Boost.Asio Asynchronous TCP client and multi-threading

Question

My application is a TCP client that closely resembles the Boost.Asio chat client example .

I'm adding a few separate threads that call chat_client::write. Does this mean I would have to add a locking mechanism to do_write or handle_write? is there any recommended method?

Answer 1

No, you do not need to lock it in that case (in general). The events will only be handled from threads that have an io_service running. If that is only one, no locking is required. post()'ing new messages to an io_service is already thread-safe from multiple calling threads.

In your specific example, you might want to take the chat_message by-value instead of by-reference, or it might go out of scope in the post()'ing thread before being used in the io_service thread.

Answer 2

如果由于共享资源或其他原因需要某种形式的锁定，则应该看看strands 。