JPH0328933A - Task control method - Google Patents

Abstract

PURPOSE:To facilitate the development of an interruption driver soft by handling the interruption driver soft equivalently to a general application task with the use of a means which handles an external interruption signal via an OS kernel and an interruption task control table. CONSTITUTION:The interruption signal produced from an external input/output device 2 is transmitted to a real time operating system OS kernel 3. Then the task control 4 is started, and the preferential level of an interruption task 7 is taken out and compared with the preferential level of the working task by referencing to an interruption control table 5 and a control block belonging to the corresponding task 7. Then the task corresponding to the preferential level is carried out. thus the control is shifted to the task 7 under the control of the kernel 3 and the control 4, and the corresponding interruption process is carried out. Consequently, an interruption processing program is easily developed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a task control method for controlling interrupts in a computer system.

2. Description of the Related Art Traditionally, a real-time operating system (OS) has been used to control tasks and interrupts, but here the tasks and interrupt processing programs are clearly separated and controlled. For example, FIG. 4 shows an interrupt driver 13 designed for a conventional task control method.
Control is passed to , individual interrupt handling is done, and then O
Return from interrupt processing via S kernel l4. In other words, the interrupt driver 13 is handled as a non-task program.
handled and managed independently from general tasks.

Problems to be Solved by the Invention However, in the conventional task control method, the OS kernel function is complicated because the interrupt processing program is managed independently from the task.Furthermore, the interrupt processing program is not compatible with all the interrupt processing programs prepared in the real-time OS. However, the use of system calls that cause a transition to a held state is prohibited, making it difficult to develop interrupt processing programs.

Means for solving the problem In order to achieve the above purpose, the interrupt processing program is registered as a task with a specified priority level at the time of initial registration, and the interrupt cause and task identifier are registered in the interrupt management table shown in Figure 2. be done. Control is passed to the interrupt processing program by an external interrupt signal, but at this time, control is not passed directly to the interrupt processing program, but control is passed to the OS kernel, and the corresponding interrupt processing program is handled as a task, and the priority level is executed. If the task inside is also higher, the interrupt handling task is executed,
If the priority level is low, it is placed in a queue and made to wait in a cabinet where it can be executed.

When the execution of the interrupt processing task is completed, the next task to be executed is selected and executed under the control of the scheduler of the OS kernel.

Effects The present invention uses means for handling external interrupt signals via the OS kernel and an interrupt task management table to treat interrupt driver software in the same way as general application tasks, leading to the effect of facilitating the development of interrupt driver software. It is something.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a block diagram showing a schematic configuration of the task control method of the present invention. As shown in FIG. 1, the computer system 1 is composed of a computer system 1 and an external input/output device 2. It is structured as follows.

Next, the operation of the above configuration will be described. An interrupt signal generated from the external input/output device 2 is transmitted to the OS kernel 3, the task control 4 is activated, and processing is performed according to the procedure shown in FIG. That is, the interrupt management table 5 (here, the interrupt processing program is registered as a task with a specified priority level at the time of initial registration, and the interrupt cause and task identifier are registered in the interrupt management table shown in FIG. 2). Refer to the control block attached to the corresponding interrupt driver task 7, extract the priority level of the interrupt task 7, compare it with the priority level of the currently running task, and select the task according to the priority level. Let it run. When the priority level of a task corresponding to an interrupt is high, the interrupt task is put into a RUN state and is activated, and when the priority level is low, the interrupt task is connected to the ready key 11 and execution is awaited. In this way, control is passed to the interrupt processing task 7 under the control of the OS input channel 3 and task control 4, and the corresponding interrupt
Input processing is performed.

Effects of the Invention As described above, the effects of the present invention are that interrupts are fundamental to controlling various devices, and that using the task control method of the present invention facilitates the development of an interrupt processing program.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the task control method according to the present invention, FIG. 2 is a table for comparing and managing interrupt factors and tasks, and FIG. 3 is a flowchart showing the processing procedure of the present invention. , FIG. 4 is a Bronnok diagram showing an outline of a conventional task control method. 1... Computer system, 2... External input/output device, 3
...OS kernel, 4...Task control, 5...Interrupt task management table, 6...Working main memory, 7
... Interrupt, b interrupt task, 8-9... Application task, 1l... External input/output device, 12... Computer system, 13... Interrupt driver, 14... O
S kernel, 15...Task control, 16-17...
application task.

Claims (1)

[Claims] It has an interrupt control program that responds to external interrupt sources, this interrupt control program is managed using the same task control block as a general task, and the interrupt control program enters the interrupt holding state when it is initially started, and when an interrupt occurs, it is specified. A task control method characterized in that the task is started as a task with a specified priority level, and an interrupt control program is executed.