连续两次 async_write 的问题

Question

当我调用 async_write 2 次时，第二条消息不会发送到服务器。在写入处理程序中，我调用 async_read 并且当我运行我的代码时，程序卡在读取状态。在连接处理程序中：

clientSocketPtr->lowest_layer().set_option(BA::ip::tcp::no_delay(true));
clientSocketPtr->set_verify_mode(BA::ssl::verify_peer);
clientSocketPtr->set_verify_callback(BA::ssl::host_name_verification(ADDRESS));
clientSocketPtr->handshake(ssl_socket::client);
//first call with first message(76 bytes)
BA::post(io_context, boost::bind(&ssd::write_msg, message, clientSocketPtr)); 
//some code here
//second call with another message(160 bytes)
BA::post(io_context, boost::bind(&ssd::write_msg, message, clientSocketPtr)); 

在 write_msg 中：

void ssd::write_msg(ssd::Message &msg, ssd::ssl_socket *clientSocketPtr) {
//some code here
BA::async_write(*clientSocketPtr, BA::buffer(buf, bufSize), BA::transfer_exactly(bufSize), boost::bind(&ssd::write_handler,
BA::placeholders::error, BA::placeholders::bytes_transferred, clientSocketPtr)); 
io_context.run();
}

在写处理程序中，我调用：

BA::post(io_context, boost::bind(&ssd::read_msg, clientSocketPtr));

在 read_msg 中，我调用 async_read。

输出为文本：

I20200818 11:17:38.633821  7417 message.hpp:53] 
Message type: 1
Message length: 70
Message: {"cli_type":"tarball","cli_version":"v2020.07.18","cmd":"cli_version"}
I20200818 11:17:38.637073  7417 sslconnection.cpp:77] Bytes sent: 76
I20200818 11:17:38.637115  7417 sslconnection.cpp:77] Bytes sent: 160
I20200818 11:17:38.640669  7417 sslconnection.cpp:109] Bytes recieved: 6
I20200818 11:17:38.640744  7417 sslconnection.cpp:122] Bytes recieved: 47
I20200818 11:17:38.640764  7417 sslconnection.cpp:128] 
Message length: 47
Message: {"cmd":"be_version","be_version":"v2020.07.15"}

Answer 1

你一次只能有一个async_write杰出的。请注意，async_write是根据 实现的async_write_some，并且两次写入可以交错。