71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
//
|
|
// io_context_pool.cpp
|
|
// ~~~~~~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
//
|
|
|
|
#include "server.hpp"
|
|
#include <stdexcept>
|
|
#include <boost/thread/thread.hpp>
|
|
#include <boost/bind.hpp>
|
|
#include <boost/shared_ptr.hpp>
|
|
|
|
namespace http {
|
|
namespace server2 {
|
|
|
|
io_context_pool::io_context_pool(std::size_t pool_size)
|
|
: next_io_context_(0)
|
|
{
|
|
if (pool_size == 0)
|
|
throw std::runtime_error("io_context_pool size is 0");
|
|
|
|
// Give all the io_contexts work to do so that their run() functions will not
|
|
// exit until they are explicitly stopped.
|
|
for (std::size_t i = 0; i < pool_size; ++i)
|
|
{
|
|
io_context_ptr io_context(new boost::asio::io_context);
|
|
io_contexts_.push_back(io_context);
|
|
work_.push_back(boost::asio::make_work_guard(*io_context));
|
|
}
|
|
}
|
|
|
|
void io_context_pool::run()
|
|
{
|
|
// Create a pool of threads to run all of the io_contexts.
|
|
std::vector<boost::shared_ptr<boost::thread> > threads;
|
|
for (std::size_t i = 0; i < io_contexts_.size(); ++i)
|
|
{
|
|
boost::shared_ptr<boost::thread> thread(new boost::thread(
|
|
boost::bind(&boost::asio::io_context::run, io_contexts_[i])));
|
|
threads.push_back(thread);
|
|
}
|
|
|
|
// Wait for all threads in the pool to exit.
|
|
for (std::size_t i = 0; i < threads.size(); ++i)
|
|
threads[i]->join();
|
|
}
|
|
|
|
void io_context_pool::stop()
|
|
{
|
|
// Explicitly stop all io_contexts.
|
|
for (std::size_t i = 0; i < io_contexts_.size(); ++i)
|
|
io_contexts_[i]->stop();
|
|
}
|
|
|
|
boost::asio::io_context& io_context_pool::get_io_context()
|
|
{
|
|
// Use a round-robin scheme to choose the next io_context to use.
|
|
boost::asio::io_context& io_context = *io_contexts_[next_io_context_];
|
|
++next_io_context_;
|
|
if (next_io_context_ == io_contexts_.size())
|
|
next_io_context_ = 0;
|
|
return io_context;
|
|
}
|
|
|
|
} // namespace server2
|
|
} // namespace http
|