套接字从boost :: asio :: io_service迁移到另一个epoll循环

Question

I've a boost asio socket. after handshaking phase is over on my custom protocol. I want to take out the socket's native handle from io_service and put it in my own epoll based loop running on a different thread.

So after reading the last message of handshaking phase I am not invoking boost::asio::async_read . But taking the native handle and adding it to my own epoll loop.

But On the client side I get Broken Pipe Error.

I've tried to delay the client before it tries to write, but even when I delay several seconds It gets Broken Pipe. But in that delayed time there is supposed to be another reader on server side, which is the epoll loop.

void hc::common::connection::handle_read(hc::common::connection::state s, const boost::system::error_code& error, std::size_t bytes){
  hook_read(error, bytes);
  if(!error){
    switch(s){
      case header:
        _packet.parse_header();
        ............
        break;
      case body:
        bool keep_reading = available(); // virtual << here it returns false by the overridden method
        _packet.clear();
        if(keep_reading){
            boost::asio::async_read(_socket, 
                boost::asio::buffer(_packet.data(), hc::common::packet::header_length),
                boost::asio::transfer_at_least(hc::common::packet::header_length),
                boost::bind(&hc::common::connection::handle_read, shared_from_this(), header, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
        }
        break;
    }
  }
}

Answer 1

This is a design flaw in asio, it is too restricted. OS does not have such enforcement that a socket can only belong to one monitor, but the library enforce this. The proactor does not allow an OS socket handle to be detached from one socket than attach to another socket object. This is definitely infeasible.