node/src/node_platform.cc at fix/888923 · ofrobots/node · GitHub

History

531 lines (450 loc) · 16 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

#include "node_platform.h"

#include "node_internals.h"

#include "env-inl.h"

#include "debug_utils.h"

#include "util.h"

#include <algorithm>

namespace node {

using v8::HandleScope;

using v8::Isolate;

using v8::Local;

using v8::Object;

using v8::Platform;

using v8::Task;

using node::tracing::TracingController;

struct PlatformWorkerData {

TaskQueue<Task>* task_queue;

Mutex* platform_workers_mutex;

ConditionVariable* platform_workers_ready;

int* pending_platform_workers;

int id;

};

static void BackgroundRunner(void* data) {

std::unique_ptr<PlatformWorkerData>

worker_data(static_cast<PlatformWorkerData*>(data));

TRACE_EVENT_METADATA1("__metadata", "thread_name", "name",

"BackgroundTaskRunner");

// Notify the main thread that the platform worker is ready.

{

Mutex::ScopedLock lock(*worker_data->platform_workers_mutex);

(*worker_data->pending_platform_workers)--;

worker_data->platform_workers_ready->Signal(lock);

}

TaskQueue<Task>* background_tasks = worker_data->task_queue;

while (std::unique_ptr<Task> task = background_tasks->BlockingPop()) {

task->Run();

background_tasks->NotifyOfCompletion();

}

class BackgroundTaskRunner::DelayedTaskScheduler {

public:

explicit DelayedTaskScheduler(TaskQueue<Task>* tasks)

: pending_worker_tasks_(tasks) {}

std::unique_ptr<uv_thread_t> Start() {

auto start_thread = [](void* data) {

static_cast<DelayedTaskScheduler*>(data)->Run();

};

std::unique_ptr<uv_thread_t> t { new uv_thread_t() };

uv_sem_init(&ready_, 0);

CHECK_EQ(0, uv_thread_create(t.get(), start_thread, this));

uv_sem_wait(&ready_);

uv_sem_destroy(&ready_);

return t;

}

void PostDelayedTask(std::unique_ptr<Task> task, double delay_in_seconds) {

tasks_.Push(std::unique_ptr<Task>(new ScheduleTask(this, std::move(task),

delay_in_seconds)));

uv_async_send(&flush_tasks_);

}

void Stop() {

tasks_.Push(std::unique_ptr<Task>(new StopTask(this)));

uv_async_send(&flush_tasks_);

}

private:

void Run() {

TRACE_EVENT_METADATA1("__metadata", "thread_name", "name",

"WorkerThreadsTaskRunner::DelayedTaskScheduler");

loop_.data = this;

CHECK_EQ(0, uv_loop_init(&loop_));

flush_tasks_.data = this;

CHECK_EQ(0, uv_async_init(&loop_, &flush_tasks_, FlushTasks));

uv_sem_post(&ready_);

uv_run(&loop_, UV_RUN_DEFAULT);

CheckedUvLoopClose(&loop_);

}

static void FlushTasks(uv_async_t* flush_tasks) {

DelayedTaskScheduler* scheduler =

ContainerOf(&DelayedTaskScheduler::loop_, flush_tasks->loop);

while (std::unique_ptr<Task> task = scheduler->tasks_.Pop())

task->Run();

}

class StopTask : public Task {

public:

explicit StopTask(DelayedTaskScheduler* scheduler): scheduler_(scheduler) {}

void Run() override {

std::vector<uv_timer_t*> timers;

for (uv_timer_t* timer : scheduler_->timers_)

timers.push_back(timer);

for (uv_timer_t* timer : timers)

scheduler_->TakeTimerTask(timer);

uv_close(reinterpret_cast<uv_handle_t*>(&scheduler_->flush_tasks_),

[](uv_handle_t* handle) {});

}

private:

DelayedTaskScheduler* scheduler_;

};

class ScheduleTask : public Task {

public:

ScheduleTask(DelayedTaskScheduler* scheduler,

std::unique_ptr<Task> task,

double delay_in_seconds)

: scheduler_(scheduler),

task_(std::move(task)),

delay_in_seconds_(delay_in_seconds) {}

void Run() override {

uint64_t delay_millis =

static_cast<uint64_t>(delay_in_seconds_ + 0.5) * 1000;

std::unique_ptr<uv_timer_t> timer(new uv_timer_t());

CHECK_EQ(0, uv_timer_init(&scheduler_->loop_, timer.get()));

timer->data = task_.release();

CHECK_EQ(0, uv_timer_start(timer.get(), RunTask, delay_millis, 0));

scheduler_->timers_.insert(timer.release());

}

private:

DelayedTaskScheduler* scheduler_;

std::unique_ptr<Task> task_;

double delay_in_seconds_;

