JP2887488B2 - Multi-process processing equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-processing apparatus that executes various processes on a file simultaneously and in parallel.

[Summary] The present invention provides a multi-process processing apparatus as described above, in which a certain file is being executed by another process while a certain process is being executed on the file. When there is a change, such as file change, the fact is notified to the original process, and by executing a predetermined process corresponding to the file change, the file being processed is rewritten by another process at any time. The change processing can be performed.

2. Description of the Related Art Conventionally, a multi-process processing device that executes various processes on a file simultaneously and in parallel has been realized.

In this apparatus, when a process in which a certain process is being executed is changed by another process which is sequentially switched and concurrently executed, the file is updated based on the file contents before the file change. Adverse effects such as inconsistency in the processing results of the process that performed the processing
Alteration of all or part of the file during the execution of the process by another process has been prohibited.

[Problems to be Solved by the Invention] Therefore, the advantage of the multi-process processing apparatus that the processing can be speeded up has not been fully utilized.

This is because each running process can only execute its own process independently of each other, cannot know each other's process of changing the same file by another process, and cannot execute the process corresponding to the change. to cause.

Then, if a change process is performed on a file that is executing a process, if the process can be notified to other processes that are simultaneously executing and the process that handles the change process can be executed, Obviously, the modification of the running file by another process can be performed concurrently.

An object of the present invention is to provide a process for coping with a change in a file in which a certain process is being executed by another process executing concurrently with the process when the file is changed. The object of the present invention is to enable a process that has performed processing based on the file contents before the change processing.

[Means for Solving the Problems] The means of the present invention are as follows.

This apparatus switches a plurality of processes sequentially and processes them concurrently in parallel. The first storage means a (see the functional block diagram of FIG. 1,
Hereinafter the same) stores a plurality of files.

The second storage means b includes, when a file in the first storage means a is updated, process information for requesting re-execution based on the file update content for processing performed before the file update. Is stored in association with each file.

When the executing process updates the file to be processed by the executing process, the searching unit c suspends the execution of the process, and stores the process information corresponding to the file related to the update on the second storage unit b. Search for.

When the process information is retrieved by the retrieval device c, the process switching device d sequentially switches to a process corresponding to all the retrieved process information, and executes a process based on the file update content. When the process of the process to be updated is completed, the process of updating the file is restarted.

[Operation] The operation of the means of the present invention is as follows.

Now, the first storage means a stores a plurality of files including the file FA, and the second storage means b stores the file FA in the first storage means a when the file AF is changed. In the state where the search process PA is stored, the search process of the file FA by the search process PA and the rewriting process PB
Is performed alternately at a predetermined timing.

In such a situation, if the rewriting of the file FA is executed by the rewriting process PB, the search means c searches the second storage means b for a process corresponding to the file FA to be rewritten. In this example, as described above, since the search process PA is stored as a process corresponding to the file FA, the search process PA is searched.

Therefore, the process switching unit d switches to the searched search process PA and executes a predetermined process for coping with the file change corresponding to the file change, for example, retrying the search.

Therefore, when a file is changed during execution of a certain process by another process that is executing concurrently with the process, a process for coping with the change is performed before the change. You can execute the process based on the file contents.

Embodiment An embodiment will be described below with reference to FIGS. 2 to 5.

FIG. 2 is a block diagram of the multi-process processing apparatus, which includes a CPU 1, a key input unit 2, a RAM 3, a hard disk 4, a disk controller 5, a display buffer 6, and a display unit 7.

The CPU 1 performs file processing on the data from the key input unit 2 according to the program loaded from the hard disk 4 onto the RAM 3, transfers the processing result and the like to the display buffer 6 and causes the display unit 7 to display the processing result and the like. To control various processes such as storing the data in the hard disk 4.

Further, the CPU 1 executes various processes in file processing, such as file change such as record update, record addition, and record deletion, and file search, on the same file or another file simultaneously and in parallel. That is, multi-process processing is performed.

As shown in FIG. 3, the RAM 3 includes a CPU work area Ea used by the CPU, a process No. 1 area Eb in which a program for the process No. 1 is stored, and a process used when executing the process 1. Areas such as No.1 work area Ec, process No.2 area Ed where the program for process No.2 is stored, and process No.2 work area Ee used when executing process No.2 are formed. ing.

