[Boost-users] Timeout on read/write using Boost.Asio

Hi everyone I'm using boost asio to implement a tcp client in my project, and it is my first time of using asio. I need timeout when read/write on the socket and I found the solution of using async io plus a timer, if timeout, cancel the async io operation. My question is: the "cancel" call acutely cancel all the pending async operation, but only one of them is timeout. For example, there is a pending async read and a pending async write operation, only read is timeout, I do not want cancel write any way. Any suggestion of the solution? Or I' m wrong? Thanks