};

static void RunTask(uv_timer_t* timer) {

DelayedTaskScheduler* scheduler =

ContainerOf(&DelayedTaskScheduler::loop_, timer->loop);

scheduler->pending_worker_tasks_->Push(scheduler->TakeTimerTask(timer));

}

std::unique_ptr<Task> TakeTimerTask(uv_timer_t* timer) {

std::unique_ptr<Task> task(static_cast<Task*>(timer->data));

uv_timer_stop(timer);

uv_close(reinterpret_cast<uv_handle_t*>(timer), [](uv_handle_t* handle) {

delete reinterpret_cast<uv_timer_t*>(handle);

});

timers_.erase(timer);

return task;

}

uv_sem_t ready_;

TaskQueue<v8::Task>* pending_worker_tasks_;

TaskQueue<v8::Task> tasks_;

uv_loop_t loop_;

uv_async_t flush_tasks_;

std::unordered_set<uv_timer_t*> timers_;

};

BackgroundTaskRunner::BackgroundTaskRunner(int thread_pool_size) {

Mutex::ScopedLock lock(platform_workers_mutex_);

pending_platform_workers_ = thread_pool_size;

delayed_task_scheduler_.reset(

new DelayedTaskScheduler(&background_tasks_));

threads_.push_back(delayed_task_scheduler_->Start());

for (int i = 0; i < thread_pool_size; i++) {

PlatformWorkerData* worker_data = new PlatformWorkerData{

&background_tasks_, &platform_workers_mutex_,

&platform_workers_ready_, &pending_platform_workers_, i

};

std::unique_ptr<uv_thread_t> t { new uv_thread_t() };

if (uv_thread_create(t.get(), BackgroundRunner, worker_data) != 0)

break;

threads_.push_back(std::move(t));

}

// Wait for platform workers to initialize before continuing with the

// bootstrap.

while (pending_platform_workers_ > 0) {

platform_workers_ready_.Wait(lock);

}

void BackgroundTaskRunner::PostTask(std::unique_ptr<Task> task) {

background_tasks_.Push(std::move(task));

}

void BackgroundTaskRunner::PostIdleTask(std::unique_ptr<v8::IdleTask> task) {

UNREACHABLE();

}

void BackgroundTaskRunner::PostDelayedTask(std::unique_ptr<v8::Task> task,

double delay_in_seconds) {

delayed_task_scheduler_->PostDelayedTask(std::move(task), delay_in_seconds);

}

void BackgroundTaskRunner::BlockingDrain() {

background_tasks_.BlockingDrain();

}

void BackgroundTaskRunner::Shutdown() {

background_tasks_.Stop();

delayed_task_scheduler_->Stop();

for (size_t i = 0; i < threads_.size(); i++) {

CHECK_EQ(0, uv_thread_join(threads_[i].get()));

}

size_t BackgroundTaskRunner::NumberOfAvailableBackgroundThreads() const {

return threads_.size();

}

PerIsolatePlatformData::PerIsolatePlatformData(

v8::Isolate* isolate, uv_loop_t* loop)

: loop_(loop) {

flush_tasks_ = new uv_async_t();

CHECK_EQ(0, uv_async_init(loop, flush_tasks_, FlushTasks));

flush_tasks_->data = static_cast<void*>(this);

uv_unref(reinterpret_cast<uv_handle_t*>(flush_tasks_));

}

void PerIsolatePlatformData::FlushTasks(uv_async_t* handle) {

auto platform_data = static_cast<PerIsolatePlatformData*>(handle->data);

platform_data->FlushForegroundTasksInternal();

}

void PerIsolatePlatformData::PostIdleTask(std::unique_ptr<v8::IdleTask> task) {

UNREACHABLE();

}

void PerIsolatePlatformData::PostTask(std::unique_ptr<Task> task) {

CHECK_NE(flush_tasks_, nullptr);

foreground_tasks_.Push(std::move(task));

uv_async_send(flush_tasks_);

}

void PerIsolatePlatformData::PostDelayedTask(

std::unique_ptr<Task> task, double delay_in_seconds) {

CHECK_NE(flush_tasks_, nullptr);

std::unique_ptr<DelayedTask> delayed(new DelayedTask());

delayed->task = std::move(task);

delayed->platform_data = shared_from_this();

delayed->timeout = delay_in_seconds;

foreground_delayed_tasks_.Push(std::move(delayed));

uv_async_send(flush_tasks_);

}

PerIsolatePlatformData::~PerIsolatePlatformData() {

Shutdown();

}

void PerIsolatePlatformData::Shutdown() {

if (flush_tasks_ == nullptr)

return;

while (FlushForegroundTasksInternal()) {}

CancelPendingDelayedTasks();

uv_close(reinterpret_cast<uv_handle_t*>(flush_tasks_),

[](uv_handle_t* handle) {

delete reinterpret_cast<uv_async_t*>(handle);

