зеркало из https://github.com/mozilla/gecko-dev.git
1618 строки
41 KiB
C++
1618 строки
41 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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#include "BackgroundChild.h"
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#include "BackgroundParent.h"
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#include "BackgroundChildImpl.h"
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#include "BackgroundParentImpl.h"
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#include "base/process_util.h"
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#include "base/task.h"
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#include "FileDescriptor.h"
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#include "GeckoProfiler.h"
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#include "InputStreamUtils.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/Atomics.h"
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#include "mozilla/ClearOnShutdown.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/Services.h"
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#include "mozilla/StaticPtr.h"
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#include "mozilla/Unused.h"
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#include "mozilla/dom/ContentChild.h"
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#include "mozilla/dom/ContentParent.h"
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#include "mozilla/dom/File.h"
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#include "mozilla/ipc/ProtocolTypes.h"
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#include "nsAutoPtr.h"
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#include "nsCOMPtr.h"
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#include "nsIEventTarget.h"
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#include "nsIMutable.h"
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#include "nsIObserver.h"
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#include "nsIObserverService.h"
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#include "nsIRunnable.h"
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#include "nsISupportsImpl.h"
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#include "nsIThread.h"
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#include "nsITimer.h"
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#include "nsTArray.h"
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#include "nsThreadUtils.h"
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#include "nsTraceRefcnt.h"
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#include "nsXULAppAPI.h"
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#include "nsXPCOMPrivate.h"
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#include "prthread.h"
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#ifdef RELEASE_OR_BETA
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#define THREADSAFETY_ASSERT MOZ_ASSERT
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#else
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#define THREADSAFETY_ASSERT MOZ_RELEASE_ASSERT
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#endif
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#define CRASH_IN_CHILD_PROCESS(_msg) \
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do { \
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if (XRE_IsParentProcess()) { \
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MOZ_ASSERT(false, _msg); \
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} else { \
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MOZ_CRASH(_msg); \
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} \
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} \
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while (0)
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using namespace mozilla;
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using namespace mozilla::dom;
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using namespace mozilla::ipc;
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namespace {
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class ChildImpl;
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// -----------------------------------------------------------------------------
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// Utility Functions
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// -----------------------------------------------------------------------------
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void
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AssertIsInMainProcess()
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{
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MOZ_ASSERT(XRE_IsParentProcess());
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}
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void
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AssertIsOnMainThread()
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{
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THREADSAFETY_ASSERT(NS_IsMainThread());
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}
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void
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AssertIsNotOnMainThread()
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{
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THREADSAFETY_ASSERT(!NS_IsMainThread());
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}
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// -----------------------------------------------------------------------------
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// ParentImpl Declaration
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// -----------------------------------------------------------------------------
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class ParentImpl final : public BackgroundParentImpl
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{
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friend class mozilla::ipc::BackgroundParent;
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public:
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class CreateCallback;
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private:
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class ShutdownObserver;
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class RequestMessageLoopRunnable;
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class ShutdownBackgroundThreadRunnable;
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class ForceCloseBackgroundActorsRunnable;
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class ConnectActorRunnable;
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class CreateActorHelper;
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struct MOZ_STACK_CLASS TimerCallbackClosure
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{
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nsIThread* mThread;
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nsTArray<ParentImpl*>* mLiveActors;
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TimerCallbackClosure(nsIThread* aThread, nsTArray<ParentImpl*>* aLiveActors)
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: mThread(aThread), mLiveActors(aLiveActors)
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{
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AssertIsInMainProcess();
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AssertIsOnMainThread();
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MOZ_ASSERT(aThread);
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MOZ_ASSERT(aLiveActors);
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}
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};
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// The length of time we will wait at shutdown for all actors to clean
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// themselves up before forcing them to be destroyed.
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static const uint32_t kShutdownTimerDelayMS = 10000;
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// This is only modified on the main thread. It is null if the thread does not
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// exist or is shutting down.
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static StaticRefPtr<nsIThread> sBackgroundThread;
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// This is created and destroyed on the main thread but only modified on the
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// background thread. It is specific to each instance of sBackgroundThread.
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static nsTArray<ParentImpl*>* sLiveActorsForBackgroundThread;
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// This is only modified on the main thread.
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static StaticRefPtr<nsITimer> sShutdownTimer;
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// This exists so that that [Assert]IsOnBackgroundThread() can continue to
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// work during shutdown.
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static Atomic<PRThread*> sBackgroundPRThread;
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// This is only modified on the main thread. It is null if the thread does not
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// exist or is shutting down.
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static MessageLoop* sBackgroundThreadMessageLoop;
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// This is only modified on the main thread. It maintains a count of live
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// actors so that the background thread can be shut down when it is no longer
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// needed.
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static uint64_t sLiveActorCount;
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// This is only modified on the main thread. It is true after the shutdown
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// observer is registered and is never unset thereafter.
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static bool sShutdownObserverRegistered;
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// This is only modified on the main thread. It prevents us from trying to
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// create the background thread after application shutdown has started.
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static bool sShutdownHasStarted;
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// Only touched on the main thread, null if this is a same-process actor.
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RefPtr<ContentParent> mContent;
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// Set when the actor is opened successfully and used to handle shutdown
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// hangs. Only touched on the background thread.
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nsTArray<ParentImpl*>* mLiveActorArray;
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// Set at construction to indicate whether this parent actor corresponds to a
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// child actor in another process or to a child actor from a different thread
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// in the same process.
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const bool mIsOtherProcessActor;
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// Set after ActorDestroy has been called. Only touched on the background
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// thread.
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bool mActorDestroyed;
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public:
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static already_AddRefed<ChildImpl>
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CreateActorForSameProcess();
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static bool
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IsOnBackgroundThread()
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{
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return PR_GetCurrentThread() == sBackgroundPRThread;
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}
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static void
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AssertIsOnBackgroundThread()
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{
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THREADSAFETY_ASSERT(IsOnBackgroundThread());
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}
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NS_INLINE_DECL_REFCOUNTING(ParentImpl)
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void
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Destroy();
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private:
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// Forwarded from BackgroundParent.
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static bool
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IsOtherProcessActor(PBackgroundParent* aBackgroundActor);
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// Forwarded from BackgroundParent.
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static already_AddRefed<ContentParent>
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GetContentParent(PBackgroundParent* aBackgroundActor);
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// Forwarded from BackgroundParent.
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static intptr_t
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GetRawContentParentForComparison(PBackgroundParent* aBackgroundActor);
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// Forwarded from BackgroundParent.
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static uint64_t
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GetChildID(PBackgroundParent* aBackgroundActor);
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// Forwarded from BackgroundParent.
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static bool
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GetLiveActorArray(PBackgroundParent* aBackgroundActor,
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nsTArray<PBackgroundParent*>& aLiveActorArray);
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// Forwarded from BackgroundParent.
