|WP1 - RTOS State of the Art Analysis: Deliverable D1.1 - RTOS Analysis|
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Source level debugging using GDB directly from the same machine that is running the system. The debugging target system (RTLinux) and the host system (where GDB is running) are communicated with FIFOS.
It is possible to debug periodic threads (gdb command info threads) in the usual way: step by step, break points, inspect variable values, etc. Multiprocessor systems can be debugged. Also is possible to use graphical front-ends like: DDD, gvd, xxgdb, insight.
An optional tracer module can be included in the system. The tracer will register all the relevant system events and user-defined ones.
The builtin set of events includes RTLinux interrupt handlers entry and exit, scheduler entry and exit, spin-lock acquiring and freeing, context switches, interrupts disabling and enabling. It is possible to attach an arbitrary 32-bit value to each event record. The current value of instruction pointer is also logged with each event.
Events are grouped into classes. It is possible to select logging of events of any combination of different classes during runtime.
Events are logged in circular buffers located in shared memory, where a user-space program can collect and store in disk. This logging mechanism causes a minimal interference.