mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-28 08:16:09 +03:00
81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
// Copyright 2016 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/task_scheduler/sequence.h"
|
|
|
|
#include <utility>
|
|
|
|
#include "base/logging.h"
|
|
#include "base/time/time.h"
|
|
|
|
namespace base {
|
|
namespace internal {
|
|
|
|
Sequence::Sequence() = default;
|
|
|
|
bool Sequence::PushTask(Task task) {
|
|
// Use CHECK instead of DCHECK to crash earlier. See http://crbug.com/711167
|
|
// for details.
|
|
CHECK(task.task);
|
|
DCHECK(task.sequenced_time.is_null());
|
|
task.sequenced_time = base::TimeTicks::Now();
|
|
|
|
AutoSchedulerLock auto_lock(lock_);
|
|
++num_tasks_per_priority_[static_cast<int>(task.traits.priority())];
|
|
queue_.push(std::move(task));
|
|
|
|
// Return true if the sequence was empty before the push.
|
|
return queue_.size() == 1;
|
|
}
|
|
|
|
Optional<Task> Sequence::TakeTask() {
|
|
AutoSchedulerLock auto_lock(lock_);
|
|
DCHECK(!queue_.empty());
|
|
DCHECK(queue_.front().task);
|
|
|
|
const int priority_index = static_cast<int>(queue_.front().traits.priority());
|
|
DCHECK_GT(num_tasks_per_priority_[priority_index], 0U);
|
|
--num_tasks_per_priority_[priority_index];
|
|
|
|
return std::move(queue_.front());
|
|
}
|
|
|
|
bool Sequence::Pop() {
|
|
AutoSchedulerLock auto_lock(lock_);
|
|
DCHECK(!queue_.empty());
|
|
DCHECK(!queue_.front().task);
|
|
queue_.pop();
|
|
return queue_.empty();
|
|
}
|
|
|
|
SequenceSortKey Sequence::GetSortKey() const {
|
|
TaskPriority priority = TaskPriority::LOWEST;
|
|
base::TimeTicks next_task_sequenced_time;
|
|
|
|
{
|
|
AutoSchedulerLock auto_lock(lock_);
|
|
DCHECK(!queue_.empty());
|
|
|
|
// Find the highest task priority in the sequence.
|
|
const int highest_priority_index = static_cast<int>(TaskPriority::HIGHEST);
|
|
const int lowest_priority_index = static_cast<int>(TaskPriority::LOWEST);
|
|
for (int i = highest_priority_index; i > lowest_priority_index; --i) {
|
|
if (num_tasks_per_priority_[i] > 0) {
|
|
priority = static_cast<TaskPriority>(i);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Save the sequenced time of the next task in the sequence.
|
|
next_task_sequenced_time = queue_.front().sequenced_time;
|
|
}
|
|
|
|
return SequenceSortKey(priority, next_task_sequenced_time);
|
|
}
|
|
|
|
Sequence::~Sequence() = default;
|
|
|
|
} // namespace internal
|
|
} // namespace base
|