KDB: a multi-threaded debugger for multi-threaded applications
SPDT '96 Proceedings of the SIGMETRICS symposium on Parallel and distributed tools
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It is frequently useful to debug a running software system in a production environment with a symbolic debugger without interfering with the operation of the system. The user of such a debugger may want to inspect data or trigger some data collecting operations whenever the running program hits an arbitrary address. Terminating or initiating the debugging session must also be transparent to users of the system. Debuggers available for Windows NT (or any debugger written with the Win32 debugging API) cannot detach from a running process without killing it, so they are unsuitable for debugging live systems. This paper presents the design of Gemini Lite, a debugger written without the Win32 debugger API, which has the capabilities needed to debug running production systems.