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static bool
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Alloc(ContentParent* aContent,
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Endpoint<PBackgroundParent>&& aEndpoint);
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static bool
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CreateBackgroundThread();
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static void
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ShutdownBackgroundThread();
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static void
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ShutdownTimerCallback(nsITimer* aTimer, void* aClosure);
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// For same-process actors.
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ParentImpl()
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: mLiveActorArray(nullptr), mIsOtherProcessActor(false),
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mActorDestroyed(false)
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{
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AssertIsInMainProcess();
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AssertIsOnMainThread();
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}
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// For other-process actors.
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explicit ParentImpl(ContentParent* aContent)
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: mContent(aContent), mLiveActorArray(nullptr),
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mIsOtherProcessActor(true), mActorDestroyed(false)
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{
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AssertIsInMainProcess();
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AssertIsOnMainThread();
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MOZ_ASSERT(aContent);
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}
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~ParentImpl()
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{
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AssertIsInMainProcess();
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AssertIsOnMainThread();
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MOZ_ASSERT(!mContent);
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}
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void
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MainThreadActorDestroy();
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void
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SetLiveActorArray(nsTArray<ParentImpl*>* aLiveActorArray)
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{
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AssertIsInMainProcess();
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AssertIsOnBackgroundThread();
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MOZ_ASSERT(aLiveActorArray);
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MOZ_ASSERT(!aLiveActorArray->Contains(this));
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MOZ_ASSERT(!mLiveActorArray);
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MOZ_ASSERT(mIsOtherProcessActor);
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mLiveActorArray = aLiveActorArray;
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mLiveActorArray->AppendElement(this);
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}
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// These methods are only called by IPDL.
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virtual void
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ActorDestroy(ActorDestroyReason aWhy) override;
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};
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// -----------------------------------------------------------------------------
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// ChildImpl Declaration
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// -----------------------------------------------------------------------------
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class ChildImpl final : public BackgroundChildImpl
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{
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friend class mozilla::ipc::BackgroundChild;
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friend class mozilla::ipc::BackgroundChildImpl;
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typedef base::ProcessId ProcessId;
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typedef mozilla::ipc::Transport Transport;
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class ShutdownObserver;
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class ActorCreatedRunnable;
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// A thread-local index that is not valid.
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static const unsigned int kBadThreadLocalIndex =
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static_cast<unsigned int>(-1);
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// This is only modified on the main thread. It is the thread-local index that
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// we use to store the BackgroundChild for each thread.
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static unsigned int sThreadLocalIndex;
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struct ThreadLocalInfo
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{
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ThreadLocalInfo()
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#ifdef DEBUG
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: mClosed(false)
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#endif
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{
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}
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RefPtr<ChildImpl> mActor;
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nsAutoPtr<BackgroundChildImpl::ThreadLocal> mConsumerThreadLocal;
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#ifdef DEBUG
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bool mClosed;
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#endif
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};
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// On the main thread, we store TLS in this global instead of in
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// sThreadLocalIndex. That way, cooperative main threads all share the same
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// thread info.
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static ThreadLocalInfo* sMainThreadInfo;
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// This is only modified on the main thread. It prevents us from trying to
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// create the background thread after application shutdown has started.
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static bool sShutdownHasStarted;
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#if defined(DEBUG) || !defined(RELEASE_OR_BETA)
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nsISerialEventTarget* mOwningEventTarget;
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#endif
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#ifdef DEBUG
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bool mActorWasAlive;
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bool mActorDestroyed;
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#endif
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public:
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static void
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Shutdown();
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void
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AssertIsOnOwningThread()
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{
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THREADSAFETY_ASSERT(mOwningEventTarget);
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#ifdef RELEASE_OR_BETA
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DebugOnly<bool> current;
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#else
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bool current;
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#endif
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THREADSAFETY_ASSERT(
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NS_SUCCEEDED(mOwningEventTarget->IsOnCurrentThread(¤t)));
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THREADSAFETY_ASSERT(current);
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}
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void
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AssertActorDestroyed()
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{
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MOZ_ASSERT(mActorDestroyed, "ChildImpl::ActorDestroy not called in time");
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}
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explicit ChildImpl()
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#if defined(DEBUG) || !defined(RELEASE_OR_BETA)
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: mOwningEventTarget(GetCurrentThreadSerialEventTarget())
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#endif
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#ifdef DEBUG
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, mActorWasAlive(false)
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, mActorDestroyed(false)
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#endif
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{
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AssertIsOnOwningThread();
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}
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void
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SetActorAlive()
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{
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AssertIsOnOwningThread();
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MOZ_ASSERT(!mActorWasAlive);
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MOZ_ASSERT(!mActorDestroyed);
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#ifdef DEBUG
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mActorWasAlive = true;
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#endif
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}
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NS_INLINE_DECL_REFCOUNTING(ChildImpl)
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private:
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// Forwarded from BackgroundChild.
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static void
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Startup();
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// Forwarded from BackgroundChild.
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static PBackgroundChild*
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GetForCurrentThread();
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// Forwarded from BackgroundChild.
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static PBackgroundChild*
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GetOrCreateForCurrentThread();
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// Forwarded from BackgroundChild.
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static void
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CloseForCurrentThread();
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// Forwarded from BackgroundChildImpl.
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static BackgroundChildImpl::ThreadLocal*
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GetThreadLocalForCurrentThread();
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static void
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ThreadLocalDestructor(void* aThreadLocal)
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{
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auto threadLocalInfo = static_cast<ThreadLocalInfo*>(aThreadLocal);
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if (threadLocalInfo) {
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MOZ_ASSERT(threadLocalInfo->mClosed);
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if (threadLocalInfo->mActor) {
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threadLocalInfo->mActor->Close();
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threadLocalInfo->mActor->AssertActorDestroyed();
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}
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delete threadLocalInfo;
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}
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}
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// This class is reference counted.
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~ChildImpl()
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{
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MOZ_ASSERT_IF(mActorWasAlive, mActorDestroyed);
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}
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// Only called by IPDL.
