Hi I'm implementing an application, serial RS232 communications centered, using boost in Windows. Many of the user actions are translated to ASCII commands to be sent to some serial devices connected to the serial ports, but as they are quite slow, I had to implement a command queue, so that as soon as a command gets its answer, it is cleared and the next one is sent, up to the end of the queue (of course). Using boost serial communication features, I realized that I needed an extra time-out, because the devices are real slow. So that this low speed doesn't lock up anything, the command queue runs in a separate thread and I would like another thread to run a timer, that could be activated when the command is send by the queue thread, and deactivated by the same thread if it detects an answer coming from the device in response to its command. If the timer is due, it should send a signal or call a callback function in the queue thread so it knows that the last command timed-out and it should re-send it again. All the queue things are OK (so it seems for now), I just need the timer. The ASIO timer is quite strange to me, I didn't manage to make it work. I have already seen the "timers" tutorials at boost web pages, and none have worked for me as expected. Any ideas / suggestions / snippets? Thanks a lot Francisco -- "If you have an apple and I have an apple and we exchange apples then you and I will still each have one apple. But if you have an idea and I have one idea and we exchange these ideas, then each of us will have two ideas." - George Bernard Shaw