JPH02214949A - Display device for application state of system resources - Google Patents

Abstract

PURPOSE:To display the application state of the system resources in real time by displaying the data signal on a data bus when the coincidence is obtained between the address signal on an address bus and the address signal of the system resources. CONSTITUTION:A resource address comparator 5 always monitors the signals of a memory write control line 10 and an address bus 11 and fetches the address signals flowing through the bus 11 every time the control signal of the line 10 is turned on. The fetched address signals are compared with all addresses stored in a resource address storing circuit 3. The coincident addresses if detected are informed to a display circuit 9. The circuit 9 fetches the data on a data bus 12, i.e., the application state of the system resources and displays it when the information on the address coincidence is received. As a result, the application state of the system resources is confirmed in real time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a system resource usage state display device that displays the usage state of system resources managed by a monitor program of a microcomputer system.

[Prior Art] Programs executed by a system using a microcomputer are generally divided into task programs that perform system-specific tasks and monitor programs that control the operation of task programs and hardware. .

Here, the monitor program generally manages software system resources such as event flags, semaphores, and memory pools, and sets and resets flags, lends out memory pools, and controls the entire memory pool in response to requests from task programs. The number of remaining bytes is updated, etc.

Conventionally, in order for a person such as a programmer to refer to and confirm the usage status of the system resources, a new program for reporting the usage status of system resources is created and installed in the system, and this program is activated at the necessary time. It displayed the usage status such as the set/reset status of event flags and the number of remaining bytes of the memory pool.

[Problems to be Solved by the Invention] However, the conventional confirmation means as described above temporarily interrupts the original operation of the system and displays the usage status at the time of interruption, and therefore changes from time to time. It is impossible to refer to and check usage status in real time, and it takes a great deal of effort and time to identify the causes of abnormal system resource usage and capacity shortages when a system failure occurs or during a system test. I needed it.

The present invention has been made in view of such problems, and includes:
It is an object of the present invention to provide a system resource usage status display device that allows the usage status of system resources to be confirmed in real time and allows the cause of a system failure to be efficiently investigated in a short time.

[Means for Solving the Problems] A system resource usage status display device according to the present invention includes a monitor program connected to an address bus and a data bus connecting a central processing unit and a main memory, and stored in the main memory. A system resource usage status display device that displays the usage status of system resources to be managed, comprising: a resource address storage circuit that stores a plurality of addresses of the system resources; an address signal flowing through the address bus during program execution; a resource address comparison circuit that compares an address in the resource address storage circuit and generates and outputs a first match signal when both addresses match; A stack address storage circuit to save,
a stack address comparison circuit that compares an address signal flowing through the address bus with an address in the stack address storage circuit during program execution and generates and outputs a second match signal when the two addresses match; A task address storage circuit that stores an address range and a second match signal from the stack address comparison circuit are input, and based on the content of the data signal flowing through the data bus at this input point, the task address storage circuit A task number acquisition circuit that acquires a number and a first match signal from the resource address comparison circuit are input, and at the time of this input, the content of the data signal flowing through the data bus and the task that is the output of the task number acquisition circuit are input. The present invention is characterized by comprising a display circuit that simultaneously displays a number and a number.

[Operation] According to the present invention, the address signal on the address bus is constantly monitored, and when this address signal matches the address signal of the system resource, the data signal on the data bus at that time is displayed. This makes it possible to display the ever-changing usage status of system resources in real time.

Further, according to the present invention, the task number can be specified from the address of the monitor call instruction in the task that started the system resource management program, and this task number can be displayed together with the usage status.

Therefore, according to the present invention, the cause of a system failure can be efficiently investigated in a short time.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram of a microcomputer equipped with a system resource usage status display device according to an embodiment of the present invention.

The central processing unit 1 is connected to the main memory 2 via a memory write control line 1o, an address bus 11, and a data bus 12, and executes programs stored in the main memory 2.

Main memory 2 stores monitor programs and task programs.

A system resource usage status display device configured as follows is connected to the memory write control line 10, address bus 11, and data bus 12.

That is, the resource address storage circuit 3 stores the addresses of a plurality of system resources managed by the monitor program stored in the main memory 2. Here, system resources refer to software resources such as event flags, semaphores, and memory pools. Resource address comparison circuit 5
monitors the address bus 11 while the central processing unit 1 is executing the program, compares the address signal on the address bus 11 with all addresses stored in the resource address storage circuit 3, and if the two match, Then, a first coincidence signal is generated and output.

