ceph/src/boost/libs/asio/example/cpp03/http/server2/io_service_pool.cpp

   1 //
   2 // io_service_pool.cpp
   3 // ~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #include "server.hpp"
  12 #include <stdexcept>
  13 #include <boost/thread/thread.hpp>
  14 #include <boost/bind.hpp>
  15 #include <boost/shared_ptr.hpp>
  16
  17 namespace http {
  18 namespace server2 {
  19
  20 io_service_pool::io_service_pool(std::size_t pool_size)
  21   : next_io_service_(0)
  22 {
  23   if (pool_size == 0)
  24     throw std::runtime_error("io_service_pool size is 0");
  25
  26   // Give all the io_services work to do so that their run() functions will not
  27   // exit until they are explicitly stopped.
  28   for (std::size_t i = 0; i < pool_size; ++i)
  29   {
  30     io_service_ptr io_service(new boost::asio::io_service);
  31     work_ptr work(new boost::asio::io_service::work(*io_service));
  32     io_services_.push_back(io_service);
  33     work_.push_back(work);
  34   }
  35 }
  36
  37 void io_service_pool::run()
  38 {
  39   // Create a pool of threads to run all of the io_services.
  40   std::vector<boost::shared_ptr<boost::thread> > threads;
  41   for (std::size_t i = 0; i < io_services_.size(); ++i)
  42   {
  43     boost::shared_ptr<boost::thread> thread(new boost::thread(
  44           boost::bind(&boost::asio::io_service::run, io_services_[i])));
  45     threads.push_back(thread);
  46   }
  47
  48   // Wait for all threads in the pool to exit.
  49   for (std::size_t i = 0; i < threads.size(); ++i)
  50     threads[i]->join();
  51 }
  52
  53 void io_service_pool::stop()
  54 {
  55   // Explicitly stop all io_services.
  56   for (std::size_t i = 0; i < io_services_.size(); ++i)
  57     io_services_[i]->stop();
  58 }
  59
  60 boost::asio::io_service& io_service_pool::get_io_service()
  61 {
  62   // Use a round-robin scheme to choose the next io_service to use.
  63   boost::asio::io_service& io_service = *io_services_[next_io_service_];
  64   ++next_io_service_;
  65   if (next_io_service_ == io_services_.size())
  66     next_io_service_ = 0;
  67   return io_service;
  68 }
  69
  70 } // namespace server2
  71 } // namespace http