JPS61120225A - Task starting method of electronic computer system - Google Patents

Abstract

PURPOSE:To identify easily a part set by a task from an unset part by using previously an initialization pattern set to initialize the work area of the corresponding task when the task initialization is started. CONSTITUTION:Whether a resident or non-resident task is discriminated by an ID to a task control table through the task start processing having a work area initializing function when the task initialization is started. In case of a non-resident task, a program is read onto a main memory from an auxiliary memory with reference to a UNO, an SADDR, etc. A state flag is decided during execution of a task to discriminate the initial start from the restart of the task. Then the contents of a register under an interruption state are recovered in a restart mode to reset the control to the task. While a flag showing the propriety for initialization of a work area initialization table is decided in an initialization start mode. The head address of the work area is calculated when the initialization is needed for setting an initialization pattern PATN for work area capacity. Then the control is shifted to the task.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a task activation method in an electronic computer system.

[Background of the invention]

In the conventional task starting method, the work area is not initialized when the task is initially started.

There are two types of tasks: resident tasks, whose program always resides in the main memory, and non-resident tasks, which read the program stored in the auxiliary storage device into the main memory when the task is initially activated.

The program in the auxiliary storage device has an instruction part (glossy part) and initial value data, and the task work area (work area) is secured in the main memory when the task starts. The content is unspecified.

If the task is a resident task, the work content at the time of task startup is as follows:
This is the work content at the end of the previous operation, and in the case of a non-resident task, it is the residual data of the task that was operated last time on its main memory.

In this way, when a task's work area is not initialized when the task is started, when analyzing task work data during program debugging, it is necessary to use data set by the task or residual data in main memory. The disadvantage is that it is difficult to identify whether

(New Edition Information Processing Handbook Publisher: Ohmsha 1933)
(Published on March 30, 2015, 1st edition, p. 132) [Object of the Invention] An object of the present invention is to easily divide the work area of a task into a portion set by the task and a portion not set. The objective is to provide a method of identification.

[Summary of the invention]

According to the present invention, when a task is initially started, the work area of the corresponding task is set in a preset initialization pattern.
By initializing it, it is possible to easily identify the portions set by the task and the portions not set.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 4 shows the task structure. Task work area length memory section WL, program section C8ECT, and fixed data section F
XD and register information storage section 08WK when a task is interrupted
It is composed of a task work area WK.

FIG. 3 shows the structure of the task control table.

There is a task execution prohibition flag D1 a temporary stop state flag W1 an execution state flag R1 a start request flag Q state flags.

In addition, there is a 7-lag ID that identifies resident tasks and non-resident tasks.
, the start address storage part L on the main memory where tasks are placed
P, Relative address storage unit WTP from the beginning of the task to the beginning of the work area, In the case of a non-resident task, unit number storage unit U of the auxiliary storage device in which the relevant program is stored.
It is composed of an address storage section 5ADDR in the NO1 auxiliary storage device.

FIG. 2 shows a task work area initialization table, which is placed on the main memory. This table is composed of a work area initialization execution necessity flag E, which determines whether or not to initialize the work area of a task when the task is initially activated, and an initialization pattern PATN.

FIG. 1 shows a flowchart of a task activation processing program having a work area initialization function at the initial activation of a task according to the present invention.

Based on the ID in the task control table 301, it is determined whether the task is a resident task or a non-resident task (201). For non-resident tasks, 301 UNO, 5ADDR.

LPt-Reference is made to read the program from the auxiliary storage device onto the main memory. (202) During the execution of the task 301, the status flag Re is determined to determine whether the task is initially activated (R==0) or restarted (R,=1). (203) When the task is restarted, the contents of the register at the time of suspension are restored from 08WK of 401, and control is returned to the task. (2
08) When a task is initially activated, the initialization necessity flag Et- of the task work area initialization table 101 is determined to determine whether initialization is necessary (E=1) or not (E=O). (2
04) If task work area initialization is required, LP 301
and WTP are added to calculate the work area start address of the corresponding task. (205) The initialization pattern PA'rN of 101 is set for the work area capacity (contents of WL 401) from the work area start address obtained in 205 (206).

The task execution state flag of 301 is set to Rt-1, and task busy control is passed. , (207) [Effect of the Invention] According to the present invention, depending on whether the contents of the task area are initialization butter/data or other data, the work area can also be divided into a part set by the task and a part not set. can be easily identified.

[Brief explanation of drawings]

Fig. 2 is a diagram showing the configuration of a table for initializing the task work area, Fig. 3 is a flowchart of the task activation processing program of the present invention, Fig. 3 is a diagram of the task control table, and Fig. 4 is a diagram showing the task structure. It is. 101...Task work area initialization table, 2
04-206...Task work area initialization section of the task activation processing program.

Claims (1)

[Claims] 1. Provide a table with a task work area initialization execution necessity flag and an initialization pattern of the task work area, and when a task is initially started, refer to the table, and if initialization execution is required, the work of the task is A method for starting a task in a computer system, characterized in that an area is initialized using the initialization pattern.