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// Copyright 2017 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/task/sequence_manager/task_queue.h"
#include <optional>
#include <string_view>
#include <utility>
#include "base/functional/bind.h"
#include "base/memory/ptr_util.h"
#include "base/memory/weak_ptr.h"
#include "base/metrics/histogram_functions.h"
#include "base/strings/strcat.h"
#include "base/task/sequence_manager/associated_thread_id.h"
#include "base/task/sequence_manager/sequence_manager_impl.h"
#include "base/task/sequence_manager/task_queue_impl.h"
#include "base/threading/thread_checker.h"
#include "base/threading/thread_checker_impl.h"
#include "base/time/time.h"
#include "base/trace_event/trace_event.h"
namespace base::sequence_manager {
TaskQueue::QueueEnabledVoter::QueueEnabledVoter(
WeakPtr<internal::TaskQueueImpl> task_queue)
: task_queue_(std::move(task_queue)) {
task_queue_->AddQueueEnabledVoter(enabled_, *this);
}
TaskQueue::QueueEnabledVoter::~QueueEnabledVoter() {
if (task_queue_) {
task_queue_->RemoveQueueEnabledVoter(enabled_, *this);
}
}
void TaskQueue::QueueEnabledVoter::SetVoteToEnable(bool enabled) {
if (enabled == enabled_) {
return;
}
enabled_ = enabled;
if (task_queue_) {
task_queue_->OnQueueEnabledVoteChanged(enabled_);
}
}
TaskQueue::TaskTiming::TaskTiming(bool has_wall_time, bool has_thread_time)
: has_wall_time_(has_wall_time), has_thread_time_(has_thread_time) {}
void TaskQueue::TaskTiming::RecordTaskStart(LazyNow* now) {
DCHECK_EQ(State::NotStarted, state_);
state_ = State::Running;
if (has_wall_time()) {
start_time_ = now->Now();
}
if (has_thread_time()) {
start_thread_time_ = base::ThreadTicks::Now();
}
}
void TaskQueue::TaskTiming::RecordTaskEnd(LazyNow* now) {
DCHECK(state_ == State::Running || state_ == State::Finished);
if (state_ == State::Finished) {
return;
}
state_ = State::Finished;
if (has_wall_time()) {
end_time_ = now->Now();
}
if (has_thread_time()) {
end_thread_time_ = base::ThreadTicks::Now();
}
}
void TaskQueue::TaskTiming::RecordUmaOnCpuMetrics(
const std::string_view& prefix) const {
if (has_wall_time() && has_thread_time()) {
base::TimeDelta wall_time = wall_duration();
base::TimeDelta thread_time = thread_duration();
if (!wall_time.is_zero() && !thread_time.is_zero()) {
UmaHistogramCustomMicrosecondsTimes(
base::StrCat({prefix, ".TaskOnCpuDuration"}), thread_time,
base::Microseconds(1), base::Milliseconds(100), 50);
UmaHistogramCustomMicrosecondsTimes(
base::StrCat({prefix, ".TaskOffCpuDuration"}),
wall_time - thread_time, base::Microseconds(1),
base::Milliseconds(100), 50);
UmaHistogramPercentage(
base::StrCat({prefix, ".TaskOnCpuPercentage"}),
base::checked_cast<int>((thread_time * 100).IntDiv(wall_time)));
}
}
}
TaskQueue::Handle::Handle(std::unique_ptr<internal::TaskQueueImpl> task_queue)
: task_queue_(std::move(task_queue)),
sequence_manager_(task_queue_->GetSequenceManagerWeakPtr()) {}
TaskQueue::Handle::Handle() = default;
TaskQueue::Handle::~Handle() {
reset();
}
TaskQueue* TaskQueue::Handle::get() const {
return task_queue_.get();
}
TaskQueue* TaskQueue::Handle::operator->() const {
return task_queue_.get();
}
void TaskQueue::Handle::reset() {
if (!task_queue_) {
return;
}
// Sequence manager already unregistered the task queue.
if (task_queue_->IsUnregistered()) {
task_queue_.reset();
return;
}
CHECK(sequence_manager_);
sequence_manager_->UnregisterTaskQueueImpl(std::move(task_queue_));
}
TaskQueue::Handle::Handle(TaskQueue::Handle&& other) = default;
TaskQueue::Handle& TaskQueue::Handle::operator=(TaskQueue::Handle&&) = default;
} // namespace base::sequence_manager
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