JPS6136851A - Display device for application state of system resources - Google Patents

Abstract

PURPOSE:To attain the effective utilization of system resources of a microcomputer by using an address preservating circuit, an address comparator and a display circuit. CONSTITUTION:When a central processor 4 is started, a system initialization part within a monitor program stored in a main memory 5 is executed. Then plural addresses of the system resources are written previously an address preserving circuit 1. An address comparator 2 always intercepts the signals of a memory write contol line 6 and an address bus 7 and fetches the address signals flowing to the bus 7 every time the control signal of the line 6 is turned on to compare them with all addresses preserved by the circuit 1. When the coincident addresses are detected, the numbers of these addresses are informed to a display circuit 3. Thus the data on a data bus 8, i.e., the application state of the system resources is fetched to perform a display in response to said application state.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device that displays in real time the usage status of system resources used by programs executed on a microcomputer system.

(Prior art) Programs executed in a system using a microcomputer are divided into a task program that performs system-specific tasks and a monitor program that controls the operation of the task program and controls the hardware. is common. The monitor program manages software-like system resources commonly called event flags, semaphores, or memory pools, and sets or resets flags or maintains the memory pool in response to requests from task programs. The number of bytes is updated, etc.

Conventionally, as a means for humans to refer to and check the usage status of system resources, such as a programmer, a new program to report the usage status of system resources was created and installed in the system, and this program was run at the necessary time. to display usage status.

(Problem to be solved by the invention) However, since such confirmation means temporarily interrupts the original system operation and displays the usage status at the time of suspension, it is difficult to monitor the usage status that changes from moment to moment. It is impossible to perform a reference check in real time, and it requires a great deal of effort and time to identify the cause of abnormal use of system resources, insufficient capacity, etc. when a system failure occurs or during a system test.

(Means for Solving the Problems) The present invention makes it possible to recognize the global movement of the entire system by displaying the usage status of software system resources in real time according to their fluctuations. This is what I am trying to do.

In order to achieve the above object, the present invention has the following configuration.

That is, in a microcomputer system consisting of a central processing unit and a main memory, there is an address storage circuit that stores a plurality of addresses of system resources used by the program, an address signal flowing through an address bus during program execution, and an address storage circuit that stores addresses of system resources used by the program. An address comparison circuit that receives and compares the stored address signal from the circuit and outputs a signal when both addresses match, and an address comparison circuit that receives this signal output and captures and displays the contents of the data signal flowing on the data bus at that time. 1. A system resource usage status display device comprising: a display circuit for displaying a system resource usage state;

(Operation) Hereinafter, the operation of the system resource usage status display device according to the present invention will be explained based on the drawings.

FIG. 1 is a block diagram showing the configuration of the present invention.

When the central processing unit 4 is started, a system initialization part of the monitor program stored in the main memory 5 is executed, and a part of the initialization part stores a plurality of addresses of system resources in the address storage circuit 1. Write it down. The address storage circuit 1 adds a unique address number to each written address. When the system initialization is completed, the task program stored in the main memory 5 starts executing. The address comparison circuit 2 constantly intercepts the signals on the memory write control line 6 and the address bus 7, and every time the memory write control line 60 control signal is turned on, it takes in the address signal flowing through the address bus 7 and reads it. Address storage circuit 1
Compare with all addresses stored in . If a matching address is detected, the address number 7 is notified to the display circuit 3, and upon receiving the notification, the display circuit 3 takes in the data on the data bus 8, that is, the usage status of the system resources, and changes it to that status. Display accordingly. The usage status of system resources includes, for example, whether an event flag has been set or reset, or the number of bytes remaining in the memory pool.

By repeatedly performing the above operations after a task is started, it becomes possible to display the constantly changing usage status of system resources in real time.

(Effects of the Invention) As explained above, the present invention provides an address storage circuit, an address comparison circuit, and a display circuit in a microcomputer system consisting of a central processing unit and a main memory. It is possible to display the usage status of system resources in real time, which was previously impossible to recognize, so it is possible to quickly investigate system problems caused by excess or shortage of system resources.
This has the advantage of greatly reducing the time required to repair system failures and test the system.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention.

Claims (1)

[Claims] In a microcomputer system consisting of a central processing unit and a main memory, there is an address storage circuit that stores multiple addresses of system resources used by a program, and an address signal flowing through an address bus during program execution and storage from the address storage circuit. an address comparator circuit that receives and compares the address signal sent to the data bus and outputs a signal when the two addresses match, and a display circuit that receives this signal output and captures and displays the content of the data signal flowing through the data bus at that time. A system resource usage status display device comprising: