1 files changed, 56 insertions, 0 deletions
diff --git a/ipc/mscom/MainThreadInvoker.h b/ipc/mscom/MainThreadInvoker.h
new file mode 100644
index 0000000000..8b56f9bed0
--- /dev/null
+++ b/ipc/mscom/MainThreadInvoker.h
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_mscom_MainThreadInvoker_h
+#define mozilla_mscom_MainThreadInvoker_h
+
+#include <windows.h>
+
+#include <utility>
+
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/TimeStamp.h"
+#include "nsCOMPtr.h"
+#include "nsThreadUtils.h"
+
+class nsIRunnable;
+
+namespace mozilla {
+namespace mscom {
+
+class MainThreadInvoker {
+ public:
+  MainThreadInvoker();
+
+  bool Invoke(already_AddRefed<nsIRunnable>&& aRunnable);
+  const TimeDuration& GetDuration() const { return mDuration; }
+  static HANDLE GetTargetThread() { return sMainThread; }
+
+ private:
+  TimeDuration mDuration;
+
+  static bool InitStatics();
+  static VOID CALLBACK MainThreadAPC(ULONG_PTR aParam);
+
+  static HANDLE sMainThread;
+};
+
+template <typename Class, typename... Args>
+inline bool InvokeOnMainThread(const char* aName, Class* aObject,
+                               void (Class::*aMethod)(Args...),
+                               Args&&... aArgs) {
+  nsCOMPtr<nsIRunnable> runnable(NewNonOwningRunnableMethod<Args...>(
+      aName, aObject, aMethod, std::forward<Args>(aArgs)...));
+
+  MainThreadInvoker invoker;
+  return invoker.Invoke(runnable.forget());
+}
+
+}  // namespace mscom
+}  // namespace mozilla
+
+#endif  // mozilla_mscom_MainThreadInvoker_h