Registration of resources for commit procedures

• US 5,276,876 A
• Filed: 05/16/1990
• Issued: 01/04/1994
• Est. Priority Date: 05/16/1990
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Showalter, James M., Coleman, Andrew, Szczygielski, Thomas J., Stone, Richard L., Maslak, Barbara A. M., Henry, John A., Pruul, Edmond A., Vendryes, Mary E.
• Primary Examiner(s): Shaw, Gareth D.
• Assistant Examiner(s): KATBAB, ABDOLLAH
• Application Number:
  US07/525,939
• Time in Patent Office: 1,329 Days
• Field of Search: 395/650, 364/281.6, 364/281.4
• US Class Current: 718/104
• CPC Class Codes: G06F 9/466 Transaction processing

Abstract

A computer system provides registration of resource for synchronization point processing. Resources include file systems, data bases, and protected conversations. A resource becomes protected by the system when it is registered in the application'"'"'s execution environment. The execution environment includes but is not exclusive to the interactive environment. Accordingly the invention provides an efficient and uniform method for identification of protected resources. The registration facility is separate from the application. Thus, the users of applications, application program developers, system administrators and operators need not have to consider or design a registration facility but only involve the one provided. A protected resource manager, through its adapter, can modify, at any time, the registration information, either by adding missing information or by changing the existing information. A resource registers only for the work unit in which it wishes to participate. An application could have several work units. A resource can register for two work units in the application or two resources can register for a single work unit or both.

Claims

1. A computer system for executing an application program in an execution environment, said application program making a first set of work requests to read or update a first plurality of resources coupled to said execution environment, a second set of work requests to read or update a second plurality of said resources, a first request to commit said first set of work requests, and a second request to commit said second set of work requests, a period between a work request of the first set and the first commit request being at least partially concurrent with a period between a work request of the second set and the second commit request, said system comprising:

means for providing the execution environment;

means, executing in said execution environment, for coordinating a commit procedure for said first set of work requests and coordinating a commit procedure for said second set of work requests; and

a plurality of resource manager interface means, including means for coupling to respective managers of said resources, executing in said execution environment, and coupled to the coordinating means, each of said resource manager interface means for said first plurality of resources responding to the respective work request of said first set by registering the respective resource in a first work unit with said coordinating means and each of said resource manager interface means for said second plurality of resources responding to the respective work request of said second set by registering the respective resource in a second work unit with said coordinating means, said first and second work units being at least partially concurrent with each other; and

wherein

said coordinating means responds to said first request by said application program to commit said first set of work requests by determining from said registrations that said first plurality of resources are included in said first work unit and transmitting commit requests for said first plurality of resources and responds to said second request by said application program to commit said second work unit by determining from said registrations that said second plurality of resources are included in said second work unit and transmitting commit requests for said second plurality of resources.

2. A computer system as set forth in claim 1 further comprising:

means for providing a second execution environment; and

communication facility means for coupling the first said execution environment to the second execution environment; and

wherein

one of said resources comprises means for making a conversation between said application program executing in said first execution environment and a second application program executing in said second execution environment;

a work request of said first set requests that said conversation be established, said conversation causing an update of another resource coupled to said second execution environment; and

said coordinating means responds to said first commit request from the application program executing in said first execution environment by transmitting a commit request for said second application program to commit said update of said other resource.

3. A computer system as set forth in claim 1 wherein said coordinating means transmits each of the commit requests via the respective resource manager interface means.

4. A computer system as set forth in claim 1 wherein said first set of work requests includes a plurality of requests to update one of said resources, and said resource manager interface means for said one resource includes means for avoiding registration with said coordinating means for said one resource except for a first one of said plurality of work requests for said one resource.

5. A computer system as set forth in claim 1 wherein the resource manager interface means is responsive to a loss of coupling to the respective resource manager of a previously registered resource by deleting or invalidating the registration with said coordinating means.

6. A computer system as set forth in claim 1 wherein the resource manager interface means, includes means, responsive to a request from the respective resource manager, to unregister the respective resource from the respective work unit in said coordinating means.

7. A computer system as set forth in claim 1 wherein said coordinating means directs a two phase commit procedure for said first work unit.

8. A computer system as set forth in claim 1 further comprising an operating system for controlling execution of said application program and wherein said plurality of resource manager interface means and said coordinating means are all part of said operating system.

9. A method for executing an application program in an execution environment, said application program making a first set of work requests to read or update a first plurality of resources coupled to said execution environment, a second set of work requests to read or update a second plurality of said resources, a first request to commit said first set of work requests, and a second request to commit said second set of work requests, a period between a work request of the first set and the first commit request being at least partially concurrent with a period between a work request of the second set and the second commit request, said method comprising the steps of:

providing the execution environment;

establishing in said execution environment a coordinator for the first and second commit requests;

responding, in said execution environment to the work requests of said first set by registering said first plurality of resources in a first work unit with said coordinator;

responding to the work requests of said second set by registering said second plurality of resources in a second work unit with said coordinator, said first and second work units being at least partially concurrent with each other; and

said coordinator responding to said first request by said application program to commit said first set of work requests by determining from said registrations that said first plurality of resources are included in said first work unit and transmitting commit requests for said first plurality of resources;

said coordinator responding to said second request by said application program to commit said second work unit by determining from said registrations that said second plurality of resources are included in said second work unit and transmitting commit requests for said second plurality of resources.

10. A method as set forth in claim 9 further comprising the steps of:

providing a second execution environment; and

coupling the first said execution environment to the second execution environment; and

wherein

one of said resources comprises means for making a conversation between said application program executing in said first execution environment and a second application program executing in said second execution environment;

a work request of said first set requests that said conversation be established, said conversation causing an update of another resource coupled to said second execution environment; and

said coordinator responds to said first commit request from the application program executing in said first execution environment by transmitting a commit request for said second application program to commit said update of said other resource.

11. A method as set forth in claim 9 wherein said coordinator transmits each of the commit requests for the respective resource via a respective resource manager interface means which resides within said execution environment.

12. A method as set forth in claim 9 wherein said first set of work requests includes a plurality of requests to update one of said resources, and registration with said coordinator for said one resource is avoided except for a first one of said plurality of work requests for said one resource.

13. A method as set forth in claim 9 further comprising the step of deleting or invalidating registration of a previously registered resource with said coordinator when coupling to said resource is lost.

14. A method as set forth in claim 9 further comprising the step of unregistering a previously registered resource from the respective work unit in response to a request from a respective resource manager to unregister the resource from the respective work unit.

15. A method as set forth in claim 9 wherein said coordinator directs a two phase commit procedure for said first work unit.

16. A method as set forth in claim 9 wherein said coordinator is part of an operating system which controls execution of said application program.