// Copyright 2017 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_SCHEDULER_ENVIRONMENT_CONFIG_H_
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#define BASE_TASK_SCHEDULER_ENVIRONMENT_CONFIG_H_
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#include <stddef.h>
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#include "base/base_export.h"
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#include "base/task_scheduler/task_traits.h"
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#include "base/threading/thread.h"
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namespace base {
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namespace internal {
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enum EnvironmentType {
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FOREGROUND = 0,
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FOREGROUND_BLOCKING,
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// Pools will only be created for the environment above on platforms that
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// don't support SchedulerWorkers running with a background priority.
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ENVIRONMENT_COUNT_WITHOUT_BACKGROUND_PRIORITY,
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BACKGROUND = ENVIRONMENT_COUNT_WITHOUT_BACKGROUND_PRIORITY,
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BACKGROUND_BLOCKING,
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ENVIRONMENT_COUNT // Always last.
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};
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// Order must match the EnvironmentType enum.
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constexpr struct {
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// The threads and histograms of this environment will be labeled with
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// the task scheduler name concatenated to this.
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const char* name_suffix;
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// Preferred priority for threads in this environment; the actual thread
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// priority depends on shutdown state and platform capabilities.
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ThreadPriority priority_hint;
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} kEnvironmentParams[] = {
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{"Foreground", base::ThreadPriority::NORMAL},
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{"ForegroundBlocking", base::ThreadPriority::NORMAL},
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{"Background", base::ThreadPriority::BACKGROUND},
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{"BackgroundBlocking", base::ThreadPriority::BACKGROUND},
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};
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size_t BASE_EXPORT GetEnvironmentIndexForTraits(const TaskTraits& traits);
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// Returns true if this platform supports having SchedulerWorkers running with a
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// background priority.
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bool BASE_EXPORT CanUseBackgroundPriorityForSchedulerWorker();
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} // namespace internal
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} // namespace base
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#endif // BASE_TASK_SCHEDULER_ENVIRONMENT_CONFIG_H_
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