Method _read_header

salt/utils/mmap_cache.py:927–932

Return (occupied, deleted, high_water_mark) from the header slot.

(self)

    # ------------------------------------------------------------------

    def _read_header(self):
        """Return (occupied, deleted, high_water_mark) from the header slot."""
        occupied = struct.unpack_from(_OFFSET_FMT, self._mm, _HDR_OCCUPIED_OFF)[0]
        deleted = struct.unpack_from(_OFFSET_FMT, self._mm, _HDR_DELETED_OFF)[0]
        hwm = struct.unpack_from(_OFFSET_FMT, self._mm, _HDR_HWM_OFF)[0]
        return occupied, deleted, hwm

    def _update_header(self, occupied_delta=0, deleted_delta=0, new_hwm=None):
        """Update header counters in-place."""