In other words, a program area for a plurality of processes and work areas corresponding to these processes are formed as a set.

Some of the process programs include:
A change handling subroutine for performing a handling process when another process performs a file changing process on a file in which the process of the process is being executed is included. At the end of the change handling process subroutine, a return instruction from the change handling process is provided.

Further, a change notification request table T is set in the CPU work area Ea. As shown in FIG. 4, the change notification request table T includes a file number, a process number,
The start address of the change pair processing subroutine is registered correspondingly, and this registration processing is automatically executed by a process program. Here, file No.
The relationship between the process No. and the change versus processing subroutine is
When a file is changed by another process while the process of the process No. is being executed on the file of the file No., the process of the process No. , The change handling process is executed by an interrupt process.

The change notification request table T has one file.
In some cases, a plurality of process numbers and change pair processing subroutines are registered in correspondence with the number.

The hard disk 4 stores programs for various processes and a plurality of files. Direct input / output to / from the hard disk 4 is executed under the control of the disk controller 5.

The processes include a process of loading a file to be executed into a corresponding work area and executing a file process, and a process of executing a file process on the hard disk 4. When executing the multi-process, the CPU 1 executes the process number register PN, the program counter PC, the status register ST, and the file number register FN.
Next, the multi-process processing of the embodiment will be described with reference to FIG. 5, but in the flowchart of FIG. 5, it is understood that the meaning of the previous step is not after the latter step is described. Since it is difficult, each step will be described in order from the top, and then a description will be given along with the flow of actual processing.

First, the CPU 1 initializes the process No. 1 register PN to "1", the program counter PC to the start address of the process No. 1, and the status register ST to "normal" (step S1).

Next, an instruction is fetched from the address indicated by the program counter PC, and the address in the program counter PC is incremented by one (step S2). Then, it is determined whether or not the fetched instruction is a file change instruction such as a record update, a record addition, and a record deletion (step S).
3). As a result, if it is not a file change instruction, it is determined whether or not the fetched instruction is an instruction to be registered in the change notification request table T (step S4). If the instruction is not a registered instruction, it is further determined whether the fetched instruction is a return instruction from the change handling subroutine (step S5). As a result, if it is not a return instruction, the fetched instruction is executed (step S6). That is, all commands other than the file change command, the command to register in the change notification request table T, and the return command are executed in step S6.

Next, it is determined whether or not the content of the status register ST is "normal" and there is a process switching factor such as a lapse of a predetermined time or more from the previous process switching (step S7). If not, the process returns to step S2. On the other hand, if there is a process switching factor, the contents of various registers such as the current program number register PN and the program counter PC are saved in the CPU work area Ea, and the process number of the process related to the switching is set in the process number register. PN is newly set, and the address of the next instruction to be executed in the process related to the switching (this address is the start address or the saved address) is set or restored in the program counter PC. Pre-process switching processing such as restoring various registers is performed (step S8), and the process returns to step S2.

If it is determined in step S3 that the instruction is a file change instruction, the flow advances to step S9 to determine whether or not the contents of the status register ST are "change handling". as a result,
If it is “Normal” instead of “Troubleshooting”, file number
In the register FN, the file of the file to be changed related to the instruction
No. is set, and a change process is executed for the file (step S10).

Then, it is determined whether or not the file number in the file number register FN is registered in the change notification request table T (step S11). If not, the process returns to step S2.

On the other hand, when it is registered, first, as a pre-process for causing a process to be described below to be executed by interruption, a coping process for coping with the file change process in step S10 is firstly performed.
Current program number register PN, program counter P
Save various registers such as C (step S12).

Then, the file N in the change notification request table T
The process No. corresponding to o. is set in the process No. register PN, the start address of the corresponding change handling routine is set in the program counter PC, and "change handling" is set in the status register ST (step S1).
3) Return to step S2.

Note that if it is determined in step S9 that the content of the status register ST is “change handling”, an error occurs.

When it is determined in step S4 that the instruction is a change notification request registration instruction, it is determined whether or not the content of the status register ST is "normal" (step S14). As a result, if it is “normal”, a registration process to the change notification request table T is executed according to the registration command (step S15),
It returns to step S2. If not "normal", error processing is performed.