The stack address storage circuit 4 stores the top address of each stack of the system resource management program, which is provided in the monitor program by the number of system resources. The stack address comparison circuit 6 monitors the address bus 11 while the central processing unit 1 is executing the program, and compares the address signal of the address bus 1 with all addresses stored in the stack address storage circuit 4. When both addresses match, a second match signal is generated and output.

Further, the stack address storage circuit 8 stores the address range of each task. When the second match signal is output from the stack address comparison circuit 6, the task number acquisition circuit 7 inputs the data signal on the data bus 12 at that time and selects the task stored in the CUSCUA 1 JERES storage circuit 8. Identify the currently executing task number from the address range.

Furthermore, the display circuit 9 simultaneously displays the contents of the data bus 24 and the task number acquired by the task number acquisition circuit 7 based on the first match signal from the resource address comparison circuit 3.

Next, the operation of the microcomputer configured as described above will be explained.

When the central processing unit 1 is started, an initialization routine in the monitor program stored in the main memory 2 is executed, and as part of the initialization routine, multiple system resource addresses are written to the resource address storage circuit 3. Then, a plurality of stack addresses of the system resource management program are written to the stack address storage circuit 4, and a plurality of address ranges of the task program are written to the task address storage circuit 8.

When the initialization is completed, the task program stored in the main memory 2 starts executing. The resource address comparison circuit 5 constantly intercepts the signals on the memory write control line 1o and the address bus 11, and captures the address signal flowing through the address bus 11 every time the control signal on the memory write control line 10 is turned on. , and compares this with all addresses stored in the resource address storage circuit 3. If a matching address is detected, the display circuit 9 is notified of the address. When the display circuit 9 receives the notification, the display circuit 9 connects the data bus 1.
2, that is, the usage status of system resources, is captured and displayed. Here, the usage status of system resources includes, for example, whether an event flag is set or reset, and the number of bytes remaining in the memory pool.

On the other hand, the stack address comparison circuit 6 also constantly intercepts the signals on the memory write control line 10 and the address bus 11, and whenever the control signal on the memory write control line 10 is turned on, the stack address comparison circuit 6 also intercepts the signals on the address bus 11. The signal is taken in and compared with all addresses stored in the stack address storage circuit 4.

If a matching address is detected, the task number acquisition circuit 7 is notified of the address. Task number acquisition port i
¥87 takes in the data on the data bus 12 at the time of receiving the notification, that is, the address of the monitor call instruction in the task that is about to use system resources, and specifies whether it is from this task or the other task. , the task address storage circuit 8 is searched to identify the task number.

The display port ii'89 receives the notification from the resource address comparison circuit 5, takes in the usage state of system resources from the data bus 12, and at the same time obtains the task number from the task number acquisition circuit 7 and displays it. The display contents consist of the usage status of system resources and the numbers of tasks that have used or stopped using the system resources.

By repeatedly performing the above operations after a task is activated, it becomes possible to display the ever-changing usage status of system resources together with the task number in real time.

[Effects of the Invention] As explained above, the present invention is capable of displaying the usage status of system resources together with task numbers in real time, so that it is possible to quickly investigate system malfunctions caused by excess or shortage of system resources. This has the effect of significantly reducing the time required to repair system failures and test the system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a system resource usage status display device according to an embodiment of the present invention. 1; central processing unit; 2; main memory; 3; resource address storage circuit; 4; stack address storage circuit; 5; resource address comparison circuit; 6. Stack address comparison circuit, 7; task number acquisition circuit, 8. Task address storage circuit, 9;
Display circuit, 10. Memory write control line, 11 near address bus, 12: data bus

Claims (1)

[Claims] (1) A system resource usage status display device that is connected to an address bus and a data bus that connect a central processing unit and a main memory, and displays the usage status of system resources managed by a monitor program stored in the main memory; A resource address storage circuit that stores a plurality of addresses of the system resources compares an address signal flowing through the address bus with an address in the resource address storage circuit during program execution, and when both addresses match. a resource address comparison circuit that generates and outputs a first match signal; a stack address storage circuit that stores the top address of the stack of each system resource management program in the monitor program; and an address signal that flows through the address bus during program execution. and an address in the stack address storage circuit, and generates and outputs a second match signal when both addresses match;
A task address storage circuit that stores the address range of each task and a second match signal from the stack address comparison circuit are input, and the task address is stored based on the content of the data signal flowing through the data bus at the time of input. a task number acquisition circuit that acquires a task number from the circuit;
a display circuit that receives a first match signal from the resource address comparison circuit and simultaneously displays the content of the data signal flowing through the data bus at the time of input and the task number that is the output of the task number acquisition circuit; A system resource usage status display device comprising: