JPH01236305A - Machine controlling method - Google Patents

Abstract

PURPOSE:To eliminate the necessity for a timer and, at the same time, to surely prevent interruption for another task while one instruction is executed by performing task switching in the course of a main processing procedure, instead of performing in the course of an interruption processing procedure. CONSTITUTION:Whether or not the content of the status register 2 of a task pointed out by a task pointer 1 indicates an executing state is checked and, when the content does not indicate an executing state, the process is moved to the process S3. When the content indicates an executing state, on the other hand, the process is moved to the process S2. Then the instruction indicated by the program counter 3 pointed out by the task pointer 1 is analyzed and executed. When the execution is completed, the task pointer 1 is increased and the process is repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling a machine, and in particular to a method for controlling a computer-controlled machine.

[Conventional technology]

Next, a conventional machine control method will be explained in detail with reference to the drawings.

FIGS. 4(a) and 4(b) are flowcharts showing an example of a conventional machine control method.

The machine control method shown in FIGS. 4(a) and 4(b) includes an instruction reading means 30 for reading an instruction to be executed next by a task, an analysis means 31 for analyzing the instruction, and an execution means for executing the analyzed instruction. 32, and storage means 3 for saving the current state.
3, acquisition means 34 for acquiring the past state, and return means 35 for returning from the interrupt state.

Normally, the instruction reading means 30, the analysis means 31 . The execution means 32 is repeated, and when an interrupt is generated by the timer, the work is interrupted and the storage means 33 of FIG. 4(b) is executed. The acquisition means 34 and the return means 35 are executed.

[Problem to be solved by the invention]

The conventional machine control method described above requires a timer to obtain a certain time interval, and furthermore, the measures executed in the event of an interrupt are complicated and time-consuming, and the processing requires mutual exclusion between tasks. The drawback was that the program was complicated.

[Means to solve the problem]

The machine control method of the present invention includes (^) a storage means for storing the state of a task; (B) the above (
(A) determining means for determining whether the task is in an execution state or a standby state based on the content; (C) a reading means for reading an instruction to be executed next by the task when it is determined in (B) that the task is in an execution state; (D) Said (
(17) An execution unit that executes the instruction analyzed in (D) above.
(F) switching means for switching to another task after processing of one task is completed;

〔Example〕

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

FIG. 1 is a flow chart showing one embodiment of the present invention, and FIG.
FIG. 2 is a block diagram showing the configuration of the figure.

The machine control device shown in FIG. 2 has a task pointer 1,
It is configured to include a status register 2 and a program counter 3.

One status register 2 and one program counter 3 exist for each task.

FIG. 3 is a flowchart explaining the operation of this embodiment.

It is checked whether the contents of status register 2 of the task pointed to by task pointer 1 indicate the execution state.
Move to 2. (Sl) Analyze and execute the instruction pointed to by program counter 3 pointed to by task pointer 1. (S2) Increment task pointer 1. The procedure (S,) is repeated.

When switching tasks, it is only necessary to change the task and pointer, so no special processing such as storing the current state is required.

〔Effect of the invention〕

The machine control method of the present invention performs task switching within the main processing procedure instead of within the interrupt processing procedure.
The timer can be omitted, and since the processing of other tasks will never interrupt the execution of an instruction, there is no need to perform mutual exclusion.

[Brief explanation of the drawing]

FIG. 1 is a diagram corresponding to the claims of the present invention, FIG. 2 is a block diagram for explaining an embodiment of the present invention, and FIG. 3 is a flowchart 1 to 4 for explaining the operation of FIG. a), (b
) is a flowchart showing a conventional example. 1...Task pointer, 2...Status register, 3...Program counter.

Claims (1)

[Scope of Claims] (A) Storage means for storing the state of a task; (B) Judgment means for determining whether the task is in an execution state or a standby state based on the contents of (A); (C) An execution state in the above (B). (D) an analysis means for analyzing the instruction read in (C) above; (E) an analysis unit for analyzing the instruction analyzed in (D) above. A machine control method comprising: (F) a switching means for switching to another task after processing of one task is completed.