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// 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 "third_party/blink/renderer/platform/scheduler/common/scheduler_helper.h"
#include <utility>
#include "base/task/sequence_manager/sequence_manager_impl.h"
#include "base/task/sequence_manager/task_queue.h"
#include "base/task/single_thread_task_runner.h"
#include "base/time/default_tick_clock.h"
#include "base/trace_event/trace_event.h"
#include "base/trace_event/traced_value.h"
namespace blink {
namespace scheduler {
using base::sequence_manager::SequenceManager;
using base::sequence_manager::TaskQueue;
using base::sequence_manager::TaskTimeObserver;
using base::sequence_manager::TimeDomain;
SchedulerHelper::SchedulerHelper(SequenceManager* sequence_manager)
: sequence_manager_(sequence_manager), observer_(nullptr) {
sequence_manager_->SetWorkBatchSize(4);
}
void SchedulerHelper::InitDefaultTaskRunner(
scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
default_task_runner_ = std::move(task_runner);
// Invoking SequenceManager::SetDefaultTaskRunner() before attaching the
// SchedulerHelper to a thread is fine. The default TaskRunner will be stored
// in TLS by the ThreadController before tasks are executed.
DCHECK(sequence_manager_);
sequence_manager_->SetDefaultTaskRunner(default_task_runner_);
}
void SchedulerHelper::AttachToCurrentThread() {
DETACH_FROM_THREAD(thread_checker_);
CheckOnValidThread();
DCHECK(default_task_runner_)
<< "Must be invoked after InitDefaultTaskRunner().";
}
SchedulerHelper::~SchedulerHelper() {
Shutdown();
}
void SchedulerHelper::Shutdown() {
CheckOnValidThread();
if (!sequence_manager_)
return;
ShutdownAllQueues();
sequence_manager_->SetObserver(nullptr);
sequence_manager_ = nullptr;
}
void SchedulerHelper::SetWorkBatchSizeForTesting(int work_batch_size) {
CheckOnValidThread();
DCHECK(sequence_manager_);
sequence_manager_->SetWorkBatchSize(work_batch_size);
}
bool SchedulerHelper::GetAndClearSystemIsQuiescentBit() {
CheckOnValidThread();
DCHECK(sequence_manager_);
return sequence_manager_->GetAndClearSystemIsQuiescentBit();
}
void SchedulerHelper::AddTaskObserver(base::TaskObserver* task_observer) {
CheckOnValidThread();
if (sequence_manager_) {
static_cast<base::sequence_manager::internal::SequenceManagerImpl*>(
sequence_manager_)
->AddTaskObserver(task_observer);
}
}
void SchedulerHelper::RemoveTaskObserver(base::TaskObserver* task_observer) {
CheckOnValidThread();
if (sequence_manager_) {
static_cast<base::sequence_manager::internal::SequenceManagerImpl*>(
sequence_manager_)
->RemoveTaskObserver(task_observer);
}
}
void SchedulerHelper::AddTaskTimeObserver(
TaskTimeObserver* task_time_observer) {
if (sequence_manager_)
sequence_manager_->AddTaskTimeObserver(task_time_observer);
}
void SchedulerHelper::RemoveTaskTimeObserver(
TaskTimeObserver* task_time_observer) {
if (sequence_manager_)
sequence_manager_->RemoveTaskTimeObserver(task_time_observer);
}
void SchedulerHelper::SetObserver(Observer* observer) {
CheckOnValidThread();
observer_ = observer;
DCHECK(sequence_manager_);
sequence_manager_->SetObserver(this);
}
void SchedulerHelper::ReclaimMemory() {
CheckOnValidThread();
DCHECK(sequence_manager_);
sequence_manager_->ReclaimMemory();
}
std::optional<base::sequence_manager::WakeUp> SchedulerHelper::GetNextWakeUp()
const {
CheckOnValidThread();
DCHECK(sequence_manager_);
return sequence_manager_->GetNextDelayedWakeUp();
}
void SchedulerHelper::SetTimeDomain(
base::sequence_manager::TimeDomain* time_domain) {
CheckOnValidThread();
DCHECK(sequence_manager_);
return sequence_manager_->SetTimeDomain(time_domain);
}
void SchedulerHelper::ResetTimeDomain() {
CheckOnValidThread();
DCHECK(sequence_manager_);
return sequence_manager_->ResetTimeDomain();
}
void SchedulerHelper::OnBeginNestedRunLoop() {
++nested_runloop_depth_;
if (observer_)
observer_->OnBeginNestedRunLoop();
}
void SchedulerHelper::OnExitNestedRunLoop() {
--nested_runloop_depth_;
DCHECK_GE(nested_runloop_depth_, 0);
if (observer_)
observer_->OnExitNestedRunLoop();
}
const base::TickClock* SchedulerHelper::GetClock() const {
if (sequence_manager_)
return sequence_manager_->GetTickClock();
return nullptr;
}
base::TimeTicks SchedulerHelper::NowTicks() const {
if (sequence_manager_)
return sequence_manager_->NowTicks();
// We may need current time for tracing when shutting down worker thread.
return base::TimeTicks::Now();
}
} // namespace scheduler
} // namespace blink
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