id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
8861	boost 1.39 io_service_pool accept hangs	bill <shuzhouliu@…>	chris_kohlhoff	"O.S.: Centos 5.4 64 bit
Boost version: 1.39
Symptom: With io_service-per-CPU and thread pool size 4, after the sever accepted at 8th connection, it cannot accept any connections afterwards.

How to reproduce it:
(1) Get the server2 example at http://www.boost.org/doc/libs/1_39_0/doc/html/boost_asio/example/http/server2/

(2) Modify connection.cpp to support persistent connection:
void connection::handle_write(const boost::system::error_code& e)
{
  if (!e)
  {
    // Initiate graceful connection closure.
    //boost::system::error_code ignored_ec;
    //socket_.shutdown(boost::asio::ip::tcp::socket::shutdown_both, ignored_ec);
    start();
  }

(3) Modify the server.cpp to use different acceptor_ constructor
server::server(const std::string& address, const std::string& port,
    const std::string& doc_root, std::size_t io_service_pool_size)
  : io_service_pool_(io_service_pool_size),
//    acceptor_(io_service_pool_.get_io_service()),
    acceptor_( io_service_pool_.get_io_service(),
           boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), atoi(port.c_str()))),

    new_connection_(new connection(
          io_service_pool_.get_io_service(), request_handler_)),

    request_handler_(doc_root)
{
  // Open the acceptor with the option to reuse the address (i.e. SO_REUSEADDR).

/*
  boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::tcp::v4(), 1025);
  acceptor_.open(endpoint.protocol());
  acceptor_.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
  acceptor_.bind(endpoint);
  acceptor_.listen();
*/
  acceptor_.async_accept(new_connection_->socket(),
      boost::bind(&server::handle_accept, this,
        boost::asio::placeholders::error));
}

(4) The client test harness create threads each second. In the thread, it will connect to the server, send a request and receive the response (both request/response should be small enough for one read/write). After that, the thread will sleep 1000 seconds without closing the connection.

(5) The server cannot accept any connections after 8th requests.


"	Bugs	new	To Be Determined	asio	Boost 1.39.0	Problem