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// Copyright 2017 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_THREAD_POOL_ENVIRONMENT_CONFIG_H_
#define BASE_TASK_THREAD_POOL_ENVIRONMENT_CONFIG_H_
#include <stddef.h>
#include <array>
#include "base/base_export.h"
#include "base/feature_list.h"
#include "base/task/task_traits.h"
#include "base/threading/thread.h"
namespace base {
namespace internal {
// TODO(etiennep): This is now specific to
// PooledSingleThreadTaskRunnerManager, move it there.
enum EnvironmentType {
FOREGROUND = 0,
FOREGROUND_BLOCKING,
UTILITY,
UTILITY_BLOCKING,
BACKGROUND,
BACKGROUND_BLOCKING,
ENVIRONMENT_COUNT // Always last.
};
// Order must match the EnvironmentType enum.
struct EnvironmentParams {
// The threads and histograms of this environment will be labeled with
// the thread pool name concatenated to this.
const char* name_suffix;
// Preferred type for threads in this environment; the actual thread type
// depends on shutdown state and platform capabilities.
ThreadType thread_type_hint;
};
constexpr auto kEnvironmentParams = std::to_array<EnvironmentParams>({
{"Foreground", base::ThreadType::kDefault},
{"ForegroundBlocking", base::ThreadType::kDefault},
{"Utility", base::ThreadType::kUtility},
{"UtilityBlocking", base::ThreadType::kUtility},
{"Background", base::ThreadType::kBackground},
{"BackgroundBlocking", base::ThreadType::kBackground},
});
// Returns true if this platform supports having WorkerThreads running with a
// background thread type.
bool BASE_EXPORT CanUseBackgroundThreadTypeForWorkerThread();
// Returns true if this platform supports having WorkerThreads running with a
// utility thread type.
bool BASE_EXPORT CanUseUtilityThreadTypeForWorkerThread();
} // namespace internal
} // namespace base
#endif // BASE_TASK_THREAD_POOL_ENVIRONMENT_CONFIG_H_
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