KR950010484B1 - A real-time operation method for an electronic exchanger - Google Patents

Abstract

The method constructs a system library by using one common procedure. The method comprises the steps of; (A)constructing a system library and loading the system library in block units; (B)registering the system library by a library register request from an user; (C)calling the system library by an user; (D)connecting to the requested procedure; and (E)setting threshold area necessary to execute the system library.

Description

How to implement system library function in real time operating system

1 is a block diagram of a hardware system to which the present invention is applied.

2 is a block diagram of a software block to which the present invention is applied.

3 is a software functional block diagram of the present invention.

4 is a flow chart of the present invention.

5 to 9 are detailed flow charts of the present invention.

* Explanation of symbols for main parts of the drawings

MPMA: Central Processing Unit Board PCCA: Communication Control Board

DCCA: Redundant Control Board MFP: Multi-Function Peripheral

SHL: System Library OS: Operating System

pop: get the contents of the stack and decrement the stack pointer

push: put content on stack and increment stack pointer

The present invention relates to a method for implementing a system library function required to increase the modularity and efficiency of software in developing massive software in a large capacity real-time exchange system.

Conventional switching system technology requires that a mode procedure for an application software be present directly in the software block. As a result, unnecessary duplication occurs and this leads to inefficient operation due to waste of resources in the system and communication burden between blocks. New concepts are required to be added.

Accordingly, an object of the present invention is to provide a method of implementing a function of a system library that can be used in a system without using common procedures in duplicate to increase modularity, reusability, and efficiency of software.

In order to achieve the above object, the present invention, the main board functioning as the main control function, the communication control board which is connected to the communication node under the control of the main board and performs communication with other processors, the redundant board for the redundancy control, an external device The I / O board responsible for I / O is connected to the system bus, which consists of redundancy and has a channel for redundancy communication, and generates a central processing unit, a memory device, and an interrupt that have a memory management unit function in the main board. A method applied to hardware having an MFP to perform a system library function, the method comprising: a first step of constructing a system library, a system library registration request from a user after loading the system library and application software after performing the first step; Register your system library when it comes Is a second step, a third step of calling a system library by a user after performing the second step, a fourth step of connecting to an actual request procedure after performing the third step, and performing a system library after performing the fourth step And a fifth step of guaranteeing a time critical region.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a hardware configuration diagram to which the present invention is applied, in which FIG. 1 (a) is a processor structure diagram and FIG. 1 (b) is a motherboard structure diagram.

The processor shown in FIG. 1 (a) is a main board (1: MPMA) serving as a main control function, a communication control under the control of the main board, and connected to a communication node (2: Node) to perform communication with other processors. Board (3: PCCA), redundancy board (4: DCCA) for redundancy control, and I / O boards (5) that are responsible for I / O according to external devices are connected to the system bus (6: Bus). It has a channel 7 for redundant communication. In addition, the main board (1: MPMA) shown in FIG. 1 (b) generates a central processing unit (9: CPU), a memory (10: memory), and an interrupt having a memory management unit (8: MMU) function. MFP 11 or the like.

2 is a block diagram of a software block to which the present invention is applied. Two or more general user blocks 15 call and use a system library (hereinafter referred to as SHL). (17: hereinafter referred to as OS) Prompt calls are possible. There may also be multiple such SHLs in the system.

3 is a block diagram of the software block diagram of the present invention, in which a protocol is defined between the SHL 16 and the user block, and the SHL caller 21 and SHL (calling the SHL 16 in the user block according to the protocol) are executed. Unlike the general user blocks, the SHL matching unit 22 and the SHL matching unit 22 and SHL 16 which are linked to the user block and linked to the user block are provided in 16). 16, the SHL registration function unit 24 provides a function for the user block to use, and the SHL execution unit 25 guaranteeing a critical area for the SHL 16. Here, the SHL calling unit 21 and the SHL matching unit 22 are present in the user block 26, and the SHL configuration unit 23 is the SHL registration function unit 24 and the SHL performing unit 25 in the SHL 27 block. Are each present in the OS 17.

The present invention defines and implements the roles of the user block 15, the SHL 16, and the OS 17 in FIG. 2 using software existing in the memory 9 of FIG. It is configured to provide the functions that can be operated by composing the commonly used procedures into one system library.

4 is a flowchart of the overall process of the present invention.

First, the SHL 16 is configured (31), and the SHL 16 is loaded into the system memory (32). Next, the user block is loaded into the system memory (33). If the SHL (16) registration request primitive is inputted for use of the SHL (16) in the user block during the execution of the user block (34), the SHL register 34 receives the received request from the user block to use the SHL (16). Register (35). This makes the user block 15 ready to use the SHL primitives. Thereafter, when the procedure provided by the SHL 16 is called (36), the SHL performing unit 38 is controlled by the SHL performing unit 38 to complete the execution. After execution, the return value is returned to the calling user (39), and the process ends.

The present invention is configured to provide a system library function in a real-time system by implementing all functions necessary for configuring, registering, calling, matching, and performing SHL.

5 is a detailed flowchart according to the SHL configuration control.

First, a procedure table listing procedure entries is constructed and set as initial initialization data (41). The table address is entered 42 in the SHL match. After writing the actual contents of the procedures registered in the procedure table (43). Link to a non-overlapping address with the general user block (44).

6 is a detailed flowchart according to the SHL registration control.