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virtual void
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ActorDestroy(ActorDestroyReason aWhy) override;
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};
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// -----------------------------------------------------------------------------
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// ParentImpl Helper Declarations
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// -----------------------------------------------------------------------------
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class ParentImpl::ShutdownObserver final : public nsIObserver
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{
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public:
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ShutdownObserver()
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{
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AssertIsOnMainThread();
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}
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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private:
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~ShutdownObserver()
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{
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AssertIsOnMainThread();
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}
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};
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class ParentImpl::RequestMessageLoopRunnable final : public Runnable
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{
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nsCOMPtr<nsIThread> mTargetThread;
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MessageLoop* mMessageLoop;
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public:
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explicit RequestMessageLoopRunnable(nsIThread* aTargetThread)
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: Runnable("Background::ParentImpl::RequestMessageLoopRunnable")
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, mTargetThread(aTargetThread)
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, mMessageLoop(nullptr)
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{
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AssertIsInMainProcess();
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AssertIsOnMainThread();
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MOZ_ASSERT(aTargetThread);
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}
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private:
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~RequestMessageLoopRunnable()
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{ }
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NS_DECL_NSIRUNNABLE
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};
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class ParentImpl::ShutdownBackgroundThreadRunnable final : public Runnable
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{
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public:
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ShutdownBackgroundThreadRunnable()
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: Runnable("Background::ParentImpl::ShutdownBackgroundThreadRunnable")
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{
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AssertIsInMainProcess();
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AssertIsOnMainThread();
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}
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private:
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~ShutdownBackgroundThreadRunnable()
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{ }
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NS_DECL_NSIRUNNABLE
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};
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class ParentImpl::ForceCloseBackgroundActorsRunnable final : public Runnable
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{
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nsTArray<ParentImpl*>* mActorArray;
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public:
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explicit ForceCloseBackgroundActorsRunnable(nsTArray<ParentImpl*>* aActorArray)
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: Runnable("Background::ParentImpl::ForceCloseBackgroundActorsRunnable")
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, mActorArray(aActorArray)
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{
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AssertIsInMainProcess();
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AssertIsOnMainThread();
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MOZ_ASSERT(aActorArray);
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}
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private:
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~ForceCloseBackgroundActorsRunnable()
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{ }
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NS_DECL_NSIRUNNABLE
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};
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class ParentImpl::ConnectActorRunnable final : public Runnable
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{
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RefPtr<ParentImpl> mActor;
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Endpoint<PBackgroundParent> mEndpoint;
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nsTArray<ParentImpl*>* mLiveActorArray;
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public:
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ConnectActorRunnable(ParentImpl* aActor,
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Endpoint<PBackgroundParent>&& aEndpoint,
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nsTArray<ParentImpl*>* aLiveActorArray)
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: Runnable("Background::ParentImpl::ConnectActorRunnable")
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, mActor(aActor)
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, mEndpoint(Move(aEndpoint))
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, mLiveActorArray(aLiveActorArray)
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{
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AssertIsInMainProcess();
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AssertIsOnMainThread();
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MOZ_ASSERT(mEndpoint.IsValid());
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MOZ_ASSERT(aLiveActorArray);
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}
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private:
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~ConnectActorRunnable()
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{
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AssertIsInMainProcess();
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}
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NS_DECL_NSIRUNNABLE
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};
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class ParentImpl::CreateActorHelper final : public Runnable
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{
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mozilla::Monitor mMonitor;
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RefPtr<ParentImpl> mParentActor;
