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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 "ErrorList.h"
#include "mozilla/AppShutdown.h"
#include "mozilla/SchedulerGroup.h"
#include "mozilla/StaticMutex.h"
#include "mozilla/StaticPtr.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
MOZ_GUARDED_BY(gRemoteLazyThreadMutex);
} // namespace
NS_IMPL_ISUPPORTS(RemoteLazyInputStreamThread, nsIEventTarget,
nsISerialEventTarget, nsIDirectTaskDispatcher)
/* static */
already_AddRefed<RemoteLazyInputStreamThread>
RemoteLazyInputStreamThread::Get() {
StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
return do_AddRef(gRemoteLazyThread);
}
/* static */
already_AddRefed<RemoteLazyInputStreamThread>
RemoteLazyInputStreamThread::GetOrCreate() {
StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
if (AppShutdown::IsInOrBeyond(ShutdownPhase::XPCOMShutdownThreads)) {
return nullptr;
}
if (!gRemoteLazyThread) {
nsCOMPtr<nsIThread> thread;
nsresult rv = NS_NewNamedThread("RemoteLzyStream", getter_AddRefs(thread));
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
gRemoteLazyThread =
new RemoteLazyInputStreamThread(WrapMovingNotNull(thread));
// Dispatch to the main thread, which will set up a listener
// to shut down the thread during XPCOMShutdownThreads.
//
// We do this even if we're already on the main thread, as
// if we're too late in shutdown, this will trigger the thread
// to shut down synchronously.
NS_DispatchToMainThread(NS_NewRunnableFunction(
"RemoteLazyInputStreamThread::MainThreadInit", [] {
RunOnShutdown(
[] {
RefPtr<RemoteLazyInputStreamThread> rlis =
RemoteLazyInputStreamThread::Get();
// This is the only place supposed to ever null our reference.
MOZ_ASSERT(rlis);
rlis->mThread->Shutdown();
StaticMutexAutoLock lock(gRemoteLazyThreadMutex);
gRemoteLazyThread = nullptr;
},
ShutdownPhase::XPCOMShutdownThreads);
}));
}
return do_AddRef(gRemoteLazyThread);
}
// 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,
DispatchFlags aFlags) {
return mThread->Dispatch(std::move(aRunnable), aFlags);
}
NS_IMETHODIMP
RemoteLazyInputStreamThread::DispatchFromScript(nsIRunnable* aRunnable,
DispatchFlags aFlags) {
return mThread->Dispatch(do_AddRef(aRunnable), aFlags);
}
NS_IMETHODIMP
RemoteLazyInputStreamThread::DelayedDispatch(already_AddRefed<nsIRunnable>,
uint32_t) {
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
RemoteLazyInputStreamThread::RegisterShutdownTask(
nsITargetShutdownTask* aTask) {
return mThread->RegisterShutdownTask(aTask);
}
NS_IMETHODIMP
RemoteLazyInputStreamThread::UnregisterShutdownTask(
nsITargetShutdownTask* aTask) {
return mThread->UnregisterShutdownTask(aTask);
}
NS_IMETHODIMP
RemoteLazyInputStreamThread::DispatchDirectTask(
already_AddRefed<nsIRunnable> aRunnable) {
nsCOMPtr<nsIRunnable> runnable(aRunnable);
nsCOMPtr<nsIDirectTaskDispatcher> dispatcher = do_QueryInterface(mThread);
if (dispatcher) {
return dispatcher->DispatchDirectTask(runnable.forget());
}
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP RemoteLazyInputStreamThread::DrainDirectTasks() {
nsCOMPtr<nsIDirectTaskDispatcher> dispatcher = do_QueryInterface(mThread);
if (dispatcher) {
return dispatcher->DrainDirectTasks();
}
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP RemoteLazyInputStreamThread::HaveDirectTasks(bool* aValue) {
nsCOMPtr<nsIDirectTaskDispatcher> dispatcher = do_QueryInterface(mThread);
if (dispatcher) {
return dispatcher->HaveDirectTasks(aValue);
}
return NS_ERROR_FAILURE;
}
bool IsOnDOMFileThread() {
RefPtr<RemoteLazyInputStreamThread> rlis = RemoteLazyInputStreamThread::Get();
return rlis && rlis->IsOnCurrentThread();
}
void AssertIsOnDOMFileThread() { MOZ_ASSERT(IsOnDOMFileThread()); }
} // namespace mozilla
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