If it is determined in step S5 that the instruction is a return instruction from the change handling processing routine, it is determined whether or not the contents of the status register ST are “change handling” (step S5).
S16). As a result, if the response is “late-time response”, it is determined whether or not another process number corresponding to the file number of the file related to the change still exists in the change notification request table T (step S17). As a result, if it still exists, the process returns to step S13, and the process No.
No. Register PN is newly set, and the start address of the corresponding routine is newly set in the program counter PC. At this time, the content in the status register ST, that is, "change handling" is held as it is.

On the other hand, if there is no other process No., the various registers such as the saved program No. register PN and program counter PC are restored, and “normal” is set in the status register ST (step S18), and step S2 Return to When it is determined in step S16 that the status is "normal", an error process is performed.

 Next, a description will be given along an actual processing flow.

Each process that wants to be registered in the change notification request table T, every time the power is turned on or the start of a set of multi-process processing is performed, every time the process is changed.
The registration instruction is positioned at the start address of each process, and each process that wants to register performs this registration first. That is, first, table registration is performed through the route of steps S1, S2, S3, S4, S14, and S15.

Steps S2 → S3 → S4 → S5 → S6 → S7 → S2 ...
When the same certain process is continuously executed by the cycle described above and a process switching factor occurs, the process is switched to the next switching process by executing the process switching pre-processing in step S8 and returning to step S2. It is continuously executed until a factor occurs.

At this time, if the file is changed in a certain process, the process proceeds to step S9 and subsequent steps via step S3.
That is, in step S10, a file change based on the command is executed, and when the file number of the file related to the change is registered in the table T, the steps S11 → S12 →
By returning to step S2 through the route of S13, the process registered corresponding to the changed file executes a predetermined countermeasure process for coping with the file change based on a change coping process subroutine. This coping process is performed by an interrupt process.

At this time, if a plurality of process numbers are registered corresponding to the above file numbers, steps S5 → S16 → S17 → S13
By returning to step S2 through the route of the above, these processes similarly execute the processing for coping with the file change in step S10 by interruption.

As described above, when a file being executed is changed by another process being executed concurrently and concurrently, the process that has executed based on the contents of the file before the change processing is executed. A predetermined process corresponding to a file change is executed by interruption.

[Effects of the Invention] According to the present invention, when a file is changed during execution of a certain process by another process executing concurrently with the process, the change is performed. The process that executed the process based on the contents of the file before the change process can be performed, and the change process of the file being executed by another process can be executed simultaneously and in parallel, so that the process is speeded up Can be achieved.

[Brief description of the drawings]

1 is a functional block diagram of the present invention, FIG. 2 is a block diagram of an embodiment, FIG. 3 is a diagram showing data contents of a RAM,
FIG. 4 is a diagram showing data contents of a change notification request table;
FIG. 5 is a flowchart showing the multi-process processing of the embodiment. 1 ... CPU, 3 ... RAM, 4 ... Hard disk, T ...
Change request notification table.

Continuation of front page (56) References JP-A-63-289657 (JP, A) JP-A-1-166124 (JP, A) JP-A-61-95450 (JP, A) JP-A-2-2022674 (JP, A) , A) JP-A-63-146134 (JP, A) JEFFREY D .; ULMAN., Toshiyasu Kunii, Nobuo Ohbo, co-translation, "Database System Principles", Japan Computer Association, published (1985, first edition), p. 486-492 (58) Field surveyed (Int.Cl. ⁶ , DB name) G06F 9 / 46,11 / 14,12 / 00 G06F 15 / 00,17 / 30

Claims (1)

(57) [Claims] 1. A multi-process processing apparatus for sequentially switching a plurality of processes and processing them concurrently in parallel, a first storage means for storing a plurality of files, and a file in the first storage means is updated. At this time, a second storage means for storing, in association with each file, process information for requesting re-execution based on the file update content for a process executed before the file update, When the file is updated for the target file, the execution of the process is interrupted, and the second
Searching means for searching the process information corresponding to the file related to the update on the storage means, and, when the corresponding process information is searched by the searching means, the process corresponding to all the searched process information is performed. And a process switching means for sequentially switching and executing a process based on the contents of the file update, and resuming execution of the process that has performed the file update upon completion of the processes of all the update handling processes. Multi-process processing equipment.