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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "base/task_scheduler/utils.h" |
| 6 |
| 7 #include <utility> |
| 8 |
| 9 #include "base/logging.h" |
| 10 #include "base/memory/ptr_util.h" |
| 11 #include "base/task_scheduler/priority_queue.h" |
| 12 #include "base/task_scheduler/sequence_sort_key.h" |
| 13 #include "base/task_scheduler/task_tracker.h" |
| 14 |
| 15 namespace base { |
| 16 namespace internal { |
| 17 |
| 18 bool PostTaskHelper(std::unique_ptr<Task> task, |
| 19 scoped_refptr<Sequence> sequence, |
| 20 PriorityQueue* priority_queue, |
| 21 TaskTracker* task_tracker) { |
| 22 DCHECK(task); |
| 23 DCHECK(sequence); |
| 24 DCHECK(priority_queue); |
| 25 DCHECK(task_tracker); |
| 26 |
| 27 if (!task_tracker->WillPostTask(task.get())) |
| 28 return false; |
| 29 |
| 30 const bool sequence_was_empty = sequence->PushTask(std::move(task)); |
| 31 if (sequence_was_empty) { |
| 32 // Insert |sequence| in |priority_queue| if it was empty before |task| was |
| 33 // inserted into it. When that's not the case, one of these must be true: |
| 34 // - |sequence| is already in a PriorityQueue, or, |
| 35 // - A worker thread is running a Task from |sequence|. It will insert |
| 36 // |sequence| in a PriorityQueue once it's done running the Task. |
| 37 const auto sequence_sort_key = sequence->GetSortKey(); |
| 38 priority_queue->BeginTransaction()->Push( |
| 39 WrapUnique(new PriorityQueue::SequenceAndSortKey(std::move(sequence), |
| 40 sequence_sort_key))); |
| 41 } |
| 42 |
| 43 return true; |
| 44 } |
| 45 |
| 46 } // namespace internal |
| 47 } // namespace base |
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