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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 #include "base/task_scheduler/delayed_task_manager.h" | 5 #include "base/task_scheduler/delayed_task_manager.h" |
6 | 6 |
7 #include <utility> | 7 #include <algorithm> |
8 | 8 |
9 #include "base/bind.h" | 9 #include "base/bind.h" |
10 #include "base/logging.h" | 10 #include "base/logging.h" |
11 #include "base/task_runner.h" | 11 #include "base/task_runner.h" |
12 #include "base/task_scheduler/task.h" | 12 #include "base/task_scheduler/task.h" |
13 | 13 |
14 namespace base { | 14 namespace base { |
15 namespace internal { | 15 namespace internal { |
16 | 16 |
17 DelayedTaskManager::DelayedTaskManager( | 17 DelayedTaskManager::DelayedTaskManager(std::unique_ptr<TickClock> tick_clock) |
18 scoped_refptr<TaskRunner> service_thread_task_runner) | 18 : tick_clock_(std::move(tick_clock)) { |
19 : service_thread_task_runner_(std::move(service_thread_task_runner)) { | 19 DCHECK(tick_clock_); |
20 DCHECK(service_thread_task_runner_); | |
21 } | 20 } |
22 | 21 |
23 DelayedTaskManager::~DelayedTaskManager() = default; | 22 DelayedTaskManager::~DelayedTaskManager() = default; |
24 | 23 |
| 24 void DelayedTaskManager::Start( |
| 25 scoped_refptr<TaskRunner> service_thread_task_runner) { |
| 26 DCHECK(service_thread_task_runner); |
| 27 |
| 28 decltype(tasks_added_before_start_) tasks_added_before_start; |
| 29 |
| 30 { |
| 31 AutoSchedulerLock auto_lock(lock_); |
| 32 DCHECK(!service_thread_task_runner_); |
| 33 DCHECK(!started_.IsSet()); |
| 34 service_thread_task_runner_ = std::move(service_thread_task_runner); |
| 35 tasks_added_before_start = std::move(tasks_added_before_start_); |
| 36 // |service_thread_task_runner_| must not change after |started_| is set |
| 37 // (cf. comment above |lock_| in header file). |
| 38 started_.Set(); |
| 39 } |
| 40 |
| 41 const TimeTicks now = tick_clock_->NowTicks(); |
| 42 for (auto& task_and_callback : tasks_added_before_start) { |
| 43 const TimeDelta delay = |
| 44 std::max(TimeDelta(), task_and_callback.first->delayed_run_time - now); |
| 45 AddDelayedTaskNow(std::move(task_and_callback.first), delay, |
| 46 std::move(task_and_callback.second)); |
| 47 } |
| 48 } |
| 49 |
25 void DelayedTaskManager::AddDelayedTask( | 50 void DelayedTaskManager::AddDelayedTask( |
26 std::unique_ptr<Task> task, | 51 std::unique_ptr<Task> task, |
27 const PostTaskNowCallback& post_task_now_callback) { | 52 PostTaskNowCallback post_task_now_callback) { |
28 DCHECK(task); | 53 DCHECK(task); |
29 | 54 |
| 55 const TimeDelta delay = task->delay; |
| 56 DCHECK(!delay.is_zero()); |
| 57 |
30 // Use CHECK instead of DCHECK to crash earlier. See http://crbug.com/711167 | 58 // Use CHECK instead of DCHECK to crash earlier. See http://crbug.com/711167 |
31 // for details. | 59 // for details. |
32 CHECK(task->task); | 60 CHECK(task->task); |
33 | 61 |
34 const TimeDelta delay = task->delay; | 62 // If |started_| is set, the DelayedTaskManager is in a stable state and |
35 DCHECK(!delay.is_zero()); | 63 // AddDelayedTaskNow() can be called without synchronization. Otherwise, it is |
| 64 // necessary to acquire |lock_| and recheck. |
| 65 if (started_.IsSet()) { |
| 66 AddDelayedTaskNow(std::move(task), delay, |
| 67 std::move(post_task_now_callback)); |
| 68 } else { |
| 69 AutoSchedulerLock auto_lock(lock_); |
| 70 if (started_.IsSet()) { |
| 71 AddDelayedTaskNow(std::move(task), delay, |
| 72 std::move(post_task_now_callback)); |
| 73 } else { |
| 74 tasks_added_before_start_.push_back( |
| 75 {std::move(task), std::move(post_task_now_callback)}); |
| 76 } |
| 77 } |
| 78 } |
36 | 79 |
| 80 void DelayedTaskManager::AddDelayedTaskNow( |
| 81 std::unique_ptr<Task> task, |
| 82 TimeDelta delay, |
| 83 PostTaskNowCallback post_task_now_callback) { |
| 84 DCHECK(task); |
| 85 DCHECK(started_.IsSet()); |
37 // TODO(fdoray): Use |task->delayed_run_time| on the service thread | 86 // TODO(fdoray): Use |task->delayed_run_time| on the service thread |
38 // MessageLoop rather than recomputing it from |delay|. | 87 // MessageLoop rather than recomputing it from |delay|. |
39 service_thread_task_runner_->PostDelayedTask( | 88 service_thread_task_runner_->PostDelayedTask( |
40 FROM_HERE, BindOnce(post_task_now_callback, Passed(std::move(task))), | 89 FROM_HERE, |
| 90 BindOnce(std::move(post_task_now_callback), Passed(std::move(task))), |
41 delay); | 91 delay); |
42 } | 92 } |
43 | 93 |
44 } // namespace internal | 94 } // namespace internal |
45 } // namespace base | 95 } // namespace base |
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