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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 "mozilla/mscom/EnsureMTA.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/mscom/Utils.h"
#include "mozilla/SchedulerGroup.h"
#include "mozilla/StaticLocalPtr.h"
#include "nsThreadUtils.h"
#include "private/pprthred.h"
namespace {
class EnterMTARunnable : public mozilla::Runnable {
public:
EnterMTARunnable() : mozilla::Runnable("EnterMTARunnable") {}
NS_IMETHOD Run() override {
mozilla::DebugOnly<HRESULT> hr =
::CoInitializeEx(nullptr, COINIT_MULTITHREADED);
MOZ_ASSERT(SUCCEEDED(hr));
return NS_OK;
}
};
class BackgroundMTAData {
public:
BackgroundMTAData() {
nsCOMPtr<nsIRunnable> runnable = new EnterMTARunnable();
mozilla::DebugOnly<nsresult> rv =
NS_NewNamedThread("COM MTA", getter_AddRefs(mThread), runnable);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "NS_NewNamedThread failed");
MOZ_ASSERT(NS_SUCCEEDED(rv));
}
~BackgroundMTAData() {
if (mThread) {
mThread->Dispatch(
NS_NewRunnableFunction("BackgroundMTAData::~BackgroundMTAData",
&::CoUninitialize),
NS_DISPATCH_NORMAL);
mThread->Shutdown();
}
}
nsCOMPtr<nsIThread> GetThread() const { return mThread; }
private:
nsCOMPtr<nsIThread> mThread;
};
} // anonymous namespace
namespace mozilla {
namespace mscom {
/* static */
RefPtr<EnsureMTA::CreateInstanceAgileRefPromise>
EnsureMTA::CreateInstanceInternal(REFCLSID aClsid, REFIID aIid) {
MOZ_ASSERT(IsCurrentThreadExplicitMTA());
RefPtr<IUnknown> iface;
HRESULT hr = ::CoCreateInstance(aClsid, nullptr, CLSCTX_INPROC_SERVER, aIid,
getter_AddRefs(iface));
if (FAILED(hr)) {
return CreateInstanceAgileRefPromise::CreateAndReject(hr, __func__);
}
// We need to use the two argument constructor for AgileReference because our
// RefPtr is not parameterized on the specific interface being requested.
AgileReference agileRef(aIid, iface);
if (!agileRef) {
return CreateInstanceAgileRefPromise::CreateAndReject(agileRef.GetHResult(),
__func__);
}
return CreateInstanceAgileRefPromise::CreateAndResolve(std::move(agileRef),
__func__);
}
/* static */
RefPtr<EnsureMTA::CreateInstanceAgileRefPromise> EnsureMTA::CreateInstance(
REFCLSID aClsid, REFIID aIid) {
MOZ_ASSERT(IsCOMInitializedOnCurrentThread());
const bool isClassOk = IsClassThreadAwareInprocServer(aClsid);
MOZ_ASSERT(isClassOk,
"mozilla::mscom::EnsureMTA::CreateInstance is not "
"safe/performant/necessary to use with this CLSID. This CLSID "
"either does not support creation from within a multithreaded "
"apartment, or it is not an in-process server.");
if (!isClassOk) {
return CreateInstanceAgileRefPromise::CreateAndReject(CO_E_NOT_SUPPORTED,
__func__);
}
if (IsCurrentThreadExplicitMTA()) {
// It's safe to immediately call CreateInstanceInternal
return CreateInstanceInternal(aClsid, aIid);
}
// aClsid and aIid are references. Make local copies that we can put into the
// lambda in case the sources of aClsid or aIid are not static data
CLSID localClsid = aClsid;
IID localIid = aIid;
auto invoker = [localClsid,
localIid]() -> RefPtr<CreateInstanceAgileRefPromise> {
return CreateInstanceInternal(localClsid, localIid);
};
nsCOMPtr<nsIThread> mtaThread(GetMTAThread());
return InvokeAsync(mtaThread->SerialEventTarget(), __func__,
std::move(invoker));
}
/* static */
nsCOMPtr<nsIThread> EnsureMTA::GetMTAThread() {
static StaticLocalAutoPtr<BackgroundMTAData> sMTAData(
[]() -> BackgroundMTAData* {
BackgroundMTAData* bgData = new BackgroundMTAData();
auto setClearOnShutdown = [ptr = &sMTAData]() -> void {
ClearOnShutdown(ptr, ShutdownPhase::ShutdownThreads);
};
if (NS_IsMainThread()) {
setClearOnShutdown();
return bgData;
}
SchedulerGroup::Dispatch(
TaskCategory::Other,
NS_NewRunnableFunction("mscom::EnsureMTA::GetMTAThread",
std::move(setClearOnShutdown)));
return bgData;
}());
MOZ_ASSERT(sMTAData);
return sMTAData->GetThread();
}
} // namespace mscom
} // namespace mozilla
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