JPH0223434A - Multi-task tracing system - Google Patents

Abstract

PURPOSE:To execute the tracing only to a special task by having a function to detect the switching of the task in a system, hold the tracing information to a tracing area for a task and refer to the tracing information of the task. CONSTITUTION:In a memory device 101, a task control block TCB for tasks A, B and C is stored and the tracing information for a task is stored in a tracing information holding device 201. The switching of the task is executed by selecting the address information of TCB by a central processing unit 102. The device 201 identifies the task during the execution by the address of the TCB from a signal line 103 and the tracing information from a tracing device 202 is distributed. When the switching of the task is executed by the device 102, the device 201 switches the tracing information. Thus, the tracing can be performed only to a special task.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tracing method, and particularly to a tracing method in a system in which a plurality of tasks are running.

[Conventional technology]

In an information processing device, the information is normally processed by a program. Programs process information sequentially. Generally, all processes in a program are related to each other and do not need to be processed sequentially. Processing speed can be improved by dividing a program into modules for each process and having each module operate in parallel.

This way of thinking is called parallel programming, and the program modules that correspond to each process are called tasks. Each task operates in parallel, synchronizes with each other, and performs processing while communicating data. An environment in which multiple tasks are running is called a multitasking environment.

Conventionally, in systems with multitasking functions,
The program for each task was placed on a memory device on the system based on the address information of the task program and was executed sequentially.

Since each task of the instruction code section to be executed operates in parallel, it is also possible to execute programs of the same instruction code section on the memory device (reentrant program).

When multiple tasks execute the same instruction code, when tracing the target task, the user determines and obtains the trace information of the target task from the traced information.

[Problem to be solved by the invention]

The conventional tracing method in a multitasking environment described above is performed only for one task, and when multiple tasks execute the same instruction code, the user must judge and obtain information about the task from the traced information. Therefore, it is not possible to focus on a specific task, the trace results are mixed, and there is a drawback that normal tracing cannot be performed for each task.

An object of the present invention is to eliminate the drawbacks of conventional tracing methods in a multitasking environment and to provide a tracing method that enables tracing for specific tasks.

[Means to solve the problem]

The multitask tracing method of the present invention traces the system status in a system having a multitasking function, learns task switching within the system, and retains trace information in a trace area for each task by task switching. , has a function to refer to the trace information of each task.

[Example 1] Example 1 of the present invention will be described with reference to the drawings.

This embodiment shows an example in which the present invention is applied to a microfum computer device.

FIG. 1 is a block diagram showing a microcomputer device including a multitask trace device 104, which is an embodiment of the present invention. This embodiment is an apparatus that applies the multitask tracing method of the present invention to trace a specific task within a multitask being executed by a microcomputer device.

Figure 2 shows the multitask trace device 1 in Figure 1.
FIG. 2 is a block diagram showing details of 04.

In the device shown in the figure, the trace device 202 is the means for tracing the system state in the claims, and the means for notifying the switching of tasks within the system is the current task monitor signal line 103. The multitask trace information holding device 201 is a means for holding trace information in a trace area for each task and referring to the trace information for each task.

It is assumed that the microcomputer device in this embodiment is operating in a multitasking environment. A program for each task is stored in the memory device 101 in FIG. 1, and task control information for each task is also stored as information in each task control block (hereinafter referred to as TCB) in the memory device 101. It is assumed that the central processing unit 102 performs multitasking task switching by changing the address value of the TCB currently being executed.

In FIG. 1, the central processing unit 102 includes a memory device 1
The programs for each task stored in 01 are executed. In this case, when the task is switched, the base address value, which refers to the start address of the TCB in the central processing unit 102 and is the start address of the TCB of the task register indicating control of the task being executed, is changed. The central processing unit 102 uses the current task monitor signal line 103,
Send the TCB base address value. The multitask tracing device 104 recognizes task switching by referring to the base address value sent via the current task monitor signal line 103.

