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34dcc7b852
This change avoids lots of false positives for Coverity's CHECKED_RETURN warning, caused by NS_WARN_IF's current use in both statement-style and expression-style. In the case where the code within the NS_WARN_IF has side-effects, I made the following change. > NS_WARN_IF(NS_FAILED(FunctionWithSideEffects())); > --> > Unused << NS_WARN_IF(NS_FAILED(FunctionWithSideEffects())); In the case where the code within the NS_WARN_IF lacks side-effects, I made the following change. > NS_WARN_IF(!condWithoutSideEffects); > --> > NS_WARNING_ASSERTION(condWithoutSideEffects, "msg"); This has two improvements. - The condition is not evaluated in non-debug builds. - The sense of the condition is inverted to the familiar "this condition should be true" sense used in assertions. A common variation on the side-effect-free case is the following. > nsresult rv = Fn(); > NS_WARN_IF_(NS_FAILED(rv)); > --> > DebugOnly<nsresult rv> = Fn(); > NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Fn failed"); --HG-- extra : rebase_source : 58788245021096efa8372a9dc1d597a611d45611
79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/mscom/EnsureMTA.h"
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#include "mozilla/ClearOnShutdown.h"
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#include "mozilla/StaticPtr.h"
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#include "nsThreadUtils.h"
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#include "private/pprthred.h"
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namespace {
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class EnterMTARunnable : public mozilla::Runnable
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{
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public:
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NS_IMETHOD Run() override
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{
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mozilla::DebugOnly<HRESULT> hr = ::CoInitializeEx(nullptr,
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COINIT_MULTITHREADED);
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MOZ_ASSERT(SUCCEEDED(hr));
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return NS_OK;
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}
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};
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class BackgroundMTAData
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{
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public:
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BackgroundMTAData()
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{
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nsCOMPtr<nsIRunnable> runnable = new EnterMTARunnable();
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nsresult rv = NS_NewNamedThread("COM MTA",
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getter_AddRefs(mThread), runnable);
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NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "NS_NewNamedThread failed");
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MOZ_ASSERT(NS_SUCCEEDED(rv));
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}
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~BackgroundMTAData()
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{
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if (mThread) {
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mThread->Dispatch(NS_NewRunnableFunction(&::CoUninitialize),
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NS_DISPATCH_NORMAL);
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mThread->Shutdown();
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}
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}
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nsCOMPtr<nsIThread> GetThread() const
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{
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return mThread;
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}
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private:
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nsCOMPtr<nsIThread> mThread;
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};
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} // anonymous namespace
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static mozilla::StaticAutoPtr<BackgroundMTAData> sMTAData;
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namespace mozilla {
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namespace mscom {
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/* static */ nsCOMPtr<nsIThread>
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EnsureMTA::GetMTAThread()
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{
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if (!sMTAData) {
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sMTAData = new BackgroundMTAData();
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ClearOnShutdown(&sMTAData, ShutdownPhase::ShutdownThreads);
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}
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return sMTAData->GetThread();
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}
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} // namespace mscom
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} // namespace mozilla
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