Merge "Check for focused window before raising 'no focused window' ANR" am: 04c8c11c9f (8b3bd252) · Commits · e / os / android_frameworks_native

services/inputflinger/dispatcher/InputDispatcher.cpp

+34 −1

Original line number	Diff line number	Diff line
		@@ -481,6 +481,33 @@ void InputDispatcher::dispatchOnce() {
		mLooper->pollOnce(timeoutMillis);
		}

		/**
		* Raise ANR if there is no focused window.
		* Before the ANR is raised, do a final state check:
		* 1. The currently focused application must be the same one we are waiting for.
		* 2. Ensure we still don't have a focused window.
		*/
		void InputDispatcher::processNoFocusedWindowAnrLocked() {
		// Check if the application that we are waiting for is still focused.
		sp<InputApplicationHandle> focusedApplication =
		getValueByKey(mFocusedApplicationHandlesByDisplay, mAwaitedApplicationDisplayId);
		if (focusedApplication == nullptr \|\|
		focusedApplication->getApplicationToken() !=
		mAwaitedFocusedApplication->getApplicationToken()) {
		// Unexpected because we should have reset the ANR timer when focused application changed
		ALOGE("Waited for a focused window, but focused application has already changed to %s",
		focusedApplication->getName().c_str());
		return; // The focused application has changed.
		}

		const sp<InputWindowHandle>& focusedWindowHandle =
		getFocusedWindowHandleLocked(mAwaitedApplicationDisplayId);
		if (focusedWindowHandle != nullptr) {
		return; // We now have a focused window. No need for ANR.
		}
		onAnrLocked(mAwaitedFocusedApplication);
		}

		/**
		* Check if any of the connections' wait queues have events that are too old.
		* If we waited for events to be ack'ed for more than the window timeout, raise an ANR.
		@@ -492,8 +519,9 @@ nsecs_t InputDispatcher::processAnrsLocked() {
		// Check if we are waiting for a focused window to appear. Raise ANR if waited too long
		if (mNoFocusedWindowTimeoutTime.has_value() && mAwaitedFocusedApplication != nullptr) {
		if (currentTime >= *mNoFocusedWindowTimeoutTime) {
		onAnrLocked(mAwaitedFocusedApplication);
		processNoFocusedWindowAnrLocked();
		mAwaitedFocusedApplication.clear();
		mNoFocusedWindowTimeoutTime = std::nullopt;
		return LONG_LONG_MIN;
		} else {
		// Keep waiting
		@@ -1477,6 +1505,7 @@ int32_t InputDispatcher::findFocusedWindowTargetsLocked(nsecs_t currentTime,
		DEFAULT_INPUT_DISPATCHING_TIMEOUT.count());
		mNoFocusedWindowTimeoutTime = currentTime + timeout;
		mAwaitedFocusedApplication = focusedApplicationHandle;
		mAwaitedApplicationDisplayId = displayId;
		ALOGW("Waiting because no window has focus but %s may eventually add a "
		"window when it finishes starting up. Will wait for %" PRId64 "ms",
		mAwaitedFocusedApplication->getName().c_str(), ns2ms(timeout));
		@@ -3567,6 +3596,10 @@ std::vector<sp<InputWindowHandle>> InputDispatcher::getWindowHandlesLocked(
		return getValueByKey(mWindowHandlesByDisplay, displayId);
		}

		sp<InputWindowHandle> InputDispatcher::getFocusedWindowHandleLocked(int displayId) const {
		return getValueByKey(mFocusedWindowHandlesByDisplay, displayId);
		}

		sp<InputWindowHandle> InputDispatcher::getWindowHandleLocked(
		const sp<IBinder>& windowHandleToken) const {
		if (windowHandleToken == nullptr) {

services/inputflinger/dispatcher/InputDispatcher.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -300,6 +300,7 @@ private:
		REQUIRES(mLock);
		sp<InputWindowHandle> getWindowHandleLocked(const sp<IBinder>& windowHandleToken) const
		REQUIRES(mLock);
		sp<InputWindowHandle> getFocusedWindowHandleLocked(int displayId) const REQUIRES(mLock);
		sp<InputChannel> getInputChannelLocked(const sp<IBinder>& windowToken) const REQUIRES(mLock);
		bool hasWindowHandleLocked(const sp<InputWindowHandle>& windowHandle) const REQUIRES(mLock);

