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    • 3. 发明授权
    • Change log historian system for memory shared by multiple workstations
    • 更改由多个工作站共享的内存的日志历史记录系统
    • US5943675A
    • 1999-08-24
    • US719672
    • 1996-09-25
    • Michael J. KeithMohammad S. KhanVictor J. GriswoldDavid A. Johnston
    • Michael J. KeithMohammad S. KhanVictor J. GriswoldDavid A. Johnston
    • G06F12/08G06F17/30
    • G06F12/0815G06F12/0813Y10S707/99952
    • A communication-efficient change log historian allows workstations having images of a shared memory to remain correlated to the shared memory. The system comprises one or more workstations connected to a microprocessor-based device which includes a memory device. The memory device includes the shared memory, and also stores a memory change list and a memory change index. The memory change list forms a list of changes which have been made to the information stored in the shared memory area, and the change index is indicative of the location of the most recent entry to the memory change list. The workstations maintain an image of the shared memory area, and store workstation change indexes which are indicative of the most recent entry to the memory change list which has also been implemented to respective images of the shared memory area in the workstations. The workstation regularly compares the workstation change index with the memory change index, thereby permitting the workstation image to be dynamically correlated with the shared memory. Advantageously, the system implements updates only when the contents of the shared memory have changed, and updates only those portions of the shared memory which have changed. The system also allows for the dynamic correlation of the workstation image with the shared memory, and allows the microprocessor-based device to be a passive participant in this process.
    • 通信高效的更改日志历史记录器允许具有共享存储器的图像的工作站保持与共享存储器相关。 该系统包括连接到基于微处理器的设备的一个或多个工作站,其包括存储器设备。 存储器件包括共享存储器,并且还存储存储器更改列表和存储器改变索引。 存储器更改列表形成对存储在共享存储器区域中的信息的改变的列表,并且改变索引表示最近条目到存储器改变列表的位置。 工作站保持共享存储器区域的图像,并且将工作站变更索引存储在工作站中的共享存储器区域的各个图像上,将工作站变更索引存储到存储器更改列表中。 工作站定期将工作站变化索引与存储器变化索引进行比较,从而允许工作站映像与共享存储器动态相关。 有利地,系统仅在共享存储器的内容已经改变时实现更新,并且仅更新已经改变的共享存储器的那些部分。 该系统还允许工作站图像与共享存储器的动态相关性,并且允许基于微处理器的设备在该过程中被动参与者。