Hello, I have a service thread and a monitor thread in my program. Currently I use pthread. The service send and receive data and process it by speech recognition and update DB. Service thread may be hung some where because of a unknown bug. So the service thread update its state to a global activity object. The monitor check the activity object every 30 seconds. If the state of service thread is not idle and the span between updating time and current time is larger than a threshold, then monitor considers service thread is hung and kill it and restart a new service thread. This implementation has at least two flaws. It can't discover thread in hung immediately. It's hard to provide a optimal threshold. Because speech recognition may take short or long time to process different data. I just started to use boost and read some sample code using boost thread. I'm wondering whether I can have a better solution by using boost thread and how to do it? Regards, Qihong