зеркало из https://github.com/mozilla/gecko-dev.git
121 строка
4.1 KiB
C++
121 строка
4.1 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 "CanvasRenderThread.h"
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#include "mozilla/BackgroundHangMonitor.h"
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#include "transport/runnable_utils.h"
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namespace mozilla::gfx {
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static StaticRefPtr<CanvasRenderThread> sCanvasRenderThread;
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static mozilla::BackgroundHangMonitor* sBackgroundHangMonitor;
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#ifdef DEBUG
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static bool sCanvasRenderThreadEverStarted = false;
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#endif
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CanvasRenderThread::CanvasRenderThread(RefPtr<nsIThread> aThread)
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: mThread(std::move(aThread)) {}
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CanvasRenderThread::~CanvasRenderThread() {}
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// static
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CanvasRenderThread* CanvasRenderThread::Get() { return sCanvasRenderThread; }
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// static
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void CanvasRenderThread::Start() {
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(!sCanvasRenderThread);
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#ifdef DEBUG
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// Check to ensure nobody will try to ever start us more than once during
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// the process' lifetime (in particular after Stop).
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MOZ_ASSERT(!sCanvasRenderThreadEverStarted);
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sCanvasRenderThreadEverStarted = true;
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#endif
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// This is 4M, which is higher than the default 256K.
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// Increased with bug 1753349 to accommodate the `chromium/5359` branch of
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// ANGLE, which has large peak stack usage for some pathological shader
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// compilations.
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//
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// Previously increased to 512K to accommodate Mesa in bug 1753340.
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//
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// Previously increased to 320K to avoid a stack overflow in the
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// Intel Vulkan driver initialization in bug 1716120.
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//
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// Note: we only override it if it's limited already.
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const uint32_t stackSize =
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nsIThreadManager::DEFAULT_STACK_SIZE ? 4096 << 10 : 0;
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RefPtr<nsIThread> thread;
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nsresult rv = NS_NewNamedThread(
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"CanvasRenderer", getter_AddRefs(thread),
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NS_NewRunnableFunction(
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"CanvasRender::BackgroundHangSetup",
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[]() {
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sBackgroundHangMonitor = new mozilla::BackgroundHangMonitor(
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"CanvasRendererBHM",
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/* Timeout values are powers-of-two to enable us get better
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data. 128ms is chosen for transient hangs because 8Hz should
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be the minimally acceptable goal for Compositor
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responsiveness (normal goal is 60Hz). */
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128,
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/* 2048ms is chosen for permanent hangs because it's longer than
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* most Compositor hangs seen in the wild, but is short enough
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* to not miss getting native hang stacks. */
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2048);
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nsCOMPtr<nsIThread> thread = NS_GetCurrentThread();
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nsThread* nsthread = static_cast<nsThread*>(thread.get());
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nsthread->SetUseHangMonitor(true);
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nsthread->SetPriority(nsISupportsPriority::PRIORITY_HIGH);
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}),
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{.stackSize = stackSize});
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if (NS_FAILED(rv)) {
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return;
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}
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sCanvasRenderThread = new CanvasRenderThread(thread);
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}
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// static
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void CanvasRenderThread::ShutDown() {
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(sCanvasRenderThread);
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// Null out sCanvasRenderThread before we enter synchronous Shutdown,
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// from here on we are to be considered shut down for our consumers.
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nsCOMPtr<nsIThread> oldThread = sCanvasRenderThread->GetCanvasRenderThread();
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sCanvasRenderThread = nullptr;
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// We do a synchronous shutdown here while spinning the MT event loop.
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MOZ_ASSERT(oldThread);
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oldThread->Shutdown();
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}
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// static
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bool CanvasRenderThread::IsInCanvasRenderThread() {
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return sCanvasRenderThread &&
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sCanvasRenderThread->mThread == NS_GetCurrentThread();
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}
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// static
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already_AddRefed<nsIThread> CanvasRenderThread::GetCanvasRenderThread() {
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nsCOMPtr<nsIThread> thread;
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if (sCanvasRenderThread) {
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thread = sCanvasRenderThread->mThread;
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}
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return thread.forget();
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}
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void CanvasRenderThread::PostRunnable(already_AddRefed<nsIRunnable> aRunnable) {
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nsCOMPtr<nsIRunnable> runnable = aRunnable;
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mThread->Dispatch(runnable.forget());
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}
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} // namespace mozilla::gfx
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