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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 "RemoteWorkerService.h"
#include "mozilla/dom/PRemoteWorkerParent.h"
#include "mozilla/ipc/BackgroundChild.h"
#include "mozilla/ipc/BackgroundParent.h"
#include "mozilla/ipc/PBackgroundChild.h"
#include "mozilla/ipc/PBackgroundParent.h"
#include "mozilla/SchedulerGroup.h"
#include "mozilla/Services.h"
#include "mozilla/StaticMutex.h"
#include "mozilla/StaticPtr.h"
#include "nsIObserverService.h"
#include "nsIThread.h"
#include "nsThreadUtils.h"
#include "nsXPCOMPrivate.h"
#include "RemoteWorkerController.h"
#include "RemoteWorkerServiceChild.h"
#include "RemoteWorkerServiceParent.h"
namespace mozilla {
using namespace ipc;
namespace dom {
namespace {
StaticMutex sRemoteWorkerServiceMutex;
StaticRefPtr<RemoteWorkerService> sRemoteWorkerService;
} // namespace
/* static */
void RemoteWorkerService::Initialize() {
MOZ_ASSERT(NS_IsMainThread());
StaticMutexAutoLock lock(sRemoteWorkerServiceMutex);
MOZ_ASSERT(!sRemoteWorkerService);
RefPtr<RemoteWorkerService> service = new RemoteWorkerService();
if (!XRE_IsParentProcess()) {
nsresult rv = service->InitializeOnMainThread();
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
sRemoteWorkerService = service;
return;
}
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (NS_WARN_IF(!obs)) {
return;
}
nsresult rv = obs->AddObserver(service, "profile-after-change", false);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
sRemoteWorkerService = service;
}
/* static */
nsIThread* RemoteWorkerService::Thread() {
StaticMutexAutoLock lock(sRemoteWorkerServiceMutex);
MOZ_ASSERT(sRemoteWorkerService);
MOZ_ASSERT(sRemoteWorkerService->mThread);
return sRemoteWorkerService->mThread;
}
nsresult RemoteWorkerService::InitializeOnMainThread() {
// I would like to call this thread "DOM Remote Worker Launcher", but the max
// length is 16 chars.
nsresult rv = NS_NewNamedThread("Worker Launcher", getter_AddRefs(mThread));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (NS_WARN_IF(!obs)) {
return NS_ERROR_FAILURE;
}
rv = obs->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
RefPtr<RemoteWorkerService> self = this;
nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
"InitializeThread", [self]() { self->InitializeOnTargetThread(); });
rv = mThread->Dispatch(r.forget(), NS_DISPATCH_NORMAL);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
RemoteWorkerService::RemoteWorkerService() { MOZ_ASSERT(NS_IsMainThread()); }
RemoteWorkerService::~RemoteWorkerService() = default;
void RemoteWorkerService::InitializeOnTargetThread() {
MOZ_ASSERT(mThread);
MOZ_ASSERT(mThread->IsOnCurrentThread());
PBackgroundChild* actorChild = BackgroundChild::GetOrCreateForCurrentThread();
if (NS_WARN_IF(!actorChild)) {
return;
}
RemoteWorkerServiceChild* actor = static_cast<RemoteWorkerServiceChild*>(
actorChild->SendPRemoteWorkerServiceConstructor());
if (NS_WARN_IF(!actor)) {
return;
}
// Now we are ready!
mActor = actor;
}
void RemoteWorkerService::CloseActorOnTargetThread() {
MOZ_ASSERT(mThread);
MOZ_ASSERT(mThread->IsOnCurrentThread());
// If mActor is nullptr it means that initialization failed.
if (mActor) {
// Here we need to shutdown the IPC protocol.
mActor->Send__delete__(mActor);
mActor = nullptr;
}
}
NS_IMETHODIMP
RemoteWorkerService::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
MOZ_ASSERT(mThread);
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (obs) {
obs->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
}
RefPtr<RemoteWorkerService> self = this;
nsCOMPtr<nsIRunnable> r =
NS_NewRunnableFunction("RemoteWorkerService::CloseActorOnTargetThread",
[self]() { self->CloseActorOnTargetThread(); });
mThread->Dispatch(r.forget(), NS_DISPATCH_NORMAL);
// We've posted a shutdown message; now shutdown the thread. This will spin
// a nested event loop waiting for the thread to process all pending events
// (including the just dispatched CloseActorOnTargetThread which will close
// the actor), ensuring to block main thread shutdown long enough to avoid
// races.
mThread->Shutdown();
mThread = nullptr;
StaticMutexAutoLock lock(sRemoteWorkerServiceMutex);
sRemoteWorkerService = nullptr;
return NS_OK;
}
MOZ_ASSERT(!strcmp(aTopic, "profile-after-change"));
MOZ_ASSERT(XRE_IsParentProcess());
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (obs) {
obs->RemoveObserver(this, "profile-after-change");
}
return InitializeOnMainThread();
}
NS_IMPL_ISUPPORTS(RemoteWorkerService, nsIObserver)
} // namespace dom
} // namespace mozilla
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