PointerChoreographer: Do not call the policy with the lock held
Since there is already precedent for InputReader to interact with the
policy with its lock held, we must not do the same from other
components, since it can result in deadlocks.
In this CL, we ensure that the PointerChoreographer does not interact
with the policy while holding its lock. The exception is the use of the
factory method for PointerController, which is only part of the policy
to work around dependency issues with graphics libraries.
Bug: 327717240
Test: atest inputflinger_tests
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:5a51a2280743605a51e2f9d632077e9297276520)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:ea5ddd132cfe5818f4e05d70a0f8e006fd6e2da6)
Merged-In: Ib81d72898a212275d95f9d84d89a16e7172e108e
Change-Id: Ib81d72898a212275d95f9d84d89a16e7172e108e
diff --git a/services/inputflinger/PointerChoreographer.cpp b/services/inputflinger/PointerChoreographer.cpp
index 3e7c1c7..9db3574 100644
--- a/services/inputflinger/PointerChoreographer.cpp
+++ b/services/inputflinger/PointerChoreographer.cpp
@@ -26,6 +26,7 @@
namespace android {
namespace {
+
bool isFromMouse(const NotifyMotionArgs& args) {
return isFromSource(args.source, AINPUT_SOURCE_MOUSE) &&
args.pointerProperties[0].toolType == ToolType::MOUSE;
@@ -44,13 +45,23 @@
bool isStylusHoverEvent(const NotifyMotionArgs& args) {
return isStylusEvent(args.source, args.pointerProperties) && isHoverAction(args.action);
}
+
+inline void notifyPointerDisplayChange(std::optional<std::tuple<int32_t, FloatPoint>> change,
+ PointerChoreographerPolicyInterface& policy) {
+ if (!change) {
+ return;
+ }
+ const auto& [displayId, cursorPosition] = *change;
+ policy.notifyPointerDisplayIdChanged(displayId, cursorPosition);
+}
+
} // namespace
// --- PointerChoreographer ---
PointerChoreographer::PointerChoreographer(InputListenerInterface& listener,
PointerChoreographerPolicyInterface& policy)
- : mTouchControllerConstructor([this]() REQUIRES(mLock) {
+ : mTouchControllerConstructor([this]() {
return mPolicy.createPointerController(
PointerControllerInterface::ControllerType::TOUCH);
}),
@@ -62,10 +73,16 @@
mStylusPointerIconEnabled(false) {}
void PointerChoreographer::notifyInputDevicesChanged(const NotifyInputDevicesChangedArgs& args) {
- std::scoped_lock _l(mLock);
+ PointerDisplayChange pointerDisplayChange;
- mInputDeviceInfos = args.inputDeviceInfos;
- updatePointerControllersLocked();
+ { // acquire lock
+ std::scoped_lock _l(mLock);
+
+ mInputDeviceInfos = args.inputDeviceInfos;
+ pointerDisplayChange = updatePointerControllersLocked();
+ } // release lock
+
+ notifyPointerDisplayChange(pointerDisplayChange, mPolicy);
mNextListener.notify(args);
}
@@ -329,7 +346,7 @@
return mDisplaysWithPointersHidden.find(displayId) == mDisplaysWithPointersHidden.end();
}
-void PointerChoreographer::updatePointerControllersLocked() {
+PointerChoreographer::PointerDisplayChange PointerChoreographer::updatePointerControllersLocked() {
std::set<int32_t /*displayId*/> mouseDisplaysToKeep;
std::set<DeviceId> touchDevicesToKeep;
std::set<DeviceId> stylusDevicesToKeep;
@@ -378,11 +395,12 @@
mInputDeviceInfos.end();
});
- // Notify the policy if there's a change on the pointer display ID.
- notifyPointerDisplayIdChangedLocked();
+ // Check if we need to notify the policy if there's a change on the pointer display ID.
