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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/task_scheduler_util/browser/initialization.h"
#include <map>
#include <string>
#include "base/command_line.h"
#include "base/logging.h"
#include "base/task_scheduler/scheduler_worker_params.h"
#include "base/task_scheduler/switches.h"
#include "base/task_scheduler/task_traits.h"
#include "base/threading/platform_thread.h"
#include "base/threading/sequenced_worker_pool.h"
#include "components/task_scheduler_util/common/variations_util.h"
#include "components/variations/variations_associated_data.h"
namespace task_scheduler_util {
namespace {
constexpr char kFieldTrialName[] = "BrowserScheduler";
enum WorkerPoolType : size_t {
BACKGROUND = 0,
BACKGROUND_BLOCKING,
FOREGROUND,
FOREGROUND_BLOCKING,
WORKER_POOL_COUNT // Always last.
};
} // namespace
std::vector<base::SchedulerWorkerPoolParams>
GetBrowserWorkerPoolParamsFromVariations() {
using ThreadPriority = base::ThreadPriority;
std::map<std::string, std::string> variation_params;
if (!::variations::GetVariationParams(kFieldTrialName, &variation_params))
return std::vector<base::SchedulerWorkerPoolParams>();
std::vector<SchedulerImmutableWorkerPoolParams> immutable_worker_pool_params;
DCHECK_EQ(BACKGROUND, immutable_worker_pool_params.size());
immutable_worker_pool_params.emplace_back("Background",
ThreadPriority::BACKGROUND);
DCHECK_EQ(BACKGROUND_BLOCKING, immutable_worker_pool_params.size());
immutable_worker_pool_params.emplace_back("BackgroundBlocking",
ThreadPriority::BACKGROUND);
DCHECK_EQ(FOREGROUND, immutable_worker_pool_params.size());
immutable_worker_pool_params.emplace_back("Foreground",
ThreadPriority::NORMAL);
// Tasks posted to SequencedWorkerPool or BrowserThreadImpl may be redirected
// to this pool. Since COM STA is initialized in these environments, it must
// also be initialized in this pool.
DCHECK_EQ(FOREGROUND_BLOCKING, immutable_worker_pool_params.size());
immutable_worker_pool_params.emplace_back(
"ForegroundBlocking", ThreadPriority::NORMAL,
base::SchedulerBackwardCompatibility::INIT_COM_STA);
return GetWorkerPoolParams(immutable_worker_pool_params, variation_params);
}
size_t BrowserWorkerPoolIndexForTraits(const base::TaskTraits& traits) {
const bool is_background =
traits.priority() == base::TaskPriority::BACKGROUND;
if (traits.may_block() || traits.with_base_sync_primitives())
return is_background ? BACKGROUND_BLOCKING : FOREGROUND_BLOCKING;
return is_background ? BACKGROUND : FOREGROUND;
}
void MaybePerformBrowserTaskSchedulerRedirection() {
// TODO(gab): Remove this when http://crbug.com/622400 concludes.
if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableBrowserTaskScheduler) &&
variations::GetVariationParamValue(
kFieldTrialName, "RedirectSequencedWorkerPools") == "true") {
const base::TaskPriority max_task_priority =
variations::GetVariationParamValue(
kFieldTrialName, "CapSequencedWorkerPoolsAtUserVisible") == "true"
? base::TaskPriority::USER_VISIBLE
: base::TaskPriority::HIGHEST;
base::SequencedWorkerPool::EnableWithRedirectionToTaskSchedulerForProcess(
max_task_priority);
}
}
} // namespace task_scheduler_util
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