下面是我使用boost asio的套接字服务器的示例代码.
此服务器将在端口10001上等待任何客户端连接.当任何客户端连接时,它将启动线程从该客户端读取并等待另一个客户端.但是当我的客户端断开服务器套接字时,会发生什么事情在my_socket-> close()调用中挂起.
如果新客户端尝试连接服务器崩溃.
我在用
g(Ubuntu 4.4.3-4ubuntu5.1)4.4.3
#include <ctime> #include <iostream> #include <string> #include <boost/asio.hpp> #include <sys/socket.h> #include <unistd.h> #include <string> #include <boost/bind.hpp> #include <boost/thread.hpp> #include <boost/date_time.hpp> using namespace std; using boost::asio::ip::tcp; void run(boost::shared_ptr<tcp::socket> my_socket) { while (1) { char buf[128]; boost::system::error_code error; size_t len = my_socket->read_some(boost::asio::buffer(buf,128),error); std::cout << "len : " << len << std::endl; if (error == boost::asio::error::eof) { cout << "\t(boost::asio::error::eof)" << endl; if (my_socket->is_open()) { boost::system::error_code ec; cout << "\tSocket closing" << endl; my_socket->shutdown(boost::asio::ip::tcp::socket::shutdown_both,ec); cout << "\tShutdown " << ec.message() << endl; // cout << "normal close : " << ::close(my_socket->native_handle()) << endl; my_socket->close(ec); cout << "\tSocket closed" << endl; } break; // Connection closed cleanly by peer. } else if (error) { std::cout << "Exception : " << error.message() << std::endl; break; } else { for (unsigned int i = 0; i < len; i++) printf("%02x ",buf[i] & 0xFF); printf("\n"); } } } int main() { const int S = 1000; vector<boost::shared_ptr<boost::thread> > arr_thr(S); try { for (uint32_t i = 0;; i++) { boost::asio::io_service io_service; tcp::endpoint endpoint(tcp::v6(),10001); boost::shared_ptr<tcp::socket> my_socket(new tcp::socket(io_service)); tcp::endpoint end_type; tcp::acceptor acceptor(io_service,endpoint); std::cout << "before accept" << endl; acceptor.accept(*my_socket,end_type); std::cout << "connected... hdl : " << my_socket->native_handle() << std::endl; boost::asio::ip::address addr = end_type.address(); std::string sClientIp = addr.to_string(); std::cout << "\tclient IP : " << sClientIp << std::endl; arr_thr[i] = boost::shared_ptr<boost::thread>(new boost::thread(&run,my_socket)); } } catch (std::exception& e) { std::cerr << e.what() << std::endl; } return 0; }
解决方法
启动运行线程后,main中的for循环再次启动,销毁并重新初始化本地io_service变量,套接字上的下一个事件仍会假定旧的io_service对象,导致崩溃.
您应该只使用一个io_service实例.
另外,你应该看看boost :: asio提供的异步函数,比如async_accept和async_read,参见例如:http://www.boost.org/doc/libs/1_52_0/doc/html/boost_asio/example/chat/chat_server.cpp