internal/ui: call setRunning(true) at a more appropriate timing

internal/ui/run.go

@@ -55,12 +55,6 @@ func (u *UserInterface) runMultiThread(game Game, options *RunOptions) error {
 	wg.Go(func() error {
 		defer cancel()
 
-		// Set the running state true after the main thread is set, and before initOnMainThread is called (#2742).
-		// TODO: As the existence of the main thread is the same as the value of `running`, this is redundant.
-		// Make `mainThread` atomic and remove `running` if possible.
-		u.setRunning(true)
-		defer u.setRunning(false)
-
 		var err error
 		u.mainThread.Call(func() {
 			if err1 := u.initOnMainThread(options); err1 != nil {
@@ -71,6 +65,9 @@ func (u *UserInterface) runMultiThread(game Game, options *RunOptions) error {
 			return err
 		}
 
+		// setRunning(true) should be called in initOnMainThread for each platform.
+		defer u.setRunning(false)
+
 		return u.loopGame()
 	})
 

internal/ui/ui_glfw.go

@@ -821,6 +821,8 @@ func (u *UserInterface) createWindow() error {
 		return err
 	}
 	u.window = window
+	// Set the running state true just a window is set (#2742).
+	u.setRunning(true)
 
 	// The position must be set before the size is set (#1982).
 	// setWindowSizeInDIP refers the current monitor's device scale.

internal/ui/ui_js.go

@@ -749,6 +749,8 @@ func (u *UserInterface) shouldFocusFirst(options *RunOptions) bool {
 }
 
 func (u *UserInterface) initOnMainThread(options *RunOptions) error {
+	u.setRunning(true)
+
 	if u.shouldFocusFirst(options) {
 		canvas.Call("focus")
 	}

internal/ui/ui_nintendosdk.go

@@ -73,6 +73,8 @@ func (u *UserInterface) init() error {
 }
 
 func (u *UserInterface) initOnMainThread(options *RunOptions) error {
+	u.setRunning(true)
+
 	n := C.ebitengine_Initialize()
 	g, lib, err := newGraphicsDriver(&graphicsDriverCreatorImpl{
 		nativeWindow: n,

internal/ui/ui_playstation5.go

@@ -69,6 +69,8 @@ func (u *UserInterface) init() error {
 }
 
 func (u *UserInterface) initOnMainThread(options *RunOptions) error {
+	u.setRunning(true)
+
 	g, lib, err := newGraphicsDriver(&graphicsDriverCreatorImpl{}, options.GraphicsLibrary)
 	if err != nil {
 		return err