In FIG. 2, a multitask trace information holding device 201 holds trace information regarding a program for each task corresponding to the TCH information for each task stored in the memory device 101, and a multitask This device has a function of selecting trace information for each task according to the TCH base address information of the monitor signal line 103, and distributes each trace information from the trace device 202. It is assumed that the trace information for each task in the multitask trace information holding device 201 holds address information for performing tracing in the program of each task.

In FIG. 1, when tasks A, B, and C are executed as a multitask, task A is stored in the memory device 101.
, B, and C are stored, and the multitask trace information holding device 201 stores TCBs for tasks A, B, and C.
There is a storage area for trace information for The switching of each task can be selected by the central processing unit 102 from the base address information of the TCB in the memory device 101. If trace information of the instruction code portion of task B is desired, the trace information is stored in the trace information holding unit for task B in the multitasking trace information holding device 201.

When the central processing unit 102 is executing tasks A, B, and C in a multitask manner, the task register indicating control of the internally executing tasks is changed to the TC for the task when the task is changed.
B's base address is set and changed. The multitask trace method uses the current task monitor signal line 103.
is used to know that the task has been switched and import it into the multitask trace device 104. The multitask trace information holding device 201 stores the TC of the currently executing task taken in from the current task monitor signal line 103.
Based on the base address of H, the currently executing task (A,
B and C), selects trace information for the task currently being executed, and distributes each trace information from the trace device 202. When the task is switched to task B in the central processing unit 102, the trace information selected by the multitask trace information holding device 201 is switched to the trace information for task B. This makes it possible to trace only specific tasks.

If the instruction code part of task A executes the same memory program as the instruction code part of task B, and if you want to trace task B, the address to be traced is task A in the memory device 101, The same memory address is used in B, but tasks A and B are switched by the multitasking trace information holding device 201, and the central processing unit 10 stores the address where the same instruction code in the memory device 101 is to be traced.
Even if task 2 is executed, if the current task is task A+7), tracing is not performed, but when switching to task B, tracing is performed. This makes it possible to trace only the execution of a specific task in multitasking that executes the same instruction code in memory.

Figure 5 is a flowchart of a multitask tracing method that traces specific n tasks, assuming that there are m tasks from task l to task m, and that these tasks are being executed in multitask mode. be. However, n is an integer of 0 or more and 1m or less.

[Example 2] A second embodiment of the present invention will be described with reference to the drawings.

This embodiment shows an example in which the present invention is applied to a microcomputer device under a multi-task monitor program environment.

FIG. 3 is a block diagram showing a microcomputer device including a multitask trace device 304 according to an embodiment of the present invention, and in which a multitask monitor program performs multitask task control. This example is
This device applies the multitask tracing method of the present invention to trace a specific task within a multitask being executed on a microcomputer device under a multitask monitor program environment.

The difference between the first embodiment and the second embodiment is that the multitasking task switching information is stored in the central processing unit 10 in the first embodiment.
In the second embodiment, it is directly referenced from the monitor program that controls multitasking.

FIG. 4 shows the multitask trace device 3 in FIG.
FIG. 2 is a block diagram showing details of 04.

In the device shown in the figure, the trace device 402 is the means for tracing the claimed system state, and the means to know the switching of tasks within the system is the current task monitor signal line 303. The multitask trace information holding device 401 is a means for holding trace information of each task in a task trace area and referring to the trace information of each task.

The microcomputer device in this embodiment operates in a multitasking environment in which a multitasking monitor program is operating in a supervisor mode in which each task is all executed under the supervision and control of the multitasking monitor program. Suppose there is. The multitask monitor program is a monitor program that resides in the memory device 301 and performs task control of multitasks. A program for each task is stored in the memory device 301, and task control information for each task is also stored as information for each TCB in the memory device 301. In Example 2,
The multitask monitor program in the memory device 301 controls the central processing unit 302 to switch tasks by managing the address value of the TCB of the task information holding memory section in the currently running multitask monitor program.
It is assumed that multitasking tasks are to be switched.

