chromium/cc/base/histograms.cc

// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/base/histograms.h"

#include <stdint.h>

#include <algorithm>
#include <cmath>
#include <cstring>
#include <limits>

#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
#include "base/synchronization/lock.h"

namespace cc {

// Global data tracking the client name that was set.
// Both of these variables are protected by the lock.
static base::LazyInstance<base::Lock>::Leaky g_client_name_lock = …;
static const char* g_client_name = …;
static bool g_multiple_client_names_set = …;

void SetClientNameForMetrics(const char* client_name) { … }

const char* GetClientNameForMetrics() { … }

// Minimum elapsed time of 1us to limit weighting of fast calls.
static const int64_t kMinimumTimeMicroseconds = …;

ScopedUMAHistogramAreaTimerBase::ScopedUMAHistogramAreaTimerBase() : … { … }

ScopedUMAHistogramAreaTimerBase::~ScopedUMAHistogramAreaTimerBase() = default;

bool ScopedUMAHistogramAreaTimerBase::GetHistogramValues(
    Sample* time_microseconds,
    Sample* pixels_per_ms) const { … }

// static
bool ScopedUMAHistogramAreaTimerBase::GetHistogramValues(
    base::TimeDelta elapsed,
    int area,
    Sample* time_microseconds,
    Sample* pixels_per_ms) { … }

}  // namespace cc