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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "CanvasRenderThread.h"
#include "mozilla/BackgroundHangMonitor.h"
#include "transport/runnable_utils.h"
namespace mozilla::gfx {
static StaticRefPtr<CanvasRenderThread> sCanvasRenderThread;
static mozilla::BackgroundHangMonitor* sBackgroundHangMonitor;
#ifdef DEBUG
static bool sCanvasRenderThreadEverStarted = false;
#endif
CanvasRenderThread::CanvasRenderThread(RefPtr<nsIThread> aThread)
: mThread(std::move(aThread)) {}
CanvasRenderThread::~CanvasRenderThread() {}
// static
CanvasRenderThread* CanvasRenderThread::Get() { return sCanvasRenderThread; }
// static
void CanvasRenderThread::Start() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!sCanvasRenderThread);
#ifdef DEBUG
// Check to ensure nobody will try to ever start us more than once during
// the process' lifetime (in particular after Stop).
MOZ_ASSERT(!sCanvasRenderThreadEverStarted);
sCanvasRenderThreadEverStarted = true;
#endif
// This is 4M, which is higher than the default 256K.
// Increased with bug 1753349 to accommodate the `chromium/5359` branch of
// ANGLE, which has large peak stack usage for some pathological shader
// compilations.
//
// Previously increased to 512K to accommodate Mesa in bug 1753340.
//
// Previously increased to 320K to avoid a stack overflow in the
// Intel Vulkan driver initialization in bug 1716120.
//
// Note: we only override it if it's limited already.
const uint32_t stackSize =
nsIThreadManager::DEFAULT_STACK_SIZE ? 4096 << 10 : 0;
RefPtr<nsIThread> thread;
nsresult rv = NS_NewNamedThread(
"CanvasRenderer", getter_AddRefs(thread),
NS_NewRunnableFunction(
"CanvasRender::BackgroundHangSetup",
[]() {
sBackgroundHangMonitor = new mozilla::BackgroundHangMonitor(
"CanvasRendererBHM",
/* Timeout values are powers-of-two to enable us get better
data. 128ms is chosen for transient hangs because 8Hz should
be the minimally acceptable goal for Compositor
responsiveness (normal goal is 60Hz). */
128,
/* 2048ms is chosen for permanent hangs because it's longer than
* most Compositor hangs seen in the wild, but is short enough
* to not miss getting native hang stacks. */
2048);
nsCOMPtr<nsIThread> thread = NS_GetCurrentThread();
nsThread* nsthread = static_cast<nsThread*>(thread.get());
nsthread->SetUseHangMonitor(true);
nsthread->SetPriority(nsISupportsPriority::PRIORITY_HIGH);
}),
{.stackSize = stackSize});
if (NS_FAILED(rv)) {
return;
}
sCanvasRenderThread = new CanvasRenderThread(thread);
}
// static
void CanvasRenderThread::ShutDown() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(sCanvasRenderThread);
// Null out sCanvasRenderThread before we enter synchronous Shutdown,
// from here on we are to be considered shut down for our consumers.
nsCOMPtr<nsIThread> oldThread = sCanvasRenderThread->GetCanvasRenderThread();
sCanvasRenderThread = nullptr;
// We do a synchronous shutdown here while spinning the MT event loop.
MOZ_ASSERT(oldThread);
oldThread->Shutdown();
}
// static
bool CanvasRenderThread::IsInCanvasRenderThread() {
return sCanvasRenderThread &&
sCanvasRenderThread->mThread == NS_GetCurrentThread();
}
// static
already_AddRefed<nsIThread> CanvasRenderThread::GetCanvasRenderThread() {
nsCOMPtr<nsIThread> thread;
if (sCanvasRenderThread) {
thread = sCanvasRenderThread->mThread;
}
return thread.forget();
}
void CanvasRenderThread::PostRunnable(already_AddRefed<nsIRunnable> aRunnable) {
nsCOMPtr<nsIRunnable> runnable = aRunnable;
mThread->Dispatch(runnable.forget());
}
} // namespace mozilla::gfx
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