gfx/ipc/VsyncBridgeChild.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6 #include "VsyncBridgeChild.h"
   7 #include "VsyncIOThreadHolder.h"
   8 #include "mozilla/dom/ContentChild.h"
   9 #include "mozilla/gfx/GPUProcessManager.h"
  10 #include "mozilla/ipc/Endpoint.h"
  11
  12 namespace mozilla {
  13 namespace gfx {
  14
  15 VsyncBridgeChild::VsyncBridgeChild(RefPtr<VsyncIOThreadHolder> aThread,
  16                                    const uint64_t& aProcessToken)
  17     : mThread(aThread), mProcessToken(aProcessToken) {}
  18
  19 VsyncBridgeChild::~VsyncBridgeChild() = default;
  20
  21 /* static */
  22 RefPtr<VsyncBridgeChild> VsyncBridgeChild::Create(
  23     RefPtr<VsyncIOThreadHolder> aThread, const uint64_t& aProcessToken,
  24     Endpoint<PVsyncBridgeChild>&& aEndpoint) {
  25   RefPtr<VsyncBridgeChild> child = new VsyncBridgeChild(aThread, aProcessToken);
  26
  27   RefPtr<nsIRunnable> task = NewRunnableMethod<Endpoint<PVsyncBridgeChild>&&>(
  28       "gfx::VsyncBridgeChild::Open", child, &VsyncBridgeChild::Open,
  29       std::move(aEndpoint));
  30   aThread->GetThread()->Dispatch(task.forget(), nsIThread::DISPATCH_NORMAL);
  31
  32   return child;
  33 }
  34
  35 void VsyncBridgeChild::Open(Endpoint<PVsyncBridgeChild>&& aEndpoint) {
  36   if (!aEndpoint.Bind(this)) {
  37     // The GPU Process Manager might be gone if we receive ActorDestroy very
  38     // late in shutdown.
  39     if (GPUProcessManager* gpm = GPUProcessManager::Get())
  40       gpm->NotifyRemoteActorDestroyed(mProcessToken);
  41     return;
  42   }
  43
  44   // Last reference is freed in DeallocPVsyncBridgeChild.
  45   AddRef();
  46 }
  47
  48 class NotifyVsyncTask : public Runnable {
  49  public:
  50   NotifyVsyncTask(RefPtr<VsyncBridgeChild> aVsyncBridge,
  51                   const VsyncEvent& aVsync, const layers::LayersId& aLayersId)
  52       : Runnable("gfx::NotifyVsyncTask"),
  53         mVsyncBridge(aVsyncBridge),
  54         mVsync(aVsync),
  55         mLayersId(aLayersId) {}
  56
  57   NS_IMETHOD Run() override {
  58     mVsyncBridge->NotifyVsyncImpl(mVsync, mLayersId);
  59     return NS_OK;
  60   }
  61
  62  private:
  63   RefPtr<VsyncBridgeChild> mVsyncBridge;
  64   VsyncEvent mVsync;
  65   layers::LayersId mLayersId;
  66 };
  67
  68 bool VsyncBridgeChild::IsOnVsyncIOThread() const {
  69   return mThread->IsOnCurrentThread();
  70 }
  71
  72 void VsyncBridgeChild::NotifyVsync(const VsyncEvent& aVsync,
  73                                    const layers::LayersId& aLayersId) {
  74   // This should be on the Vsync thread (not the Vsync I/O thread).
  75   MOZ_ASSERT(!IsOnVsyncIOThread());
  76
  77   RefPtr<NotifyVsyncTask> task = new NotifyVsyncTask(this, aVsync, aLayersId);
  78   mThread->Dispatch(task.forget());
  79 }
  80
  81 void VsyncBridgeChild::NotifyVsyncImpl(const VsyncEvent& aVsync,
  82                                        const layers::LayersId& aLayersId) {
  83   // This should be on the Vsync I/O thread.
  84   MOZ_ASSERT(IsOnVsyncIOThread());
  85
  86   if (!mProcessToken) {
  87     return;
  88   }
  89   SendNotifyVsync(aVsync, aLayersId);
  90 }
  91
  92 void VsyncBridgeChild::Close() {
  93   if (!IsOnVsyncIOThread()) {
  94     mThread->Dispatch(NewRunnableMethod("gfx::VsyncBridgeChild::Close", this,
  95                                         &VsyncBridgeChild::Close));
  96     return;
  97   }
  98
  99   // We clear mProcessToken when the channel is closed.
 100   if (!mProcessToken) {
 101     return;
 102   }
 103
 104   // Clear the process token so we don't notify the GPUProcessManager. It
 105   // already knows we're closed since it manually called Close, and in fact the
 106   // GPM could have already been destroyed during shutdown.
 107   mProcessToken = 0;
 108
 109   // Close the underlying IPC channel.
 110   PVsyncBridgeChild::Close();
 111 }
 112
 113 void VsyncBridgeChild::ActorDestroy(ActorDestroyReason aWhy) {
 114   if (mProcessToken) {
 115     GPUProcessManager::Get()->NotifyRemoteActorDestroyed(mProcessToken);
 116     mProcessToken = 0;
 117   }
 118 }
 119
 120 void VsyncBridgeChild::ActorDealloc() { Release(); }
 121
 122 void VsyncBridgeChild::ProcessingError(Result aCode, const char* aReason) {
 123   MOZ_RELEASE_ASSERT(aCode == MsgDropped,
 124                      "Processing error in VsyncBridgeChild");
 125 }
 126
 127 void VsyncBridgeChild::HandleFatalError(const char* aMsg) const {
 128   dom::ContentChild::FatalErrorIfNotUsingGPUProcess(aMsg, OtherPid());
 129 }
 130
 131 }  // namespace gfx
 132 }  // namespace mozilla