71 lines
2.9 KiB
C
71 lines
2.9 KiB
C
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// Copyright 2018 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TASK_TASK_FEATURES_H_
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#define BASE_TASK_TASK_FEATURES_H_
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#include "base/base_export.h"
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#include "base/feature_list.h"
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#include "base/metrics/field_trial_params.h"
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#include "build/build_config.h"
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namespace base {
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// Under this feature, a utility_thread_group will be created for
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// running USER_VISIBLE tasks.
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BASE_EXPORT BASE_DECLARE_FEATURE(kUseUtilityThreadGroup);
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// Under this feature, worker threads are not reclaimed after a timeout. Rather,
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// only excess workers are cleaned up immediately after finishing a task.
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BASE_EXPORT BASE_DECLARE_FEATURE(kNoWorkerThreadReclaim);
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// This feature controls whether wake ups are possible for canceled tasks.
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BASE_EXPORT BASE_DECLARE_FEATURE(kNoWakeUpsForCanceledTasks);
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// Controls whether or not canceled delayed tasks are removed from task queues.
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BASE_EXPORT BASE_DECLARE_FEATURE(kRemoveCanceledTasksInTaskQueue);
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// This feature controls whether or not the scheduled task is always abandoned
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// when a timer is stopped or reset. The re-use of the scheduled task is an
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// optimization that ensures a timer can not leave multiple canceled tasks in
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// the task queue. Meant to be used in conjunction with
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// kRemoveCanceledTasksInTaskQueue.
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BASE_EXPORT BASE_DECLARE_FEATURE(kAlwaysAbandonScheduledTask);
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// This feature controls whether ThreadPool WorkerThreads should hold off waking
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// up to purge partition alloc within the first minute of their lifetime. See
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// base::internal::GetSleepTimeBeforePurge.
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BASE_EXPORT BASE_DECLARE_FEATURE(kDelayFirstWorkerWake);
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// Under this feature, a non-zero leeway is added to delayed tasks. Along with
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// DelayPolicy, this affects the time at which a delayed task runs.
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BASE_EXPORT BASE_DECLARE_FEATURE(kAddTaskLeewayFeature);
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constexpr TimeDelta kDefaultLeeway = Milliseconds(8);
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extern const BASE_EXPORT base::FeatureParam<TimeDelta> kTaskLeewayParam;
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// Under this feature, wake ups are aligned at a 8ms boundary when allowed per
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// DelayPolicy.
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BASE_EXPORT BASE_DECLARE_FEATURE(kAlignWakeUps);
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// Under this feature, tasks that need high resolution timer are determined
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// based on explicit DelayPolicy rather than based on a threshold.
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BASE_EXPORT BASE_DECLARE_FEATURE(kExplicitHighResolutionTimerWin);
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// Feature to run tasks by batches before pumping out messages.
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BASE_EXPORT BASE_DECLARE_FEATURE(kRunTasksByBatches);
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BASE_EXPORT void InitializeTaskLeeway();
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BASE_EXPORT TimeDelta GetTaskLeewayForCurrentThread();
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BASE_EXPORT TimeDelta GetDefaultTaskLeeway();
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// Controls the max number of delayed tasks that can run before selecting an
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// immediate task in sequence manager.
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BASE_EXPORT BASE_DECLARE_FEATURE(kMaxDelayedStarvationTasks);
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extern const BASE_EXPORT base::FeatureParam<int>
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kMaxDelayedStarvationTasksParam;
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} // namespace base
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#endif // BASE_TASK_TASK_FEATURES_H_
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