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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 "RemoteLazyInputStreamThread.h"
#include "mozilla/SchedulerGroup.h"
#include "mozilla/StaticMutex.h"
#include "mozilla/TaskCategory.h"
#include "mozilla/ipc/BackgroundChild.h"
#include "mozilla/ipc/PBackgroundChild.h"
#include "nsXPCOMPrivate.h"
using namespace mozilla::ipc;
namespace mozilla {
namespace {
StaticMutex gRemoteLazyThreadMutex;
StaticRefPtr<RemoteLazyInputStreamThread> gRemoteLazyThread;
bool gShutdownHasStarted = false;
class ThreadInitializeRunnable final : public Runnable {
public:
ThreadInitializeRunnable() : Runnable("dom::ThreadInitializeRunnable") {}
NS_IMETHOD
Run() override {
StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
MOZ_ASSERT(gRemoteLazyThread);
gRemoteLazyThread->InitializeOnMainThread();
return NS_OK;
}
};
class MigrateActorRunnable final : public Runnable {
public:
explicit MigrateActorRunnable(RemoteLazyInputStreamChild* aActor)
: Runnable("dom::MigrateActorRunnable"), mActor(aActor) {
MOZ_ASSERT(mActor);
}
NS_IMETHOD
Run() override {
MOZ_ASSERT(mActor->State() ==
RemoteLazyInputStreamChild::eInactiveMigrating);
PBackgroundChild* actorChild =
BackgroundChild::GetOrCreateForCurrentThread();
if (!actorChild) {
return NS_OK;
}
if (actorChild->SendPRemoteLazyInputStreamConstructor(mActor, mActor->ID(),
mActor->Size())) {
mActor->Migrated();
}
return NS_OK;
}
private:
~MigrateActorRunnable() = default;
RefPtr<RemoteLazyInputStreamChild> mActor;
};
} // namespace
NS_IMPL_ISUPPORTS(RemoteLazyInputStreamThread, nsIObserver, nsIEventTarget)
/* static */
bool RemoteLazyInputStreamThread::IsOnFileEventTarget(
nsIEventTarget* aEventTarget) {
MOZ_ASSERT(aEventTarget);
// Note that we don't migrate actors when we are on the socket process
// because, on that process, we don't have complex life-time contexts such
// as workers and documents.
if (XRE_IsSocketProcess()) {
return true;
}
StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
return gRemoteLazyThread && aEventTarget == gRemoteLazyThread->mThread;
}
/* static */
RemoteLazyInputStreamThread* RemoteLazyInputStreamThread::Get() {
StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
if (gShutdownHasStarted) {
return nullptr;
}
return gRemoteLazyThread;
}
/* static */
RemoteLazyInputStreamThread* RemoteLazyInputStreamThread::GetOrCreate() {
StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
if (gShutdownHasStarted) {
return nullptr;
}
if (!gRemoteLazyThread) {
gRemoteLazyThread = new RemoteLazyInputStreamThread();
if (!gRemoteLazyThread->Initialize()) {
return nullptr;
}
}
return gRemoteLazyThread;
}
bool RemoteLazyInputStreamThread::Initialize() {
nsCOMPtr<nsIThread> thread;
nsresult rv = NS_NewNamedThread("RemoteLzyStream", getter_AddRefs(thread));
if (NS_WARN_IF(NS_FAILED(rv))) {
return false;
}
mThread = thread;
if (!mPendingActors.IsEmpty()) {
for (uint32_t i = 0; i < mPendingActors.Length(); ++i) {
MigrateActorInternal(mPendingActors[i]);
}
mPendingActors.Clear();
}
if (!NS_IsMainThread()) {
RefPtr<Runnable> runnable = new ThreadInitializeRunnable();
SchedulerGroup::Dispatch(TaskCategory::Other, runnable.forget());
return true;
}
InitializeOnMainThread();
return true;
}
void RemoteLazyInputStreamThread::InitializeOnMainThread() {
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (NS_WARN_IF(!obs)) {
return;
}
nsresult rv =
obs->AddObserver(this, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID, false);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
}
NS_IMETHODIMP
RemoteLazyInputStreamThread::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
MOZ_ASSERT(!strcmp(aTopic, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID));
StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
if (mThread) {
mThread->Shutdown();
mThread = nullptr;
}
gShutdownHasStarted = true;
gRemoteLazyThread = nullptr;
return NS_OK;
}
void RemoteLazyInputStreamThread::MigrateActor(
RemoteLazyInputStreamChild* aActor) {
MOZ_ASSERT(aActor->State() == RemoteLazyInputStreamChild::eInactiveMigrating);
StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
if (gShutdownHasStarted) {
return;
}
if (!mThread) {
// The thread is not initialized yet.
mPendingActors.AppendElement(aActor);
return;
}
MigrateActorInternal(aActor);
}
void RemoteLazyInputStreamThread::MigrateActorInternal(
RemoteLazyInputStreamChild* aActor) {
RefPtr<Runnable> runnable = new MigrateActorRunnable(aActor);
mThread->Dispatch(runnable, NS_DISPATCH_NORMAL);
}
// nsIEventTarget
NS_IMETHODIMP_(bool)
RemoteLazyInputStreamThread::IsOnCurrentThreadInfallible() {
return mThread->IsOnCurrentThread();
}
NS_IMETHODIMP
RemoteLazyInputStreamThread::IsOnCurrentThread(bool* aRetval) {
return mThread->IsOnCurrentThread(aRetval);
}
NS_IMETHODIMP
RemoteLazyInputStreamThread::Dispatch(already_AddRefed<nsIRunnable> aRunnable,
uint32_t aFlags) {
nsCOMPtr<nsIRunnable> runnable(aRunnable);
StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
if (gShutdownHasStarted) {
return NS_ERROR_NOT_INITIALIZED;
}
return mThread->Dispatch(runnable.forget(), aFlags);
}
NS_IMETHODIMP
RemoteLazyInputStreamThread::DispatchFromScript(nsIRunnable* aRunnable,
uint32_t aFlags) {
nsCOMPtr<nsIRunnable> runnable(aRunnable);
return Dispatch(runnable.forget(), aFlags);
}
NS_IMETHODIMP
RemoteLazyInputStreamThread::DelayedDispatch(already_AddRefed<nsIRunnable>,
uint32_t) {
return NS_ERROR_NOT_IMPLEMENTED;
}
bool IsOnDOMFileThread() {
StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
MOZ_ASSERT(!gShutdownHasStarted);
MOZ_ASSERT(gRemoteLazyThread);
return gRemoteLazyThread->IsOnCurrentThreadInfallible();
}
void AssertIsOnDOMFileThread() { MOZ_ASSERT(IsOnDOMFileThread()); }
} // namespace mozilla
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