/* -*- 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_Ptr_h #define mozilla_mscom_Ptr_h #include "mozilla/Assertions.h" #include "mozilla/DebugOnly.h" #include "mozilla/mscom/EnsureMTA.h" #include "mozilla/UniquePtr.h" #include "nsError.h" #include "nsThreadUtils.h" #include "nsXULAppAPI.h" /** * The glue code in mozilla::mscom often needs to pass around interface pointers * belonging to a different apartment from the current one. We must not touch * the reference counts of those objects on the wrong apartment. By using these * UniquePtr specializations, we may ensure that the reference counts are always * handled correctly. */ namespace mozilla { namespace mscom { namespace detail { template <typename T> struct MainThreadRelease { void operator()(T* aPtr) { if (!aPtr) { return; } if (NS_IsMainThread()) { aPtr->Release(); return; } DebugOnly<nsresult> rv = NS_DispatchToMainThread(NewNonOwningRunnableMethod(aPtr, &T::Release)); MOZ_ASSERT(NS_SUCCEEDED(rv)); } }; template <typename T> struct MTARelease { void operator()(T* aPtr) { if (!aPtr) { return; } EnsureMTA([&]() -> void { aPtr->Release(); }); } }; template <typename T> struct MTAReleaseInChildProcess { void operator()(T* aPtr) { if (!aPtr) { return; } if (XRE_IsParentProcess()) { MOZ_ASSERT(NS_IsMainThread()); aPtr->Release(); return; } EnsureMTA([&]() -> void { aPtr->Release(); }); } }; struct InterceptorTargetDeleter { void operator()(IUnknown* aPtr) { // We intentionally do not touch the refcounts of interceptor targets! } }; } // namespace detail template <typename T> using STAUniquePtr = mozilla::UniquePtr<T, detail::MainThreadRelease<T>>; template <typename T> using MTAUniquePtr = mozilla::UniquePtr<T, detail::MTARelease<T>>; template <typename T> using ProxyUniquePtr = mozilla::UniquePtr<T, detail::MTAReleaseInChildProcess<T>>; using InterceptorTargetPtr = mozilla::UniquePtr<IUnknown, detail::InterceptorTargetDeleter>; } // namespace mscom } // namespace mozilla #endif // mozilla_mscom_Ptr_h