| 摘要 |
PURPOSE:To simplify and quicken list processing, by recovering counters as unnecessary cells, which can not reflect the number of points from the cell and stack in the same page through examining the cells of non-zero. CONSTITUTION:A head address of a reference counter (RC) area of an objective page is set to a memory address register 13 to read out a memory, and the value of the RC stored in a memory readout data register 14 is checked at a zero detector 8. If the result is not zero, the register 13 is converted to the address of the cell corresponding to the RC via an address converter 10, the cell having the RC counter of non-zero in the objective page is taken as a start point, the cell of non-zero for the RC counter is sequentially led for marking processing. The cells of zero in mark bit not led is recovered as a gabbage cell and it is led to the free cell list of this page, the over-head of the RC counter is made small to make list processing simply and quickly. |
