.cpp

@@ -68,7 +68,7 @@ NVFlinger::NVFlinger(Core::System& system) : system(system) {
     // Schedule the screen composition events
     composition_event = Core::Timing::CreateEvent(
         "ScreenComposition", [this](u64, std::chrono::nanoseconds ns_late) {
-            Lock();
+            const auto guard = Lock();
             Compose();
 
             const auto ticks = std::chrono::nanoseconds{GetNextTicks()};

src/core/hle/service/nvflinger/nvflinger.h

@@ -54,12 +54,12 @@ public:
     /// Opens the specified display and returns the ID.
     ///
     /// If an invalid display name is provided, then an empty optional is returned.
-    std::optional<u64> OpenDisplay(std::string_view name);
+    [[nodiscard]] std::optional<u64> OpenDisplay(std::string_view name);
 
     /// Creates a layer on the specified display and returns the layer ID.
     ///
     /// If an invalid display ID is specified, then an empty optional is returned.
-    std::optional<u64> CreateLayer(u64 display_id);
+    [[nodiscard]] std::optional<u64> CreateLayer(u64 display_id);
 
     /// Closes a layer on all displays for the given layer ID.
     void CloseLayer(u64 layer_id);
@@ -67,41 +67,39 @@ public:
     /// Finds the buffer queue ID of the specified layer in the specified display.
     ///
     /// If an invalid display ID or layer ID is provided, then an empty optional is returned.
-    std::optional<u32> FindBufferQueueId(u64 display_id, u64 layer_id) const;
+    [[nodiscard]] std::optional<u32> FindBufferQueueId(u64 display_id, u64 layer_id) const;
 
     /// Gets the vsync event for the specified display.
     ///
     /// If an invalid display ID is provided, then nullptr is returned.
-    std::shared_ptr<Kernel::ReadableEvent> FindVsyncEvent(u64 display_id) const;
+    [[nodiscard]] std::shared_ptr<Kernel::ReadableEvent> FindVsyncEvent(u64 display_id) const;
 
     /// Obtains a buffer queue identified by the ID.
-    BufferQueue& FindBufferQueue(u32 id);
+    [[nodiscard]] BufferQueue& FindBufferQueue(u32 id);
 
     /// Obtains a buffer queue identified by the ID.
-    const BufferQueue& FindBufferQueue(u32 id) const;
+    [[nodiscard]] const BufferQueue& FindBufferQueue(u32 id) const;
 
     /// Performs a composition request to the emulated nvidia GPU and triggers the vsync events when
     /// finished.
     void Compose();
 
-    s64 GetNextTicks() const;
+    [[nodiscard]] s64 GetNextTicks() const;
 
-    std::unique_lock<std::mutex> Lock() {
+    [[nodiscard]] std::unique_lock<std::mutex> Lock() const { return std::unique_lock{*guard}; }
-        return std::unique_lock{*guard};
-    }
 
     private :
         /// Finds the display identified by the specified ID.
-    VI::Display* FindDisplay(u64 display_id);
+        [[nodiscard]] VI::Display* FindDisplay(u64 display_id);
 
     /// Finds the display identified by the specified ID.
-    const VI::Display* FindDisplay(u64 display_id) const;
+    [[nodiscard]] const VI::Display* FindDisplay(u64 display_id) const;
 
     /// Finds the layer identified by the specified ID in the desired display.
-    VI::Layer* FindLayer(u64 display_id, u64 layer_id);
+    [[nodiscard]] VI::Layer* FindLayer(u64 display_id, u64 layer_id);
 
     /// Finds the layer identified by the specified ID in the desired display.
-    const VI::Layer* FindLayer(u64 display_id, u64 layer_id) const;
+    [[nodiscard]] const VI::Layer* FindLayer(u64 display_id, u64 layer_id) const;
 
     static void VSyncThread(NVFlinger& nv_flinger);
 

src/core/hle/service/vi/vi.cpp

@@ -511,7 +511,7 @@ private:
         LOG_DEBUG(Service_VI, "called. id=0x{:08X} transaction={:X}, flags=0x{:08X}", id,
                   static_cast<u32>(transaction), flags);
 
-        nv_flinger->Lock();
+        const auto guard = nv_flinger->Lock();
         auto& buffer_queue = nv_flinger->FindBufferQueue(id);
 
         switch (transaction) {
@@ -551,7 +551,7 @@ private:
                     [=](std::shared_ptr<Kernel::Thread> thread, Kernel::HLERequestContext& ctx,
                         Kernel::ThreadWakeupReason reason) {
                         // Repeat TransactParcel DequeueBuffer when a buffer is available
-                        nv_flinger->Lock();
+                        const auto guard = nv_flinger->Lock();
                         auto& buffer_queue = nv_flinger->FindBufferQueue(id);
                         auto result = buffer_queue.DequeueBuffer(width, height);
                         ASSERT_MSG(result != std::nullopt, "Could not dequeue buffer.");