gfx/ipc/VsyncIOThreadHolder.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
   7 #include "VsyncIOThreadHolder.h"
   8
   9 #include "mozilla/SchedulerGroup.h"
  10
  11 namespace mozilla {
  12 namespace gfx {
  13
  14 VsyncIOThreadHolder::VsyncIOThreadHolder() {
  15   MOZ_COUNT_CTOR(VsyncIOThreadHolder);
  16 }
  17
  18 VsyncIOThreadHolder::~VsyncIOThreadHolder() {
  19   MOZ_COUNT_DTOR(VsyncIOThreadHolder);
  20
  21   if (!mThread) {
  22     return;
  23   }
  24
  25   if (NS_IsMainThread()) {
  26     mThread->AsyncShutdown();
  27   } else {
  28     SchedulerGroup::Dispatch(NewRunnableMethod(
  29         "nsIThread::AsyncShutdown", mThread, &nsIThread::AsyncShutdown));
  30   }
  31 }
  32
  33 bool VsyncIOThreadHolder::Start() {
  34   /* "VsyncIOThread" is used as the thread we send/recv IPC messages on.  We
  35    * don't use the "WindowsVsyncThread" directly because it isn't servicing an
  36    * nsThread event loop which is needed for IPC to return results/notify us
  37    * about shutdown etc.
  38    *
  39    * It would be better if we could notify the IPC IO thread directly to avoid
  40    * the extra ping-ponging but that doesn't seem possible. */
  41   nsresult rv = NS_NewNamedThread("VsyncIOThread", getter_AddRefs(mThread));
  42   return NS_SUCCEEDED(rv);
  43 }
  44
  45 RefPtr<nsIThread> VsyncIOThreadHolder::GetThread() const { return mThread; }
  46
  47 }  // namespace gfx
  48 }  // namespace mozilla