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nsCOMPtr<nsIThread> mThread;
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nsresult mMainThreadResultCode;
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bool mWaiting;
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public:
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explicit CreateActorHelper()
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: Runnable("Background::ParentImpl::CreateActorHelper")
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, mMonitor("CreateActorHelper::mMonitor")
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, mMainThreadResultCode(NS_OK)
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, mWaiting(true)
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{
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AssertIsInMainProcess();
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AssertIsNotOnMainThread();
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}
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nsresult
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BlockAndGetResults(RefPtr<ParentImpl>& aParentActor,
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nsCOMPtr<nsIThread>& aThread);
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private:
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~CreateActorHelper()
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{
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AssertIsInMainProcess();
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}
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nsresult
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RunOnMainThread();
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NS_DECL_NSIRUNNABLE
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};
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class NS_NO_VTABLE ParentImpl::CreateCallback
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{
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public:
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NS_INLINE_DECL_REFCOUNTING(CreateCallback)
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virtual void
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Success(already_AddRefed<ParentImpl> aActor, MessageLoop* aMessageLoop) = 0;
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|
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virtual void
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Failure() = 0;
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protected:
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virtual ~CreateCallback()
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{ }
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};
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// -----------------------------------------------------------------------------
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// ChildImpl Helper Declarations
|
|
// -----------------------------------------------------------------------------
|
|
|
|
class ChildImpl::ShutdownObserver final : public nsIObserver
|
|
{
|
|
public:
|
|
ShutdownObserver()
|
|
{
|
|
AssertIsOnMainThread();
|
|
}
|
|
|
|
NS_DECL_ISUPPORTS
|
|
NS_DECL_NSIOBSERVER
|
|
|
|
private:
|
|
~ShutdownObserver()
|
|
{
|
|
AssertIsOnMainThread();
|
|
}
|
|
};
|
|
|
|
} // namespace
|
|
|
|
namespace mozilla {
|
|
namespace ipc {
|
|
|
|
bool
|
|
IsOnBackgroundThread()
|
|
{
|
|
return ParentImpl::IsOnBackgroundThread();
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
|
|
void
|
|
AssertIsOnBackgroundThread()
|
|
{
|
|
ParentImpl::AssertIsOnBackgroundThread();
|
|
}
|
|
|
|
#endif // DEBUG
|
|
|
|
} // namespace ipc
|
|
} // namespace mozilla
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// BackgroundParent Public Methods
|
|
// -----------------------------------------------------------------------------
|
|
|
|
// static
|
|
bool
|
|
BackgroundParent::IsOtherProcessActor(PBackgroundParent* aBackgroundActor)
|
|
{
|
|
return ParentImpl::IsOtherProcessActor(aBackgroundActor);
|
|
}
|
|
|
|
// static
|
|
already_AddRefed<ContentParent>
|
|
BackgroundParent::GetContentParent(PBackgroundParent* aBackgroundActor)
|
|
{
|
|
return ParentImpl::GetContentParent(aBackgroundActor);
|
|
}
|
|
|
|
// static
|
|
intptr_t
|
|
BackgroundParent::GetRawContentParentForComparison(
|
|
PBackgroundParent* aBackgroundActor)
|
|
{
|
|
return ParentImpl::GetRawContentParentForComparison(aBackgroundActor);
|
|
}
|
|
|
|
// static
|
|
uint64_t
|
|
BackgroundParent::GetChildID(PBackgroundParent* aBackgroundActor)
|
|
{
|
|
return ParentImpl::GetChildID(aBackgroundActor);
|
|
}
|
|
|
|
// static
|
|
bool
|
|
BackgroundParent::GetLiveActorArray(
|
|
PBackgroundParent* aBackgroundActor,
|
|
nsTArray<PBackgroundParent*>& aLiveActorArray)
|
|
{
|
|
return ParentImpl::GetLiveActorArray(aBackgroundActor, aLiveActorArray);
|
|
}
|
|
|
|
// static
|
|
bool
|
|
BackgroundParent::Alloc(ContentParent* aContent,
|
|
Endpoint<PBackgroundParent>&& aEndpoint)
|
|
{
|
|
return ParentImpl::Alloc(aContent, Move(aEndpoint));
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// BackgroundChild Public Methods
|
|
// -----------------------------------------------------------------------------
|
|
|
|
// static
|
|
void
|
|
BackgroundChild::Startup()
|
|
{
|
|
ChildImpl::Startup();
|
|
}
|
|
|
|
// static
|
|
PBackgroundChild*
|
|
BackgroundChild::GetForCurrentThread()
|
|
{
|
|
return ChildImpl::GetForCurrentThread();
|
|
}
|
|
|
|
// static
|
|
PBackgroundChild*
|
|
BackgroundChild::GetOrCreateForCurrentThread()
|
|
{
|
|
return ChildImpl::GetOrCreateForCurrentThread();
|
|
}
|
|
|
|
// static
|
|
void
|
|
BackgroundChild::CloseForCurrentThread()
|
|
{
|
|
ChildImpl::CloseForCurrentThread();
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// BackgroundChildImpl Public Methods
|
|
// -----------------------------------------------------------------------------
|
|
|
|
// static
|
|
BackgroundChildImpl::ThreadLocal*
|
|
BackgroundChildImpl::GetThreadLocalForCurrentThread()
|
|
{
|
|
return ChildImpl::GetThreadLocalForCurrentThread();
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// ParentImpl Static Members
|
|
// -----------------------------------------------------------------------------
|
|
|
|
StaticRefPtr<nsIThread> ParentImpl::sBackgroundThread;
|
|
|
|
nsTArray<ParentImpl*>* ParentImpl::sLiveActorsForBackgroundThread;
|
|
|
|
StaticRefPtr<nsITimer> ParentImpl::sShutdownTimer;
|
|
|
|
Atomic<PRThread*> ParentImpl::sBackgroundPRThread;
|
|
|
|
MessageLoop* ParentImpl::sBackgroundThreadMessageLoop = nullptr;
|
|
|
|
uint64_t ParentImpl::sLiveActorCount = 0;
|
|
|
|
bool ParentImpl::sShutdownObserverRegistered = false;
|
|
|
|
bool ParentImpl::sShutdownHasStarted = false;
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// ChildImpl Static Members
|
|
// -----------------------------------------------------------------------------
|
|
|
|
unsigned int ChildImpl::sThreadLocalIndex = kBadThreadLocalIndex;
|
|
|
|
bool ChildImpl::sShutdownHasStarted = false;
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// ParentImpl Implementation
|
|
// -----------------------------------------------------------------------------
|
|
|
|
// static
|
|
bool
|
|
ParentImpl::IsOtherProcessActor(PBackgroundParent* aBackgroundActor)
|
|
{
|
|
AssertIsOnBackgroundThread();
|
|
MOZ_ASSERT(aBackgroundActor);
|
|
|
|
return static_cast<ParentImpl*>(aBackgroundActor)->mIsOtherProcessActor;
|
|
}
|
|
|
|
// static
|
|
already_AddRefed<ContentParent>
|
|
ParentImpl::GetContentParent(PBackgroundParent* aBackgroundActor)
|
|
{
|
|
AssertIsOnBackgroundThread();
