发明授权
- 专利标题： System for exclusively controlling access of a semiconductor memory module using a backup memory and compression and decompression techniques
- 专利标题（中）： 使用备用存储器和压缩和解压缩技术专门控制半导体存储器模块访问的系统
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申请号： US261851申请日： 1994-06-16
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公开(公告)号： US5694619A公开(公告)日： 1997-12-02
- 发明人: Shigeo Konno
- 申请人： Shigeo Konno
- 申请人地址： JPX Kawasaki
- 专利权人： Fujitsu Limited
- 当前专利权人： Fujitsu Limited
- 当前专利权人地址： JPX Kawasaki
- 优先权： JPX5-232677 19930920
- 主分类号： G06F13/14
- IPC分类号： G06F13/14 ; G06F13/20 ; G06F7/32 ; G06F12/10
摘要：
Disclosed is an exclusive control method in an I/O subsystem having an exclusive controller which is provided with an exclusive control table and which permits a host interface to use the I/O device when the I/O device is not used by any other host interface while prohibiting the use when another host interface is using the I/O device. The method comprises the steps of: allotting a logical path number to each of the host interfaces of each of the input/output interface portions; Judging whether or not the I/O device is being used by another host interface by reference to the exclusive control table when a request for use of the I/O device is input from a host interface to which a predetermined logical path number is allotted; permitting the host interface which has required for access to use the I/O device when the I/O device is not in use, while setting a flag indicating that the I/O device is "Occupied" in the exclusive control table in correspondence with the allotted logical path number; and changing the flag to a flag indicating that the I/O device is "Vacant" when the use of the I/O device is finished.
公开/授权文献
- US4383763A Controllable mirrors 公开/授权日：1983-05-17
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