gecko-dev/gfx/layers/ipc/TaskThrottler.cpp

85 строки
1.8 KiB
C++

/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 8; -*- */
/* vim: set sw=2 sts=2 ts=8 et 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 "TaskThrottler.h"
namespace mozilla {
namespace layers {
TaskThrottler::TaskThrottler(const TimeStamp& aTimeStamp)
: mOutstanding(false)
, mQueuedTask(nullptr)
, mStartTime(aTimeStamp)
{ }
void
TaskThrottler::PostTask(const tracked_objects::Location& aLocation,
CancelableTask* aTask, const TimeStamp& aTimeStamp)
{
aTask->SetBirthPlace(aLocation);
if (mOutstanding) {
if (mQueuedTask) {
mQueuedTask->Cancel();
}
mQueuedTask = aTask;
} else {
mStartTime = aTimeStamp;
aTask->Run();
delete aTask;
mOutstanding = true;
}
}
void
TaskThrottler::TaskComplete(const TimeStamp& aTimeStamp)
{
if (!mOutstanding) {
return;
}
// Remove the oldest sample we have if adding a new sample takes us over our
// desired number of samples.
if (mMaxDurations > 0) {
if (mDurations.Length() >= mMaxDurations) {
mDurations.RemoveElementAt(0);
}
mDurations.AppendElement(aTimeStamp - mStartTime);
}
if (mQueuedTask) {
mStartTime = aTimeStamp;
mQueuedTask->Run();
mQueuedTask = nullptr;
} else {
mOutstanding = false;
}
}
TimeDuration
TaskThrottler::AverageDuration()
{
if (!mDurations.Length()) {
return TimeDuration();
}
TimeDuration durationSum;
for (uint32_t i = 0; i < mDurations.Length(); i++) {
durationSum += mDurations[i];
}
return durationSum / mDurations.Length();
}
TimeDuration
TaskThrottler::TimeSinceLastRequest(const TimeStamp& aTimeStamp)
{
return aTimeStamp - mStartTime;
}
}
}