gecko-dev/js/ipc/CPOWTimer.cpp

44 lines
1.1 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 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 "jsfriendapi.h"
#include "nsContentUtils.h"
#include "CPOWTimer.h"
#include "jsapi.h"
CPOWTimer::CPOWTimer(JSContext* cx MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)
: cx_(nullptr)
, startInterval_(0)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
if (!js::GetStopwatchIsMonitoringCPOW(cx))
return;
cx_ = cx;
startInterval_ = JS_Now();
}
CPOWTimer::~CPOWTimer()
{
if (!cx_) {
// Monitoring was off when we started the timer.
return;
}
if (!js::GetStopwatchIsMonitoringCPOW(cx_)) {
// Monitoring has been deactivated while we were in the timer.
return;
}
const int64_t endInterval = JS_Now();
if (endInterval <= startInterval_) {
// Do not assume monotonicity.
return;
}
js::AddCPOWPerformanceDelta(cx_, endInterval - startInterval_);
}