});

flush_tasks_ = nullptr;

}

void PerIsolatePlatformData::ref() {

ref_count_++;

}

int PerIsolatePlatformData::unref() {

return --ref_count_;

}

NodePlatform::NodePlatform(int thread_pool_size,

TracingController* tracing_controller) {

if (tracing_controller) {

tracing_controller_ = tracing_controller;

} else {

tracing_controller_ = new TracingController();

}

background_task_runner_ =

std::make_shared<BackgroundTaskRunner>(thread_pool_size);

}

void NodePlatform::RegisterIsolate(IsolateData* isolate_data, uv_loop_t* loop) {

Isolate* isolate = isolate_data->isolate();

Mutex::ScopedLock lock(per_isolate_mutex_);

std::shared_ptr<PerIsolatePlatformData> existing = per_isolate_[isolate];

if (existing) {

CHECK_EQ(loop, existing->event_loop());

existing->ref();

} else {

per_isolate_[isolate] =

std::make_shared<PerIsolatePlatformData>(isolate, loop);

}

void NodePlatform::UnregisterIsolate(IsolateData* isolate_data) {

Isolate* isolate = isolate_data->isolate();

Mutex::ScopedLock lock(per_isolate_mutex_);

std::shared_ptr<PerIsolatePlatformData> existing = per_isolate_[isolate];

CHECK(existing);

if (existing->unref() == 0) {

existing->Shutdown();

per_isolate_.erase(isolate);

}

void NodePlatform::Shutdown() {

background_task_runner_->Shutdown();

{

Mutex::ScopedLock lock(per_isolate_mutex_);

per_isolate_.clear();

}

size_t NodePlatform::NumberOfAvailableBackgroundThreads() {

return background_task_runner_->NumberOfAvailableBackgroundThreads();

}

void PerIsolatePlatformData::RunForegroundTask(std::unique_ptr<Task> task) {

Isolate* isolate = Isolate::GetCurrent();

HandleScope scope(isolate);

Environment* env = Environment::GetCurrent(isolate);

InternalCallbackScope cb_scope(env, Local<Object>(), { 0, 0 },

InternalCallbackScope::kAllowEmptyResource);

task->Run();

}

void PerIsolatePlatformData::DeleteFromScheduledTasks(DelayedTask* task) {

auto it = std::find_if(scheduled_delayed_tasks_.begin(),

scheduled_delayed_tasks_.end(),

[task](const DelayedTaskPointer& delayed) -> bool {

return delayed.get() == task;

});

CHECK_NE(it, scheduled_delayed_tasks_.end());

scheduled_delayed_tasks_.erase(it);

}

void PerIsolatePlatformData::RunForegroundTask(uv_timer_t* handle) {

DelayedTask* delayed = static_cast<DelayedTask*>(handle->data);

RunForegroundTask(std::move(delayed->task));

delayed->platform_data->DeleteFromScheduledTasks(delayed);

}

void PerIsolatePlatformData::CancelPendingDelayedTasks() {

scheduled_delayed_tasks_.clear();

}

void NodePlatform::DrainBackgroundTasks(Isolate* isolate) {

std::shared_ptr<PerIsolatePlatformData> per_isolate = ForIsolate(isolate);

do {

// Right now, there is no way to drain only background tasks associated

// with a specific isolate, so this sometimes does more work than

// necessary. In the long run, that functionality is probably going to

// be available anyway, though.

background_task_runner_->BlockingDrain();

} while (per_isolate->FlushForegroundTasksInternal());

}

bool PerIsolatePlatformData::FlushForegroundTasksInternal() {

bool did_work = false;

while (std::unique_ptr<DelayedTask> delayed =

foreground_delayed_tasks_.Pop()) {

did_work = true;

uint64_t delay_millis =

static_cast<uint64_t>(delayed->timeout + 0.5) * 1000;

delayed->timer.data = static_cast<void*>(delayed.get());

uv_timer_init(loop_, &delayed->timer);

// Timers may not guarantee queue ordering of events with the same delay if

// the delay is non-zero. This should not be a problem in practice.

uv_timer_start(&delayed->timer, RunForegroundTask, delay_millis, 0);

uv_unref(reinterpret_cast<uv_handle_t*>(&delayed->timer));

scheduled_delayed_tasks_.emplace_back(delayed.release(),

[](DelayedTask* delayed) {

uv_close(reinterpret_cast<uv_handle_t*>(&delayed->timer),

[](uv_handle_t* handle) {

delete static_cast<DelayedTask*>(handle->data);

});

}

// Move all foreground tasks into a separate queue and flush that queue.

