JPH064319A - Shared routine management method in operating system - Google Patents

Abstract

(57) [Summary] [Purpose] In an operating system that executes multiple processes in parallel in a time-sharing manner, routines shared by multiple processes are incorporated into the operating system to improve memory usage efficiency. Configuration: Each process uses syscall to call a shared routine, and a shared routine search routine in the operating system searches for a shared routine to call and calls a shared routine existing in the operating system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating system of an information processing system of the present invention, and more particularly to a common routine management system in an operating system for registering and managing routines shared by processes.

[0002]

2. Description of the Related Art In an information processing system, by switching a plurality of processes in a time-sharing manner,
Traditional operating system with the ability to run in parallel
In the system, all the routines used by each process had to be linked to each process, except for the system calls supported by the operating system.

[0003]

Conventionally, even if there is a routine shared by each process, it is necessary to link the shared routine for each process. There is a problem that the same shared routine exists in the same number as the number of processes, and the memory use effect is bad.

An object of the present invention is to provide a shared routine management system in an operating system which solves such a problem.

[0005]

According to the present invention, in an operating system of an information processing system for executing a plurality of processes in parallel by performing process switching in a time-sharing manner, a routine shared by a plurality of processes is operated. The feature is that when the process is fetched inside the system and each process calls a shared routine, the shared routine search routine inside the operating system searches for the shared routine to be called and calls the shared routine existing inside the operating system. To do.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a shared routine management system in an operating system of the present invention will be described with reference to the drawings.

FIG. 1 is a shared routine management table managed by the operating system. Registered in this table are the system serial numbers 1 to n of the shared routines, the start addresses ROUTINE 1 to n of the shared routines, and the arguments ARG 1 to n passed to the shared routines. To add a shared routine for use by the system, add the shared routine to this table and link it with the operating system.

FIG. 2 shows a method for calling a shared routine from each process. syscall is a common instruction used to call a shared routine from a process. To execute this instruction, the serial number of the shared routine to be called in the shared routine management table as an argument and the argument to be passed to the shared routine are defined. .

FIG. 3 is a diagram showing an outline of the system.
When each process uses syscall to call a shared routine, the shared routine search routine in the operating system searches for a shared routine to call and calls the shared routine existing in the operating system.

FIG. 4 is a flowchart for calling a shared routine. Further, FIG. 5 is a diagram showing changes in the stack in each process.

With syscall, the arguments of syscall are stacked on the stack of the process, as shown in FIG. Figure 5 for software interrupt instructions
The internal state of the CPU is further stacked on the stack of the process as shown in (B). A software interrupt command is executed in the
The shared routine search routine inside the system is called. The shared routine search routine reads the serial number of the shared routine loaded on the stack, and uses this to read the start address of the shared routine and the number of arguments to be passed to the shared routine from the shared routine management table. Then, the number of arguments to be passed to the shared routine is read from the stack and further stacked on the stack. The stack at this time is shown in FIG. After that, when the start address of the shared routine is called, the shared routine reads the arguments stacked on the stack, and the same processing as that directly called from each process is performed.

[0012]

According to the shared routine management method in the operating system of the present invention, the shared routines existing in the memory by the number of shared processes in the prior art are registered as operating system system calls. By managing, it is possible to limit the existence in one place on the memory, and therefore it is not necessary to have a shared routine for each process in the memory, and there is an effect of improving the memory usage efficiency.

[Brief description of drawings]

FIG. 1 is a diagram showing a shared routine management table.

FIG. 2 is a diagram showing an example of calling a shared routine in each process.

FIG. 3 is a schematic diagram of a system showing a management system of the present invention.

FIG. 4 is a flowchart for calling a shared routine in each process.

FIG. 5 is a diagram showing a stack change due to a call of a shared routine in each process.

[Explanation of symbols]

 None

Claims (1)

[Claims] 1. An operating system of an information processing system for executing a plurality of processes in parallel by performing process switching in a time-sharing manner, incorporating a routine shared by a plurality of processes into the operating system, and Shared routine management in an operating system, in which a shared routine search routine in the operating system searches for a shared routine to call and calls a shared routine existing in the operating system method.