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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_H_ | |
6 #define BASE_TASK_SCHEDULER_SEQUENCE_H_ | |
7 | |
8 #include <stddef.h> | |
9 | |
10 #include <queue> | |
11 | |
12 #include "base/base_export.h" | |
13 #include "base/macros.h" | |
14 #include "base/memory/ref_counted.h" | |
15 #include "base/memory/scoped_ptr.h" | |
16 #include "base/task_scheduler/scheduler_lock.h" | |
17 #include "base/task_scheduler/sequence_sort_key.h" | |
18 #include "base/task_scheduler/task.h" | |
19 #include "base/task_scheduler/task_traits.h" | |
20 | |
21 namespace base { | |
22 namespace internal { | |
23 | |
24 // A sequence holds tasks that must be executed in posting order. This class is | |
25 // thread-safe. | |
26 class BASE_EXPORT Sequence : public RefCountedThreadSafe<Sequence> { | |
27 public: | |
28 Sequence(); | |
29 | |
30 // Adds |task| at the end of the sequence's queue. |prev_num_tasks| is set to | |
31 // the number of tasks that were in the sequence prior to the push. | |
32 void PushTask(scoped_ptr<Task> task, size_t* prev_num_tasks); | |
gab
2016/02/18 03:00:46
Return |prev_num_tasks| instead of using an out-pa
fdoray
2016/02/18 14:56:12
Done.
| |
33 | |
34 // Returns the sequence in front of the sequence's queue, if any. | |
fdoray
2016/02/18 01:46:11
Returns the *task
fdoray
2016/02/18 14:56:12
Done.
| |
35 const Task* PeekTask(); | |
36 | |
37 // Removes the task in front of the sequence's queue. |new_num_tasks| is set | |
38 // to the number of tasks that are in the sequence right after the pop. This | |
39 // cannot be called on an empty sequence. | |
40 void PopTask(size_t* new_num_tasks); | |
gab
2016/02/18 03:00:46
Same comment here, use return value and try to mak
fdoray
2016/02/18 14:56:12
Done.
| |
41 | |
42 // Returns a sort key to use when inserting the sequence in a priority queue. | |
gab
2016/02/18 03:00:46
s/sort key/SequenceSortKey/
fdoray
2016/02/18 14:56:12
Done.
| |
43 // This cannot be called on an empty sequence. | |
44 SequenceSortKey GetSortKey(); | |
45 | |
46 private: | |
47 friend class RefCountedThreadSafe<Sequence>; | |
48 ~Sequence(); | |
49 | |
50 // Controls access to all members. | |
51 SchedulerLock lock_; | |
52 | |
53 // Queue of tasks to execute. | |
54 std::queue<scoped_ptr<Task>> queue_; | |
55 | |
56 // Number of tasks contained in the sequence for each priority. | |
57 size_t num_tasks_per_priority_[kNumTaskPriorities]; | |
58 | |
59 DISALLOW_COPY_AND_ASSIGN(Sequence); | |
60 }; | |
61 | |
62 } // namespace internal | |
63 } // namespace base | |
64 | |
65 #endif // BASE_TASK_SCHEDULER_SEQUENCE_H_ | |
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