Does boost::asio::io_service preserve the order of handlers?

Question

Does boost::asio::io_service guarantee that handlers are called in the same order that they are given via post()? I can't find anything saying this in the documentation. Assume that calls to io_service::post are serialized.

Answer 1

The current implementation does execute things in the sequence you post them, but ordering is only guaranteed for handlers that are explicitly post()ed through a strand.

Answer 2

afaik if you want guaranteed ordering of post handler execution you have to use strand as described in the docs.