How can I interactively debug an application in real time?
Debugging a real-time application with dbx (or gdb) is usually tricky, because the debugger must attach to the process in real-time. Aside from the problem of hitting a moving target, hitting the target stops the process. With Aprobe, both problems are easily solved using a custom probe. The model for the probe is below, but an introduction to the concept is needed: The Aprobe solution is to write a probe which monitors for a reason to debug, and forks a copy of the real-time process when the monitor sees a need. The parent process then continues, while the copy stalls itself in the probe so dbx can attach to the copy.
