CONDITIONED SCALABLE NON-ZERO INDICATOR

• US 20100042997A1
• Filed: 08/28/2008
• Published: 02/18/2010
• Est. Priority Date: 08/18/2008
• Status: Abandoned Application

• Current Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Lev, Yosef, Olszewski, Marek K.
• Application Number:
  US12/200,206
• Publication Number:
  US 20100042997A1
• Time in Patent Office: Days
• US Class Current: 718/100
• CPC Class Codes: G06F 9/52 Program synchronisation; Mutual exclusion, e.g. by means of semaphores

Abstract

Apparatus, methods, and computer-program products are disclosed for performing an Arrive operation on a concurrent hierarchical Scalable Non-Zero Indicator (SNZI) object wherein the concurrent hierarchical SNZI object is a conditioned-SNZI (CSNZI) object that includes a parent CSNZI node. The method invokes a parent Arrive operation on the parent CSNZI node and returns an arrive failure status if the CSNZI object is disabled.

Claims

1. A computer-controlled method for performing an arrive operation on a concurrent hierarchical Scalable Non-Zero Indicator (SNZI) object, said method comprising:

invoking a first parent arrive operation on a parent conditioned-SNZI (CSNZI) node wherein said concurrent hierarchical SNZI object is a CSNZI object comprising said parent CSNZI node; and

returning an arrive failure status if said CSNZI object is disabled.

2. The computer-controlled method of claim 1, further comprising disabling said CSNZI object.

3. The computer-controlled method of claim 2, wherein said CSNZI object is incorporated by a readers-writer lock and disabling is responsive to acquiring said readers-writer lock by a writer.

4. The computer-controlled method of claim 2, further comprising invoking a disable operation on said CSNZI object, wherein disabling is responsive to whether said CSNZI object has a zero surplus.

5. The computer-controlled method of claim 1, further comprising enabling said CSNZI object.

6. The computer-controlled method of claim 5, further comprising:

invoking a second parent arrive operation on said parent CSNZI node; and

returning an arrive success status if said CSNZI object is enabled.

7. The computer-controlled method of claim 1, wherein said parent CSNZI node further comprises a depart operation, said method further comprising invoking said depart operation.

8. An apparatus having a processing unit and a memory coupled to said processing unit for performing an arrive operation on a concurrent hierarchical SNZI object in said memory, said apparatus comprising:

an invocation logic configured to invoke a parent arrive operation on a parent CSNZI node wherein said concurrent hierarchical SNZI object is a conditioned-SNZI object (CSNZI object) comprising said parent CSNZI node; and

a return logic, responsive to the invocation logic, configured to return an arrive failure status if said CSNZI object is disabled.

9. The apparatus of claim 8, further comprising a disable logic configured to disable said CSNZI object.

10. The apparatus of claim 9, wherein the invocation logic is responsive to a readers-writer lock logic, said readers-writer lock logic comprising a writer lock acquisition logic, and wherein the disable logic is responsive to said writer lock acquisition logic.

11. The apparatus of claim 8, further comprising an enable logic configured to enable said CSNZI object.

12. The apparatus of claim 11, wherein the return logic is configured to return an arrive success status if said CSNZI object is enabled.

13. The apparatus of claim 8, wherein said parent CSNZI node further comprises a parent depart operation and the invocation logic is further configured to invoke said parent depart operation.

14. A computer program product for performing an arrive operation on a concurrent hierarchical SNZI object, the product comprising:

a computer-usable data carrier providing instructions that, when executed by a computer, cause said computer to perform a method comprising;

invoking a first parent arrive operation on a parent CSNZI node wherein said concurrent hierarchical SNZI object is a conditioned-SNZI object (CSNZI object) comprising said parent CSNZI node; and

returning an arrive failure status if said CSNZI object is disabled.

15. The computer-program product of claim 14, further comprising disabling said CSNZI object.

16. The computer-program product of claim 15, wherein said CSNZI object is incorporated by a readers-writer lock and disabling is responsive to acquiring said readers-writer lock by a writer.

17. The computer-program product of claim 15, further comprising invoking a disable operation on said CSNZI object, wherein disabling is responsive to whether said CSNZI object has a zero surplus.

18. The computer-program product of claim 14, further comprising enabling said CSNZI object.

19. The computer-program product of claim 18, further comprising:

invoking a second parent arrive operation on said parent CSNZI node; and

returning an arrive success status if said CSNZI object is enabled.

20. The computer-program product of claim 14, wherein said parent CSNZI node further comprises a parent depart operation, said method further comprising invoking said parent depart operation.