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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/task/thread_pool/task_source.h"
#include <utility>
#include "base/feature_list.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/task/task_features.h"
#include "base/task/thread_pool/task_tracker.h"
namespace base {
namespace internal {
TaskSource::Transaction::Transaction(TaskSource* task_source)
: task_source_(task_source) {
task_source->lock_.Acquire();
}
TaskSource::Transaction::Transaction(TaskSource::Transaction&& other)
: task_source_(other.task_source()) {
other.task_source_ = nullptr;
}
TaskSource::Transaction::~Transaction() {
if (task_source_) {
task_source_->lock_.AssertAcquired();
task_source_->lock_.Release();
}
}
SequenceSortKey TaskSource::Transaction::GetSortKey() const {
return task_source_->GetSortKey();
}
void TaskSource::Transaction::UpdatePriority(TaskPriority priority) {
if (FeatureList::IsEnabled(kAllTasksUserBlocking))
return;
task_source_->traits_.UpdatePriority(priority);
task_source_->priority_racy_.store(task_source_->traits_.priority(),
std::memory_order_relaxed);
}
void TaskSource::SetHeapHandle(const HeapHandle& handle) {
heap_handle_ = handle;
}
void TaskSource::ClearHeapHandle() {
heap_handle_ = HeapHandle();
}
TaskSource::TaskSource(const TaskTraits& traits,
TaskRunner* task_runner,
TaskSourceExecutionMode execution_mode)
: traits_(traits),
priority_racy_(traits.priority()),
task_runner_(task_runner),
execution_mode_(execution_mode) {
DCHECK(task_runner_ ||
execution_mode_ == TaskSourceExecutionMode::kParallel ||
execution_mode_ == TaskSourceExecutionMode::kJob);
}
TaskSource::~TaskSource() = default;
TaskSource::Transaction TaskSource::BeginTransaction() {
return Transaction(this);
}
RegisteredTaskSource::RegisteredTaskSource() = default;
RegisteredTaskSource::RegisteredTaskSource(std::nullptr_t)
: RegisteredTaskSource() {}
RegisteredTaskSource::RegisteredTaskSource(
RegisteredTaskSource&& other) noexcept
:
#if DCHECK_IS_ON()
run_step_{std::exchange(other.run_step_, State::kInitial)},
#endif // DCHECK_IS_ON()
task_source_{std::move(other.task_source_)},
task_tracker_{std::exchange(other.task_tracker_, nullptr)} {
}
RegisteredTaskSource::~RegisteredTaskSource() {
Unregister();
}
// static
RegisteredTaskSource RegisteredTaskSource::CreateForTesting(
scoped_refptr<TaskSource> task_source,
TaskTracker* task_tracker) {
return RegisteredTaskSource(std::move(task_source), task_tracker);
}
scoped_refptr<TaskSource> RegisteredTaskSource::Unregister() {
#if DCHECK_IS_ON()
DCHECK_EQ(run_step_, State::kInitial);
#endif // DCHECK_IS_ON()
if (task_source_ && task_tracker_)
return task_tracker_->UnregisterTaskSource(std::move(task_source_));
return std::move(task_source_);
}
RegisteredTaskSource& RegisteredTaskSource::operator=(
RegisteredTaskSource&& other) {
Unregister();
#if DCHECK_IS_ON()
run_step_ = std::exchange(other.run_step_, State::kInitial);
#endif // DCHECK_IS_ON()
task_source_ = std::move(other.task_source_);
task_tracker_ = std::exchange(other.task_tracker_, nullptr);
return *this;
}
TaskSource::RunStatus RegisteredTaskSource::WillRunTask() {
TaskSource::RunStatus run_status = task_source_->WillRunTask();
#if DCHECK_IS_ON()
DCHECK_EQ(run_step_, State::kInitial);
if (run_status != TaskSource::RunStatus::kDisallowed)
run_step_ = State::kReady;
#endif // DCHECK_IS_ON()
return run_status;
}
Optional<Task> RegisteredTaskSource::TakeTask(
TaskSource::Transaction* transaction) {
DCHECK(!transaction || transaction->task_source() == get());
#if DCHECK_IS_ON()
DCHECK_EQ(State::kReady, run_step_);
run_step_ = State::kTaskAcquired;
#endif // DCHECK_IS_ON()
return task_source_->TakeTask(transaction);
}
Optional<Task> RegisteredTaskSource::Clear(
TaskSource::Transaction* transaction) {
DCHECK(!transaction || transaction->task_source() == get());
#if DCHECK_IS_ON()
run_step_ = State::kInitial;
#endif // DCHECK_IS_ON()
return task_source_->Clear(transaction);
}
bool RegisteredTaskSource::DidProcessTask(
TaskSource::Transaction* transaction) {
DCHECK(!transaction || transaction->task_source() == get());
#if DCHECK_IS_ON()
DCHECK_EQ(State::kTaskAcquired, run_step_);
run_step_ = State::kInitial;
#endif // DCHECK_IS_ON()
return task_source_->DidProcessTask(transaction);
}
RegisteredTaskSource::RegisteredTaskSource(
scoped_refptr<TaskSource> task_source,
TaskTracker* task_tracker)
: task_source_(std::move(task_source)), task_tracker_(task_tracker) {}
TransactionWithRegisteredTaskSource::TransactionWithRegisteredTaskSource(
RegisteredTaskSource task_source_in,
TaskSource::Transaction transaction_in)
: task_source(std::move(task_source_in)),
transaction(std::move(transaction_in)) {
DCHECK_EQ(task_source.get(), transaction.task_source());
}
// static:
TransactionWithRegisteredTaskSource
TransactionWithRegisteredTaskSource::FromTaskSource(
RegisteredTaskSource task_source_in) {
auto transaction = task_source_in->BeginTransaction();
return TransactionWithRegisteredTaskSource(std::move(task_source_in),
std::move(transaction));
}
} // namespace internal
} // namespace base
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