forked from mirrors/gecko-dev
3ab0c4aca3
We currently allow the content process to shutdown the IPDL objects on behalf the parent, and we wait for all of these instances to be freed before we complete shutdown. This is undesirable because it requires the parent to trust the child rather than the other way around; the child can hold shutdown hostage by simply not releasing its instances. The child should already support the parent closing its graphics IPDL objects because the GPU process itself can die abruptly and be restored at a later time.
154 lines
4.4 KiB
C++
154 lines
4.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set sw=2 sts=2 ts=8 et tw=99 : */
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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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#include "CompositorThread.h"
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#include "MainThreadUtils.h"
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#include "nsThreadUtils.h"
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#include "CompositorBridgeParent.h"
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#include "mozilla/layers/ImageBridgeParent.h"
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#include "mozilla/media/MediaSystemResourceService.h"
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namespace mozilla {
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namespace gfx {
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// See VRManagerChild.cpp
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void ReleaseVRManagerParentSingleton();
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} // namespace gfx
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namespace layers {
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static StaticRefPtr<CompositorThreadHolder> sCompositorThreadHolder;
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static bool sFinishedCompositorShutDown = false;
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CompositorThreadHolder* GetCompositorThreadHolder()
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{
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return sCompositorThreadHolder;
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}
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base::Thread*
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CompositorThread()
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{
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return sCompositorThreadHolder
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? sCompositorThreadHolder->GetCompositorThread()
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: nullptr;
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}
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/* static */ MessageLoop*
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CompositorThreadHolder::Loop()
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{
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return CompositorThread() ? CompositorThread()->message_loop() : nullptr;
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}
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CompositorThreadHolder*
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CompositorThreadHolder::GetSingleton()
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{
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return sCompositorThreadHolder;
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}
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CompositorThreadHolder::CompositorThreadHolder()
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: mCompositorThread(CreateCompositorThread())
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{
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MOZ_ASSERT(NS_IsMainThread());
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}
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CompositorThreadHolder::~CompositorThreadHolder()
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{
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MOZ_ASSERT(NS_IsMainThread());
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DestroyCompositorThread(mCompositorThread);
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}
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/* static */ void
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CompositorThreadHolder::DestroyCompositorThread(base::Thread* aCompositorThread)
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{
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(!sCompositorThreadHolder, "We shouldn't be destroying the compositor thread yet.");
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CompositorBridgeParent::Shutdown();
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delete aCompositorThread;
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sFinishedCompositorShutDown = true;
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}
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/* static */ base::Thread*
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CompositorThreadHolder::CreateCompositorThread()
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{
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(!sCompositorThreadHolder, "The compositor thread has already been started!");
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base::Thread* compositorThread = new base::Thread("Compositor");
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base::Thread::Options options;
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/* Timeout values are powers-of-two to enable us get better data.
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128ms is chosen for transient hangs because 8Hz should be the minimally
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acceptable goal for Compositor responsiveness (normal goal is 60Hz). */
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options.transient_hang_timeout = 128; // milliseconds
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/* 2048ms is chosen for permanent hangs because it's longer than most
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* Compositor hangs seen in the wild, but is short enough to not miss getting
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* native hang stacks. */
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options.permanent_hang_timeout = 2048; // milliseconds
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#if defined(_WIN32)
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/* With d3d9 the compositor thread creates native ui, see DeviceManagerD3D9. As
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* such the thread is a gui thread, and must process a windows message queue or
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* risk deadlocks. Chromium message loop TYPE_UI does exactly what we need. */
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options.message_loop_type = MessageLoop::TYPE_UI;
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#endif
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if (!compositorThread->StartWithOptions(options)) {
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delete compositorThread;
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return nullptr;
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}
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CompositorBridgeParent::Setup();
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ImageBridgeParent::Setup();
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return compositorThread;
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}
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void
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CompositorThreadHolder::Start()
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{
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MOZ_ASSERT(NS_IsMainThread(), "Should be on the main Thread!");
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MOZ_ASSERT(!sCompositorThreadHolder, "The compositor thread has already been started!");
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sCompositorThreadHolder = new CompositorThreadHolder();
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}
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void
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CompositorThreadHolder::Shutdown()
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{
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MOZ_ASSERT(NS_IsMainThread(), "Should be on the main Thread!");
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MOZ_ASSERT(sCompositorThreadHolder, "The compositor thread has already been shut down!");
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ImageBridgeParent::Shutdown();
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gfx::ReleaseVRManagerParentSingleton();
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MediaSystemResourceService::Shutdown();
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CompositorManagerParent::Shutdown();
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sCompositorThreadHolder = nullptr;
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// No locking is needed around sFinishedCompositorShutDown because it is only
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// ever accessed on the main thread.
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SpinEventLoopUntil([&]() { return sFinishedCompositorShutDown; });
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CompositorBridgeParent::FinishShutdown();
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}
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/* static */ bool
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CompositorThreadHolder::IsInCompositorThread()
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{
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return CompositorThread() &&
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CompositorThread()->thread_id() == PlatformThread::CurrentId();
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}
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} // namespace mozilla
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} // namespace layers
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bool
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NS_IsInCompositorThread()
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{
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return mozilla::layers::CompositorThreadHolder::IsInCompositorThread();
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}
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