// This way tasks that are posted while flushing the queue will be run on the

// next call of FlushForegroundTasksInternal.

std::queue<std::unique_ptr<Task>> tasks = foreground_tasks_.PopAll();

while (!tasks.empty()) {

std::unique_ptr<Task> task = std::move(tasks.front());

tasks.pop();

did_work = true;

RunForegroundTask(std::move(task));

}

return did_work;

}

void NodePlatform::CallOnBackgroundThread(Task* task,

ExpectedRuntime expected_runtime) {

background_task_runner_->PostTask(std::unique_ptr<Task>(task));

}

std::shared_ptr<PerIsolatePlatformData>

NodePlatform::ForIsolate(Isolate* isolate) {

Mutex::ScopedLock lock(per_isolate_mutex_);

std::shared_ptr<PerIsolatePlatformData> data = per_isolate_[isolate];

CHECK(data);

return data;

}

void NodePlatform::CallOnForegroundThread(Isolate* isolate, Task* task) {

ForIsolate(isolate)->PostTask(std::unique_ptr<Task>(task));

}

void NodePlatform::CallDelayedOnForegroundThread(Isolate* isolate,

Task* task,

double delay_in_seconds) {

ForIsolate(isolate)->PostDelayedTask(

std::unique_ptr<Task>(task), delay_in_seconds);

}

bool NodePlatform::FlushForegroundTasks(v8::Isolate* isolate) {

return ForIsolate(isolate)->FlushForegroundTasksInternal();

}

void NodePlatform::CancelPendingDelayedTasks(v8::Isolate* isolate) {

ForIsolate(isolate)->CancelPendingDelayedTasks();

}

bool NodePlatform::IdleTasksEnabled(Isolate* isolate) { return false; }

std::shared_ptr<v8::TaskRunner>

NodePlatform::GetBackgroundTaskRunner(Isolate* isolate) {

return background_task_runner_;

}

std::shared_ptr<v8::TaskRunner>

NodePlatform::GetForegroundTaskRunner(Isolate* isolate) {

return ForIsolate(isolate);

}

double NodePlatform::MonotonicallyIncreasingTime() {

// Convert nanos to seconds.

return uv_hrtime() / 1e9;

}

double NodePlatform::CurrentClockTimeMillis() {

return SystemClockTimeMillis();

}

TracingController* NodePlatform::GetTracingController() {

return tracing_controller_;

}

template <class T>

TaskQueue<T>::TaskQueue()

: lock_(), tasks_available_(), tasks_drained_(),

outstanding_tasks_(0), stopped_(false), task_queue_() { }

template <class T>

void TaskQueue<T>::Push(std::unique_ptr<T> task) {

Mutex::ScopedLock scoped_lock(lock_);

outstanding_tasks_++;

task_queue_.push(std::move(task));

tasks_available_.Signal(scoped_lock);

}

template <class T>

std::unique_ptr<T> TaskQueue<T>::Pop() {

Mutex::ScopedLock scoped_lock(lock_);

if (task_queue_.empty()) {

return std::unique_ptr<T>(nullptr);

}

std::unique_ptr<T> result = std::move(task_queue_.front());

task_queue_.pop();

return result;

}

template <class T>

std::unique_ptr<T> TaskQueue<T>::BlockingPop() {

Mutex::ScopedLock scoped_lock(lock_);

while (task_queue_.empty() && !stopped_) {

tasks_available_.Wait(scoped_lock);

}

if (stopped_) {

return std::unique_ptr<T>(nullptr);

}

std::unique_ptr<T> result = std::move(task_queue_.front());

task_queue_.pop();

return result;

}

template <class T>

void TaskQueue<T>::NotifyOfCompletion() {

Mutex::ScopedLock scoped_lock(lock_);

if (--outstanding_tasks_ == 0) {

tasks_drained_.Broadcast(scoped_lock);

}

template <class T>

void TaskQueue<T>::BlockingDrain() {

Mutex::ScopedLock scoped_lock(lock_);

while (outstanding_tasks_ > 0) {

tasks_drained_.Wait(scoped_lock);

}

template <class T>

void TaskQueue<T>::Stop() {

Mutex::ScopedLock scoped_lock(lock_);

stopped_ = true;

tasks_available_.Broadcast(scoped_lock);

}

template <class T>

std::queue<std::unique_ptr<T>> TaskQueue<T>::PopAll() {

Mutex::ScopedLock scoped_lock(lock_);

std::queue<std::unique_ptr<T>> result;

result.swap(task_queue_);

return result;

}

} // namespace node

node/src/node_platform.cc at fix/888923 · ofrobots/node · GitHub

Expand file tree

Breadcrumbs

node_platform.cc

Latest commit

History

Breadcrumbs

node_platform.cc

File metadata and controls