CA2522814A1 - Managing locks and transactions - Google Patents

Managing locks and transactions Download PDF

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Publication number
CA2522814A1
CA2522814A1 CA002522814A CA2522814A CA2522814A1 CA 2522814 A1 CA2522814 A1 CA 2522814A1 CA 002522814 A CA002522814 A CA 002522814A CA 2522814 A CA2522814 A CA 2522814A CA 2522814 A1 CA2522814 A1 CA 2522814A1
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Canada
Prior art keywords
resource
request
operation identifier
lock
locked
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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
CA002522814A
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French (fr)
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CA2522814C (en
Inventor
Michael Leo Walker
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International Business Machines Corp
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International Business Machines Corporation
Michael Leo Walker
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Priority to CA2677251A priority Critical patent/CA2677251C/en
Publication of CA2522814A1 publication Critical patent/CA2522814A1/en
Application granted granted Critical
Publication of CA2522814C publication Critical patent/CA2522814C/en
Active legal-status Critical Current
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Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00Arrangements for program control, e.g. control units
    • G06F9/06Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00Arrangements for program control, e.g. control units
    • G06F9/06Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/46Multiprogramming arrangements
    • G06F9/52Program synchronisation; Mutual exclusion, e.g. by means of semaphores
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00Arrangements for program control, e.g. control units
    • G06F9/06Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/46Multiprogramming arrangements
    • G06F9/466Transaction processing
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00Data processing: database and file management or data structures
    • Y10S707/99931Database or file accessing
    • Y10S707/99933Query processing, i.e. searching
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00Data processing: database and file management or data structures
    • Y10S707/99931Database or file accessing
    • Y10S707/99938Concurrency, e.g. lock management in shared database

Abstract

Disclosed is a method, system, and program for locking. A request is received with a first operation identifier to lock a first resource. The first resource is locked with the first operation identifier. It is determined whether a second resource should be locked with the first operation identifier or with a second operation identifier based on whether an operation to be performed for the request may complete after the request is processed.

Claims (12)

1. A method for locking, comprising:

receiving a request with a first operation identifier to lock a first resource;

locking the first resource with the first operation identifier; and determining whether a second resource should be locked with, the first operation identifier or with a second operation identifier based on whether an operation to be performed for the request may complete after the request is processed.
2. A system for locking, comprising:

a processor;

a computer readable medium accessible to the processor; and program logic including code capable of causing the processor to perform:

(i) receiving a request with a first operation identifier to lock a first resource;

(ii) locking the first resource with the first operation identifier; and (iii) determining whether a second resource should be locked with the first operation identifier or with a second operation identifier based on whether an operation to be performed for the request may complete after the request is processed.
3. An article of manufacture including program logic for locking, wherein the program logic causes operations to be performed, the operations comprising:

receiving a request with a first operation identifier to lock a first resource;

locking the first resource with the first operation identifier; and determining whether a second resource should be locked with the first operation identifier or with a second operation identifier based on whether an operation to be performed for the request may complete after the request is processed.
4. A system for locking, comprising:

an agent;

a first resource controlled by the agent;

a second resource not controlled by the agent;

means for receiving a request with a first operation identifier to lock the first resource;

means for locking the first resource with the first operation identifier; and means for determining whether the second resource should be locked with the first operation identifier or with a second operation identifier based on whether an operation to be performed for the request may complete after the request is processed.
5. A method for locking, comprising:

receiving a request to lock a resource with a first operation identifier;

determining whether the resource is locked with the first operation identifier;

if it is determined that the resource is locked with the first operation identifier, responding to the request with an indication that the resource is locked with the first operation identifier; and if it is determined that the resource is locked with a second operation identifier, denying the lock request.
6. A system for locking, comprising:

a processor;

a computer readable medium accessible to the processor; and program logic including code capable of causing the processor to perform:

(i) receiving a request to lock a resource with a first operation identifier;

(ii) determining whether the resource is locked with the first operation identifier;

(iii) if it is determined that the resource is locked with the first operation identifier, responding to the request with an indication that the resource is locked with the first operation identifier; and (iv) if it is determined that the resource is locked with a second operation identifier, denying the lock request.
7. An article of manufacture including program logic for locking, wherein the program logic causes operations to be performed, the operations comprising:

receiving a request to lock a resource with a first operation identifier;

determining whether the resource is locked with the first operation identifier;

if it is determined that the resource is locked with the first operation identifier, responding to the request with an indication that the resource is locked with the first operation identifier; and if it is determined that the resource is locked with a second operation identifier, denying the lock request.
8. A system for locking, comprising:

means for receiving a request to lock a resource with a first operation identifier;

means for determining whether the resource is locked with the first operation identifier by matching the first operation identifier against an operation identifier used to lock the resource;

means for, if it is determined that the resource is locked with the first operation identifier, responding to the request with an indication that the resource is locked with the first operation identifier; and means for, if it is determined that the resource is locked with a second operation identifier, denying the lock request.
9. A method for deadlock management comprising:

receiving an indication of refusal of a lock request with a first operation identifier for a resource that is locked with a second operation identifier;

placing the lock request in a queue with a lock queue timeout period; and reissuing the lock request if the lock request reaches a position of the queue from which the lock request may be processed within the lock queue timeout period.
10. A system for deadlock management, comprising:

a processor;

a computer readable medium accessible to the processor; and program logic including code capable of causing the processor to perform:

(i) receiving an indication of refusal of a lock request with a first operation identifier for a resource that is locked with a second operation identifier;

(ii) placing the lock request in a queue with a lock queue timeout period; and (iii) reissuing the lock request if the lock request reaches a position of the queue from which the lock request may be processed within the lock queue timeout period.
11. An article of manufacture including program logic for deadlock management, wherein the program logic causes operations to be performed, the operations comprising:

receiving an indication of refusal of a lock request with a first operation identifier for a resource that is locked with a second operation .
identifier;

placing the lock request in a queue with a lock queue timeout period; and reissuing the lock request if the lock request reaches a position of the queue from which the lock request may be processed within the lock queue timeout period.
12. A system for deadlock management, comprising:

means for receiving an indication of refusal of a lock request with a first operation identifier for a resource that is locked with a second operation identifier;

means for placing the lock request in a queue with a lock queue timeout period;

means for, reissuing the lock request if the lock request reaches a position of the queue from which the lock request may be processed within the lock queue timeout period.
CA2522814A 2003-05-01 2004-05-04 Managing locks and transactions Active CA2522814C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2677251A CA2677251C (en) 2003-05-01 2004-05-04 Managing locks and transactions

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/428,758 US7496574B2 (en) 2003-05-01 2003-05-01 Managing locks and transactions
US10/428,758 2003-05-01
PCT/GB2004/001927 WO2004097632A2 (en) 2003-05-01 2004-05-04 Managing locks and transactions

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA2677251A Division CA2677251C (en) 2003-05-01 2004-05-04 Managing locks and transactions

Publications (2)

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CA2522814A1 true CA2522814A1 (en) 2004-11-11
CA2522814C CA2522814C (en) 2010-06-22

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CA2522814A Active CA2522814C (en) 2003-05-01 2004-05-04 Managing locks and transactions
CA2677251A Expired - Fee Related CA2677251C (en) 2003-05-01 2004-05-04 Managing locks and transactions

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US (4) US7496574B2 (en)
EP (1) EP1623322B1 (en)
JP (1) JP4543034B2 (en)
KR (1) KR100877319B1 (en)
CN (1) CN100422936C (en)
CA (2) CA2522814C (en)
TW (1) TWI322381B (en)
WO (1) WO2004097632A2 (en)

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