JPS6319959B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to rewriting storage contents in loop transmission storage. More specifically, a communication line is connected between multiple information processing devices in a loop, and information that is commonly used by each information processing device is constantly transmitted on the line loop, and each information processing device This is to avoid troubles related to rewriting information stored on the line in a system that can be referenced immediately when a device uses this information.

In loop transmission storage, commonly used information is continuously transmitted over a loop-shaped line, which allows information to be referenced in a short time.The communication line can also be used as a memory block, making effective use of space. can also be measured. In this case, when one information processing device changes its own state from one state to another, the problem is how to determine the timing to transmit the updated information to other information processing devices.
In a system in which an information processing device changes its state after transmitting its state to another information processing device through a loop transmission path, the other information processing device recognizes the change in state, that is, the change in memory content. If you refer to the previous state and take action before you know it,
Contradictions occur in processing between mutual information processing devices. Depending on the way the contradictions take place, it can become a deadlock situation where both parties are oppressing the other.

The purpose of the present invention is to take advantage of the characteristics of loop transmission storage that allows you to immediately refer to necessary information, and to
An object of the present invention is to provide a management method for a loop transmission storage system that eliminates problems when rewriting storage contents due to delays in information transmission.

In other words, the signal that is transferred endlessly through the transmission path as stored information is temporally divided into two parts, and each part is divided into information to be stored, one whose contents are scheduled to be updated, and one whose contents are not scheduled to be updated. It corresponds to things. In other words, among the groups of information that are transmitted endlessly, the first group contains those whose contents are not scheduled to be updated for the time being, and the second group contains those whose contents are scheduled to be updated in the near future. Something belongs to it. When an update schedule occurs in memory content, the terminal device to which the relevant information processing device is connected updates the corresponding memory content from the first group (the section for transmitting information that is not scheduled to be updated) to the first group. Move to the second group (section for transmitting information scheduled to be updated). In this way,
The information processing device that uses the stored information is notified in advance whether or not there is a plan to update the stored content.

Hereinafter, the present invention will be explained in detail using the drawings. FIG. 1 is a system configuration diagram for explaining the operation of the loop transmission storage system. Information processing devices 101, 105, and 109 are connected to a loop-shaped transmission path through terminal devices 103, 107, and 111. Transmission line 10 between each terminal station
4, 108, and 112 continue to endlessly transmit information to be stored. If information that is mutually used by each information processing device is continuously transmitted endlessly at high speed on a loop transmission path, necessary information can be immediately referenced. If the information processing device 101 sends its own status to the loop transmission path through the terminal device 103 and this information is transmitted endlessly through the transmission path, the information processing device 109 transmits this information through the terminal device 111. You can refer to the information. The information processing device 111 refers to the information, and then this information passes through the transmission path 112 to the terminal device 103.
When the information processing device 101 reaches the point where the content of the previously stored information is to be updated, the terminal device 103 updates the stored content, and the update is sent to the information processing device through the terminal device 111. 109
can be conveyed to. In other words, there is a slight delay when information updates are notified.

When the information processing device 109 tries to communicate with the information processing device 101 based on the information that it first refers to, the state of the information processing device 101 has already changed and it becomes unable to communicate with the information processing device 109. Situations may occur. 109 is 10
If you keep waiting only for the reply from 1, as long as this state of 101 continues, 109
will no longer perform any processing.

The present invention is intended to prevent such a situation from occurring, and sets rules when changing the content of stored information in a system that stores and references information using a loop transmission path. This is to prevent inconveniences from occurring due to updating of stored information in the transmission path.

FIG. 2 is a principle diagram for explaining the operation of one embodiment of the loop transmission storage system according to the present invention, and schematically shows temporal changes in the transmission signal at one point on the loop transmission path. It is. 201
and 211 are symbols indicating the end of stored information scheduled to be updated, and 202 and 213 are signals indicating the start of a portion storing information scheduled to be updated and the end of information not scheduled to be updated. Signals 205 and 215 indicate the start of stored information that is not scheduled to be updated for the time being. Signals 203, 204, 212, and 214 indicate stored information, and the first half has an address for distinguishing what kind of information it is, and the second half stores the information itself to be stored. Second
In Figure a, the signal transmitted between signals 205 and 202 is one that is not scheduled to be updated;
3,204 is not scheduled to be updated and is notified to each device connected to the loop transmission path. signal 2
There is no signal between 02 and 201, indicating that information scheduled to be updated is not stored.

Therefore, an information processing device that attempts to use information stored on a loop transmission path can know whether an update is scheduled or not when referring to the information. In other words, in a process affected by an update, the process can be started after waiting for the content of the information to be updated, without performing a process using information scheduled to be updated.

As described above, in the loop transmission storage system according to the present invention, update information can be obtained easily and immediately, the processing efficiency of the information processing device is improved, and necessary information can be obtained, which is a feature of the loop transmission storage system. Instant reference and efficient use of space remain intact.

The stored information circulates endlessly in the loop transmission path, and unless there is a schedule to update the information content,
2 and 201 are repeated in this order. When it becomes necessary to update either one of 203 and 204, the terminal equipment updates the signal scheduled to be updated from the section not scheduled to be updated, so that the signals are in the order shown in Figure 2b. It is necessary to move to an area scheduled for renewal.

For example, it is assumed that 203 is a numerical value indicating the memory capacity that can be freely used for information processing at the current location regarding the information processing device 105. The first half of 203 contains information indicating the memory contents of 105, and the second half contains the value of its capacity. In this embodiment, since the information processing 105 starts processing by itself, if another information processing device tries to limit the memory that can be freely used (even though the specific number is not determined), This means that the contents of 203 have an update schedule. Then,
This information will be moved to sections that are scheduled to be updated.

The state after the transfer is as shown in FIG. 2b, where only 214, which corresponds to 204 in a, exists in the interval between 215 and 213, where there is no update scheduled. In the section between 213 and 211 that is scheduled to be updated, there is 2, which corresponds to 203 in Figure 2a.
There are 12. In FIG. 2b, the data 214 is not scheduled to be updated, and the data 212 is data scheduled to be updated, and the data is transmitted through the loop transmission path.

Eventually, when the stored contents of 212 are updated by the terminal device in charge, the information stored in the section with an update scheduled is erased, the updated content is stored in the section with no update scheduled, and the information stored in the section with no update scheduled is erased. Information circulates in a sequence similar to that shown in Figure a.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram for explaining the operation of the loop transmission storage system, and FIG.
b is a diagram showing temporal changes in a signal. 101, 105, 109 are information processing devices, 10
3, 107, 111 are terminal devices in the loop transmission path, 102, 106, 110 are communication paths connecting the information processing device and the terminal devices, 104, 108, 112
is the loop transmission line that connects the terminal equipment. 11
3 is an arrow indicating the direction in which information is transmitted on the loop transmission path. 201, 202, 205, 21
1, 213, 215 are signals indicating the delimitation of information transmitted on the loop transmission path, and 203, 20
4, 212, and 214 are signals representing information stored on the loop transmission path.

Claims (1)

[Claims] 1 A management method for a loop transmission storage system in which multiple information processing devices are connected in a loop through a communication line and information to be stored is continuously transmitted endlessly, and the information transmitted and stored over the communication line is updated for the time being. A management method for a loop transmission storage system characterized by transmitting and storing information separately into information that is not scheduled and information that is scheduled to be updated.