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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_BASE_WORK_QUEUE_H_ | 5 #ifndef THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_BASE_WORK_QUEUE_H_ |
6 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_BASE_WORK_QUEUE_H_ | 6 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_BASE_WORK_QUEUE_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 | 9 |
10 #include <set> | 10 #include <set> |
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91 | 91 |
92 // Test support function. This should not be used in production code. | 92 // Test support function. This should not be used in production code. |
93 void PopTaskForTest(); | 93 void PopTaskForTest(); |
94 | 94 |
95 // Returns true if the front task in this queue has an older enqueue order | 95 // Returns true if the front task in this queue has an older enqueue order |
96 // than the front task of |other_queue|. Both queue are assumed to be | 96 // than the front task of |other_queue|. Both queue are assumed to be |
97 // non-empty. This method ignores any fences. | 97 // non-empty. This method ignores any fences. |
98 bool ShouldRunBefore(const WorkQueue* other_queue) const; | 98 bool ShouldRunBefore(const WorkQueue* other_queue) const; |
99 | 99 |
100 // Submit a fence. When TakeTaskFromWorkQueue encounters a task whose | 100 // Submit a fence. When TakeTaskFromWorkQueue encounters a task whose |
101 // enqueue_order is >= |fence| then the WorkQueue will start pretending to be. | 101 // sequence number is >= |fence| then the WorkQueue will start pretending to |
102 // empty. | 102 // be. empty. |
103 // Inserting a fence may supersede a previous one and unblock some tasks. | 103 // Inserting a fence may supersede a previous one and unblock some tasks. |
104 // Returns true if any tasks where unblocked, returns false otherwise. | 104 // Returns true if any tasks where unblocked, returns false otherwise. |
105 bool InsertFence(EnqueueOrder fence); | 105 bool InsertFence(SequenceNumber fence); |
106 | 106 |
107 // Removes any fences that where added and if WorkQueue was pretending to be | 107 // Removes any fences that where added and if WorkQueue was pretending to be |
108 // empty, then the real value is reported to WorkQueueSets. Returns true if | 108 // empty, then the real value is reported to WorkQueueSets. Returns true if |
109 // any tasks where unblocked. | 109 // any tasks where unblocked. |
110 bool RemoveFence(); | 110 bool RemoveFence(); |
111 | 111 |
112 // Returns true if any tasks are blocked by the fence. Returns true if the | 112 // Returns true if any tasks are blocked by the fence. Returns true if the |
113 // queue is empty and fence has been set (i.e. future tasks would be blocked). | 113 // queue is empty and fence has been set (i.e. future tasks would be blocked). |
114 // Otherwise returns false. | 114 // Otherwise returns false. |
115 bool BlockedByFence() const; | 115 bool BlockedByFence() const; |
116 | 116 |
117 private: | 117 private: |
118 WTF::Deque<TaskQueueImpl::Task> work_queue_; | 118 WTF::Deque<TaskQueueImpl::Task> work_queue_; |
119 WorkQueueSets* work_queue_sets_; // NOT OWNED. | 119 WorkQueueSets* work_queue_sets_; // NOT OWNED. |
120 TaskQueueImpl* const task_queue_; // NOT OWNED. | 120 TaskQueueImpl* const task_queue_; // NOT OWNED. |
121 size_t work_queue_set_index_; | 121 size_t work_queue_set_index_; |
122 HeapHandle heap_handle_; | 122 HeapHandle heap_handle_; |
123 const char* const name_; | 123 const char* const name_; |
124 EnqueueOrder fence_; | 124 SequenceNumber fence_; |
125 const QueueType queue_type_; | 125 const QueueType queue_type_; |
126 | 126 |
127 DISALLOW_COPY_AND_ASSIGN(WorkQueue); | 127 DISALLOW_COPY_AND_ASSIGN(WorkQueue); |
128 }; | 128 }; |
129 | 129 |
130 } // namespace internal | 130 } // namespace internal |
131 } // namespace scheduler | 131 } // namespace scheduler |
132 } // namespace blink | 132 } // namespace blink |
133 | 133 |
134 #endif // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_BASE_WORK_QUEUE_H_ | 134 #endif // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_BASE_WORK_QUEUE_H_ |
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