зеркало из https://github.com/mozilla/gecko-dev.git
154 строки
3.9 KiB
C++
154 строки
3.9 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/MainThreadInvoker.h"
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#include "GeckoProfiler.h"
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#include "MainThreadUtils.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/ClearOnShutdown.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/HangMonitor.h"
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#include "mozilla/mscom/SpinEvent.h"
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#include "mozilla/RefPtr.h"
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#include "mozilla/SystemGroup.h"
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#include "private/prpriv.h" // For PR_GetThreadID
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#include "WinUtils.h"
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namespace {
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/**
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* SyncRunnable implements different code paths depending on whether or not
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* we are running on a multiprocessor system. In the multiprocessor case, we
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* leave the thread in a spin loop while waiting for the main thread to execute
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* our runnable. Since spinning is pointless in the uniprocessor case, we block
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* on an event that is set by the main thread once it has finished the runnable.
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*/
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class SyncRunnable : public mozilla::Runnable
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{
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public:
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explicit SyncRunnable(already_AddRefed<nsIRunnable> aRunnable)
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: mozilla::Runnable("MainThreadInvoker")
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, mRunnable(aRunnable)
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{}
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~SyncRunnable() = default;
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NS_IMETHOD Run()
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{
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if (mHasRun) {
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return NS_OK;
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}
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mHasRun = true;
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TimeStamp runStart(TimeStamp::Now());
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mRunnable->Run();
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TimeStamp runEnd(TimeStamp::Now());
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mDuration = runEnd - runStart;
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mEvent.Signal();
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return NS_OK;
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}
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bool WaitUntilComplete()
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{
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return mEvent.Wait(mozilla::mscom::MainThreadInvoker::GetTargetThread());
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}
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const mozilla::TimeDuration& GetDuration() const
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{
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return mDuration;
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}
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private:
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bool mHasRun = false;
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nsCOMPtr<nsIRunnable> mRunnable;
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mozilla::mscom::SpinEvent mEvent;
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mozilla::TimeDuration mDuration;
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};
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} // anonymous namespace
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namespace mozilla {
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namespace mscom {
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HANDLE MainThreadInvoker::sMainThread = nullptr;
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/* static */ bool
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MainThreadInvoker::InitStatics()
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{
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nsCOMPtr<nsIThread> mainThread;
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nsresult rv = ::NS_GetMainThread(getter_AddRefs(mainThread));
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if (NS_FAILED(rv)) {
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return false;
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}
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PRThread* mainPrThread = nullptr;
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rv = mainThread->GetPRThread(&mainPrThread);
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if (NS_FAILED(rv)) {
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return false;
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}
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PRUint32 tid = ::PR_GetThreadID(mainPrThread);
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sMainThread = ::OpenThread(SYNCHRONIZE | THREAD_SET_CONTEXT, FALSE, tid);
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return !!sMainThread;
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}
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MainThreadInvoker::MainThreadInvoker()
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{
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static const bool gotStatics = InitStatics();
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MOZ_ASSERT(gotStatics);
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}
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bool
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MainThreadInvoker::Invoke(already_AddRefed<nsIRunnable>&& aRunnable)
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{
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nsCOMPtr<nsIRunnable> runnable(Move(aRunnable));
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if (!runnable) {
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return false;
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}
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if (NS_IsMainThread()) {
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runnable->Run();
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return true;
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}
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RefPtr<SyncRunnable> syncRunnable = new SyncRunnable(runnable.forget());
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if (NS_FAILED(SystemGroup::Dispatch(
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TaskCategory::Other, do_AddRef(syncRunnable)))) {
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return false;
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}
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// This ref gets released in MainThreadAPC when it runs.
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SyncRunnable* syncRunnableRef = syncRunnable.get();
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NS_ADDREF(syncRunnableRef);
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if (!::QueueUserAPC(&MainThreadAPC, sMainThread,
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reinterpret_cast<UINT_PTR>(syncRunnableRef))) {
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return false;
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}
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bool result = syncRunnable->WaitUntilComplete();
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mDuration = syncRunnable->GetDuration();
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return result;
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}
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/* static */ VOID CALLBACK
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MainThreadInvoker::MainThreadAPC(ULONG_PTR aParam)
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{
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AUTO_PROFILER_THREAD_WAKE;
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mozilla::HangMonitor::NotifyActivity(mozilla::HangMonitor::kGeneralActivity);
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MOZ_ASSERT(NS_IsMainThread());
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auto runnable = reinterpret_cast<SyncRunnable*>(aParam);
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runnable->Run();
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NS_RELEASE(runnable);
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}
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} // namespace mscom
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} // namespace mozilla
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