ipc/mscom/MainThreadInvoker.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_mscom_MainThreadInvoker_h
   8 #define mozilla_mscom_MainThreadInvoker_h
   9
  10 #include <windows.h>
  11
  12 #include <utility>
  13
  14 #include "mozilla/AlreadyAddRefed.h"
  15 #include "mozilla/StaticPtr.h"
  16 #include "mozilla/TimeStamp.h"
  17 #include "nsCOMPtr.h"
  18 #include "nsThreadUtils.h"
  19
  20 class nsIRunnable;
  21
  22 namespace mozilla {
  23 namespace mscom {
  24
  25 class MainThreadInvoker {
  26  public:
  27   MainThreadInvoker();
  28
  29   bool Invoke(already_AddRefed<nsIRunnable>&& aRunnable);
  30   const TimeDuration& GetDuration() const { return mDuration; }
  31   static HANDLE GetTargetThread() { return sMainThread; }
  32
  33  private:
  34   TimeDuration mDuration;
  35
  36   static bool InitStatics();
  37   static VOID CALLBACK MainThreadAPC(ULONG_PTR aParam);
  38
  39   static HANDLE sMainThread;
  40 };
  41
  42 template <typename Class, typename... Args>
  43 inline bool InvokeOnMainThread(const char* aName, Class* aObject,
  44                                void (Class::*aMethod)(Args...),
  45                                Args&&... aArgs) {
  46   nsCOMPtr<nsIRunnable> runnable(NewNonOwningRunnableMethod<Args...>(
  47       aName, aObject, aMethod, std::forward<Args>(aArgs)...));
  48
  49   MainThreadInvoker invoker;
  50   return invoker.Invoke(runnable.forget());
  51 }
  52
  53 }  // namespace mscom
  54 }  // namespace mozilla
  55
  56 #endif  // mozilla_mscom_MainThreadInvoker_h