Bug 1669214 - Part 4: Add code to forward runnables from EventQueue::PutEvent to the TaskController. r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D92453

xpcom/threads/EventQueue.cpp

@@ -7,7 +7,9 @@
 #include "mozilla/EventQueue.h"
 
 #include "GeckoProfiler.h"
+#include "InputTaskManager.h"
 #include "nsIRunnable.h"
+#include "TaskController.h"
 
 using namespace mozilla;
 using namespace mozilla::detail;
@@ -20,6 +22,29 @@ template <size_t ItemsPerPage>
 void EventQueueInternal<ItemsPerPage>::PutEvent(
     already_AddRefed<nsIRunnable>&& aEvent, EventQueuePriority aPriority,
     const MutexAutoLock& aProofOfLock, mozilla::TimeDuration* aDelay) {
+  nsCOMPtr<nsIRunnable> event(aEvent);
+
+  if (mForwardToTC) {
+    TaskController* tc = TaskController::Get();
+
+    TaskManager* manager = nullptr;
+    if (aPriority == EventQueuePriority::InputHigh) {
+      if (InputTaskManager::Get()->State() ==
+          InputTaskManager::STATE_DISABLED) {
+        aPriority = EventQueuePriority::Normal;
+      } else {
+        manager = InputTaskManager::Get();
+      }
+    } else if (aPriority == EventQueuePriority::DeferredTimers ||
+               aPriority == EventQueuePriority::Idle) {
+      manager = TaskController::Get()->GetIdleTaskManager();
+    }
+
+    tc->DispatchRunnable(event.forget(), static_cast<uint32_t>(aPriority),
+                         manager);
+    return;
+  }
+
 #ifdef MOZ_GECKO_PROFILER
   // Sigh, this doesn't check if this thread is being profiled
   if (profiler_is_active()) {
@@ -31,7 +56,6 @@ void EventQueueInternal<ItemsPerPage>::PutEvent(
   }
 #endif
 
-  nsCOMPtr<nsIRunnable> event(aEvent);
   mQueue.Push(std::move(event));
 }
 

xpcom/threads/EventQueue.h

@@ -24,7 +24,7 @@ class EventQueueInternal : public AbstractEventQueue {
  public:
   static const bool SupportsPrioritization = false;
 
-  EventQueueInternal() {}
+  explicit EventQueueInternal(bool aForwardToTC) : mForwardToTC(aForwardToTC) {}
   explicit EventQueueInternal(EventQueuePriority aPriority);
 
   void PutEvent(already_AddRefed<nsIRunnable>&& aEvent,
@@ -91,13 +91,17 @@ class EventQueueInternal : public AbstractEventQueue {
   mozilla::Queue<mozilla::TimeStamp, ItemsPerPage> mDispatchTimes;
   TimeDuration mLastEventDelay;
 #endif
+  // This indicates PutEvent forwards runnables to the TaskController. This
+  // should be true for the top level event queue on the main thread.
+  bool mForwardToTC;
 };
 
 }  // namespace detail
 
 class EventQueue final : public mozilla::detail::EventQueueInternal<16> {
  public:
-  EventQueue() : mozilla::detail::EventQueueInternal<16>() {}
+  explicit EventQueue(bool aForwardToTC = false)
+      : mozilla::detail::EventQueueInternal<16>(aForwardToTC) {}
   explicit EventQueue(EventQueuePriority aPriority)
       : mozilla::detail::EventQueueInternal<16>(aPriority){};
 };
@@ -106,7 +110,8 @@ template <size_t ItemsPerPage = 16>
 class EventQueueSized final
     : public mozilla::detail::EventQueueInternal<ItemsPerPage> {
  public:
-  EventQueueSized() : mozilla::detail::EventQueueInternal<ItemsPerPage>() {}
+  explicit EventQueueSized(bool aForwardToTC = false)
+      : mozilla::detail::EventQueueInternal<ItemsPerPage>(aForwardToTC) {}
   explicit EventQueueSized(EventQueuePriority aPriority)
       : mozilla::detail::EventQueueInternal<ItemsPerPage>(aPriority){};
 };

xpcom/threads/InputTaskManager.cpp

@@ -72,14 +72,6 @@ void InputTaskManager::DidRunTask() {
 }
 
 // static
-InputTaskManager* InputTaskManager::Get() {
-  MOZ_ASSERT(NS_IsMainThread());
-  if (gInputTaskManager) {
-    return gInputTaskManager.get();
-  }
-
-  gInputTaskManager = new InputTaskManager();
-  return gInputTaskManager.get();
-}
+void InputTaskManager::Init() { gInputTaskManager = new InputTaskManager(); }
 
 }  // namespace mozilla

xpcom/threads/InputTaskManager.h

@@ -40,8 +40,9 @@ class InputTaskManager : public TaskManager {
     mInputHandlingStartTime = aStartTime;
   }
 
-  static InputTaskManager* Get();
+  static InputTaskManager* Get() { return gInputTaskManager.get(); }
   static void Cleanup() { gInputTaskManager = nullptr; }
+  static void Init();
 
  private:
   InputTaskManager() : mInputQueueState(STATE_DISABLED) {}

xpcom/threads/TaskController.cpp

@@ -79,6 +79,7 @@ bool TaskController::Initialize() {
 }
 
 bool TaskController::InitializeInternal() {
+  InputTaskManager::Init();
   mMTProcessingRunnable = NS_NewRunnableFunction(
       "TaskController::ExecutePendingMTTasks()",
       []() { TaskController::Get()->ProcessPendingMTTask(); });