Computer system and a method of monitoring transient data structures in a computer system
First Claim
1. In a computer system comprising a central processing unit, a memory unit, and input-output means, the central processing unit being connected to the memory unit to transmit data between the central processing unit and the memory unit, the input-output means being connected to the central processing unit to transmit data between the central processing unit and a multitude of user stations, the central processing unit including a control program to control operation of the computer system, to establish priority among the user stations and having a plurality of process modules to perform services for the user stations, wherein the user stations selectively obtain and release access to the computer system, each time one of the user stations obtains access to the computer system, the control program establishes in the computer system a respective one control block associated with said one user station, and the control program releases each control block from the memory unit when the user station associated with the control block releases access to the computer system, a method of operating the computer system comprising the steps of:
- the computer system,i) invoking one of the process modules to service one of the control blocks,ii) suspending operation of said one process module and invoking another of the process modules to control operation of the computer system,iii) establishing in the computer system a control block monitoring data field for said one control block,iv) indicating in said control block monitoring data field whether said one control block remains established,v) passing control of the computer system from said other process module back to said one process module,vi) searching the control block monitoring data field to determine whether said one control block remains established,vii) if said control block remains established, the computer system resuming operation of said one process module, andviii) if said one control block does not remain established, the computer system taking control of the computer system away from said one process module.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and system of monitoring data structures in a computer system. A control block is established when a user obtains access to the computer system and is released when the user releases access to the computer system. A control program is provided to control operation of the computer system, and the control program has a plurality of process modules to service the control blocks. The method comprises the steps of invoking one process module to service one control block, and temporarily suspending operation of that one process module and invoking another process module to control operation of the computer system. A monitoring unit is established to indicate whether that one control block remains established. When control of the computer system is passed from the other process module back to said one process module, the monitoring unit is searched to determine whether the one control block is still established. If that control block is still established, operation of the interrupted process module is resumed; however, if the one control block is not still established, control of the computer system is passed from the one process module to the control program.
-
Citations
15 Claims
-
1. In a computer system comprising a central processing unit, a memory unit, and input-output means, the central processing unit being connected to the memory unit to transmit data between the central processing unit and the memory unit, the input-output means being connected to the central processing unit to transmit data between the central processing unit and a multitude of user stations, the central processing unit including a control program to control operation of the computer system, to establish priority among the user stations and having a plurality of process modules to perform services for the user stations, wherein the user stations selectively obtain and release access to the computer system, each time one of the user stations obtains access to the computer system, the control program establishes in the computer system a respective one control block associated with said one user station, and the control program releases each control block from the memory unit when the user station associated with the control block releases access to the computer system, a method of operating the computer system comprising the steps of:
-
the computer system, i) invoking one of the process modules to service one of the control blocks, ii) suspending operation of said one process module and invoking another of the process modules to control operation of the computer system, iii) establishing in the computer system a control block monitoring data field for said one control block, iv) indicating in said control block monitoring data field whether said one control block remains established, v) passing control of the computer system from said other process module back to said one process module, vi) searching the control block monitoring data field to determine whether said one control block remains established, vii) if said control block remains established, the computer system resuming operation of said one process module, and viii) if said one control block does not remain established, the computer system taking control of the computer system away from said one process module. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method of operating a computer system comprising a central processing unit, a memory unit, and input-output means, the central processing unit being connected to the memory unit to transmit data between the central processing unit and the memory unit, the input-output means being connected to the central processing unit to transmit data between the central processing unit and a multitude of user stations, the central processing unit including a control program to control operation of the computer system, to establish priority among the user stations, and having a plurality of process modules to perform services for the user stations, wherein the user stations selectively obtain and release access to the computer system, the method comprising the steps of:
-
the computer system, i) establishing a plurality of control blocks in the memory unit of the computer system, each control block being established when one of the user stations obtain access to the computer system and being release when said one user station releases access to the computer system, ii) involving the process modules to service the control blocks, each invoked process module controlling operation of the computer system and being invoked to service one of the control blocks, iii) suspending operation of one of the process modules and invoking another of the process modules to control operation of the computer system, iv) repeating step (iii) a plurality of times, v) establishing a plurality of control block monitoring data fields in the computer system, each suspended process module being associated with a respective one of the control bock monitoring data fields, vi) indicating in the control block monitoring data field associated with each suspended process module, whether the control block being serviced by the suspended process module at the time operation thereof was suspended, remains established, vii) returning control of the computer system from one of the process modules to one of the previously suspended process modules, viii) repeating step vii) a plurality of times, ix) after each time control of the computer system is returned to one of the previously suspended process modules, 1) searching the control block monitoring data field associated with said one of the previously suspended process modules to determined whether the one control bock being serviced by said one of the previously suspended process modules at the time operation thereof was suspended, remains established, 2) if said one control bock remains established, resuming operation of said one of the previously suspended process modules, and 3) if said one control block does not remain established, the computer system taking control of the computer system away from said one of the previously suspended process modules. - View Dependent Claims (7, 8, 9, 10, 11)
-
-
12. A multiprogramming and multiprocessing computer system, comprising:
-
a central processing unit including a control program to control operation of the computer system; a main memory unit connected to the central processing unit to transmit data between the central processing unit and the main memory unit, and including a multitude of addressable memory blocks; and input-output means connected to the central processing unit to connect the computer system to, and to transmit data between the computer system and, a multitude of user stations, each user station having means to obtain and to release access to the computer system; the computer system further including i) means to form a group of the addressable memory blocks into a control block each time one of the user stations obtains access to the computer system and to release the group of addressable memory blocks of one of the control blocks when the user station, for which said one control block is formed, releases access to the computer system, ii) a plurality of process modules, iii) means to establish priority among the user stations, and to invoke the process modules to control operation of the computer system and to service the control blocks, wherein each time a process module is invoked, the process module services one of the control blocks, iv) means to suspend operation of each of the process modules and to subsequently return control of the computer system to previously suspended process modules, v) means to establish in the computer system, a control block monitor data field associated with each suspended process module, the control block monitor data field including means to indicate whether the control block which was being serviced by the associated process module, remains formed, vi) means to check the control block monitor data field associated with a given suspended process module when control of the computer system is returned to the given suspended process module, to determine whether the control bock, which was being serviced by the given suspended process module, remains formed, and viii) means to terminate operation of the given suspended process module if the control block, which was being serviced by the given suspended process module, has bene released. - View Dependent Claims (13, 14, 15)
-
Specification