		@@ -366,6 +367,11 @@ private:
		* Used to raise an ANR when we have no focused window.
		*/
		sp<InputApplicationHandle> mAwaitedFocusedApplication GUARDED_BY(mLock);
		/**
		* The displayId that the focused application is associated with.
		*/
		int32_t mAwaitedApplicationDisplayId GUARDED_BY(mLock);
		void processNoFocusedWindowAnrLocked() REQUIRES(mLock);

		// Optimization: AnrTracker is used to quickly find which connection is due for a timeout next.
		// AnrTracker must be kept in-sync with all responsive connection.waitQueues.

services/inputflinger/tests/InputDispatcher_test.cpp

+60 −0

Original line number	Diff line number	Diff line
		@@ -3032,4 +3032,64 @@ TEST_F(InputDispatcherMultiWindowAnr, SplitTouch_SingleWindowAnr) {
		mFocusedWindow->assertNoEvents();
		}

		/**
		* If we have no focused window, and a key comes in, we start the ANR timer.
		* The focused application should add a focused window before the timer runs out to prevent ANR.
		*
		* If the user touches another application during this time, the key should be dropped.
		* Next, if a new focused window comes in, without toggling the focused application,
		* then no ANR should occur.
		*
		* Normally, we would expect the new focused window to be accompanied by 'setFocusedApplication',
		* but in some cases the policy may not update the focused application.
		*/
		TEST_F(InputDispatcherMultiWindowAnr, FocusedWindowWithoutSetFocusedApplication_NoAnr) {
		sp<FakeApplicationHandle> focusedApplication = new FakeApplicationHandle();
		focusedApplication->setDispatchingTimeout(60ms);
		mDispatcher->setFocusedApplication(ADISPLAY_ID_DEFAULT, focusedApplication);
		// The application that owns 'mFocusedWindow' and 'mUnfocusedWindow' is not focused.
		mFocusedWindow->setFocus(false);

		mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mFocusedWindow, mUnfocusedWindow}}});
		mFocusedWindow->consumeFocusEvent(false);

		// Send a key. The ANR timer should start because there is no focused window.
		// 'focusedApplication' will get blamed if this timer completes.
		// Key will not be sent anywhere because we have no focused window. It will remain pending.
		int32_t result =
		injectKey(mDispatcher, AKEY_EVENT_ACTION_DOWN, 0 /repeatCount/, ADISPLAY_ID_DEFAULT,
		INPUT_EVENT_INJECTION_SYNC_NONE, 10ms /injectionTimeout/);
		ASSERT_EQ(INPUT_EVENT_INJECTION_SUCCEEDED, result);

		// Wait until dispatcher starts the "no focused window" timer. If we don't wait here,
		// then the injected touches won't cause the focused event to get dropped.
		// The dispatcher only checks for whether the queue should be pruned upon queueing.
		// If we inject the touch right away and the ANR timer hasn't started, the touch event would
		// simply be added to the queue without 'shouldPruneInboundQueueLocked' returning 'true'.
		// For this test, it means that the key would get delivered to the window once it becomes
		// focused.
		std::this_thread::sleep_for(10ms);

		// Touch unfocused window. This should force the pending key to get dropped.
		NotifyMotionArgs motionArgs =
		generateMotionArgs(AMOTION_EVENT_ACTION_DOWN, AINPUT_SOURCE_TOUCHSCREEN,
		ADISPLAY_ID_DEFAULT, {UNFOCUSED_WINDOW_LOCATION});
		mDispatcher->notifyMotion(&motionArgs);

		// We do not consume the motion right away, because that would require dispatcher to first
		// process (== drop) the key event, and by that time, ANR will be raised.
		// Set the focused window first.
		mFocusedWindow->setFocus(true);
		mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mFocusedWindow, mUnfocusedWindow}}});
		mFocusedWindow->consumeFocusEvent(true);
		// We do not call "setFocusedApplication" here, even though the newly focused window belongs
		// to another application. This could be a bug / behaviour in the policy.

		mUnfocusedWindow->consumeMotionDown();

		ASSERT_TRUE(mDispatcher->waitForIdle());
		// Should not ANR because we actually have a focused window. It was just added too slowly.
		ASSERT_NO_FATAL_FAILURE(mFakePolicy->assertNotifyAnrWasNotCalled());
		}

		} // namespace android::inputdispatcher