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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 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 | 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 BASE_TASK_SCHEDULER_SCHEDULER_WORKER_H_ | 5 #ifndef BASE_TASK_SCHEDULER_SCHEDULER_WORKER_H_ |
6 #define BASE_TASK_SCHEDULER_SCHEDULER_WORKER_H_ | 6 #define BASE_TASK_SCHEDULER_SCHEDULER_WORKER_H_ |
7 | 7 |
8 #include <memory> | 8 #include <memory> |
9 | 9 |
10 #include "base/base_export.h" | 10 #include "base/base_export.h" |
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78 // When true is returned: | 78 // When true is returned: |
79 // - The next WakeUp() could be more costly due to new thread creation. | 79 // - The next WakeUp() could be more costly due to new thread creation. |
80 // - The worker will take this as a signal that it can detach, but it is not | 80 // - The worker will take this as a signal that it can detach, but it is not |
81 // obligated to do so. | 81 // obligated to do so. |
82 virtual bool CanDetach(SchedulerWorker* worker) = 0; | 82 virtual bool CanDetach(SchedulerWorker* worker) = 0; |
83 | 83 |
84 // Called by a thread before it detaches. This method is not allowed to | 84 // Called by a thread before it detaches. This method is not allowed to |
85 // acquire a SchedulerLock because it is called within the scope of another | 85 // acquire a SchedulerLock because it is called within the scope of another |
86 // SchedulerLock. | 86 // SchedulerLock. |
87 virtual void OnDetach() = 0; | 87 virtual void OnDetach() = 0; |
| 88 |
| 89 // Called by a thread right before the main function exits. |
| 90 virtual void OnMainExit() {} |
88 }; | 91 }; |
89 | 92 |
90 enum class InitialState { ALIVE, DETACHED }; | 93 enum class InitialState { ALIVE, DETACHED }; |
91 | 94 |
92 // Creates a SchedulerWorker that runs Tasks from Sequences returned by | 95 // Creates a SchedulerWorker that runs Tasks from Sequences returned by |
93 // |delegate|. |priority_hint| is the preferred thread priority; the actual | 96 // |delegate|. |priority_hint| is the preferred thread priority; the actual |
94 // thread priority depends on shutdown state and platform capabilities. | 97 // thread priority depends on shutdown state and platform capabilities. |
95 // |task_tracker| is used to handle shutdown behavior of Tasks. If | 98 // |task_tracker| is used to handle shutdown behavior of Tasks. If |
96 // |worker_state| is DETACHED, the thread will be created upon a WakeUp(). | 99 // |worker_state| is DETACHED, the thread will be created upon a WakeUp(). |
97 // Returns nullptr if creating the underlying platform thread fails during | 100 // Returns nullptr if creating the underlying platform thread fails during |
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189 // Set once JoinForTesting() has been called. | 192 // Set once JoinForTesting() has been called. |
190 AtomicFlag join_called_for_testing_; | 193 AtomicFlag join_called_for_testing_; |
191 | 194 |
192 DISALLOW_COPY_AND_ASSIGN(SchedulerWorker); | 195 DISALLOW_COPY_AND_ASSIGN(SchedulerWorker); |
193 }; | 196 }; |
194 | 197 |
195 } // namespace internal | 198 } // namespace internal |
196 } // namespace base | 199 } // namespace base |
197 | 200 |
198 #endif // BASE_TASK_SCHEDULER_SCHEDULER_WORKER_H_ | 201 #endif // BASE_TASK_SCHEDULER_SCHEDULER_WORKER_H_ |
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