JPS6129966A - Monitoring method in exchange of message between computers - Google Patents

Abstract

PURPOSE:To communicate the unusual condition with a computer by which message is transmitted, from a transmitting computer to other computer and to exchange effectively messages by providing a timer, and counting time till a response message transmitted from the transmitting computer is received. CONSTITUTION:In the case of transmitting a message from a computer 1 to a computer 2, a transmitting device 11 drives a timer 13, which counts during a fixed time. When the computer 2 receives a message from the computer 1, it takes the message in a message receiving area 25 through a receiving device 22 to send out a response message to the computer 1 through a sending device 21. The receiving device of the computer 1 receives it and resets the timer 13. In this case, when there is something wrong with the computer 2, and time is out without resetting the timer 13, the computer 1 detects the unusual condition of the computer 2, and notifies to other computer 3 through the device 11 as well as taking a necessary inner processing. Thus, sending out a message from the computer 3 to the computer 2 is stopped immediately, so that the effective exchange of messages can be made between the computers.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for mutually exchanging messages in a computer system composed of a plurality of computers.

[Background of the invention]

As a method of mutually exchanging messages, there is a method, for example, as shown in EIToku-Ping No. 58-45053, in which messages are limited to computers that send and receive messages, and a timer is used to monitor the process from message sending to response message reception. Are known.

This method detects that the destination computer is abnormal when the source computer times out, and stops sending messages to the destination computer until the destination computer recovers. Other computers are not notified that the computer is abnormal, and other computers cannot detect the abnormality of the destination computer until they send a message to the destination computer.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an effective method for exchanging messages between computers in which a sending computer notifies a thin needle calculator of an abnormal state of a destination computer.

[Summary of the invention]

According to the present invention, the computer that received the message sends a response message to the computer that sent the message to notify that it has received the message, and the computer that sent the message uses a timer to receive the response message at the same time as sending the message. If the timer is not reset by receiving a response message, it will time out after a certain period of time, recognize that the destination computer is in an abnormal state, take corrective action between the sending and receiving computers, and then The system is designed to send a message to the thin needle calculator to notify the abnormal state of the destination computer.

[Embodiments of the invention]

The present invention will be explained below using examples.

The figure shows the monitoring method for message exchange between computers according to the present invention for three computers. It is assumed that the three computers 1, 2 and 3 have the same structure. A case will be described in which a message is sent from computer 1 to computer 2, that is, computer 1 is the sending computer, computer 2 is the destination computer, and computer 3 is the fine needle calculator.

A request to send a message to computer 2 occurs on computer 1, and the sending device 11 of computer 1 creates a message.
After storing the message in the message sending area 14, a message receiving command is sent to the receiving device 22 of the computer 2. At the same time, the transmitting device 11 of the computer 1 drives the timer 13, and the timer 13 counts for a certain period of time. The receiving device 22 of the computer 2 takes in the message stored in the message sending area 14 of the computer 1 to the message receiving area 25Vc of the computer 2, and sends a response message to the receiving device 12 of the computer 1 through the sending device 21. do. The receiving device 12 of the computer 1 receives the response message from the computer 2, resets the timer 13, and the transmission and reception of the message between the computers 1 and 2 is completed.

If there is an error in the above processing, that is, computer 2
When an abnormality occurs in the computer 1 and the timer 13 of the computer 1 times out without being reset, the abnormality in the computer 1 and the computer 2 is detected, and internal abnormality measures are taken in the computer 1, and the sending device 11 sends detailed information. The receiving device 32 of the pointer calculator 3 is notified of the abnormality of the calculator 2.

In addition, 15, 25.35H message reception area, 23
．． 33 is a timer, and 24.34 is a message sending area.

〔Effect of the invention〕

According to the present invention, an abnormality in the transmitting optical calculator can be recognized not only by the sending computer but also by the fine needle calculator at the same time, so it is possible to immediately stop sending a message from the fine needle calculator to the abnormal computer. , other reduction machines can take early action.

[Brief explanation of drawings]

The figure is a system diagram showing a monitoring method for message exchange between computers according to the present invention.

Claims (1)

[Claims] 1. In a computer system in which a plurality of computers exchange messages with each other, when a destination computer receives a message sent from a source computer, the destination computer transmits the response message to the source computer. The source computer monitors the response time from the time it sends the message to the time it receives the message from the destination computer and the response message sent, and determines whether the response time is acceptable. If the response time is within the allowed time, it is assumed that the response was received normally and the monitoring of the response time is discontinued; if the response time exceeds the allowable time,
Message exchange between computers, characterized in that the destination computer detects an abnormality, performs internal processing corresponding to the abnormality, and sends an abnormal state notification message of the destination computer to another computer. Monitoring method.