JPS5831015B2 - Data processing system with pseudo input/output device area - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a data processing system having a pseudo input/output device area, particularly a data processing system that advances processing while accessing file data stored on the input/output device. Data that is configured so that when accessed, a pseudo input/output device area prepared on the main storage device is accessed under the same processing mode, and for example, information communication between jobs or tasks can be performed using the pseudo input/output device area. It concerns a processing system.

Conventionally, all ledger files in banking systems, etc., have been stored on auxiliary storage devices (input/output devices), and data corresponding to which account exists in which location on which auxiliary storage device. has been defined.

However, especially in the case of online processing, it has become common practice to divide jobs or tasks (hereinafter referred to collectively as jobs for simplicity) to increase the degree of multiplicity and improve processing efficiency. Along with this, the so-called Seayard File concept has been adopted.

For example, if specific data consisting of The idea that it is something that does not exist has come to be adopted.

On the other hand, when multi-job processing is performed as described above, it is necessary to communicate information between the jobs.
Accessing the input/output device each time such a relatively small amount of data is exchanged increases processing time, which is undesirable.

In consideration of the above points, the present invention aims to prepare a pseudo input/output device area on the main memory so that a part of the main memory can be used in the same way as an input/output device. There is.

Therefore, the data processing system having the pseudo input/output device area of the present invention has a main storage device, a central processing unit,
In a data processing system that is equipped with one or more input/output devices and proceeds with processing while accessing a predetermined unit of file data stored on the input/output device, A pseudo input/output device area is created to store the file data of each unit, and a job control word is created corresponding to each job or task unit executed by the central processing unit, and the job control word allows the job to be executed. The present invention is characterized in that when the input/output device is accessed, the pseudo input/output device area on the main storage device is accessed under the same processing mode.

This will be explained below with reference to the drawings.

The figure shows the configuration of an embodiment of the present invention, in which 1 is a main storage device, 2 is a central processing unit which is shown as having the main storage device 1 built-in for convenience, 3 is an input/output device, and 4- 1 is a job to perform business distribution, 4-2 is a job to perform deposit processing, 4-3 is a job to perform currency exchange processing, and 5-1 is a job control word that corresponds to job 4-1. 5-2 is a job control word that is generated in response to job 4-2; 5-3 is a job control word that is generated in response to job 4-3; 6 is a pseudo input/output device area, 7 is a block corresponding area (or block), 8 is a record corresponding area (or record), and 9 is a job 4-1 that performs distribution in the main storage device 1
Each shows an example of information to be transmitted to other jobs via.

The job control word JCL that is created corresponding to each job has been created in the past, and for example, what kind of resources the corresponding job uses, what kind of processing the corresponding job performs, etc. It can be thought of as storing control words such as which auxiliary storage device is supported to use resources, and when the job in question proceeds with processing, it refers to the job control word and performs processing. It will be done like this.

In the case of the present invention, a pseudo input/output device area 6 is provided on the main storage device 1.
is prepared and defined so that the pseudo input/output device area 6 can be specified on the job control word.

That is, each job can access the pseudo input/output device area 6 in the same processing mode as the mode in which the input/output device 3 is accessed.

For example, in order for one job, for example 4-1, to specify and read one block 7 of the pseudo input/output device area 6 (same as the command for the normal input/output device, one or less is the same).
An AD macro is prepared, and a WRITE macro is similarly prepared for writing to one block 7.

In addition, in order to specify and read one record 8 constituting one block 8 of the pseudo input/output device area 60,
A macro is prepared, and similarly a PUT macro is prepared to write to one record 8.

Furthermore, while one job, for example 4-1, is accessing one block in the pseudo input/output device area 60 and proceeding with processing, a number of blocks are set to prevent another job, for example 4-2, from accessing the same block. A LOCK macro is prepared to prohibit blocks all at once.

A UNLOCK macro is prepared to release the prohibited state.

As described above, by creating the pseudo input/output device area 6 on the main storage device 1, it is used, for example, as follows.

As mentioned at the beginning of this specification, especially in the case of online processing, one process, for example, banking processing, is divided into multiple jobs, and the processing job 4-
1. Deposit processing job 4-2, which specializes in deposit processing.
Joff is a foreign exchange processing company that specializes in foreign exchange processing.
・The processing is performed separately.

If a deposit process is requested by specifying an account (ledger file A) made up of a terminal (not shown), the information 9 will be stored in job 4.
−1 is given.

The job 4-1 knows that it is, for example, "deposit processing" and refers to the job control word 5-1 to transfer the information 9 to the deposit processing job 4-2. Write on one block corresponding area 7 in .

Job 4-1 then instructs job 4-2 to that effect.

In the above, when job 4-1 writes to the pseudo input/output device area 6, job 4-1 first uses the LOCK macro to prohibit access from other jobs to the area including the block corresponding area, and then uses the WRITE macro. The above information is written in one block corresponding area 7, and then the access prohibition to the prohibited area is canceled by the UNLOCK macro.

The deposit processing job 4-2 is also configured to receive the information 9 from the pseudo input/output device area 6 based on instructions from the job 4-1.

That is, refer to the job control word 5-2, prohibit access from other jobs using the LOCK macro, and then read the READ command.
Read the above information 9 using the macro, then IJNL
The above access prohibition is canceled by the OCK macro.

Then, the bank 4-2 accesses the input/output device 3 based on the information 9, for example, the ledger file, and executes a predetermined deposit process.

That is, the deposit processing is executed by sequentially executing the LOCK macro, READ macro, process execution, WRITE macro, and UNLOCK macro as necessary.

Further, at this time, processing such as storing the recovery information on a drum (not shown) is performed.

After the job 4-2 executes the deposit processing, it notifies the terminal to that effect.

As described above, by preparing the pseudo input/output device area 6 on the main storage device 1 and defining the area 6 as one of the file storage media by the job control word, the pseudo input/output device area 6 can be used for jobs, for example. It can be used for mutual information communication.

By doing this, the processing speed can be significantly improved compared to the case where the input/output device 3 was accessed each time when communicating information between jobs as described above. Become.

In addition, when preparing the pseudo input/output device area 6 on the main storage device 1 as described above, it is necessary to maintain recovery information at substantially the same speed as the access speed to the main storage device 1, and It is necessary to ensure that fault management and the like can be performed correctly, and although a detailed explanation will be omitted, it goes without saying that the above measures have been taken.

That is, it goes without saying that various processes performed in normal access processing to the input/output device 3 can be performed in the same manner.

As explained above, according to the present invention, by preparing the pseudo input/output device area 6 on the main storage device 1, processing that was conventionally performed while accessing the input/output device by directly using the main storage device can be performed. It becomes possible to execute.

In the above description, the pseudo input/output device area 6 is used for communicating information between jobs, but it goes without saying that the present invention is not limited to this.

[Brief explanation of the drawing]

The figure shows the configuration of an embodiment of the present invention. In the figure, 1 is the main memory, 2 is the central processing unit, 3 is the input/output device, 41, 4-2.4-3... are jobs, 51, 5-2.5-3, respectively. . . . represent job control words, and 6 represents a pseudo input/output device area.

Claims (1)

[Scope of Claims] 1. A computer comprising a main storage device, a central processing unit, and one or more input/output devices, and accessing predetermined units of file data stored on the input/output devices. In a data processing system that performs processing, a pseudo input/output device area is provided on the main storage device to store the predetermined unit of file data, and a pseudo input/output device area is provided to store the file data in the predetermined unit, and the area corresponds to the unit of job or task executed by the central processing unit. A job control word is generated, and the job control word is configured to access the pseudo input/output device area on the main storage device under the same processing mode when the job accesses the input/output device. A data processing system having a pseudo input/output device area characterized by: 2 When the job accesses the pseudo input/output device area defined by the job control word, the job prohibits access from other jobs to the contents of a predetermined range of the pseudo input/output device area, or 2. A data processing system having a pseudo input/output device area according to claim 1, wherein said data processing system is configured to perform a process of canceling access prohibition.