node/src/node_platform.cc at test-https-req-split · BruceFletcher/node · GitHub

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#include "node_platform.h"

#include "node_internals.h"

#include "util.h"

namespace node {

using v8::HandleScope;

using v8::Isolate;

using v8::Local;

using v8::Object;

using v8::Platform;

using v8::Task;

using v8::TracingController;

static void FlushTasks(uv_async_t* handle) {

NodePlatform* platform = static_cast<NodePlatform*>(handle->data);

platform->FlushForegroundTasksInternal();

}

static void BackgroundRunner(void* data) {

TaskQueue<Task>* background_tasks = static_cast<TaskQueue<Task>*>(data);

while (Task* task = background_tasks->BlockingPop()) {

task->Run();

delete task;

background_tasks->NotifyOfCompletion();

}

NodePlatform::NodePlatform(int thread_pool_size, uv_loop_t* loop,

TracingController* tracing_controller)

: loop_(loop) {

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_));

if (tracing_controller) {

tracing_controller_.reset(tracing_controller);

} else {

TracingController* controller = new TracingController();

tracing_controller_.reset(controller);

}

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

uv_thread_t* t = new uv_thread_t();

if (uv_thread_create(t, BackgroundRunner, &background_tasks_) != 0) {

delete t;

break;

}

threads_.push_back(std::unique_ptr<uv_thread_t>(t));

}

void NodePlatform::Shutdown() {

background_tasks_.Stop();

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

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

}

// uv_run cannot be called from the time before the beforeExit callback

// runs until the program exits unless the event loop has any referenced

// handles after beforeExit terminates. This prevents unrefed timers

// that happen to terminate during shutdown from being run unsafely.

// Since uv_run cannot be called, this handle will never be fully cleaned

// up.

uv_close(reinterpret_cast<uv_handle_t*>(&flush_tasks_), nullptr);

}

size_t NodePlatform::NumberOfAvailableBackgroundThreads() {

return threads_.size();

}

static void RunForegroundTask(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();

delete task;

}

static void RunForegroundTask(uv_timer_t* handle) {

Task* task = static_cast<Task*>(handle->data);

RunForegroundTask(task);

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

delete reinterpret_cast<uv_timer_t*>(handle);

});

}

void NodePlatform::DrainBackgroundTasks() {

do {

background_tasks_.BlockingDrain();

} while (FlushForegroundTasksInternal());

}

bool NodePlatform::FlushForegroundTasksInternal() {

bool did_work = false;

while (auto delayed = foreground_delayed_tasks_.Pop()) {

did_work = true;

uint64_t delay_millis =

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

uv_timer_t* handle = new uv_timer_t();

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

uv_timer_init(loop_, handle);

// 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(handle, RunForegroundTask, delay_millis, 0);

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

delete delayed;

}

while (Task* task = foreground_tasks_.Pop()) {

did_work = true;

RunForegroundTask(task);

}

return did_work;

}

void NodePlatform::CallOnBackgroundThread(Task* task,

ExpectedRuntime expected_runtime) {

background_tasks_.Push(task);

}

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

foreground_tasks_.Push(task);

uv_async_send(&flush_tasks_);

}

void NodePlatform::CallDelayedOnForegroundThread(Isolate* isolate,

Task* task,

double delay_in_seconds) {

auto pair = new std::pair<Task*, double>(task, delay_in_seconds);

foreground_delayed_tasks_.Push(pair);

uv_async_send(&flush_tasks_);

}

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

double NodePlatform::MonotonicallyIncreasingTime() {

// Convert nanos to seconds.

return uv_hrtime() / 1e9;

}

TracingController* NodePlatform::GetTracingController() {

return tracing_controller_.get();

}

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(T* task) {

Mutex::ScopedLock scoped_lock(lock_);

outstanding_tasks_++;

task_queue_.push(task);

tasks_available_.Signal(scoped_lock);

}

template <class T>

T* TaskQueue<T>::Pop() {

Mutex::ScopedLock scoped_lock(lock_);

T* result = nullptr;

if (!task_queue_.empty()) {

result = task_queue_.front();

task_queue_.pop();

}

return result;

}

template <class T>

T* TaskQueue<T>::BlockingPop() {

Mutex::ScopedLock scoped_lock(lock_);

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

tasks_available_.Wait(scoped_lock);

}

if (stopped_) {

return nullptr;

}

T* result = 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);

}

} // namespace node

node/src/node_platform.cc at test-https-req-split · BruceFletcher/node · GitHub

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