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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_SCHEDULER_THREAD_POOL_H_ | |
| 6 #define BASE_TASK_SCHEDULER_SCHEDULER_THREAD_POOL_H_ | |
| 7 | |
| 8 #include <memory> | |
| 9 | |
| 10 #include "base/base_export.h" | |
| 11 #include "base/memory/ref_counted.h" | |
| 12 #include "base/task_runner.h" | |
| 13 #include "base/task_scheduler/sequence.h" | |
| 14 #include "base/task_scheduler/task.h" | |
| 15 #include "base/task_scheduler/task_traits.h" | |
| 16 | |
| 17 namespace base { | |
| 18 namespace internal { | |
| 19 | |
| 20 class SchedulerWorkerThread; | |
| 21 class SequenceSortKey; | |
| 22 | |
| 23 // Interface for a thread pool. | |
| 24 class BASE_EXPORT SchedulerThreadPool { | |
| 25 public: | |
| 26 virtual ~SchedulerThreadPool() = default; | |
| 27 | |
| 28 // Returns a TaskRunner whose PostTask invocations will result in scheduling | |
| 29 // Tasks with |traits| and |execution_mode| in this SchedulerThreadPool. | |
| 30 virtual scoped_refptr<TaskRunner> CreateTaskRunnerWithTraits( | |
| 31 const TaskTraits& traits, | |
| 32 ExecutionMode execution_mode) = 0; | |
| 33 | |
| 34 // Inserts |sequence| with |sequence_sort_key| into a queue of Sequences that | |
| 35 // can be processed by any worker thread owned by this SchedulerThreadPool. | |
| 36 // Must only be used to put |sequence| back into a queue after running a Task | |
| 37 // from it. The thread that calls this doesn't have to belong to this | |
| 38 // SchedulerThreadPool. | |
| 39 virtual void ReEnqueueSequence(scoped_refptr<Sequence> sequence, | |
| 40 const SequenceSortKey& sequence_sort_key) = 0; | |
| 41 | |
| 42 // Posts |task| to be executed by this SchedulerThreadPool as part of | |
| 43 // |sequence|. If |worker_thread| is non-null, |task| will be scheduled to run | |
| 44 // on it specifically (note: |worker_thread| must be owned by this | |
| 45 // SchedulerThreadPool); otherwise, |task| will be added to the pending shared | |
| 46 // work. |task| won't be executed before its delayed run time, if any. Returns | |
| 47 // true if |task| is posted. | |
| 48 virtual bool PostTaskWithSequence(std::unique_ptr<Task> task, | |
| 49 scoped_refptr<Sequence> sequence, | |
| 50 SchedulerWorkerThread* worker_thread) = 0; | |
| 51 | |
| 52 // Posts |task| to be executed by this SchedulerThreadPool as part of | |
| 53 // |sequence|. If |worker_thread| is non-null, |task| will be scheduled to run | |
| 54 // on it specifically (note: |worker_thread| must be owned by this | |
| 55 // SchedulerThreadPool); otherwise, |task| will be added to the pending shared | |
| 56 // work. This must only be called after |task| has gone through | |
| 57 // PostTaskWithSequence() and after |task|'s delayed run time. | |
| 58 virtual void PostTaskWithSequenceNow( | |
| 59 std::unique_ptr<Task> task, | |
| 60 scoped_refptr<Sequence> sequence, | |
| 61 SchedulerWorkerThread* worker_thread) = 0; | |
| 62 }; | |
| 63 | |
| 64 } // namespace internal | |
| 65 } // namespace base | |
| 66 | |
| 67 #endif // BASE_TASK_SCHEDULER_SCHEDULER_THREAD_POOL_H_ | |
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