Hi, Let us consider following execution sequence: 1. "io_service" destructor calls "io_service::service::shutdown_service"; 2. documentation of "io_service::service::shutdown_service" says that it should destroy all user defined handler objects. Is it true that user defined handler objects may access to (e.g. post a handler) that "io_service" being destroyed and therefore has not exist already? Could You please also clarify me what does "user defined handler object" really mean? Thanks, Andrew.

Hi, Andrew For your 2nd question "user defined handler object", I supposed that the parameter for the io_service::post() which is kinda "user defined handler object". 1st, it could be a handler like "bind(&fun, this, _1, _2)". Martin