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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /ipc/mscom/Ptr.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'ipc/mscom/Ptr.h')
-rw-r--r--ipc/mscom/Ptr.h111
1 files changed, 111 insertions, 0 deletions
diff --git a/ipc/mscom/Ptr.h b/ipc/mscom/Ptr.h
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+/* -*- 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
+