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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/threading/platform_thread_metrics.h"
#include <memory>
#include <optional>
#include "base/check.h"
#include "base/memory/ptr_util.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "build/build_config.h"
namespace base {
// Apple and Windows have platform-specific create methods.
#if BUILDFLAG(IS_APPLE) || BUILDFLAG(IS_WIN)
// static
std::unique_ptr<PlatformThreadMetrics>
PlatformThreadMetrics::CreateForCurrentThread() {
return CreateFromHandle(PlatformThread::CurrentHandle());
}
#elif BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_CHROMEOS) || \
BUILDFLAG(IS_FUCHSIA) || BUILDFLAG(IS_LINUX)
// static
std::unique_ptr<PlatformThreadMetrics>
PlatformThreadMetrics::CreateForCurrentThread() {
return CreateFromId(PlatformThread::CurrentId());
}
// static
std::unique_ptr<PlatformThreadMetrics> PlatformThreadMetrics::CreateFromId(
PlatformThreadId tid) {
if (tid == kInvalidThreadId) {
return nullptr;
}
return WrapUnique(new PlatformThreadMetrics(tid));
}
#endif // BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_CHROMEOS) ||
// BUILDFLAG(IS_FUCHSIA) || BUILDFLAG(IS_LINUX)
PlatformThreadMetrics::~PlatformThreadMetrics() = default;
double PlatformThreadMetrics::GetCPUUsageProportion(TimeDelta cumulative_cpu) {
TimeTicks time = TimeTicks::Now();
if (!last_cpu_time_.has_value()) {
// First call, just set the last values.
CHECK(last_cumulative_cpu_.is_zero());
last_cumulative_cpu_ = cumulative_cpu;
last_cpu_time_ = time;
return 0;
}
TimeDelta cpu_time_delta = cumulative_cpu - last_cumulative_cpu_;
TimeDelta time_delta = time - last_cpu_time_.value();
if (time_delta.is_zero()) {
return 0;
}
last_cumulative_cpu_ = cumulative_cpu;
last_cpu_time_ = time;
return 100.0 * cpu_time_delta / time_delta;
}
std::optional<double> PlatformThreadMetrics::GetCPUUsageProportion() {
if (const std::optional<TimeDelta> cpu_usage = GetCumulativeCPUUsage()) {
return GetCPUUsageProportion(cpu_usage.value());
}
return std::nullopt;
}
} // namespace base
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