JPH03225453A - Memory area securing system - Google Patents

Abstract

PURPOSE:To effectively utilize a memory without forming an unused unnecessary area in a memory area nor the overflow of the memory area by equalizing the data length on an external storage medium to the size of a memory area secured in a virtual storage space. CONSTITUTION:It is recognized that the size of data A is 100 bytes from the repetition of a 1st input means 11 and an input data analyzing means 12 and a memory area 17 of 1,000 bytes is secured by a 1st processing means 13 and a 2nd processing means 14. Further, the data A is stored in the memory area 17 by a 2nd input means 15 and an input data storage means 16 to eliminate the formation of an unused area. Thus, the length of input data on the external storage medium 22 is equalized to the size of the memory area 17 secured in the virtual storage space to eliminate an unnecessary area and an overflow.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for allocating a memory area of an optimal size, in particular, a method for allocating data of unknown data length on an external storage medium of a system to a memory area in a virtual storage space. This invention relates to a method for securing an optimally sized memory area and storing data in a process of sequentially storing data from the beginning of the memory.

[Conventional technology]

The process of storing data in current computer systems is to store it on an external storage medium if you want to store it permanently, or in an internal memory area if you want to store it temporarily. It's normal.

Furthermore, when referring to data on an external storage medium, it is necessary to transfer the data.

Conventionally, when transferring (storing) data of unknown data length on an external storage medium to a memory area, because the data length is unknown,
To prevent the memory area from overflowing, more memory area than necessary is reserved. That is, it is common to permanently secure a memory area that is at least the maximum size that data on the external storage medium can take.

[Problem to be solved by the invention]

In the conventional technology described above, the memory area is fixedly secured with a value larger than the maximum size of input data, so even if all the input data is sequentially stored in the memory area, there will be unused areas at the rear of the memory area. This sometimes resulted in wasted areas. In extreme cases, even if the input data on the storage medium is only a few bytes worth, for example, if the input data on the storage medium could potentially be up to several thousand bytes, conventional technology can , a memory area of several thousand bytes is secured in the virtual storage space. If input data that lasts only a few bytes is stored in this several thousand byte memory area, most of the several thousand byte memory area secured at that point will be an unused and wasted area.

Additionally, if the length of the input data on the external storage medium is larger than the size of the memory area secured in the virtual storage space, there is a possibility that the memory area will overflow if the input data is stored in the memory area. There is also.

Therefore, it is an object of the present invention to provide an external storage device that can prevent phenomena such as wasted area and overflow caused by the difference between the length of input data on an external storage medium and the size of the memory area secured in a virtual storage space. By ensuring that the length of the input data on the medium is always the same as the size of the memory area secured in the virtual storage space, we have developed a method for securing an optimally sized memory area that eliminates wasted areas and overflows. It is to provide.

[Means to solve the problem]

According to the present invention, ``In the process of storing input data of unknown length on an external storage medium in a memory area in the system from the beginning of the memory, the memory area to be allocated should be allocated. a first input means for inputting input data; an input data analysis means for analyzing a data length based on the data input by the first input means; and a data length to be secured from the data length recognized by the input data analysis means. a first processing means for determining a required size of a memory area; a second processing means for securing a memory area of the required size determined by the first processing means in a virtual storage space; A second input means for inputting the data body to be stored in the memory area secured by the processing means, and an input data storage means for storing the data body input by the second input means in the memory area. A characteristic memory area reservation method J is obtained.

〔Example〕

Next, the present invention will be described in more detail with reference to the drawings showing one embodiment of the present invention.

Referring to FIG. 1, one embodiment of the present invention includes a first input means 11, an input data analysis means 12, a first processing means 13, a second processing means 14, and a second input data analysis means 12. Means 15
, an input data storage means 16 , and a memory area 17 .

Data 10 to be processed in the program is stored as input data on an external storage medium (magnetic disk, magnetic tape, etc.). The first input means 11 inputs data to be processed from the input data 10 in units of records.

The input data analysis means 12 stores the record length input by the first input means 11, and checks whether all records of data in the input data 10 have been input. If not completed, the process returns to the first input means 11 in order to input the next record. The first input means 11 inputs the code again, and the input data analysis means 12 adds the current record length to the previously saved record length and saves it. The above process is repeated until the input of all records is completed, and the data length of the input data is obtained.

The first processing means 13 determines, based on the data length obtained by the input data analysis means 12, how many bytes of memory area should be reserved in the virtual storage space.

The second processing means 14 secures a memory area of the size determined by the first processing means 13 in the virtual space.

The memory area 17 is a memory area secured in the virtual space by the second processing means 14.

The second input means 15 inputs the input data body to be stored in the memory area 17 secured by the second processing means 14 from the input data 10 in units of records.

The input data storage means 16 stores the record unit data obtained by the second input means 15 in the second processing means 1.
The information is sequentially stored in the memory area 17 secured in step 4 from the beginning of the area. At this time, since the input data length obtained by the input data analysis means 12 and the size of the memory area 17 secured by the second processing means 14 are equal, when all the data has been stored in the memory area 17, there will be no unused data. There is no space used or overflow occurs.

FIG. 2 is a diagram showing the difference between the prior art and this embodiment. FIG. 2(a) shows how the memory area is used according to the prior art, and FIG. 2(b) shows how the memory area is used according to the present embodiment.In FIG. Assume that byte data may be stored.

In the prior art, before data A is input from the external storage medium 21, the maximum 2000 bytes of data that can exist in the external storage medium 21 is secured in a virtual storage space as the memory area 31.

When data A in the external storage medium 21 is stored in this memory area 31, 20 bytes below 1000 bytes of the memory area 31
The area up to 00 bytes is unused.

In this embodiment, the size of data A is reduced to 1 by repeating the first input means 11 and the input data analysis means 12.
000 bytes, the first processing means 13
, the memory area 17 is divided into 100 by the second processing means 14.
Reserve 0 bytes. Furthermore, by storing the data A in the memory area 17 by the second input means 15 and the input data storage means 16, no unused area is generated.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to always make the data length on the external storage medium and the size of the memory area secured in the virtual storage space the same, and the input data on the external storage medium In the process of storing the data in the memory area, there is no need to create an unused area in the memory area or cause the memory area to overflow.
Memory can be used effectively.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a method for securing an optimally sized memory area according to an embodiment of the present invention, and FIGS. 2(a) and (b) are diagrams showing how to use the memory area in the conventional technology and this embodiment. It is. 10: input data, 11: first input means, 12: input data analysis means, 13: first processing means, 14: second processing means, 15: second input means, 16: input data storage means , 17: Memory area.

Claims (1)

[Claims] In the process of sequentially storing input data of unknown length in an external storage medium in a memory area in a system from the beginning of the memory, input data to be secured in a memory area to be secured is input. an input data analysis means for analyzing a data length based on the data inputted by the first input means; and an input data analysis means for analyzing a data length recognized by the input data analysis means, and determining the need for a memory area to be secured based on the data length recognized by the input data analysis means. a first processing means for determining a memory area of the required size determined by the first processing means; a second processing means for securing a memory area of the required size determined by the first processing means in the virtual storage space; a second input means for inputting the data body to be stored in the memory area, and an input data storage means for storing the data body input by the second input means in the memory area. Area reservation method.