我在我正在编写的应用程序中得到了这个代码片段:
#include "ClientSession.hpp"
void ClientSession::start(void)
{
auto Self(shared_from_this());
//boost::asio::read(this->_Socket, boost::asio::buffer(this->_ReadBuffer));
//this->_Socket.get_io_service().post(boost::bind(&ClientSession::on_read, shared_from_this(), boost::system::error_code::error_code(), 0));
boost::asio::async_read(this->_Socket, boost::asio::buffer(this->_ReadBuffer), boost::bind(&ClientSession::on_read, Self, _1, _2));
}
void ClientSession::on_read(const boost::system::error_code& Err_, size_t Bytes_)
{
try
{
if(Err_)
{
if(!(Err_ == boost::asio::error::eof || Err_ == boost::asio::error::connection_aborted))
{
throw std::runtime_error(Err_.message());
}
return;
}
}
catch(std::exception& Ex_)
{
this->_OutputHandler.write_error(Ex_.what());
}
}
调用 ClientSession::start 的代码是:
void Application::start_accept()
{
using namespace boost::asio;
ip::tcp::endpoint Endpoint( ip::address::from_string(this->_Config.get_client_login_server().first), this->_Config.get_client_login_server().second );
this->_ClientAcceptor.open(Endpoint.protocol());
this->_ClientAcceptor.bind(Endpoint);
this->_ClientAcceptor.listen();
std::shared_ptr<ClientSession> Session = ClientSession::create_new(this->_AsioService, this->_OutputHandler);
this->_ClientAcceptor.async_accept(Session->get_socket(), boost::bind(&Application::handle_accept, shared_from_this(), Session, _1));
}
如果我使用注释掉的行之一运行应用程序,它工作得很好(在 boost::asio::read 版本中,来自客户端的传输消息被写入读取缓冲区,并且在发布版本期间,处理函数被调用没有任何问题),但是如果尝试将我的应用程序与 async_read 部分一起使用,我的整个应用程序总是崩溃,没有调用完整的句柄或!甚至读取一个字节!,至少它看起来像 asio 给我的输出:
@asio|1373633560.834957|0*1|socket@000000BD603D46C0.async_accept @asio|1373633573.324144|>1|ex=system:0 @asio|1373633573.324144|1*2|socket@000000BD603DBAB8.async_reive
我将它调试到一个名为“select_reactor.ipp”的文件中,应用程序尝试在该文件中获取 boost::asio::detail::mutex::scoped_lock,看起来它在那里失败了,该方法的完整代码是:
void select_reactor::start_op(int op_type, socket_type descriptor,
select_reactor::per_descriptor_data&, reactor_op* op,
bool is_continuation, bool)
{
boost::asio::detail::mutex::scoped_lock lock(mutex_);
if (shutdown_)
{
post_immediate_completion(op, is_continuation);
return;
}
bool first = op_queue_[op_type].enqueue_operation(descriptor, op);
io_service_.work_started();
if (first)
interrupter_.interrupt();
}
我不知道我可能做错了什么,但我不知道是什么,我希望有人能给我一个提示,我能做些什么来解决这个错误。
根据我目前得到的评论,我将添加更完整的代码片段: 我的 io_service 在我的 Application 类中:
class Application
: public std::enable_shared_from_this<Application>
{
typedef boost::asio::io_service Service;
typedef boost::asio::ip::tcp::acceptor Acceptor;
public:
Application(void)
: _ClientAcceptor(_AsioService), _ApplicationRunning(true)
{
}
~Application(void);
/*
* This is the main method which starts the actual program routine
* called in main()
*/
int run(void);
private:
/*
* Invokes the first accept and then invokes via async. handle_accept, which invokes itself repeatedly
*/
void start_accept(void);
/*
* handle_accept calls NewClient_->start to invoke the communication with this client
*/
void handle_accept(std::shared_ptr<ClientSession> NewClient_, const boost::system::error_code& Err_);
void loop_for_user_input(void);
bool handle_user_input(const std::string& Msg_);
/*
* This method invokes the threads that call io_service::run()
*/
static void start_service(Service& AsioService_) { try { AsioService_.run(); } catch(const std::exception& Ex_) { std::cout << Ex_.what() << std::endl; } }
private:
Configuration _Config;
Service _AsioService;
Acceptor _ClientAcceptor;
OutputHandler _OutputHandler;
bool _ApplicationRunning;
};
和运行方法:
int Application::run(void)
{
try
{
this->_Config.load();
this->_OutputHandler.open(this->_Config.get_logs());
this->start_accept();
for(int i = 0; i < 4; i++)
{
std::thread t(start_service, std::ref(this->_AsioService));
t.detach();
}
this->loop_for_user_input();
}
catch(const std::runtime_error& Ex_)
{
this->_OutputHandler.write_error(Ex_.what());
}
return 0;
}