JPS56149657A - Exclusive control system for shared external storage - Google Patents

Exclusive control system for shared external storage

Info

Publication number
JPS56149657A
JPS56149657A JP5341680A JP5341680A JPS56149657A JP S56149657 A JPS56149657 A JP S56149657A JP 5341680 A JP5341680 A JP 5341680A JP 5341680 A JP5341680 A JP 5341680A JP S56149657 A JPS56149657 A JP S56149657A
Authority
JP
Japan
Prior art keywords
external storage
shared external
control
exclusive control
queuing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP5341680A
Other languages
Japanese (ja)
Other versions
JPS6043537B2 (en
Inventor
Mitsuru Sanagi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP55053416A priority Critical patent/JPS6043537B2/en
Publication of JPS56149657A publication Critical patent/JPS56149657A/en
Publication of JPS6043537B2 publication Critical patent/JPS6043537B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/14—Handling requests for interconnection or transfer
    • G06F13/16—Handling requests for interconnection or transfer for access to memory bus

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Abstract

PURPOSE:To reduce the occupied queuing time and to secure a highly efficient exclusive control, by reducing the occupied range of exclusive control for a shared external storage in an exclusive control system of a shared external storage which is connected to plural computer systems. CONSTITUTION:The system includes the reserve command control part 3, release command control part 4, sense command control part 5 and occupancy control table 6. These control parts 3, 4 and 5 gives a control via the table 6 to the queuing requirement of the using computer system and the queuing computer system to a shared external storage by means of the data of information on the computer system No. and the occupied data segment position. The unit of occupancy of exclusive control is set to a data segment smaller than the volume, and thus the queuing probability is reduced greatly for the computer that is going to give an access to the shared external storage.
JP55053416A 1980-04-22 1980-04-22 Exclusive control method for shared external storage devices Expired JPS6043537B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55053416A JPS6043537B2 (en) 1980-04-22 1980-04-22 Exclusive control method for shared external storage devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55053416A JPS6043537B2 (en) 1980-04-22 1980-04-22 Exclusive control method for shared external storage devices

Publications (2)

Publication Number Publication Date
JPS56149657A true JPS56149657A (en) 1981-11-19
JPS6043537B2 JPS6043537B2 (en) 1985-09-28

Family

ID=12942225

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55053416A Expired JPS6043537B2 (en) 1980-04-22 1980-04-22 Exclusive control method for shared external storage devices

Country Status (1)

Country Link
JP (1) JPS6043537B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58178455A (en) * 1982-04-14 1983-10-19 Hitachi Ltd Exclusive control system for shared file
JPS5977563A (en) * 1982-10-26 1984-05-04 Nec Corp File control processor
JPS59226959A (en) * 1983-06-07 1984-12-20 Nec Corp Shared file controller
JPS60100238A (en) * 1983-11-02 1985-06-04 Nec Corp Control system for shared file
JPH02113350A (en) * 1988-10-24 1990-04-25 Nec Corp File processor
JPH06103155A (en) * 1991-04-04 1994-04-15 Northern Telecom Ltd Method and device for controlling shared memory

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58178455A (en) * 1982-04-14 1983-10-19 Hitachi Ltd Exclusive control system for shared file
JPS5977563A (en) * 1982-10-26 1984-05-04 Nec Corp File control processor
JPS59226959A (en) * 1983-06-07 1984-12-20 Nec Corp Shared file controller
JPS60100238A (en) * 1983-11-02 1985-06-04 Nec Corp Control system for shared file
JPH02113350A (en) * 1988-10-24 1990-04-25 Nec Corp File processor
JPH06103155A (en) * 1991-04-04 1994-04-15 Northern Telecom Ltd Method and device for controlling shared memory

Also Published As

Publication number Publication date
JPS6043537B2 (en) 1985-09-28

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