triton-client 0.2.0

// Copyright (c) 2020-2021, NVIDIA CORPORATION. All rights reserved.
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#include "triton/common/async_work_queue.h"

#include <condition_variable>
#include <deque>
#include <mutex>
#include <thread>
#include <vector>

namespace triton { namespace common {

AsyncWorkQueue::~AsyncWorkQueue()
{
  for (size_t cnt = 0; cnt < worker_threads_.size(); cnt++) {
    GetSingleton()->task_queue_.Put(nullptr);
  }
  for (const auto& worker_thread : worker_threads_) {
    worker_thread->join();
  }
}

AsyncWorkQueue*
AsyncWorkQueue::GetSingleton()
{
  static AsyncWorkQueue singleton;
  return &singleton;
}

Error
AsyncWorkQueue::Initialize(size_t worker_count)
{
  if (worker_count < 1) {
    return Error(
        Error::Code::INVALID_ARG,
        "Async work queue must be initialized with positive 'worker_count'");
  }
  static std::mutex init_mtx;
  std::lock_guard<std::mutex> lk(init_mtx);
  if (GetSingleton()->worker_threads_.size() == 0) {
    for (size_t cnt = 0; cnt < worker_count; cnt++) {
      GetSingleton()->worker_threads_.push_back(
          std::unique_ptr<std::thread>(new std::thread([] { WorkThread(); })));
    }
  } else {
    return Error(
        Error::Code::ALREADY_EXISTS,
        "Async work queue has been initialized with " +
            std::to_string(GetSingleton()->worker_threads_.size()) +
            " 'worker_count'");
  }

  return Error::Success;
}

size_t
AsyncWorkQueue::WorkerCount()
{
  return GetSingleton()->worker_threads_.size();
}

Error
AsyncWorkQueue::AddTask(std::function<void(void)>&& task)
{
  if (GetSingleton()->worker_threads_.size() == 0) {
    return Error(
        Error::Code::UNAVAILABLE,
        "Async work queue must be initialized before adding task");
  }
  GetSingleton()->task_queue_.Put(std::move(task));

  return Error::Success;
}

void
AsyncWorkQueue::WorkThread()
{
  while (true) {
    auto task = GetSingleton()->task_queue_.Get();
    if (task != nullptr) {
      task();
    } else {
      break;
    }
  }
}

void
AsyncWorkQueue::Reset()
{
  // Reconstruct the singleton to reset it
  GetSingleton()->~AsyncWorkQueue();
  new (GetSingleton()) AsyncWorkQueue();
}

}}  // namespace triton::common