Is it thread safe to call async_send and async_receive at the same time?

问题

I understood that calling boost::asio::ip::tcp::socket::async_receive (or boost::asio::ip::tcp::socket::async_send) two times may result in a bad behavior.. Is it OK if i call boost::asio::ip::tcp::socket::async_recive and boost::asio::ip::tcp::socket::async_send at the same time?

I am going to have 2 or more threads running the boost::asio::run so you need to take that into account..

Thanks

回答1:

This has to be OK. How else would you perform full duplex async communications on a single service? You need a receive outstanding at all times for incoming data.

The Boost docs indicate only that each of async_read and async_write must be called serially. For example, for async_read:

The program must ensure that the stream performs no other read operations (such as async_read, the stream's async_read_some function, or any other composed operations that perform reads) until this operation completes.

The docs for socket are not specific on this point, it's true.

来源：https://stackoverflow.com/questions/4098455/is-it-thread-safe-to-call-async-send-and-async-receive-at-the-same-time