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87 lines
3.0 KiB
C++
87 lines
3.0 KiB
C++
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// Copyright 2016 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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#include "base/task/task_scheduler/task_scheduler.h"
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#include <algorithm>
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#include "base/logging.h"
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#include "base/memory/ptr_util.h"
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#include "base/sys_info.h"
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#include "base/task/task_scheduler/scheduler_worker_pool_params.h"
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#include "base/task/task_scheduler/task_scheduler_impl.h"
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#include "base/threading/platform_thread.h"
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#include "base/time/time.h"
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namespace base {
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namespace {
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// |g_task_scheduler| is intentionally leaked on shutdown.
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TaskScheduler* g_task_scheduler = nullptr;
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} // namespace
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TaskScheduler::InitParams::InitParams(
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const SchedulerWorkerPoolParams& background_worker_pool_params_in,
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const SchedulerWorkerPoolParams& background_blocking_worker_pool_params_in,
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const SchedulerWorkerPoolParams& foreground_worker_pool_params_in,
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const SchedulerWorkerPoolParams& foreground_blocking_worker_pool_params_in,
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SharedWorkerPoolEnvironment shared_worker_pool_environment_in)
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: background_worker_pool_params(background_worker_pool_params_in),
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background_blocking_worker_pool_params(
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background_blocking_worker_pool_params_in),
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foreground_worker_pool_params(foreground_worker_pool_params_in),
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foreground_blocking_worker_pool_params(
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foreground_blocking_worker_pool_params_in),
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shared_worker_pool_environment(shared_worker_pool_environment_in) {}
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TaskScheduler::InitParams::~InitParams() = default;
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#if !defined(OS_NACL)
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// static
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void TaskScheduler::CreateAndStartWithDefaultParams(StringPiece name) {
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Create(name);
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GetInstance()->StartWithDefaultParams();
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}
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void TaskScheduler::StartWithDefaultParams() {
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// Values were chosen so that:
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// * There are few background threads.
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// * Background threads never outnumber foreground threads.
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// * The system is utilized maximally by foreground threads.
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// * The main thread is assumed to be busy, cap foreground workers at
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// |num_cores - 1|.
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const int num_cores = SysInfo::NumberOfProcessors();
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constexpr int kBackgroundMaxThreads = 1;
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constexpr int kBackgroundBlockingMaxThreads = 2;
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const int kForegroundMaxThreads = std::max(1, num_cores - 1);
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const int kForegroundBlockingMaxThreads = std::max(2, num_cores - 1);
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constexpr TimeDelta kSuggestedReclaimTime = TimeDelta::FromSeconds(30);
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Start({{kBackgroundMaxThreads, kSuggestedReclaimTime},
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{kBackgroundBlockingMaxThreads, kSuggestedReclaimTime},
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{kForegroundMaxThreads, kSuggestedReclaimTime},
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{kForegroundBlockingMaxThreads, kSuggestedReclaimTime}});
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}
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#endif // !defined(OS_NACL)
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void TaskScheduler::Create(StringPiece name) {
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SetInstance(std::make_unique<internal::TaskSchedulerImpl>(name));
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}
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// static
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void TaskScheduler::SetInstance(std::unique_ptr<TaskScheduler> task_scheduler) {
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delete g_task_scheduler;
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g_task_scheduler = task_scheduler.release();
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}
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// static
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TaskScheduler* TaskScheduler::GetInstance() {
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return g_task_scheduler;
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}
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} // namespace base
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