TaskScheduler [7] SchedulerThreadPool

base/task_scheduler/utils.cc

Index: base/task_scheduler/utils.cc
diff --git a/base/task_scheduler/utils.cc b/base/task_scheduler/utils.cc
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+// 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_scheduler/utils.h"
+
+#include <utility>
+
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "base/task_scheduler/priority_queue.h"
+#include "base/task_scheduler/sequence_sort_key.h"
+#include "base/task_scheduler/task_tracker.h"
+
+namespace base {
+namespace internal {
+
+bool PostTaskHelper(std::unique_ptr<Task> task,
+                    scoped_refptr<Sequence> sequence,
+                    PriorityQueue* priority_queue,
+                    TaskTracker* task_tracker) {
+  DCHECK(task);
+  DCHECK(sequence);
+  DCHECK(priority_queue);
+  DCHECK(task_tracker);
+
+  if (!task_tracker->WillPostTask(task.get()))
+    return false;
+
+  const bool sequence_was_empty = sequence->PushTask(std::move(task));
+  if (sequence_was_empty) {
+    // Insert |sequence| in |priority_queue| if it was empty before |task| was
+    // inserted into it. When that's not the case, one of these must be true:
+    // - |sequence| is already in a PriorityQueue, or,
+    // - A worker thread is running a Task from |sequence|. It will insert
+    //   |sequence| in a PriorityQueue once it's done running the Task.
+    const auto sequence_sort_key = sequence->GetSortKey();
+    priority_queue->BeginTransaction()->Push(
+        WrapUnique(new PriorityQueue::SequenceAndSortKey(std::move(sequence),
+                                                         sequence_sort_key)));
+  }
+
+  return true;
+}
+
+}  // namespace internal
+}  // namespace base