111 lines
2.4 KiB
C++
111 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_mscom_Ptr_h
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#define mozilla_mscom_Ptr_h
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#include "mozilla/Assertions.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/mscom/EnsureMTA.h"
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#include "mozilla/UniquePtr.h"
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#include "nsError.h"
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#include "nsThreadUtils.h"
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#include "nsXULAppAPI.h"
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/**
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* The glue code in mozilla::mscom often needs to pass around interface pointers
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* belonging to a different apartment from the current one. We must not touch
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* the reference counts of those objects on the wrong apartment. By using these
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* UniquePtr specializations, we may ensure that the reference counts are always
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* handled correctly.
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*/
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namespace mozilla {
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namespace mscom {
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namespace detail {
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template <typename T>
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struct MainThreadRelease
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{
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void operator()(T* aPtr)
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{
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if (!aPtr) {
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return;
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}
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if (NS_IsMainThread()) {
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aPtr->Release();
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return;
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}
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DebugOnly<nsresult> rv =
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NS_DispatchToMainThread(NewNonOwningRunnableMethod(aPtr,
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&T::Release));
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MOZ_ASSERT(NS_SUCCEEDED(rv));
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}
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};
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template <typename T>
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struct MTARelease
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{
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void operator()(T* aPtr)
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{
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if (!aPtr) {
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return;
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}
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EnsureMTA([&]() -> void
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{
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aPtr->Release();
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});
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}
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};
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template <typename T>
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struct MTAReleaseInChildProcess
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{
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void operator()(T* aPtr)
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{
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if (!aPtr) {
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return;
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}
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if (XRE_IsParentProcess()) {
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MOZ_ASSERT(NS_IsMainThread());
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aPtr->Release();
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return;
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}
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EnsureMTA([&]() -> void
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{
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aPtr->Release();
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});
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}
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};
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struct InterceptorTargetDeleter
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{
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void operator()(IUnknown* aPtr)
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{
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// We intentionally do not touch the refcounts of interceptor targets!
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}
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};
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} // namespace detail
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template <typename T>
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using STAUniquePtr = mozilla::UniquePtr<T, detail::MainThreadRelease<T>>;
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template <typename T>
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using MTAUniquePtr = mozilla::UniquePtr<T, detail::MTARelease<T>>;
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template <typename T>
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using ProxyUniquePtr = mozilla::UniquePtr<T, detail::MTAReleaseInChildProcess<T>>;
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using InterceptorTargetPtr =
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mozilla::UniquePtr<IUnknown, detail::InterceptorTargetDeleter>;
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} // namespace mscom
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} // namespace mozilla
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#endif // mozilla_mscom_Ptr_h
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