JP2001092676A - Task management system in integrated program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a task management system of an integrated program for operating processing whose real time processing is required in a real time by interruption. SOLUTION: This system is provided with interruption processing parts 1a, 1b, 1c, and 1d corresponding to each interruption factor, an interruption managing part 2 for managing interruption at the time of receiving an interruption request signal outputted from the interruption processing parts, a flag preserving part 4 to be managed according to a signal from the interruption managing part 2 for storing an interruption request flag for each interruption factor, and task processing parts 5a, 5b, 5c, and 5d for operating task processing according to a signal from the interruption managing part 2. Thus, processing whose real time processing is required can be operated by the interruption processing parts 1a, 1b, 1c, and 1d, and the other processing can be operated by the task processing parts 5a, 5b, 5c, and 5d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a task management system for embedded programs processed by interruption.

[0002]

2. Description of the Related Art Conventionally, task management for processing a task having an interrupt request by an embedded program is performed by interrupt processing units 7a, 7b and 7c corresponding to interrupt request signals of interrupt factors A, B, C and D shown in FIG. , 7d do not operate at the same time, only one of them operates.

The priorities of the tasks A, B, C and D executed by the interrupt factors A, B, C and D are determined by a preset interrupt vector table. Then, the task is started in accordance with the interrupt factor, and if an interrupt factor of another task occurs during the processing, the task is immediately processed according to the priority order of the flags set in the vector table (interrupt flag register). , Or whether to execute after the task currently being executed is completed. As shown in FIG. 2, there is a one-dimensional interrupt flag register for clarifying a task waiting to be executed.

[0004]

In the above-described conventional task management method, when a task is directly activated by an interrupt factor, the task operates while maintaining the priority according to the interrupt factor. During the operation of the task, all interrupts with lower priorities are postponed.

In this case, since the timing at which the interrupt factor occurs is ignored, the real-time processing is performed even if a low-priority interrupt whose processing is postponed includes a part that requires real-time processing. Absent.
As described above, when a task is directly activated by an interrupt factor, there is a problem that it is not possible to cope with a case where there are a plurality of tasks that need to be processed according to the timing at which the interrupt factor occurs.

In the above-described conventional task management method, the register for storing the occurrence of the interrupt factor is one.
Due to the dimension, even if an interrupt of the same factor occurs a plurality of times, only the first one is executed, and the second and subsequent processes are not performed.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to provide a task management system for an embedded program which is processed by an interrupt capable of real-time processing of a processing requiring real-time processing. To provide.

Another object of the present invention is to provide a task management system capable of processing even if an interrupt of the same factor occurs a plurality of times.

[0009]

A task management system in an embedded program according to the present invention receives respective interrupt processing units provided corresponding to respective interrupt factors, and receives an interrupt request signal output from the interrupt processing unit. An interrupt management unit that manages interrupts; a flag storage unit that is managed by a signal from the interrupt management unit and stores an interrupt request flag for each interrupt factor; and a task processing unit that performs task processing by a signal from the interrupt management unit The interrupt processing unit performs a process that requires real-time processing, and the task processing unit performs other processes.

[0010] In the task management system,
The flag storage section is constituted by a two-dimensional matrix register.

In each of the task management systems, an operation flag register indicating a task currently being executed is provided, and when the task processing unit starts executing a task corresponding to each interrupt factor, the operation flag in the operation flag register is set. In this configuration, a flag of a task is set up, and when the execution of the task is completed, the flag of the task is set down.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A task management system in an embedded program according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a task management system according to an embodiment of the present invention.

As shown in the figure, the task management system of the embodiment comprises an interrupt processing unit 1a, 1b, 1c, 1d corresponding to each of external interrupt factors A, B, C, D, and a timer interrupt at a fixed period. , A timer register 3 for storing a flag for activating a task, tasks A, B, C,
Task processing units 5a, 5b, 5 for executing the respective tasks of D
c, 5d, and an operation flag register 6 for storing flags indicating the operation states of the tasks A, B, C, and D.

In the above configuration, if an external interrupt B occurs, the corresponding interrupt processing unit 1b is activated to perform near real-time processing (strict real-time processing is not required, but some real-time processing is required). After performing (process), a flag for requesting execution of task B is set.

The interrupt management unit 2 checks the execution request flags of the interrupt processing units 1a, 1b, 1c, and 1d in a timer interrupt process that is generated by the timer 3 at a fixed period. Save in register 4.

Then, the operation status of each task is confirmed with reference to the operation flag register 6, and one of the appropriate task processing units 5a, 5b, 5c and 5d is selected according to the contents of the flag stored in the matrix register 4. The task is started, and the flag in the matrix register 4 corresponding to the task is cleared.

The started task processing units 5a, 5b, 5
Either of c and 5d raises the operation flag of the own task in the operation flag register 6 to make it clear that the task is in operation. While this operation flag is active, the interrupt management unit 2 does not activate the same task. Any of the started task processing units 5a, 5b, 5c, and 5d clears the operation flag of the own task in the operation flag register 6 when ending the task.

[0018]

According to the task management system in the embedded program of the present invention, the processing immediately performed by each external interrupt is limited to only the near real-time processing, and other tasks are performed separately by setting flags.

Accordingly, the time required for interrupt processing due to an external interrupt is significantly shortened, and does not hinder quasi-real-time processing when another external interrupt occurs. The task to be started is specified by a flag, and
Storing in the dimensional flag storage matrix register can satisfy a plurality of task operation requests.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a task management system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional task management system.

[Explanation of symbols]

 1a, 1b, 1c, 1d Interrupt processing unit 2 Interrupt management unit 3 Timer 4 Matrix register 5a, 5b, 5c, 5d Task processing unit 6 Operation flag register 7a, 7b, 7c, 7d Interrupt processing unit

Claims (3)

[Claims] An interrupt processing unit provided for each interrupt cause, an interrupt management unit for managing an interrupt in response to an interrupt request signal output from the interrupt processing unit, A flag storage unit that is managed by a signal and stores an interrupt request flag for each interrupt factor; and a task processing unit that performs a task process based on a signal from the interrupt management unit. A task management system in an embedded program configured to perform the other processing by the task processing unit. 2. The task management system according to claim 1, wherein the flag storage unit includes a two-dimensional matrix register. 3. An operation flag register indicating a task currently being executed, wherein when the task processing unit starts executing a task corresponding to each interrupt factor, a flag of the task in the operation flag register is activated. 3. The task management system according to claim 1, wherein when the execution of the task is completed, the flag of the task is set to fall.