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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/sequence.h" | |
6 | |
7 #include <utility> | |
8 | |
9 #include "base/logging.h" | |
10 | |
11 namespace base { | |
12 namespace internal { | |
13 | |
14 Sequence::Sequence() = default; | |
15 | |
16 bool Sequence::PushTask(scoped_ptr<Task> task) { | |
17 AutoSchedulerLock auto_lock(lock_); | |
18 | |
19 const TaskPriorityUnderlyingType index_priority = | |
gab
2016/02/19 16:50:47
s/index_priority/priority_index/ ? (reads better t
fdoray
2016/02/19 22:28:30
Done.
| |
20 static_cast<TaskPriorityUnderlyingType>(task->traits.priority()); | |
21 ++num_tasks_per_priority_[index_priority]; | |
22 | |
23 queue_.push(std::move(task)); | |
24 | |
25 // Return true if the sequence was empty before the push. | |
26 return queue_.size() == 1; | |
27 } | |
28 | |
29 const Task* Sequence::PeekTask() const { | |
30 AutoSchedulerLock auto_lock(lock_); | |
31 | |
32 if (queue_.empty()) | |
33 return nullptr; | |
34 | |
35 return queue_.front().get(); | |
36 } | |
37 | |
38 bool Sequence::PopTask() { | |
39 AutoSchedulerLock auto_lock(lock_); | |
40 CHECK(!queue_.empty()); | |
41 | |
42 const TaskPriorityUnderlyingType index_priority = | |
43 static_cast<TaskPriorityUnderlyingType>( | |
44 queue_.front()->traits.priority()); | |
45 --num_tasks_per_priority_[index_priority]; | |
46 | |
47 queue_.pop(); | |
48 return queue_.empty(); | |
49 } | |
50 | |
51 SequenceSortKey Sequence::GetSortKey() const { | |
52 AutoSchedulerLock auto_lock(lock_); | |
53 CHECK(!queue_.empty()); | |
54 | |
55 // Find the highest task priority in the sequence. | |
56 static_assert(static_cast<TaskPriorityUnderlyingType>( | |
57 TaskPriority::HIGHEST) == kNumTaskPriorities - 1, | |
58 ""); | |
gab
2016/02/19 16:50:47
"Unexpected priority range." or something?
Well a
fdoray
2016/02/19 22:28:30
Removed the static_assert.
| |
59 TaskPriority priority = TaskPriority::LOWEST; | |
60 for (size_t i = | |
gab
2016/02/19 16:50:47
s/size_t/TaskPriorityUnderlyingType/ now that we'r
fdoray
2016/02/19 22:28:30
Done.
| |
61 static_cast<TaskPriorityUnderlyingType>(TaskPriority::HIGHEST); | |
62 i > static_cast<TaskPriorityUnderlyingType>(TaskPriority::LOWEST); --i) { | |
63 if (num_tasks_per_priority_[i] > 0) { | |
64 priority = static_cast<TaskPriority>(i); | |
65 break; | |
66 } | |
67 } | |
68 | |
69 return SequenceSortKey(priority, queue_.front()->sequenced_time); | |
70 } | |
71 | |
72 Sequence::~Sequence() = default; | |
73 | |
74 } // namespace internal | |
75 } // namespace base | |
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