id summary reporter owner description type status milestone component version severity resolution keywords cc 8861 boost 1.39 io_service_pool accept hangs bill 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