| 摘要 |
In Fig. 2 , a buffer 20 is provided with a leading pointer 44 and a following pointer 48. A bitmap in which two bits are assigned to each block is updated to retain which states blocks are in, busy, write-completed, or read-completed. Under the constraint that the two pointers move in the same direction and do not pass each other: after the block designated by the leading pointer 44 starts to be written, the leading pointer 44 is moved to a next block only if the next block is in the read-completed state; and after the block designated by the following pointer 48 starts to be read, the following pointer 48 is moved to a next block only if the next block is in the write-completed state. |
