在使用Asio SSL库时,如果在同一时刻需要从套接字中读取和向套接字中写入数据,可能会遇到同步问题。这种情况通常发生在使用全双工套接字时。为了解决这个问题,可以使用Asio库提供的异步回调函数和同步操作来实现套接字的读写同步。
以下是一个示例代码:
#include
#include
#include
using asio::ip::tcp;
class Session : public std::enable_shared_from_this
{
public:
Session(asio::io_context& io_context, asio::ssl::context& context)
: socket_(io_context, context),
strand_(io_context),
read_in_progress_(false),
write_in_progress_(false)
{
}
void start(tcp::resolver::results_type endpoints)
{
// Connect to the server
asio::async_connect(socket_.lowest_layer(), endpoints,
strand_.wrap([this, self = shared_from_this()](std::error_code ec, tcp::endpoint)
{
if (!ec)
{
// Perform SSL handshake
socket_.async_handshake(asio::ssl::stream_base::client,
strand_.wrap([this, self](std::error_code ec)
{
if (!ec)
{
do_read();
}
else
{
std::cerr << "Handshake failed: " << ec.message() << "\n";
}
}));
}
else
{
std::cerr << "Connect failed: " << ec.message() << "\n";
}
}));
}
void write(const std::vector& data)
{
asio::post(strand_, [this, self = shared_from_this(), data]()
{
write_queue_.emplace_back(data);
if (!write_in_progress_)
{
do_write();
}
});
}
void close()
{
asio::post(strand_, [this, self = shared_from_this()]()
{
socket_.lowest_layer