Method and apparatus for arbitrating access to selected computer system devices

• US 5,835,737 A
• Filed: 05/10/1996
• Issued: 11/10/1998
• Est. Priority Date: 05/10/1996
• Status: Expired due to Term

• Current Assignee: Apple Computer Incorporated (Apple Inc.)
• Original Assignee: Apple Computer Incorporated (Apple Inc.)
• Inventors: Sand, Jonathan, Knight, Holly, Sutton, Carl
• Primary Examiner(s): AUVE, GLENN ALLEN
• Application Number:
  US08/644,705
• Time in Patent Office: 914 Days
• Field of Search: 395/293, 395/287, 395/728, 395/729
• US Class Current: 710/113
• CPC Class Codes: G06F 13/14 Handling requests for interconnection or transfer
• CPC Class Codes: G06F 2209/522 Manager
• CPC Class Codes: G06F 9/5011 the resources being hardware resources other than CPUs, Servers and Terminals
• CPC Class Codes: G06F 9/526 Mutual exclusion algorithms

Abstract

A method and apparatus for arbitrating access to a selected device in a computer system comprises a routine for registering access rules for accessing the selected system device, a plurality of competing clients which may each request a connection to the selected device, and an arbitrator which uses the registered access rules to negotiate access to the requested connection on behalf of the competing clients.

Claims

1. An apparatus for arbitrating access to a selected device in a computer system, comprising:

a routine for registering connection rules for accessing said selected device;

a plurality of competing system clients each requesting a connection to said selected device; and

an arbitrator for granting said connection to selected ones of said plurality of competing system clients based upon said registered connection rule, said arbitrator being configured to distinguish between and among a plurality of connection options specified by said plurality of competing system clients and to grant said connection in accordance with the specified connection options.

2. The apparatus of claim 1 wherein said connection rules specify whether said selected ones of said plurality of competing system clients will relinquish said connection when requested.

3. The apparatus of claim 1 wherein said connection is always initially created in a dormant state and then is subsequently upgraded to an active state whenever said arbitrator grants said connection.

4. The apparatus of claim 1 wherein said arbitrator notifies said selected ones of said plurality of competing system clients whenever said connection is granted.

5. A method for arbitrating access to a selected system device in a computer system, comprising the steps of:

registering connection rules for accessing said selected device;

requesting a connection to said selected device for a plurality of competing system clients; and

granting said connection to one or more of said plurality of competing system clients based upon said registered connection rules, wherein said granting step includes distinguishing between and among a plurality of specified connection options and granting said connection in accordance therewith.

6. The method of claim 5 wherein said connection rules specify whether said one or more of said plurality of competing system clients will relinquish said connection when requested.

7. The method of claim 5 wherein said connection is initially created in a dormant state and then is subsequently upgraded to an active state whenever said arbitrator grants said connection.

8. The method of claim 6 further comprising the step of notifying said one or more of said plurality of competing system clients whenever said connection is granted.

9. A computer-readable medium containing instructions which cause a computer system to arbitrate access to a selected device by performing the steps of:

registering connection rules for accessing said selected device;

requesting a connection to said selected device for a plurality of competing system clients; and

granting said connection to one or more of said plurality of competing system clients based upon said registered connection rules, wherein said granting step includes distinguishing between and among a plurality of specified connection options and granting said connection in accordance therewith.

10. The computer-readable medium of claim 9 wherein said connection rules specify whether said one or more of said plurality of competing system clients will relinquish said connection when requested.

11. The computer-readable medium of claim 9 wherein said connection is initially created in a dormant state and then is subsequently upgraded to an active state whenever said arbitrator grants said connection.

12. The computer-readable medium of claim 9 further comprising the step of notifying said one or more of said plurality of competing system clients whenever said connection is granted.

13. An apparatus for arbitrating access to selected computer system devices, comprising:

means for registering connection rules for accessing said selected device;

means for requesting a connection to said selected device for a plurality of competing system clients; and

; and

means for granting said connection to one or more of said plurality of competing system clients based upon said registered connection rules, said means for granting said connection being configured to distinguish between and among a plurality of connection options specified by said plurality of competing system clients and to grant said connection in accordance with the specified connection options.

14. The apparatus of claim 13 wherein said connection rules specify whether said one or more of said plurality of competing system clients will yield said connection when requested.

15. The apparatus of claim 13 wherein said connection is initially created in a dormant state and then is subsequently upgraded to an active state whenever said connection is granted.

16. The apparatus of claim 13 wherein said means for granting notifies said one or more of said plurality of competing system clients whenever said connection is granted.

17. An apparatus for arbitrating access to a selected device in a computer system, comprising:

a routine for registering connection rules for accessing said selected device;

a plurality of competing system clients each requesting a connection to said selected device; and

an arbitrator for granting said connection to selected ones of said plurality of competing system clients based upon said registered connection rules;

wherein said routine includes a discrete access point which is registered to connect said selected ones of said plurality of said competing system clients with said selected device.

18. A method for arbitrating access to a selected system device in a computer system, comprising the steps of:

registering connection rules for accessing said selected device;

requesting a connection to said selected device for a plurality of competing system clients; and

granting said connection to one or more of said plurality of competing system clients based upon said registered connection rules;

wherein said step of registering is performed by a routine which also registers an ownership relationship between said routine and said selected device.

19. A computer-readable medium containing instructions which cause a computer system to arbitrate access to a selected device by performing the steps of:

registering connection rules for accessing said selected device;

requesting a connection to said selected device for a plurality of competing system clients; and

granting said connection to one or more of said plurality of competing system clients based upon said registered connection rules;

wherein said step of registering is performed by a routine which also registers an ownership relationship between said routine and said selected device.

20. An apparatus for arbitrating access to selected computer system devices, comprising:

means for registering connection rules for accessing said selected device;

means for requesting a connection to said selected device for a plurality of competing system clients; and

means for granting said connection to one or more of said plurality of competing system clients based upon said registered connection rules;

wherein said means for registering includes a discrete access point which is registered to connect said selected ones of said plurality of said competing system clients with said selected device.