gecko-dev/tools/profiler/ThreadResponsiveness.cpp

118 lines
2.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "ThreadResponsiveness.h"
#include "platform.h"
#include "nsComponentManagerUtils.h"
#include "nsThreadUtils.h"
#include "nsITimer.h"
#include "mozilla/Monitor.h"
#include "ProfileEntry.h"
using mozilla::Monitor;
using mozilla::MonitorAutoLock;
using mozilla::TimeStamp;
class CheckResponsivenessTask : public nsRunnable,
public nsITimerCallback {
public:
CheckResponsivenessTask()
: mLastTracerTime(TimeStamp::Now())
, mMonitor("CheckResponsivenessTask")
, mTimer(nullptr)
, mStop(false)
{
MOZ_COUNT_CTOR(CheckResponsivenessTask);
}
protected:
~CheckResponsivenessTask()
{
MOZ_COUNT_DTOR(CheckResponsivenessTask);
}
public:
NS_IMETHOD Run()
{
MonitorAutoLock mon(mMonitor);
if (mStop)
return NS_OK;
// This is raced on because we might pause the thread here
// for profiling so if we tried to use a monitor to protect
// mLastTracerTime we could deadlock. We're risking seeing
// a partial write which will show up as an outlier in our
// performance data.
mLastTracerTime = TimeStamp::Now();
if (!mTimer) {
mTimer = do_CreateInstance("@mozilla.org/timer;1");
}
mTimer->InitWithCallback(this, 16, nsITimer::TYPE_ONE_SHOT);
return NS_OK;
}
NS_IMETHODIMP Notify(nsITimer* aTimer) MOZ_FINAL
{
NS_DispatchToMainThread(this);
return NS_OK;
}
void Terminate() {
MonitorAutoLock mon(mMonitor);
mStop = true;
}
const TimeStamp& GetLastTracerTime() const {
return mLastTracerTime;
}
NS_DECL_ISUPPORTS_INHERITED
private:
TimeStamp mLastTracerTime;
Monitor mMonitor;
nsCOMPtr<nsITimer> mTimer;
bool mStop;
};
NS_IMPL_ISUPPORTS_INHERITED(CheckResponsivenessTask, nsRunnable, nsITimerCallback)
ThreadResponsiveness::ThreadResponsiveness(ThreadProfile *aThreadProfile)
: mThreadProfile(aThreadProfile)
, mActiveTracerEvent(nullptr)
{
MOZ_COUNT_CTOR(ThreadResponsiveness);
}
ThreadResponsiveness::~ThreadResponsiveness()
{
MOZ_COUNT_DTOR(ThreadResponsiveness);
if (mActiveTracerEvent) {
mActiveTracerEvent->Terminate();
}
}
void
ThreadResponsiveness::Update()
{
return;
if (!mActiveTracerEvent) {
if (mThreadProfile->GetThreadInfo()->IsMainThread()) {
mActiveTracerEvent = new CheckResponsivenessTask();
NS_DispatchToMainThread(mActiveTracerEvent);
} else if (mThreadProfile->GetThreadInfo()->GetThread()) {
mActiveTracerEvent = new CheckResponsivenessTask();
mThreadProfile->GetThreadInfo()->
GetThread()->Dispatch(mActiveTracerEvent, NS_DISPATCH_NORMAL);
}
}
if (mActiveTracerEvent) {
mLastTracerTime = mActiveTracerEvent->GetLastTracerTime();
}
}