260ebb1412
In future parts, TaskQueue will require extra initialization to be performed which cannot happen in a constructor, as it takes references to the TaskQueue object itself, which will require the introduction of a helper method. This patch switches all callers of the TaskQueue constructor to use the new method. Differential Revision: https://phabricator.services.mozilla.com/D142604
139 lines
5.0 KiB
C++
139 lines
5.0 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "CanvasThread.h"
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#include "mozilla/SharedThreadPool.h"
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#include "nsThreadUtils.h"
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#include "prsystem.h"
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bool NS_IsInCanvasThreadOrWorker() {
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return mozilla::layers::CanvasThreadHolder::IsInCanvasThreadOrWorker();
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}
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namespace mozilla {
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namespace layers {
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StaticDataMutex<StaticRefPtr<CanvasThreadHolder>>
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CanvasThreadHolder::sCanvasThreadHolder("sCanvasThreadHolder");
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CanvasThreadHolder::CanvasThreadHolder(
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already_AddRefed<nsISerialEventTarget> aCanvasThread,
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already_AddRefed<nsIThreadPool> aCanvasWorkers)
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: mCanvasThread(aCanvasThread),
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mCanvasWorkers(aCanvasWorkers),
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mCompositorThreadKeepAlive(CompositorThreadHolder::GetSingleton()) {
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MOZ_ASSERT(NS_IsInCompositorThread());
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MOZ_ASSERT(mCanvasThread);
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MOZ_ASSERT(mCanvasWorkers);
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}
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CanvasThreadHolder::~CanvasThreadHolder() {
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// Note we can't just use NS_IsInCompositorThread() here because
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// sCompositorThreadHolder might have already gone.
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MOZ_ASSERT(
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mCompositorThreadKeepAlive->GetCompositorThread()->IsOnCurrentThread());
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}
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/* static */
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already_AddRefed<CanvasThreadHolder> CanvasThreadHolder::EnsureCanvasThread() {
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MOZ_ASSERT(NS_IsInCompositorThread());
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auto lockedCanvasThreadHolder = sCanvasThreadHolder.Lock();
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if (!lockedCanvasThreadHolder.ref()) {
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nsCOMPtr<nsISerialEventTarget> canvasThread;
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nsresult rv =
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NS_CreateBackgroundTaskQueue("Canvas", getter_AddRefs(canvasThread));
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NS_ENSURE_SUCCESS(rv, nullptr);
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// Given that the canvas workers are receiving instructions from
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// content processes, it probably doesn't make sense to have more than
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// half the number of processors doing canvas drawing. We set the
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// lower limit to 2, so that even on single processor systems, if
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// there is more than one window with canvas drawing, the OS can
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// manage the load between them.
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uint32_t threadLimit = std::max(2, PR_GetNumberOfProcessors() / 2);
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nsCOMPtr<nsIThreadPool> canvasWorkers =
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SharedThreadPool::Get("CanvasWorkers"_ns, threadLimit);
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if (!canvasWorkers) {
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return nullptr;
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}
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lockedCanvasThreadHolder.ref() =
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new CanvasThreadHolder(canvasThread.forget(), canvasWorkers.forget());
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}
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return do_AddRef(lockedCanvasThreadHolder.ref());
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}
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/* static */
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void CanvasThreadHolder::ReleaseOnCompositorThread(
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already_AddRefed<CanvasThreadHolder> aCanvasThreadHolder) {
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RefPtr<CanvasThreadHolder> canvasThreadHolder = aCanvasThreadHolder;
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auto lockedCanvasThreadHolder = sCanvasThreadHolder.Lock();
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lockedCanvasThreadHolder.ref()
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->mCompositorThreadKeepAlive->GetCompositorThread()
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->Dispatch(NS_NewRunnableFunction(
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"CanvasThreadHolder::StaticRelease",
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[canvasThreadHolder = std::move(canvasThreadHolder)]() mutable {
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RefPtr<CanvasThreadHolder> threadHolder =
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canvasThreadHolder.forget();
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threadHolder = nullptr;
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auto lockedCanvasThreadHolder = sCanvasThreadHolder.Lock();
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if (lockedCanvasThreadHolder.ref()->mRefCnt == 1) {
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lockedCanvasThreadHolder.ref() = nullptr;
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}
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}));
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}
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/* static */
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bool CanvasThreadHolder::IsInCanvasThread() {
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auto lockedCanvasThreadHolder = sCanvasThreadHolder.Lock();
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return lockedCanvasThreadHolder.ref() &&
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lockedCanvasThreadHolder.ref()->mCanvasThread->IsOnCurrentThread();
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}
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/* static */
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bool CanvasThreadHolder::IsInCanvasWorker() {
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auto lockedCanvasThreadHolder = sCanvasThreadHolder.Lock();
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return lockedCanvasThreadHolder.ref() &&
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lockedCanvasThreadHolder.ref()->mCanvasWorkers->IsOnCurrentThread();
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}
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/* static */
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bool CanvasThreadHolder::IsInCanvasThreadOrWorker() {
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auto lockedCanvasThreadHolder = sCanvasThreadHolder.Lock();
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return lockedCanvasThreadHolder.ref() &&
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(lockedCanvasThreadHolder.ref()->mCanvasWorkers->IsOnCurrentThread() ||
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lockedCanvasThreadHolder.ref()->mCanvasThread->IsOnCurrentThread());
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}
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/* static */
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void CanvasThreadHolder::MaybeDispatchToCanvasThread(
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already_AddRefed<nsIRunnable> aRunnable) {
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auto lockedCanvasThreadHolder = sCanvasThreadHolder.Lock();
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if (!lockedCanvasThreadHolder.ref()) {
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// There is no canvas thread just release the runnable.
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nsCOMPtr<nsIRunnable> runnable = aRunnable;
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return;
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}
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lockedCanvasThreadHolder.ref()->mCanvasThread->Dispatch(std::move(aRunnable));
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}
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void CanvasThreadHolder::DispatchToCanvasThread(
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already_AddRefed<nsIRunnable> aRunnable) {
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mCanvasThread->Dispatch(std::move(aRunnable));
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}
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already_AddRefed<TaskQueue> CanvasThreadHolder::CreateWorkerTaskQueue() {
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return TaskQueue::Create(do_AddRef(mCanvasWorkers), "CanvasWorker").forget();
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}
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} // namespace layers
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} // namespace mozilla
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