JPH0667954A - File access system - Google Patents

Abstract

PURPOSE:To speed up file access through the use of a memory and a memory management table managing the memory on a UNIX operating system. CONSTITUTION:A mechanism for controlling a common memory 2 is incorporated in a user process 3, the common memory table 1 is installed on the common memory 2, the common memory 2 is mapped based on the unitary management and a file is developed in the memory so as to access to the file on the UNIX operating system. Thus, the respective user processes 3 can deal with the common memory 2 as common memories 4 that they themselves manage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file access system of UNIX operating system.

[0002]

2. Description of the Related Art The conventional file access method is UNI
It relied on the X operating system, which was directly accessing the disk.

[0003]

However, in this conventional file access method, in order to access a file from a plurality of processes, the file has to be always placed on the disk, and therefore the speed of the disk is limited. The limit is directly imposed, and a process that reads and writes many files becomes very slow regardless of CPU performance and load. Therefore, the present invention enables a file to be executed at a speed higher than that of a disk in the file access method.

[0004]

In the present invention, U
In the UNIX operating system, a mechanism for controlling the shared memory is installed in the user process, the shared memory management table is placed on the shared memory, the shared memory is mapped under the unified management, and the file is expanded and accessed there. To do.

[0005]

The above file access method has a sufficient speed advantage as compared with the case of directly accessing the disk.

[0006]

1 shows an example of a file access system according to the present invention, and FIG. 2 shows the contents of a shared memory management table 1 used in the present invention. In this example, user process 3
However, in order to place the file to be accessed in the shared memory 2, the shared memory management table 1 has a file name 5, an identification number 7 for identifying the user process 3, a system ID number 8 managed by the operating system, and a memory size to be secured. 9 is registered, and the shared memory 2 is secured on the real memory. Then, the user process 3 sets the use state flag 6 in order to maintain the consistency of the file data,
The shared memory 4 is accessed as if it were a memory under its control. As a result, each user process 3 can handle the plurality of shared memories 4 as memories under its own control, and the consistency with the data and the system can also be used flag 6 and system ID number in the shared memory management table 1. 8
Can be taken at. Note that the number of shared memories 2 and user processes 3 is not particularly limited other than the limit of the actual memory.

[0007]

According to the file access method of the present invention constructed as described above, it has a sufficient speed advantage over disk access. In particular, a user process that accesses the same file many times can greatly speed up.

[Brief description of drawings]

FIG. 1 is an example of a diagram showing a memory image recognized from each process in the present invention.

FIG. 2 is a diagram showing the contents of a shared memory management table used in the present invention.

[Explanation of symbols]

 1 shared memory management table 2 secured shared memory 3 user process 4 shared memory accessible by process 5 file name 6 usage status flag 7 identification number 8 system ID number 9 memory size

Claims (1)

[Claims] 1. On the UNIX operating system, a mechanism for controlling a shared memory is installed in a user process, a shared memory management table is placed on the shared memory, the shared memory is mapped under the unified management, and files are stored there. File access method to access by expanding.