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Side by Side Diff: base/task_scheduler/sequence_sort_key.h

Issue 1705253002: TaskScheduler [3/9] Task and Sequence (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@s_1_scheduler_lock
Patch Set: Created 4 years, 10 months ago
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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 #ifndef BASE_TASK_SCHEDULER_SEQUENCE_SORT_KEY_H_
6 #define BASE_TASK_SCHEDULER_SEQUENCE_SORT_KEY_H_
7
8 #include "base/base_export.h"
9 #include "base/gtest_prod_util.h"
10 #include "base/task_scheduler/task_traits.h"
11 #include "base/time/time.h"
12
13 namespace base {
14 namespace internal {
15
16 // A SequenceSortKey determines the position of a Sequence in a PriorityQueue.
17 // Contrary to a Sequence, which can be modified when it is inside a
18 // PriorityQueue, a SequenceSortKey is immutable.
19 class BASE_EXPORT SequenceSortKey {
20 public:
21 SequenceSortKey();
22 SequenceSortKey(TaskPriority priority, TimeTicks next_task_post_time);
gab 2016/02/18 03:00:46 Add comments on constructors to highlight differen
fdoray 2016/02/18 14:56:12 Default constructor is not needed.
23
24 // Returns true if the the sequence associated with this sort key must run
25 // after the sequence associated with |other|.
fdoray 2016/02/18 01:46:11 Or, more simply: Indicates whether the priority o
gab 2016/02/18 03:00:46 Or more simply: no comment as this is implicit fro
fdoray 2016/02/18 14:56:12 Done.
26 bool operator<(const SequenceSortKey& other) const;
27
28 // Used for testing.
gab 2016/02/18 03:00:46 Wouldn't bother with this comment.
fdoray 2016/02/18 14:56:12 Done.
29 bool operator==(const SequenceSortKey& other) const;
30
31 TaskPriority priority() const { return priority_; }
32
33 private:
34 FRIEND_TEST_ALL_PREFIXES(TaskSchedulerSequenceTest, GetSequenceSortKey);
gab 2016/02/18 03:00:46 Let's make this a struct with public members, does
fdoray 2016/02/18 14:56:12 As explained below, the members can't be const. I
35
36 // Highest task priority in the sequence at the time this sort key is created.
fdoray 2016/02/18 01:46:11 *was created?
gab 2016/02/18 03:00:46 Yes.
fdoray 2016/02/18 14:56:13 Done.
37 TaskPriority priority_;
gab 2016/02/18 03:00:46 const
fdoray 2016/02/18 14:56:12 Sadly, std::priority_queue needs operator=, which
gab 2016/02/18 20:22:34 Ugh :-(... really?! It does in place replacements
gab 2016/02/18 21:21:16 Resurfacing this.
fdoray 2016/02/18 22:19:53 Done.
38
39 // Post time of the next task to run in the sequence.
fdoray 2016/02/18 01:46:11 ... at the time this sort key was created.
fdoray 2016/02/18 14:56:12 Done.
40 TimeTicks next_task_post_time_;
gab 2016/02/18 03:00:46 const
fdoray 2016/02/18 14:56:12 Same comment as above.
41 };
42
43 } // namespace internal
44 } // namespace base
45
46 #endif // BASE_TASK_SCHEDULER_SEQUENCE_SORT_KEY_H_
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