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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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_RUNNER_H_ | 5 #ifndef BASE_TASK_RUNNER_H_ |
6 #define BASE_TASK_RUNNER_H_ | 6 #define BASE_TASK_RUNNER_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 | 9 |
10 #include "base/base_export.h" | 10 #include "base/base_export.h" |
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70 // to have PostDelayedTask behave the same as PostTask. | 70 // to have PostDelayedTask behave the same as PostTask. |
71 virtual bool PostDelayedTask(const tracked_objects::Location& from_here, | 71 virtual bool PostDelayedTask(const tracked_objects::Location& from_here, |
72 OnceClosure task, | 72 OnceClosure task, |
73 base::TimeDelta delay) = 0; | 73 base::TimeDelta delay) = 0; |
74 | 74 |
75 // Returns true if the current thread is a thread on which a task | 75 // Returns true if the current thread is a thread on which a task |
76 // may be run, and false if no task will be run on the current | 76 // may be run, and false if no task will be run on the current |
77 // thread. | 77 // thread. |
78 // | 78 // |
79 // It is valid for an implementation to always return true, or in | 79 // It is valid for an implementation to always return true, or in |
80 // general to use 'true' as a default value. | 80 // general to use 'true' as a default value. |
gab
2017/04/18 15:00:32
//
// Drepecated: favor RunsTasksInCurrentSequence
| |
81 virtual bool RunsTasksOnCurrentThread() const = 0; | 81 bool RunsTasksOnCurrentThread() const; |
82 | |
83 // Returns true iff tasks posted to this TaskRunner are sequenced | |
84 // with this call. | |
85 // | |
86 // In particular: | |
87 // - Returns true if this is a SequencedTaskRunner to which the | |
88 // current task was posted. | |
89 // - Returns true if this is a SequencedTaskRunner bound to the | |
90 // same sequence as the SequencedTaskRunner to which the current | |
91 // task was posted. | |
92 // - Returns true if this is a SingleThreadTaskRunner bound to | |
93 // the current thread. | |
94 // - Returns false if this is a TaskRunner that can run its tasks | |
95 // in parallel. | |
gab
2017/04/18 15:00:32
This last statement isn't true yet (SchedulerParal
| |
96 virtual bool RunsTasksInCurrentSequence() const = 0; | |
82 | 97 |
83 // Posts |task| on the current TaskRunner. On completion, |reply| | 98 // Posts |task| on the current TaskRunner. On completion, |reply| |
84 // is posted to the thread that called PostTaskAndReply(). Both | 99 // is posted to the thread that called PostTaskAndReply(). Both |
85 // |task| and |reply| are guaranteed to be deleted on the thread | 100 // |task| and |reply| are guaranteed to be deleted on the thread |
86 // from which PostTaskAndReply() is invoked. This allows objects | 101 // from which PostTaskAndReply() is invoked. This allows objects |
87 // that must be deleted on the originating thread to be bound into | 102 // that must be deleted on the originating thread to be bound into |
88 // the |task| and |reply| Closures. In particular, it can be useful | 103 // the |task| and |reply| Closures. In particular, it can be useful |
89 // to use WeakPtr<> in the |reply| Closure so that the reply | 104 // to use WeakPtr<> in the |reply| Closure so that the reply |
90 // operation can be canceled. See the following pseudo-code: | 105 // operation can be canceled. See the following pseudo-code: |
91 // | 106 // |
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141 virtual void OnDestruct() const; | 156 virtual void OnDestruct() const; |
142 }; | 157 }; |
143 | 158 |
144 struct BASE_EXPORT TaskRunnerTraits { | 159 struct BASE_EXPORT TaskRunnerTraits { |
145 static void Destruct(const TaskRunner* task_runner); | 160 static void Destruct(const TaskRunner* task_runner); |
146 }; | 161 }; |
147 | 162 |
148 } // namespace base | 163 } // namespace base |
149 | 164 |
150 #endif // BASE_TASK_RUNNER_H_ | 165 #endif // BASE_TASK_RUNNER_H_ |
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