When the SHL (16) registration request primitive is input from the user (51) to start execution, it is checked whether the registration request SHL is loaded (52). If not, an error is returned (53) to finish the execution. If so, it checks whether the SHL (16) address area is duplicated with the user (54), and if it is duplicated, returns an error (53) to finish the operation. If not duplicated, the text data area of the SHL 16 is registered as the user area in a form that the MMU 7 in FIG. 1 can recognize (55).

7 (a) is a detailed flowchart according to SHL call part control, and (b) is a stack structure diagram.

When calling a procedure provided by SHL 16, the matching routine is called instead of calling the procedure directly. The procedure number and the argument of the procedure are set as input parameters (61), and the matching routine is called (62). The structure of the stack after the call is shown in FIG.

FIG. 8 (a) is a detailed flowchart according to the SHL matching control, and FIG. 8 (b) is a stack structure diagram.

Here, it provides an interface between the user and the SHL. When the procedure number and arguments are passed (71), the program counter (hereinafter referred to as PC) on the stack is first popped (72). After popping the number (73), the PC that was on the stack is pushed (74). The procedure table address 75 provided by the SHL 16 jumps to the procedure using the procedure number as an index (76).

After this adjustment, the structure of the stack becomes as shown in FIG. 8 (b), and is the same as the structure in which the user directly calls the SHL procedure.

9 is a detailed haze diagram according to SHL performance control.

Here, the execution of SHL may be paused and the control may be transferred to the OS 17 due to the external internship generated by the MFP 11 of FIG. 1 during SHL. In this case, the OS 17 may schedule another process. This can lead to inconsistencies in the data that are commonly accessed by multiple processes, causing the system to fail. To prevent this, the SHL procedure should ensure that once it starts running, it does not lose control to other processes until it finishes running. To this end, when an external interrupt occurs (81), when the CPU control right acquisition process is determined, the PC is examined (82) and within the SHL text area (83) without returning to the scheduler (84) and returning to the location of the interrupted SHL (85). If the PC is not in the SHL text area, the interrupt is processed normally (86).

Therefore, the present invention carried out by the above procedure realizes the system library function in the large-scale real-time system, avoiding software redundancy, waste of resources, inefficiency, etc. in the development of large-scale soft control, and the modularity of the system There is an effect of increasing the efficiency.

Claims (6)

The main board (1: MPMA) serving as the main control function, the communication control board (3: PCCA) that is connected to the communication node (2: Node) under the control of the main board and is in communication with other processors, and performs the redundancy control. The redundancy board (4: DCCA) and the I / O board (5) that performs I / O according to the external device are connected to the system bus (6: Bus), which consists of redundancy and has a channel (7) for redundancy communication. The main board 1 is applied to a hardware including a central processing unit (9: CPU) having a memory management unit (8: MMU) function, a storage device (10: MEMORY), and an MFP (11) for generating an interrupt. In the method for performing a system library function, a first step (41 to 44) of configuring a system library, and a second step (51) of registering a system library when a system library registration request is received from a user after block loading. To 55), a third step (61 to 62) of calling a system library by the user after performing the second step (51 to 55), and connecting to the actual request procedure after performing the third step (61 to 62). Implementing the system library function, characterized in that performed by the fourth step (71 to 76), the fifth step (81 to 86) to ensure a critical area when the system library is executed after the fourth step (71 to 76) Way. The method of claim 1, wherein the first steps (41 to 44) comprise configuring a procedure table and setting the initial initialization data (41) and after performing the step (41), the table address is assigned to a system library ( Hereinafter, the step 42 of inputting to the matching unit, the actual contents of the procedures registered in the procedure table after the step 42 is performed, and then linked to a non-overlapping address with the general user block. A method of implementing a system library function, characterized in that carried out by steps (43, 44). The method as claimed in claim 1, wherein the second steps 51 to 54 check whether the registration request SHL is loaded when the SHL registration request primitive is input from the user and starts execution. After performing the steps 51 and 52, an error is returned if the loading is not completed, and if the loading is performed, the steps 53 and 54 checking whether the SHL address area overlaps with the user (53 and 54). After the execution, if the address area is duplicated, an error is returned and the execution ends. If the address area is not duplicated, the text data area of the SHL is registered by the user area 53 and 55 in a form that the MMU 7 can recognize. System library function implementation method characterized in that. The method of claim 1, wherein the third steps (61, 62) comprise setting a procedure number and an argument of the procedure as an input parameter (61), and after performing the step (61), performs a matching routine. A method of implementing a system library function, characterized in that performed by calling steps (61, 62). 4. The method of claim 1, wherein the fourth steps 41 to 44 are performed to pop a program counter (hereinafter referred to as a PC) and a procedure number on the stack when the procedure number and arguments are delivered. Steps 71 to 73, after performing steps 71 to 73, pushing a PC that was on the stack, 74, and after performing step 74, a procedure at the procedure table address provided by the SHL. A method for implementing a system library function, characterized in that performed by steps (75, 76) jumping to a procedure using a sequence number as an index. According to claim 1, wherein the fifth step (81 to 86), the step of examining the PC when determining the CPU control right acquisition process when an external interrupt occurs (81, 82), after performing the step (81, 82), If it is in the SHL text area, it returns to the location of the interrupted SHL without calling the scheduler. If the PC is not in the SHL text area, the system library function is implemented by performing normal processing of interrupts (83 to 86). Way.