+ return calculatePointerDisplayChangeToNotify();
}
-void PointerChoreographer::notifyPointerDisplayIdChangedLocked() {
+PointerChoreographer::PointerDisplayChange
+PointerChoreographer::calculatePointerDisplayChangeToNotify() {
int32_t displayIdToNotify = ADISPLAY_ID_NONE;
FloatPoint cursorPosition = {0, 0};
if (const auto it = mMousePointersByDisplay.find(mDefaultMouseDisplayId);
@@ -394,38 +412,49 @@
displayIdToNotify = pointerController->getDisplayId();
cursorPosition = pointerController->getPosition();
}
-
if (mNotifiedPointerDisplayId == displayIdToNotify) {
- return;
+ return {};
}
- mPolicy.notifyPointerDisplayIdChanged(displayIdToNotify, cursorPosition);
mNotifiedPointerDisplayId = displayIdToNotify;
+ return {{displayIdToNotify, cursorPosition}};
}
void PointerChoreographer::setDefaultMouseDisplayId(int32_t displayId) {
- std::scoped_lock _l(mLock);
+ PointerDisplayChange pointerDisplayChange;
- mDefaultMouseDisplayId = displayId;
- updatePointerControllersLocked();
+ { // acquire lock
+ std::scoped_lock _l(mLock);
+
+ mDefaultMouseDisplayId = displayId;
+ pointerDisplayChange = updatePointerControllersLocked();
+ } // release lock
+
+ notifyPointerDisplayChange(pointerDisplayChange, mPolicy);
}
void PointerChoreographer::setDisplayViewports(const std::vector<DisplayViewport>& viewports) {
- std::scoped_lock _l(mLock);
- for (const auto& viewport : viewports) {
- const int32_t displayId = viewport.displayId;
- if (const auto it = mMousePointersByDisplay.find(displayId);
- it != mMousePointersByDisplay.end()) {
- it->second->setDisplayViewport(viewport);
- }
- for (const auto& [deviceId, stylusPointerController] : mStylusPointersByDevice) {
- const InputDeviceInfo* info = findInputDeviceLocked(deviceId);
- if (info && info->getAssociatedDisplayId() == displayId) {
- stylusPointerController->setDisplayViewport(viewport);
+ PointerDisplayChange pointerDisplayChange;
+
+ { // acquire lock
+ std::scoped_lock _l(mLock);
+ for (const auto& viewport : viewports) {
+ const int32_t displayId = viewport.displayId;
+ if (const auto it = mMousePointersByDisplay.find(displayId);
+ it != mMousePointersByDisplay.end()) {
+ it->second->setDisplayViewport(viewport);
+ }
+ for (const auto& [deviceId, stylusPointerController] : mStylusPointersByDevice) {
+ const InputDeviceInfo* info = findInputDeviceLocked(deviceId);
+ if (info && info->getAssociatedDisplayId() == displayId) {
+ stylusPointerController->setDisplayViewport(viewport);
+ }
}
}
- }
- mViewports = viewports;
- notifyPointerDisplayIdChangedLocked();
+ mViewports = viewports;
+ pointerDisplayChange = calculatePointerDisplayChangeToNotify();
+ } // release lock
+
+ notifyPointerDisplayChange(pointerDisplayChange, mPolicy);
}
std::optional<DisplayViewport> PointerChoreographer::getViewportForPointerDevice(
@@ -449,21 +478,33 @@
}
void PointerChoreographer::setShowTouchesEnabled(bool enabled) {
- std::scoped_lock _l(mLock);
- if (mShowTouchesEnabled == enabled) {
- return;
- }
- mShowTouchesEnabled = enabled;
- updatePointerControllersLocked();
+ PointerDisplayChange pointerDisplayChange;
+
+ { // acquire lock
+ std::scoped_lock _l(mLock);
+ if (mShowTouchesEnabled == enabled) {
+ return;
+ }
+ mShowTouchesEnabled = enabled;
+ pointerDisplayChange = updatePointerControllersLocked();
+ } // release lock
+
+ notifyPointerDisplayChange(pointerDisplayChange, mPolicy);
}
void PointerChoreographer::setStylusPointerIconEnabled(bool enabled) {
- std::scoped_lock _l(mLock);
- if (mStylusPointerIconEnabled == enabled) {
- return;
- }
- mStylusPointerIconEnabled = enabled;
- updatePointerControllersLocked();
+ PointerDisplayChange pointerDisplayChange;
+
+ { // acquire lock
+ std::scoped_lock _l(mLock);
+ if (mStylusPointerIconEnabled == enabled) {
+ return;
+ }
+ mStylusPointerIconEnabled = enabled;
+ pointerDisplayChange = updatePointerControllersLocked();
+ } // release lock
+
+ notifyPointerDisplayChange(pointerDisplayChange, mPolicy);
}
bool PointerChoreographer::setPointerIcon(