In FIG. 3, the central processing unit 302 includes a memory device 3
The programs for each task stored in 01 are executed. In this case, when the task is switched, the base address value of 'i'CB in the task information holding memory section in the multitask monitor program in the memory device 301 is changed. The multitask tracing device 304 recognizes task switching by referring to the value. The current task monitor signal line 303 is a signal line that monitors this task information holding memory.

In FIG. 4, a multitask trace information holding device 401 holds trace information regarding a program for each task corresponding to the information of the TCB for each task stored in the memory device 301. This device has a function of selecting trace information for each task according to the base address information of the TCB of the monitor 303, and distributes each trace information from the trace device 402. Multitasking trace information holding device 401
It is assumed that the trace information for each task in the table holds address information for tracing within the program of each task.

In Figure 3, under the multitasking monitor program,
When tasks A, B, and C are executed as a multitask, the memory device 301 contains TCs for tasks A, E, and C.
In the multitask trace information holding device 401, there are trace information storage areas for tasks A, B, and C. The switching of each task can be selected by the memory device 301 from the base address information of the TCB in the memory device 301. If you want to trace the instruction code of task B,
The trace information is stored in the trace information holding unit for task B in the multitask trace information holding device 401. Task A on the multitasking monitor program
, B, and C are executed by multitasking, the internal task information holding memory section that indicates the control of the task being executed is
When a task is changed, the TCH base address for the task is set and changed. Current task monitor signal line 3
03, the value of the task information holding memory section is referred to and taken into the multitask trace device 304. The multitasking trace information holding device 401 identifies the currently executing tasks (A, B, C) based on the base address of the TCB of the currently executing task fetched from the current task monitor signal line 303, and identifies the currently executing task (A, B, C). The trace information for each task is selected and each trace information from the trace device 402 is distributed. When the central processing unit 302 switches the task to task B, the trace information selected by the multitask trace information holding device 4010 switches to the trace information for task B. This makes it possible to trace only specific tasks.

If the instruction code part of task A executes the same memory program as the instruction code part of task B, and if you want to trace task B, the address to be traced is task A in the memory device 301, The same memory address is used in B, but tasks A and B are switched by the multitask trace information holding device 401, and the central processing unit 30 stores the address in the memory device 301 where the same instruction code is to be traced.
Even if 2 is executed, if the current task is task A, tracing will not be performed, and when switching to task B,
A trace is performed. This makes it possible to trace only the execution of a specific task in multitasking that executes the same instruction code in memory.

〔Effect of the invention〕

As explained above, the present invention makes it possible to trace a specific task in a multitasking environment, and to trace a specific task for the same instruction code that is simultaneously executed by multiple tasks. can.

2 is a block diagram showing details of the multitask trace device of FIG. 1, and FIG. 3 is a block diagram showing a microcomputer device equipped with a trace device, and FIG. FIG. 4 is a block diagram showing a microcomputer device under a task monitor program environment, FIG. 4 is a block diagram showing details of the multitask tracing device of FIG. 3, and FIG. 5 is a flow chart of the present invention.

101.301・River...Memory device, 102,302・
...Central processing unit, 103,303 Old... Current task monitor signal line, 104,304 Group Multi-task trace device, 201,401 Old... Multi-task trace information holding device, 202 ,402...
...Trace device.

Agent: Patent Attorney Susumu Uchihara

[Brief explanation of the drawing]

Figure 1 is a diagram of a multitasking environment according to the first embodiment of the present invention. Kaya 3 times etc. 2 Bacteria 4th Cook

Claims (1)

[Claims] In systems with multitasking functionality, trace the system status, know when tasks are switched within the system, maintain trace information in the trace area for each task by switching tasks, and refer to the trace information for each task. A tracing method that is characterized by executing tracing for a specific task.