|
|
MOZ_ASSERT(aBackgroundActor);
|
|
|
|
auto actor = static_cast<ParentImpl*>(aBackgroundActor);
|
|
if (actor->mActorDestroyed) {
|
|
MOZ_ASSERT(false, "GetContentParent called after ActorDestroy was called!");
|
|
return nullptr;
|
|
}
|
|
|
|
if (actor->mContent) {
|
|
// We need to hand out a reference to our ContentParent but we also need to
|
|
// keep the one we have. We can't call AddRef here because ContentParent is
|
|
// not threadsafe so instead we dispatch a runnable to the main thread to do
|
|
// it for us. This is safe since we are guaranteed that our AddRef runnable
|
|
// will run before the reference we hand out can be released, and the
|
|
// ContentParent can't die as long as the existing reference is maintained.
|
|
MOZ_ALWAYS_SUCCEEDS(
|
|
NS_DispatchToMainThread(NewNonOwningRunnableMethod("ContentParent::AddRef",
|
|
actor->mContent, &ContentParent::AddRef)));
|
|
}
|
|
|
|
return already_AddRefed<ContentParent>(actor->mContent.get());
|
|
}
|
|
|
|
// static
|
|
intptr_t
|
|
ParentImpl::GetRawContentParentForComparison(
|
|
PBackgroundParent* aBackgroundActor)
|
|
{
|
|
AssertIsOnBackgroundThread();
|
|
MOZ_ASSERT(aBackgroundActor);
|
|
|
|
auto actor = static_cast<ParentImpl*>(aBackgroundActor);
|
|
if (actor->mActorDestroyed) {
|
|
MOZ_ASSERT(false,
|
|
"GetRawContentParentForComparison called after ActorDestroy was "
|
|
"called!");
|
|
return intptr_t(-1);
|
|
}
|
|
|
|
return intptr_t(static_cast<nsIContentParent*>(actor->mContent.get()));
|
|
}
|
|
|
|
// static
|
|
uint64_t
|
|
ParentImpl::GetChildID(PBackgroundParent* aBackgroundActor)
|
|
{
|
|
AssertIsOnBackgroundThread();
|
|
MOZ_ASSERT(aBackgroundActor);
|
|
|
|
auto actor = static_cast<ParentImpl*>(aBackgroundActor);
|
|
if (actor->mActorDestroyed) {
|
|
MOZ_ASSERT(false, "GetContentParent called after ActorDestroy was called!");
|
|
return 0;
|
|
}
|
|
|
|
if (actor->mContent) {
|
|
return actor->mContent->ChildID();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// static
|
|
bool
|
|
ParentImpl::GetLiveActorArray(PBackgroundParent* aBackgroundActor,
|
|
nsTArray<PBackgroundParent*>& aLiveActorArray)
|
|
{
|
|
AssertIsOnBackgroundThread();
|
|
MOZ_ASSERT(aBackgroundActor);
|
|
MOZ_ASSERT(aLiveActorArray.IsEmpty());
|
|
|
|
auto actor = static_cast<ParentImpl*>(aBackgroundActor);
|
|
if (actor->mActorDestroyed) {
|
|
MOZ_ASSERT(false,
|
|
"GetLiveActorArray called after ActorDestroy was called!");
|
|
return false;
|
|
}
|
|
|
|
if (!actor->mLiveActorArray) {
|
|
return true;
|
|
}
|
|
|
|
for (ParentImpl* liveActor : *actor->mLiveActorArray) {
|
|
aLiveActorArray.AppendElement(liveActor);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// static
|
|
bool
|
|
ParentImpl::Alloc(ContentParent* aContent,
|
|
Endpoint<PBackgroundParent>&& aEndpoint)
|
|
{
|
|
AssertIsInMainProcess();
|
|
AssertIsOnMainThread();
|
|
MOZ_ASSERT(aEndpoint.IsValid());
|
|
|
|
if (!sBackgroundThread && !CreateBackgroundThread()) {
|
|
NS_WARNING("Failed to create background thread!");
|
|
return false;
|
|
}
|
|
|
|
MOZ_ASSERT(sLiveActorsForBackgroundThread);
|
|
|
|
sLiveActorCount++;
|
|
|
|
RefPtr<ParentImpl> actor = new ParentImpl(aContent);
|
|
|
|
nsCOMPtr<nsIRunnable> connectRunnable =
|
|
new ConnectActorRunnable(actor, Move(aEndpoint),
|
|
sLiveActorsForBackgroundThread);
|
|
|
|
if (NS_FAILED(sBackgroundThread->Dispatch(connectRunnable,
|
|
NS_DISPATCH_NORMAL))) {
|
|
NS_WARNING("Failed to dispatch connect runnable!");
|
|
|
|
MOZ_ASSERT(sLiveActorCount);
|
|
sLiveActorCount--;
|
|
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// static
|
|
already_AddRefed<ChildImpl>
|
|
ParentImpl::CreateActorForSameProcess()
|
|
{
|
|
AssertIsInMainProcess();
|
|
|
|
RefPtr<ParentImpl> parentActor;
|
|
nsCOMPtr<nsIThread> backgroundThread;
|
|
|
|
if (NS_IsMainThread()) {
|
|
if (!sBackgroundThread && !CreateBackgroundThread()) {
|
|
NS_WARNING("Failed to create background thread!");
|
|
return nullptr;
|
|
}
|
|
|
|
MOZ_ASSERT(!sShutdownHasStarted);
|
|
|
|
sLiveActorCount++;
|
|
|
|
parentActor = new ParentImpl();
|
|
backgroundThread = sBackgroundThread.get();
|
|
} else {
|
|
RefPtr<CreateActorHelper> helper = new CreateActorHelper();
|
|
|
|
nsresult rv = helper->BlockAndGetResults(parentActor, backgroundThread);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
RefPtr<ChildImpl> childActor = new ChildImpl();
|
|
|
|
MessageChannel* parentChannel = parentActor->GetIPCChannel();
|
|
MOZ_ASSERT(parentChannel);
|
|
|
|
if (!childActor->Open(parentChannel, backgroundThread, ChildSide)) {
|
|
NS_WARNING("Failed to open ChildImpl!");
|
|
|
|
// Can't release it here, we will release this reference in Destroy.
|
|
ParentImpl* actor;
|
|
parentActor.forget(&actor);
|
|
|
|
actor->Destroy();
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
childActor->SetActorAlive();
|
|
|
|
// Make sure the parent knows it is same process.
|
|
parentActor->SetOtherProcessId(base::GetCurrentProcId());
|
|
|
|
// Now that Open() has succeeded transfer the ownership of the actors to IPDL.
|
|
Unused << parentActor.forget();
|
|
|
|
return childActor.forget();
|
|
}
|
|
|
|
// static
|
|
bool
|
|
ParentImpl::CreateBackgroundThread()
|
|
{
|
|
AssertIsInMainProcess();
|
|
AssertIsOnMainThread();
|
|
MOZ_ASSERT(!sBackgroundThread);
|
|
MOZ_ASSERT(!sLiveActorsForBackgroundThread);
|
|
|
|
if (sShutdownHasStarted) {
|
|
NS_WARNING("Trying to create background thread after shutdown has "
|
|
"already begun!");
|
|
return false;
|
|
}
|
|
|
|
nsCOMPtr<nsITimer> newShutdownTimer;
|
|
|
|
if (!sShutdownTimer) {
|
|
newShutdownTimer = NS_NewTimer();
|
|
if (!newShutdownTimer) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (!sShutdownObserverRegistered) {
|
|
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
|
|
if (NS_WARN_IF(!obs)) {
|
|
return false;
|
|
}
|
|
|
|
nsCOMPtr<nsIObserver> observer = new ShutdownObserver();
|
|
|
|
nsresult rv =
|
|
obs->AddObserver(observer, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID, false);
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
return false;
|
|
}
|
|
|
|
sShutdownObserverRegistered = true;
|
|
}
|
|
|
|
nsCOMPtr<nsIThread> thread;
|
|
if (NS_FAILED(NS_NewNamedThread("IPDL Background", getter_AddRefs(thread)))) {
|
|
NS_WARNING("NS_NewNamedThread failed!");
|
|
return false;
|
|
}
|
|
|
|
nsCOMPtr<nsIRunnable> messageLoopRunnable =
|
|
new RequestMessageLoopRunnable(thread);
|
|
if (NS_FAILED(thread->Dispatch(messageLoopRunnable, NS_DISPATCH_NORMAL))) {
|
|
NS_WARNING("Failed to dispatch RequestMessageLoopRunnable!");
|
|
return false;
|
|
}
|
|
|
|
sBackgroundThread = thread;
|
|
sLiveActorsForBackgroundThread = new nsTArray<ParentImpl*>(1);
|
|
|
|
if (!sShutdownTimer) {
|
|
MOZ_ASSERT(newShutdownTimer);
|
|
sShutdownTimer = newShutdownTimer;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// static
|
|
void
|
|
ParentImpl::ShutdownBackgroundThread()
|
|
{
|
|
AssertIsInMainProcess();
|
|
AssertIsOnMainThread();
|
|
MOZ_ASSERT(sShutdownHasStarted);
|
|
MOZ_ASSERT_IF(!sBackgroundThread, !sLiveActorCount);
|
|
MOZ_ASSERT_IF(sBackgroundThread, sShutdownTimer);
|
|
|
|
nsCOMPtr<nsITimer> shutdownTimer = sShutdownTimer.get();
|
|
sShutdownTimer = nullptr;
|
|
|
|
if (sBackgroundThread) {
|
|
nsCOMPtr<nsIThread> thread = sBackgroundThread.get();
|
|
sBackgroundThread = nullptr;
|
|
|
|
nsAutoPtr<nsTArray<ParentImpl*>> liveActors(sLiveActorsForBackgroundThread);
|
|
sLiveActorsForBackgroundThread = nullptr;
|
|
|
|
MOZ_ASSERT_IF(!sShutdownHasStarted, !sLiveActorCount);
|
|
|
|
if (sLiveActorCount) {
|
|
// We need to spin the event loop while we wait for all the actors to be
|
|
// cleaned up. We also set a timeout to force-kill any hanging actors.
|
|
TimerCallbackClosure closure(thread, liveActors);
|
|
|
|
MOZ_ALWAYS_SUCCEEDS(
|
|
shutdownTimer->InitWithNamedFuncCallback(&ShutdownTimerCallback,
|
|
&closure,
|
|
kShutdownTimerDelayMS,
|
|
nsITimer::TYPE_ONE_SHOT,
|
|
"ParentImpl::ShutdownTimerCallback"));
|
|
|
|
SpinEventLoopUntil([&]() { return !sLiveActorCount; });
|
|
|
|
MOZ_ASSERT(liveActors->IsEmpty());
|
|
|
|
MOZ_ALWAYS_SUCCEEDS(shutdownTimer->Cancel());
|
|
}
|
|
|
|
// Dispatch this runnable to unregister the thread from the profiler.
|
|
nsCOMPtr<nsIRunnable> shutdownRunnable =
|
|
new ShutdownBackgroundThreadRunnable();
|
|
MOZ_ALWAYS_SUCCEEDS(thread->Dispatch(shutdownRunnable, NS_DISPATCH_NORMAL));
|
|
|
|
MOZ_ALWAYS_SUCCEEDS(thread->Shutdown());
|
|
}
|
|
}
|
|
|
|
// static
|
|
void
|
|
ParentImpl::ShutdownTimerCallback(nsITimer* aTimer, void* aClosure)
|
|
{
|
|
AssertIsInMainProcess();
|
|
AssertIsOnMainThread();
|
|
MOZ_ASSERT(sShutdownHasStarted);
|
|
MOZ_ASSERT(sLiveActorCount);
|
|
|
|
auto closure = static_cast<TimerCallbackClosure*>(aClosure);
|
|
MOZ_ASSERT(closure);
|
|
|
|
// Don't let the stack unwind until the ForceCloseBackgroundActorsRunnable has
|
|
// finished.
|
|
sLiveActorCount++;
|
|
|
|
nsCOMPtr<nsIRunnable> forceCloseRunnable =
|
|
new ForceCloseBackgroundActorsRunnable(closure->mLiveActors);
|
|
MOZ_ALWAYS_SUCCEEDS(closure->mThread->Dispatch(forceCloseRunnable,
|
|
NS_DISPATCH_NORMAL));
|
|
}
|
|
|
|
void
|
|
ParentImpl::Destroy()
|
|
{
|
|
// May be called on any thread!
|
|
|
|
AssertIsInMainProcess();
|
|
|
|
MOZ_ALWAYS_SUCCEEDS(
|
|
NS_DispatchToMainThread(NewNonOwningRunnableMethod("ParentImpl::MainThreadActorDestroy",
|
|
this, &ParentImpl::MainThreadActorDestroy)));
|
|
}
|
|
|
|
void
|
|
ParentImpl::MainThreadActorDestroy()
|
|
{
|
|
AssertIsInMainProcess();
|
|
AssertIsOnMainThread();
|
|
MOZ_ASSERT_IF(mIsOtherProcessActor, mContent);
|
|
MOZ_ASSERT_IF(!mIsOtherProcessActor, !mContent);
|
|
|
|
mContent = nullptr;
|
|
|
|
MOZ_ASSERT(sLiveActorCount);
|
|
sLiveActorCount--;
|
|
|
|
// This may be the last reference!
|
|
Release();
|
|
}
|
|
|
|
void
|
|
ParentImpl::ActorDestroy(ActorDestroyReason aWhy)
|
|
{
|
|
AssertIsInMainProcess();
|
|
AssertIsOnBackgroundThread();
|
|
MOZ_ASSERT(!mActorDestroyed);
|
|
MOZ_ASSERT_IF(mIsOtherProcessActor, mLiveActorArray);
|
|
|
|
BackgroundParentImpl::ActorDestroy(aWhy);
|
|
|
|
mActorDestroyed = true;
|
|
|
|
if (mLiveActorArray) {
|
|
MOZ_ALWAYS_TRUE(mLiveActorArray->RemoveElement(this));
|
|
mLiveActorArray = nullptr;
|
|
}
|
|
|
|
// This is tricky. We should be able to call Destroy() here directly because
|
|
// we're not going to touch 'this' or our MessageChannel any longer on this
|
|
// thread. Destroy() dispatches the MainThreadActorDestroy runnable and when
|
|
// it runs it will destroy 'this' and our associated MessageChannel. However,
|
|
// IPDL is about to call MessageChannel::Clear() on this thread! To avoid
|
|
// racing with the main thread we must ensure that the MessageChannel lives
|
|
// long enough to be cleared in this call stack.
|
|
|
|
MOZ_ALWAYS_SUCCEEDS(
|
|
NS_DispatchToCurrentThread(NewNonOwningRunnableMethod("ParentImpl::Destroy",
|
|
this, &ParentImpl::Destroy)));
|
|
}
|
|
|
|
NS_IMPL_ISUPPORTS(ParentImpl::ShutdownObserver, nsIObserver)
|
|
|
|
NS_IMETHODIMP
|
|
ParentImpl::ShutdownObserver::Observe(nsISupports* aSubject,
|
|
const char* aTopic,
|
|
const char16_t* aData)
|
|
{
|
|
AssertIsInMainProcess();
|
|
AssertIsOnMainThread();
|
|
MOZ_ASSERT(!sShutdownHasStarted);
|
|
MOZ_ASSERT(!strcmp(aTopic, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID));
|
|
|
|
sShutdownHasStarted = true;
|
|
|
|
// Do this first before calling (and spinning the event loop in)
|
|
// ShutdownBackgroundThread().
|
|
ChildImpl::Shutdown();
|
|
|
|
ShutdownBackgroundThread();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
ParentImpl::RequestMessageLoopRunnable::Run()
|
|
{
|
|
AssertIsInMainProcess();
|
|
MOZ_ASSERT(mTargetThread);
|
|
|
|
if (NS_IsMainThread()) {
|
|
MOZ_ASSERT(mMessageLoop);
|
|
|
|
if (!sBackgroundThread ||
|
|
!SameCOMIdentity(mTargetThread.get(), sBackgroundThread.get())) {
|
|
return NS_OK;
|
|
}
|
|
|
|
MOZ_ASSERT(!sBackgroundThreadMessageLoop);
|
|
sBackgroundThreadMessageLoop = mMessageLoop;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
{
|
|
bool correctThread;
|
|
MOZ_ASSERT(NS_SUCCEEDED(mTargetThread->IsOnCurrentThread(&correctThread)));
|
|
MOZ_ASSERT(correctThread);
|
|
}
|
|
#endif
|
|
|
|
DebugOnly<PRThread*> oldBackgroundThread =
|
|
sBackgroundPRThread.exchange(PR_GetCurrentThread());
|
|
|
|
MOZ_ASSERT_IF(oldBackgroundThread,
|
|
PR_GetCurrentThread() != oldBackgroundThread);
|
|
|
|
MOZ_ASSERT(!mMessageLoop);
|
|
|
|
mMessageLoop = MessageLoop::current();
|
|
MOZ_ASSERT(mMessageLoop);
|
|
|
|
if (NS_FAILED(NS_DispatchToMainThread(this))) {
|
|
NS_WARNING("Failed to dispatch RequestMessageLoopRunnable to main thread!");
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
ParentImpl::ShutdownBackgroundThreadRunnable::Run()
|
|
{
|
|
AssertIsInMainProcess();
|
|
|
|
// It is possible that another background thread was created while this thread
|
|
// was shutting down. In that case we can't assert anything about
|
|
// sBackgroundPRThread and we should not modify it here.
