print_stack Subroutine

   SUBROUTINE print_stack(unit_nr)
      !! Print current routine stack
      INTEGER, INTENT(IN)                                :: unit_nr

      INTEGER                                            :: i
      TYPE(callstack_entry_type)                         :: cs_entry
      TYPE(routine_stat_type), POINTER                   :: r_stat
      TYPE(timer_env_type), POINTER                      :: timer_env

      ! catch edge cases where timer_env is not yet/anymore available
      IF (.NOT. list_isready(timers_stack)) &
         RETURN
      IF (list_size(timers_stack) == 0) &
         RETURN

      timer_env => list_peek(timers_stack)
      WRITE (unit_nr, '(/,A,/)') " ===== Routine Calling Stack ===== "
      DO i = list_size(timer_env%callstack), 1, -1
         cs_entry = list_get(timer_env%callstack, i)
         r_stat => list_get(timer_env%routine_stats, cs_entry%routine_id)
         WRITE (unit_nr, '(T10,I4,1X,A)') i, TRIM(r_stat%routineN)
      END DO
      CALL m_flush(unit_nr)

   END SUBROUTINE print_stack