| // Copyright 2018 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_TASK_TASK_FEATURES_H_ |
| #define BASE_TASK_TASK_FEATURES_H_ |
| |
| #include "base/base_export.h" |
| #include "base/feature_list.h" |
| #include "base/metrics/field_trial_params.h" |
| #include "build/build_config.h" |
| |
| namespace base { |
| |
| #if BUILDFLAG(IS_WIN) || BUILDFLAG(IS_APPLE) |
| #define HAS_NATIVE_THREAD_POOL() 1 |
| #else |
| #define HAS_NATIVE_THREAD_POOL() 0 |
| #endif |
| |
| #if HAS_NATIVE_THREAD_POOL() |
| // Under this feature, ThreadPoolImpl will use a foreground ThreadGroup backed |
| // by a native thread pool implementation. The Windows Thread Pool API and |
| // libdispatch are used on Windows and macOS/iOS respectively. |
| BASE_EXPORT BASE_DECLARE_FEATURE(kUseNativeThreadPool); |
| // Under this feature, ThreadPoolImpl will use a background ThreadGroup backed |
| // by a native thread pool implementation. |
| BASE_EXPORT BASE_DECLARE_FEATURE(kUseBackgroundNativeThreadPool); |
| #endif |
| |
| // Under this feature, worker threads are not reclaimed after a timeout. Rather, |
| // only excess workers are cleaned up immediately after finishing a task. |
| BASE_EXPORT BASE_DECLARE_FEATURE(kNoWorkerThreadReclaim); |
| |
| // This feature controls whether wake ups are possible for canceled tasks. |
| BASE_EXPORT BASE_DECLARE_FEATURE(kNoWakeUpsForCanceledTasks); |
| |
| // Controls whether or not canceled delayed tasks are removed from task queues. |
| BASE_EXPORT BASE_DECLARE_FEATURE(kRemoveCanceledTasksInTaskQueue); |
| |
| // This feature controls whether or not the scheduled task is always abandoned |
| // when a timer is stopped or reset. The re-use of the scheduled task is an |
| // optimization that ensures a timer can not leave multiple canceled tasks in |
| // the task queue. Meant to be used in conjunction with |
| // kRemoveCanceledTasksInTaskQueue. |
| BASE_EXPORT BASE_DECLARE_FEATURE(kAlwaysAbandonScheduledTask); |
| |
| // This feature controls whether ThreadPool WorkerThreads should hold off waking |
| // up to purge partition alloc within the first minute of their lifetime. See |
| // base::internal::GetSleepTimeBeforePurge. |
| BASE_EXPORT BASE_DECLARE_FEATURE(kDelayFirstWorkerWake); |
| |
| // Under this feature, a non-zero leeway is added to delayed tasks. Along with |
| // DelayPolicy, this affects the time at which a delayed task runs. |
| BASE_EXPORT BASE_DECLARE_FEATURE(kAddTaskLeewayFeature); |
| constexpr TimeDelta kDefaultLeeway = Milliseconds(8); |
| extern const BASE_EXPORT base::FeatureParam<TimeDelta> kTaskLeewayParam; |
| |
| // Under this feature, wake ups are aligned at a 8ms boundary when allowed per |
| // DelayPolicy. |
| BASE_EXPORT BASE_DECLARE_FEATURE(kAlignWakeUps); |
| |
| // Under this feature, tasks that need high resolution timer are determined |
| // based on explicit DelayPolicy rather than based on a threshold. |
| BASE_EXPORT BASE_DECLARE_FEATURE(kExplicitHighResolutionTimerWin); |
| |
| // Feature to run tasks by batches before pumping out messages. |
| BASE_EXPORT BASE_DECLARE_FEATURE(kRunTasksByBatches); |
| |
| // Feature to run tasks by batches before pumping out messages. |
| BASE_EXPORT BASE_DECLARE_FEATURE(kBrowserPeriodicYieldingToNative); |
| extern const BASE_EXPORT base::FeatureParam<TimeDelta> |
| kBrowserPeriodicYieldingToNativeNormalInputAfterMsParam; |
| extern const BASE_EXPORT base::FeatureParam<TimeDelta> |
| kBrowserPeriodicYieldingToNativeFlingInputAfterMsParam; |
| extern const BASE_EXPORT base::FeatureParam<TimeDelta> |
| kBrowserPeriodicYieldingToNativeNoInputAfterMsParam; |
| extern const BASE_EXPORT base::FeatureParam<TimeDelta> |
| kBrowserPeriodicYieldingToNativeDelay; |
| |
| BASE_EXPORT void InitializeTaskLeeway(); |
| BASE_EXPORT TimeDelta GetTaskLeeway(); |
| |
| } // namespace base |
| |
| #endif // BASE_TASK_TASK_FEATURES_H_ |