|
|
sBackgroundPRThread.compareExchange(PR_GetCurrentThread(), nullptr);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
ParentImpl::ForceCloseBackgroundActorsRunnable::Run()
|
|
{
|
|
AssertIsInMainProcess();
|
|
MOZ_ASSERT(mActorArray);
|
|
|
|
if (NS_IsMainThread()) {
|
|
MOZ_ASSERT(sLiveActorCount);
|
|
sLiveActorCount--;
|
|
return NS_OK;
|
|
}
|
|
|
|
AssertIsOnBackgroundThread();
|
|
|
|
if (!mActorArray->IsEmpty()) {
|
|
// Copy the array since calling Close() could mutate the actual array.
|
|
nsTArray<ParentImpl*> actorsToClose(*mActorArray);
|
|
|
|
for (uint32_t index = 0; index < actorsToClose.Length(); index++) {
|
|
actorsToClose[index]->Close();
|
|
}
|
|
}
|
|
|
|
MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(this));
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
ParentImpl::ConnectActorRunnable::Run()
|
|
{
|
|
AssertIsInMainProcess();
|
|
AssertIsOnBackgroundThread();
|
|
|
|
// Transfer ownership to this thread. If Open() fails then we will release
|
|
// this reference in Destroy.
|
|
ParentImpl* actor;
|
|
mActor.forget(&actor);
|
|
|
|
Endpoint<PBackgroundParent> endpoint = Move(mEndpoint);
|
|
|
|
if (!endpoint.Bind(actor)) {
|
|
actor->Destroy();
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
actor->SetLiveActorArray(mLiveActorArray);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
ParentImpl::
|
|
CreateActorHelper::BlockAndGetResults(RefPtr<ParentImpl>& aParentActor,
|
|
nsCOMPtr<nsIThread>& aThread)
|
|
{
|
|
MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(this));
|
|
|
|
mozilla::MonitorAutoLock lock(mMonitor);
|
|
while (mWaiting) {
|
|
lock.Wait();
|
|
}
|
|
|
|
if (NS_WARN_IF(NS_FAILED(mMainThreadResultCode))) {
|
|
return mMainThreadResultCode;
|
|
}
|
|
|
|
aParentActor = Move(mParentActor);
|
|
aThread = Move(mThread);
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
ParentImpl::
|
|
CreateActorHelper::RunOnMainThread()
|
|
{
|
|
AssertIsOnMainThread();
|
|
|
|
if (!sBackgroundThread && !CreateBackgroundThread()) {
|
|
NS_WARNING("Failed to create background thread!");
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
MOZ_ASSERT(!sShutdownHasStarted);
|
|
|
|
sLiveActorCount++;
|
|
|
|
mParentActor = new ParentImpl();
|
|
mThread = sBackgroundThread;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
ParentImpl::
|
|
CreateActorHelper::Run()
|
|
{
|
|
AssertIsOnMainThread();
|
|
|
|
nsresult rv = RunOnMainThread();
|
|
if (NS_WARN_IF(NS_FAILED(rv))) {
|
|
mMainThreadResultCode = rv;
|
|
}
|
|
|
|
mozilla::MonitorAutoLock lock(mMonitor);
|
|
MOZ_ASSERT(mWaiting);
|
|
|
|
mWaiting = false;
|
|
lock.Notify();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// ChildImpl Implementation
|
|
// -----------------------------------------------------------------------------
|
|
|
|
// static
|
|
void
|
|
ChildImpl::Startup()
|
|
{
|
|
// This happens on the main thread but before XPCOM has started so we can't
|
|
// assert that we're being called on the main thread here.
|
|
|
|
MOZ_ASSERT(sThreadLocalIndex == kBadThreadLocalIndex,
|
|
"BackgroundChild::Startup() called more than once!");
|
|
|
|
PRStatus status =
|
|
PR_NewThreadPrivateIndex(&sThreadLocalIndex, ThreadLocalDestructor);
|
|
MOZ_RELEASE_ASSERT(status == PR_SUCCESS, "PR_NewThreadPrivateIndex failed!");
|
|
|
|
MOZ_ASSERT(sThreadLocalIndex != kBadThreadLocalIndex);
|
|
|
|
nsCOMPtr<nsIObserverService> observerService = services::GetObserverService();
|
|
MOZ_RELEASE_ASSERT(observerService);
|
|
|
|
nsCOMPtr<nsIObserver> observer = new ShutdownObserver();
|
|
|
|
nsresult rv =
|
|
observerService->AddObserver(observer,
|
|
NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID,
|
|
false);
|
|
MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
|
|
}
|
|
|
|
// static
|
|
void
|
|
ChildImpl::Shutdown()
|
|
{
|
|
AssertIsOnMainThread();
|
|
|
|
if (sShutdownHasStarted) {
|
|
MOZ_ASSERT_IF(sThreadLocalIndex != kBadThreadLocalIndex,
|
|
!PR_GetThreadPrivate(sThreadLocalIndex));
|
|
return;
|
|
}
|
|
|
|
sShutdownHasStarted = true;
|
|
|
|
MOZ_ASSERT(sThreadLocalIndex != kBadThreadLocalIndex);
|
|
|
|
ThreadLocalInfo* threadLocalInfo;
|
|
#ifdef DEBUG
|
|
threadLocalInfo = static_cast<ThreadLocalInfo*>(PR_GetThreadPrivate(sThreadLocalIndex));
|
|
MOZ_ASSERT(!threadLocalInfo);
|
|
#endif
|
|
threadLocalInfo = sMainThreadInfo;
|
|
|
|
if (threadLocalInfo) {
|
|
#ifdef DEBUG
|
|
MOZ_ASSERT(!threadLocalInfo->mClosed);
|
|
threadLocalInfo->mClosed = true;
|
|
#endif
|
|
|
|
ThreadLocalDestructor(threadLocalInfo);
|
|
}
|
|
}
|
|
|
|
ChildImpl::ThreadLocalInfo* ChildImpl::sMainThreadInfo = nullptr;
|
|
|
|
// static
|
|
PBackgroundChild*
|
|
ChildImpl::GetForCurrentThread()
|
|
{
|
|
MOZ_ASSERT(sThreadLocalIndex != kBadThreadLocalIndex);
|
|
|
|
