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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> | 7 #include <algorithm> |
8 | 8 |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 #include "base/sys_info.h" | 10 #include "base/sys_info.h" |
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31 background_blocking_worker_pool_params( | 31 background_blocking_worker_pool_params( |
32 background_blocking_worker_pool_params_in), | 32 background_blocking_worker_pool_params_in), |
33 foreground_worker_pool_params(foreground_worker_pool_params_in), | 33 foreground_worker_pool_params(foreground_worker_pool_params_in), |
34 foreground_blocking_worker_pool_params( | 34 foreground_blocking_worker_pool_params( |
35 foreground_blocking_worker_pool_params_in) {} | 35 foreground_blocking_worker_pool_params_in) {} |
36 | 36 |
37 TaskScheduler::InitParams::~InitParams() = default; | 37 TaskScheduler::InitParams::~InitParams() = default; |
38 | 38 |
39 #if !defined(OS_NACL) | 39 #if !defined(OS_NACL) |
40 // static | 40 // static |
41 void TaskScheduler::CreateAndSetSimpleTaskScheduler(const std::string& name) { | 41 void TaskScheduler::CreateAndSetSimpleTaskScheduler(StringPiece name) { |
42 using StandbyThreadPolicy = SchedulerWorkerPoolParams::StandbyThreadPolicy; | 42 using StandbyThreadPolicy = SchedulerWorkerPoolParams::StandbyThreadPolicy; |
43 | 43 |
44 // Values were chosen so that: | 44 // Values were chosen so that: |
45 // * There are few background threads. | 45 // * There are few background threads. |
46 // * Background threads never outnumber foreground threads. | 46 // * Background threads never outnumber foreground threads. |
47 // * The system is utilized maximally by foreground threads. | 47 // * The system is utilized maximally by foreground threads. |
48 const int num_cores = SysInfo::NumberOfProcessors(); | 48 const int num_cores = SysInfo::NumberOfProcessors(); |
49 constexpr int kBackgroundMaxThreads = 1; | 49 constexpr int kBackgroundMaxThreads = 1; |
50 constexpr int kBackgroundBlockingMaxThreads = 2; | 50 constexpr int kBackgroundBlockingMaxThreads = 2; |
51 const int kForegroundMaxThreads = std::max(1, num_cores); | 51 const int kForegroundMaxThreads = std::max(1, num_cores); |
52 const int kForegroundBlockingMaxThreads = std::max(2, num_cores); | 52 const int kForegroundBlockingMaxThreads = std::max(2, num_cores); |
53 | 53 |
54 constexpr TimeDelta kSuggestedReclaimTime = TimeDelta::FromSeconds(30); | 54 constexpr TimeDelta kSuggestedReclaimTime = TimeDelta::FromSeconds(30); |
55 | 55 |
56 CreateAndSetDefaultTaskScheduler( | 56 CreateAndSetDefaultTaskScheduler( |
57 name, {{StandbyThreadPolicy::LAZY, kBackgroundMaxThreads, | 57 name, {{StandbyThreadPolicy::LAZY, kBackgroundMaxThreads, |
58 kSuggestedReclaimTime}, | 58 kSuggestedReclaimTime}, |
59 {StandbyThreadPolicy::LAZY, kBackgroundBlockingMaxThreads, | 59 {StandbyThreadPolicy::LAZY, kBackgroundBlockingMaxThreads, |
60 kSuggestedReclaimTime}, | 60 kSuggestedReclaimTime}, |
61 {StandbyThreadPolicy::LAZY, kForegroundMaxThreads, | 61 {StandbyThreadPolicy::LAZY, kForegroundMaxThreads, |
62 kSuggestedReclaimTime}, | 62 kSuggestedReclaimTime}, |
63 {StandbyThreadPolicy::LAZY, kForegroundBlockingMaxThreads, | 63 {StandbyThreadPolicy::LAZY, kForegroundBlockingMaxThreads, |
64 kSuggestedReclaimTime}}); | 64 kSuggestedReclaimTime}}); |
65 } | 65 } |
66 #endif // !defined(OS_NACL) | 66 #endif // !defined(OS_NACL) |
67 | 67 |
68 void TaskScheduler::CreateAndSetDefaultTaskScheduler( | 68 void TaskScheduler::CreateAndSetDefaultTaskScheduler( |
69 const std::string& name, | 69 StringPiece name, |
70 const InitParams& init_params) { | 70 const InitParams& init_params) { |
71 SetInstance(internal::TaskSchedulerImpl::Create(name, init_params)); | 71 SetInstance(internal::TaskSchedulerImpl::Create(name, init_params)); |
72 } | 72 } |
73 | 73 |
74 // static | 74 // static |
75 void TaskScheduler::SetInstance(std::unique_ptr<TaskScheduler> task_scheduler) { | 75 void TaskScheduler::SetInstance(std::unique_ptr<TaskScheduler> task_scheduler) { |
76 delete g_task_scheduler; | 76 delete g_task_scheduler; |
77 g_task_scheduler = task_scheduler.release(); | 77 g_task_scheduler = task_scheduler.release(); |
78 } | 78 } |
79 | 79 |
80 // static | 80 // static |
81 TaskScheduler* TaskScheduler::GetInstance() { | 81 TaskScheduler* TaskScheduler::GetInstance() { |
82 return g_task_scheduler; | 82 return g_task_scheduler; |
83 } | 83 } |
84 | 84 |
85 } // namespace base | 85 } // namespace base |
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