JPH01181130A - Task start system for real time os - Google Patents

Abstract

PURPOSE:To omit the cycle start control for other tasks in a user task by registering previously the cycle start intervals and the task names into a register table. CONSTITUTION:Both the cycle start intervals and the task names are previously registered into a register table 11. A table production part 10 refers to the contents of the table 11 to produce an interval table 12 and a task information table 13. A cycle start detecting part 30 searches the table 12 for each prescribed time and reads a task name and a task starting method out of the table 13 if an on-bit is detected. Then the part 30 transfers the control to a queuing register part 40 to start the task.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a task activation method for a real-time OS, and particularly to a task activation method for a real-time OS that periodically activates user tasks at regular time intervals.

[Conventional technology]

In a conventional real-time OS task activation method, a periodic activation task is activated by issuing a macro command to the real-time OS using the periodic activation interval and task name within a user task as parameters. (References Nikkei Data Pro Microcomputer MC-
510-75 [Problems to be solved by the invention] The task activation method of the conventional real-time OS described above is
Since a user task periodically activates a task by requesting the OS, it is necessary to control the activation of other tasks within the user task, resulting in a complicated user program.

[Means for solving problems]

The task activation method of the real-time OS of the present invention includes a means for registering the periodic activation time interval and task name on the system management table of the real-time OS, and means for determining the activation method of the task registered on the management table and determining the activation method for the task registered on the management table. and means for activating the task at intervals.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

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

A table generation unit 10 is activated when a real-time OS (hereinafter referred to as OS) system is initialized, and generates an interval table 12 and a task information table 13 by referring to a registration table 11.

The interval timer processing section 20 runs every time an interval timer interrupt occurs, and passes processing to the periodic activation detection section 3o. When the periodic activation detection unit 30 detects a periodic activation task, it passes control to the waiting registration unit 40 to activate the task, and if there is no activation task, the process is transferred to the interval timer processing unit 20.

FIG. 2(a) shows the contents of the registration table 11, which is a table composed of task activation intervals and task names for each periodic activation task.

Figure 2 (b) shows the contents of the interval table, where the vertical direction corresponds to each interval, and the horizontal direction corresponds to the task that starts at each interval, and if there is an activated task, the bit at that position is ON.
It has become.

FIG. 2(C) shows the contents of the task information table 13,
There is a table for each interval, the vertical direction corresponds to the horizontal direction of the interval table 12, and the horizontal direction is composed of the task activation method and task name.

Next, the operation will be explained in detail with reference to FIGS. 1 and 2.

First, the table generation unit 10 is activated by the OS at system initialization.

The table generation unit 10 refers to the interval data in the registration table 11 and turns on the bit position τ corresponding to each task in the interval table 12, and also refers to the interval table 12 and the registration table 11 to Register the task startup method and task name in the table corresponding to the interval.

Next, the table generation section 10 passes the processing to the OS, and when system initialization is completed, the interval timer processing section 20 runs every time an interval timer interrupt occurs and starts the periodic activation detection section 30.

The periodic activation detection unit 30 counts time in units of interval timer intervals, searches the interval table 12 to determine whether there is a periodic activation task for each count time, and if there is an ON bit, the task information table 1 corresponding to the ON bit is searched.
Get 3.

Next, the activation method and task name of the periodically activated task are acquired from the task information table 13, and the control is executed by the waiting registration unit 4.
Pass to 0. Furthermore, the periodic activation detection unit 30 uses the interval table 1
2 is searched, the above operation is repeated until there are no more ON bits, and control is returned to the interval timer processing section 20.

The appointment registration unit 4o registers the task in the activation waiting queue according to the task activation method, and returns the process to the periodic activation detection unit 30.

The above operation is repeated for each interval timer interrupt, and the periodic activation task is activated at every interval specified in the registration table 11.

〔Effect of the invention〕

The task activation method of the real-time OS of the present invention allows easy creation of user tasks because there is no need to perform periodic activation control of other tasks within the user task by registering the periodic activation interval and task name in the registration table. It has the effect of becoming

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG.
g(a) to (c) are schematic diagrams showing the contents of each table shown in FIG. 1; 10...Table generation unit, 11...Registration table,
12... Interval table, 13... Task information table, 20... Interval timer processing section, 3o...
Periodic activation detection unit, 40...meeting registration unit. Agent Patent Attorney Oto Uchihara

Claims (1)

[Claims] means for registering time intervals and task names to be periodically activated on a system management table of a real-time OS; and means for determining an activation method for the tasks registered on the management table and activating the tasks in units of time intervals. A task starting method for a real-time OS characterized by including: