boost 1.39 io_service_pool accept hangs

[bill <shuzhouliu@…>]

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.

[bill <shuzhouliu@…>]

Added the test harness and modification to the server2 example as an attachment