52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
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// Copyright 2018 The Chromium Authors. All rights reserved.
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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/metrics/field_trial_params.h"
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#include "build/build_config.h"
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namespace base {
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struct Feature;
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extern const BASE_EXPORT Feature kAllTasksUserBlocking;
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// Under this feature, unused threads in ThreadGroup are only detached
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// if the total number of threads in the pool is above the initial capacity.
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extern const BASE_EXPORT Feature kNoDetachBelowInitialCapacity;
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// Under this feature, workers blocked with MayBlock are replaced immediately
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// instead of waiting for a threshold in the foreground thread group.
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extern const BASE_EXPORT Feature kMayBlockWithoutDelay;
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// Under this feature, best effort capacity is never increased.
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// While it's unlikely we'd ship this as-is, this experiment allows us to
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// determine whether blocked worker replacement logic on best-effort tasks has
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// any impact on guardian metrics.
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extern const BASE_EXPORT Feature kFixedMaxBestEffortTasks;
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#if defined(OS_WIN) || defined(OS_MACOSX)
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#define HAS_NATIVE_THREAD_POOL() 1
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#else
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#define HAS_NATIVE_THREAD_POOL() 0
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#endif
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#if HAS_NATIVE_THREAD_POOL()
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// Under this feature, ThreadPoolImpl will use a ThreadGroup backed by a
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// native thread pool implementation. The Windows Thread Pool API and
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// libdispatch are used on Windows and macOS/iOS respectively.
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extern const BASE_EXPORT Feature kUseNativeThreadPool;
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#endif
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// Whether threads in the ThreadPool should be reclaimed after being idle for 5
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// minutes, instead of 30 seconds.
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extern const BASE_EXPORT Feature kUseFiveMinutesThreadReclaimTime;
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} // namespace base
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#endif // BASE_TASK_TASK_FEATURES_H_
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