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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/task_scheduler.h" | 5 #include "base/task_scheduler/task_scheduler.h" |
6 | 6 |
7 #include <algorithm> | |
8 | |
9 #include "base/bind.h" | |
10 #include "base/logging.h" | 7 #include "base/logging.h" |
11 #include "base/sys_info.h" | 8 #include "base/task_scheduler/initialization_util.h" |
12 #include "base/task_scheduler/scheduler_worker_pool_params.h" | 9 #include "base/task_scheduler/scheduler_worker_pool_params.h" |
13 #include "base/task_scheduler/task_scheduler_impl.h" | 10 #include "base/task_scheduler/task_scheduler_impl.h" |
14 #include "base/threading/platform_thread.h" | 11 #include "base/threading/platform_thread.h" |
15 #include "base/time/time.h" | 12 #include "base/time/time.h" |
16 | 13 |
17 namespace base { | 14 namespace base { |
18 | 15 |
19 namespace { | 16 namespace { |
20 | 17 |
21 // |g_task_scheduler| is intentionally leaked on shutdown. | 18 // |g_task_scheduler| is intentionally leaked on shutdown. |
22 TaskScheduler* g_task_scheduler = nullptr; | 19 TaskScheduler* g_task_scheduler = nullptr; |
23 | 20 |
24 } // namespace | 21 } // namespace |
25 | 22 |
| 23 TaskSchedulerInitParams::TaskSchedulerInitParams( |
| 24 const SchedulerWorkerPoolParams& background_worker_pool_params_in, |
| 25 const SchedulerWorkerPoolParams& background_blocking_worker_pool_params_in, |
| 26 const SchedulerWorkerPoolParams& foreground_worker_pool_params_in, |
| 27 const SchedulerWorkerPoolParams& foreground_blocking_worker_pool_params_in) |
| 28 : background_worker_pool_params(background_worker_pool_params_in), |
| 29 background_blocking_worker_pool_params( |
| 30 background_blocking_worker_pool_params_in), |
| 31 foreground_worker_pool_params(foreground_worker_pool_params_in), |
| 32 foreground_blocking_worker_pool_params( |
| 33 foreground_blocking_worker_pool_params_in) {} |
| 34 |
| 35 bool TaskSchedulerInitParams::IsValid() const { |
| 36 return background_worker_pool_params.IsValid() && |
| 37 background_blocking_worker_pool_params.IsValid() && |
| 38 foreground_worker_pool_params.IsValid() && |
| 39 foreground_blocking_worker_pool_params.IsValid(); |
| 40 } |
| 41 |
26 #if !defined(OS_NACL) | 42 #if !defined(OS_NACL) |
27 // static | 43 // static |
28 void TaskScheduler::CreateAndSetSimpleTaskScheduler(const std::string& name) { | 44 void TaskScheduler::CreateAndSetSimpleTaskScheduler(const std::string& name) { |
29 constexpr int kMinNumThreads = 1; | 45 using StandbyThreadPolicy = SchedulerWorkerPoolParams::StandbyThreadPolicy; |
30 std::vector<SchedulerWorkerPoolParams> worker_pool_params_vector; | 46 |
31 worker_pool_params_vector.emplace_back( | 47 constexpr TimeDelta kSuggestedReclaimTime = TimeDelta::FromSeconds(30); |
32 name, ThreadPriority::NORMAL, | 48 constexpr int kMaxNumBackgroundThreads = 1; |
33 SchedulerWorkerPoolParams::StandbyThreadPolicy::LAZY, | 49 constexpr int kMaxNumBackgroundBlockingThreads = 2; |
34 std::max(kMinNumThreads, base::SysInfo::NumberOfProcessors()), | 50 constexpr int kMaxNumForegroundThreadsLowerBound = 2; |
35 TimeDelta::FromSeconds(30)); | 51 constexpr int kMaxNumForegroundThreadsUpperBound = 32; |
| 52 constexpr double kMaxNumForegroundThreadsCoresMultiplier = 1; |
| 53 constexpr int kMaxNumForegroundThreadsOffset = 0; |
| 54 constexpr int kMaxNumForegroundBlockingThreadsLowerBound = 2; |
| 55 constexpr int kMaxNumForegroundBlockingThreadsUpperBound = 64; |
| 56 constexpr double kMaxNumForegroundBlockingThreadsCoresMultiplier = 2; |
| 57 constexpr int kMaxNumForegroundBlockingThreadsOffset = 0; |
| 58 |
36 CreateAndSetDefaultTaskScheduler( | 59 CreateAndSetDefaultTaskScheduler( |
37 worker_pool_params_vector, | 60 name, {{StandbyThreadPolicy::LAZY, kMaxNumBackgroundThreads, |
38 Bind([](const TaskTraits&) -> size_t { return 0; })); | 61 kSuggestedReclaimTime}, |
| 62 {StandbyThreadPolicy::LAZY, kMaxNumBackgroundBlockingThreads, |
| 63 kSuggestedReclaimTime}, |
| 64 {StandbyThreadPolicy::LAZY, |
| 65 RecommendedMaxNumberOfThreadsInPool( |
| 66 kMaxNumForegroundThreadsLowerBound, |
| 67 kMaxNumForegroundThreadsUpperBound, |
| 68 kMaxNumForegroundThreadsCoresMultiplier, |
| 69 kMaxNumForegroundThreadsOffset), |
| 70 kSuggestedReclaimTime}, |
| 71 {StandbyThreadPolicy::LAZY, |
| 72 RecommendedMaxNumberOfThreadsInPool( |
| 73 kMaxNumForegroundBlockingThreadsLowerBound, |
| 74 kMaxNumForegroundBlockingThreadsUpperBound, |
| 75 kMaxNumForegroundBlockingThreadsCoresMultiplier, |
| 76 kMaxNumForegroundBlockingThreadsOffset), |
| 77 kSuggestedReclaimTime}}); |
39 } | 78 } |
40 #endif // !defined(OS_NACL) | 79 #endif // !defined(OS_NACL) |
41 | 80 |
42 // static | |
43 void TaskScheduler::CreateAndSetDefaultTaskScheduler( | 81 void TaskScheduler::CreateAndSetDefaultTaskScheduler( |
44 const std::vector<SchedulerWorkerPoolParams>& worker_pool_params_vector, | 82 const std::string& name, |
45 const WorkerPoolIndexForTraitsCallback& | 83 const TaskSchedulerInitParams& init_params) { |
46 worker_pool_index_for_traits_callback) { | 84 SetInstance(internal::TaskSchedulerImpl::Create(name, init_params)); |
47 SetInstance(internal::TaskSchedulerImpl::Create( | |
48 worker_pool_params_vector, worker_pool_index_for_traits_callback)); | |
49 } | 85 } |
50 | 86 |
51 // static | 87 // static |
52 void TaskScheduler::SetInstance(std::unique_ptr<TaskScheduler> task_scheduler) { | 88 void TaskScheduler::SetInstance(std::unique_ptr<TaskScheduler> task_scheduler) { |
53 delete g_task_scheduler; | 89 delete g_task_scheduler; |
54 g_task_scheduler = task_scheduler.release(); | 90 g_task_scheduler = task_scheduler.release(); |
55 } | 91 } |
56 | 92 |
57 // static | 93 // static |
58 TaskScheduler* TaskScheduler::GetInstance() { | 94 TaskScheduler* TaskScheduler::GetInstance() { |
59 return g_task_scheduler; | 95 return g_task_scheduler; |
60 } | 96 } |
61 | 97 |
62 } // namespace base | 98 } // namespace base |
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