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f001853338
This introduces a new type to ContentParent which acts as a weak handle to the actor and is safe to hold and manipulate from any thread. This replaces accesses of the `ContentParent` type from the background thread, as they were error-prone due to ContentParent not being threadsafe-refcounted. The bulk of this patch is piping the new type through to the places it is required, and removing now-unecessary extra complexity. Differential Revision: https://phabricator.services.mozilla.com/D162346
114 lines
3.3 KiB
C++
114 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_ipc_backgroundparent_h__
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#define mozilla_ipc_backgroundparent_h__
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#include "base/process.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/dom/ContentParent.h"
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#include "nsStringFwd.h"
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#include "nsTArrayForwardDeclare.h"
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#ifdef DEBUG
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# include "nsXULAppAPI.h"
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#endif
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template <class>
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struct already_AddRefed;
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namespace mozilla {
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namespace net {
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class SocketProcessBridgeParent;
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class SocketProcessParent;
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} // namespace net
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namespace dom {
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class BlobImpl;
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class ContentParent;
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} // namespace dom
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namespace ipc {
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class BackgroundStarterParent;
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class PBackgroundParent;
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class PBackgroundStarterParent;
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template <class PFooSide>
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class Endpoint;
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// This class is not designed for public consumption beyond the few static
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// member functions.
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class BackgroundParent final {
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friend class mozilla::ipc::BackgroundStarterParent;
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friend class mozilla::dom::ContentParent;
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friend class mozilla::net::SocketProcessBridgeParent;
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friend class mozilla::net::SocketProcessParent;
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using ProcessId = base::ProcessId;
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using BlobImpl = mozilla::dom::BlobImpl;
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using ContentParent = mozilla::dom::ContentParent;
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using ThreadsafeContentParentHandle =
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mozilla::dom::ThreadsafeContentParentHandle;
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public:
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// This function allows the caller to determine if the given parent actor
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// corresponds to a child actor from another process or a child actor from a
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// different thread in the same process.
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// This function may only be called on the background thread.
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static bool IsOtherProcessActor(PBackgroundParent* aBackgroundActor);
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// This function returns a handle to the ContentParent associated with the
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// parent actor if the parent actor corresponds to a child actor from another
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// content process. If the parent actor corresponds to a child actor from a
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// different thread in the same process then this function returns null.
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//
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// This function may only be called on the background thread.
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static ThreadsafeContentParentHandle* GetContentParentHandle(
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PBackgroundParent* aBackgroundActor);
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static uint64_t GetChildID(PBackgroundParent* aBackgroundActor);
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private:
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// Only called by ContentParent for cross-process actors.
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static bool AllocStarter(ContentParent* aContent,
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Endpoint<PBackgroundStarterParent>&& aEndpoint);
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// Called by SocketProcessBridgeParent and SocketProcessParent for
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// cross-process actors.
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static bool AllocStarter(Endpoint<PBackgroundStarterParent>&& aEndpoint);
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};
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// Implemented in BackgroundImpl.cpp.
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bool IsOnBackgroundThread();
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#ifdef DEBUG
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// Implemented in BackgroundImpl.cpp.
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void AssertIsOnBackgroundThread();
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#else
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inline void AssertIsOnBackgroundThread() {}
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#endif // DEBUG
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inline void AssertIsInMainProcess() { MOZ_ASSERT(XRE_IsParentProcess()); }
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inline void AssertIsInMainOrSocketProcess() {
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MOZ_ASSERT(XRE_IsParentProcess() || XRE_IsSocketProcess());
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}
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} // namespace ipc
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} // namespace mozilla
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#endif // mozilla_ipc_backgroundparent_h__
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