Commits on Oct 22, 2024

1. add and use configuration write guard …

   the configuration write guard is now required when the configuration
   struct shall be mutated. the write guards locks multiple writers against
   each other and also, more importantly, makes the writes synchronous to
   the main loop. all code running in the main loop can now be sure that
   (1) reads from the configuration struct are non-preemtive and (2) the
   configuration struct as a whole is in a consistent state when reading
   from it.
   
   NOTE that acquiring a write guard from within the main loop's task will
   immediately cause a deadlock and the watchdog will trigger a reset. if
   writing from inside the main loop should ever become necessary, the
   write guard must be updated to only lock the mutex but not wait for a
   signal.

   

   schlimmchen committed Oct 22, 2024
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