src/executors.cpp: Comments regarding process_waiting.
src/executors.cpp: Comments regarding process_waiting.

  If the process gets set to status process_waiting, it *CANNOT*
    be touched afterwards, because it's possible for a race to
    develop where a worker makes the process process_waiting
    (which implicitly pushes it back into the queue), get
    suspended, then another worker wakes up that process and
    start fooling around with its state, get suspended itself,
    then the original worker fools around with the process.

AmkG/hl,AmkG/hl,AmkG/hl