auto threadLocalInfo =
|
|
NS_IsMainThread() ? sMainThreadInfo :
|
|
static_cast<ThreadLocalInfo*>(PR_GetThreadPrivate(sThreadLocalIndex));
|
|
|
|
if (!threadLocalInfo) {
|
|
return nullptr;
|
|
}
|
|
|
|
return threadLocalInfo->mActor;
|
|
}
|
|
|
|
/* static */
|
|
PBackgroundChild*
|
|
ChildImpl::GetOrCreateForCurrentThread()
|
|
{
|
|
MOZ_ASSERT(sThreadLocalIndex != kBadThreadLocalIndex,
|
|
"BackgroundChild::Startup() was never called!");
|
|
|
|
auto threadLocalInfo = NS_IsMainThread() ? sMainThreadInfo :
|
|
static_cast<ThreadLocalInfo*>(PR_GetThreadPrivate(sThreadLocalIndex));
|
|
|
|
if (!threadLocalInfo) {
|
|
nsAutoPtr<ThreadLocalInfo> newInfo(new ThreadLocalInfo());
|
|
|
|
if (NS_IsMainThread()) {
|
|
sMainThreadInfo = newInfo;
|
|
} else {
|
|
if (PR_SetThreadPrivate(sThreadLocalIndex, newInfo) != PR_SUCCESS) {
|
|
CRASH_IN_CHILD_PROCESS("PR_SetThreadPrivate failed!");
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
threadLocalInfo = newInfo.forget();
|
|
}
|
|
|
|
if (threadLocalInfo->mActor) {
|
|
return threadLocalInfo->mActor;
|
|
}
|
|
|
|
if (XRE_IsParentProcess()) {
|
|
RefPtr<ChildImpl> strongActor = ParentImpl::CreateActorForSameProcess();
|
|
if (NS_WARN_IF(!strongActor)) {
|
|
return nullptr;
|
|
}
|
|
|
|
RefPtr<ChildImpl>& actor = threadLocalInfo->mActor;
|
|
strongActor.swap(actor);
|
|
|
|
return actor;
|
|
}
|
|
|
|
RefPtr<ContentChild> content = ContentChild::GetSingleton();
|
|
MOZ_ASSERT(content);
|
|
|
|
if (content->IsShuttingDown()) {
|
|
// The transport for ContentChild is shut down and can't be used to open
|
|
// PBackground.
|
|
return nullptr;
|
|
}
|
|
|
|
Endpoint<PBackgroundParent> parent;
|
|
Endpoint<PBackgroundChild> child;
|
|
nsresult rv;
|
|
rv = PBackground::CreateEndpoints(content->OtherPid(),
|
|
base::GetCurrentProcId(),
|
|
&parent, &child);
|
|
if (NS_FAILED(rv)) {
|
|
MOZ_CRASH("Failed to create top level actor!");
|
|
return nullptr;
|
|
}
|
|
|
|
RefPtr<ChildImpl> strongActor = new ChildImpl();
|
|
|
|
if (!child.Bind(strongActor)) {
|
|
CRASH_IN_CHILD_PROCESS("Failed to bind ChildImpl!");
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
strongActor->SetActorAlive();
|
|
|
|
if (NS_IsMainThread()) {
|
|
if (!content->SendInitBackground(Move(parent))) {
|
|
MOZ_CRASH("Failed to create top level actor!");
|
|
return nullptr;
|
|
}
|
|
} else {
|
|
nsCOMPtr<nsIRunnable> runnable =
|
|
NewRunnableMethod<Endpoint<PBackgroundParent>&&>(
|
|
"dom::ContentChild::SendInitBackground",
|
|
content,
|
|
&ContentChild::SendInitBackground,
|
|
Move(parent));
|
|
MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(runnable));
|
|
}
|
|
|
|
RefPtr<ChildImpl>& actor = threadLocalInfo->mActor;
|
|
strongActor.swap(actor);
|
|
|
|
return actor;
|
|
}
|
|
|
|
// static
|
|
void
|
|
ChildImpl::CloseForCurrentThread()
|
|
{
|
|
MOZ_ASSERT(!NS_IsMainThread(),
|
|
"PBackground for the main thread should be shut down via ChildImpl::Shutdown().");
|
|
|
|
if (sThreadLocalIndex == kBadThreadLocalIndex) {
|
|
return;
|
|
}
|
|
|
|
auto threadLocalInfo =
|
|
static_cast<ThreadLocalInfo*>(PR_GetThreadPrivate(sThreadLocalIndex));
|
|
|
|
if (!threadLocalInfo) {
|
|
return;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
MOZ_ASSERT(!threadLocalInfo->mClosed);
|
|
threadLocalInfo->mClosed = true;
|
|
#endif
|
|
|
|
// Clearing the thread local will synchronously close the actor.
|
|
DebugOnly<PRStatus> status = PR_SetThreadPrivate(sThreadLocalIndex, nullptr);
|
|
MOZ_ASSERT(status == PR_SUCCESS);
|
|
}
|
|
|
|
// static
|
|
BackgroundChildImpl::ThreadLocal*
|
|
ChildImpl::GetThreadLocalForCurrentThread()
|
|
{
|
|
MOZ_ASSERT(sThreadLocalIndex != kBadThreadLocalIndex,
|
|
"BackgroundChild::Startup() was never called!");
|
|
|
|
auto threadLocalInfo = NS_IsMainThread() ? sMainThreadInfo :
|
|
static_cast<ThreadLocalInfo*>(PR_GetThreadPrivate(sThreadLocalIndex));
|
|
|
|
if (!threadLocalInfo) {
|
|
return nullptr;
|
|
}
|
|
|
|
if (!threadLocalInfo->mConsumerThreadLocal) {
|
|
threadLocalInfo->mConsumerThreadLocal =
|
|
new BackgroundChildImpl::ThreadLocal();
|
|
}
|
|
|
|
return threadLocalInfo->mConsumerThreadLocal;
|
|
}
|
|
|
|
void
|
|
ChildImpl::ActorDestroy(ActorDestroyReason aWhy)
|
|
{
|
|
AssertIsOnOwningThread();
|
|
|
|
#ifdef DEBUG
|
|
MOZ_ASSERT(!mActorDestroyed);
|
|
mActorDestroyed = true;
|
|
#endif
|
|
|
|
BackgroundChildImpl::ActorDestroy(aWhy);
|
|
}
|
|
|
|
NS_IMPL_ISUPPORTS(ChildImpl::ShutdownObserver, nsIObserver)
|
|
|
|
NS_IMETHODIMP
|
|
ChildImpl::ShutdownObserver::Observe(nsISupports* aSubject,
|
|
const char* aTopic,
|
|
const char16_t* aData)
|
|
{
|
|
AssertIsOnMainThread();
|
|
MOZ_ASSERT(!strcmp(aTopic, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID));
|
|
|
|
ChildImpl::Shutdown();
|
|
|
|
return NS_OK;
|
|
}
|