JPH03140037A - Network time synchronizing equipment - Google Patents

Abstract

PURPOSE:To eliminate the need for the adjustment between computers by utilizing one clock in common so as to obtain a time in order to synchronize the time between the computers on a local area network. CONSTITUTION:The equipment consists of a time request section 10, a request reception section 20, a message control section 30, a request message transmission section 31, a reply message reception section 32, a reply message processing section 33, an end request section 34, a display section 35, a console 36, a clock calculation section 40, a time response section 50, a processing end section 60, communication sections 70, 71, a request message reception section 80, a message control section 90, a request message processing section 91, a reply message transmission section 92, an end request section 93, a time acquisition section 100, and a time generator 110. When the processing requiring the present time is caused, the same time is obtained for all computers on the network without adjustment between the computers by using one clock only.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to time synchronization means for computers forming a local area network.

〔overview〕

The present invention is a time synchronization means for a plurality of computers, which makes it possible to eliminate the need for coordination between computers by commonly using one clock to obtain the time.

[Conventional technology]

Conventionally, when synchronizing the time on a local area network, the clocks in each computer were used, so -1 computers communicated with each computer to synchronize the time.

[Problem to be solved by the invention]

In such a conventional example, in order to synchronize the time between computers, the time has to be changed little by little and constant communication has to be carried out for adjustment.

The present invention aims to eliminate such drawbacks, and aims to provide a network time synchronization device that can obtain the same time without adjustment between computers on a network.

[Means for solving problems]

The present invention provides a network time synchronization device included in a system including a plurality of computers that communicate with each other via a local area network, in which a first computer, which is one of the computers, is equipped with a time generation device; The second computer, which is a computer other than the first computer, is equipped with a request message transmitting means for transmitting a time request message to the first computer when a process requiring the current time occurs, and the first computer The second computer includes a response message generating and transmitting means for generating a response message including time data generated by the time generating device in response to the message and transmitting the response message to the computer that transmitted the time request message, and the second computer transmits the response message after transmitting the request message. time calculation means for calculating the current time based on time data extracted from response messages that have arrived within a predetermined time; and processing for terminating the process that requires the current time when the response message has not arrived after the predetermined time has elapsed. It is characterized by having a termination means.

[Effect]

When there is a request to obtain the current time, it is accepted and
Sends a message requesting the current time to the time supply computer. When a request message is received, necessary data is extracted from the request message and processed accordingly. It obtains the current time from the time generator and sends the data to the request source, and also requests termination of the process if a normal request message cannot be received. When a response message is received from the time supply computer, necessary data is extracted from the response message and processed, an accurate time is calculated based on the extracted data, and the calculated time is returned to the time request source. When a normal response message cannot be received or when a response message is not returned even after waiting for a certain period of time, the process is requested to be terminated, and the process is terminated by displaying on the console that it could not be terminated normally.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the configuration of this embodiment. In this embodiment, as shown in FIG.
0, a request reception section 20, a message control section 30, a request message transmission section 31, and a response message reception section 32.
, a response message processing unit 33, a termination request unit 34,
Display units 35 and 1, console 36, time calculation unit 40, time response unit 50, processing termination unit 60, communication units 70 and 71, request message reception unit 80, message control unit 90, request message Processing section 91, response message transmitting section 92, termination request section 93, and time acquisition section 1
00 and a time generator 110. That is, this embodiment is included in a system having a plurality of computers that communicate with each other via a local area network, and the first computer, which is one of the computers, is connected to the time generator 11.
The second computer, which is a computer other than the first computer, is equipped with a request receiving unit 20, which is a request message transmitting means for transmitting a time request message to the first computer when a process requiring the current time occurs, and The first computer includes a request message transmitting section 31, and the first computer generates a response message containing time data generated by the time generator 110 in response to an incoming time request message, and transmits the response message to the computer that sent the time request message. The second computer includes a request message receiving unit 80, a request message processing unit 91, a time acquisition unit 100, and a response message transmitting unit 92, which are response message generation and transmission means, and is configured to receive a response that arrives within a predetermined time after transmitting the request message. The response message receiving unit 32, response message processing unit 33, time calculation unit 40, time response unit 50, which is a time calculation means that calculates the current time based on time data extracted from the message, and the response message has not arrived after a predetermined time has elapsed. A process termination unit 60 and a termination request unit 34 are provided as a process termination unit that terminates the process requiring the current time at the time of .

Next, details of the processing of this embodiment will be explained. FIG. 2 shows the processing procedure of the time requesting section 10.

When the time supply computer is activated, the time supply program is activated and waits for a time request message. When a process that requires the current time occurs on one computer, a time request program is executed on that computer. First, the request reception section 20 adds the request section of the current time (step 3
1). Next, the request is passed to the message control section 30.

The message control unit 30 issues a command to the request message transmitting unit 31 to create a time request message (step S2), and transmits the message to the time supply computer (step S3). After this, the requesting side waits to receive a response message from the time supply computer (step 34).

In the time supply computer, the request message receiving unit 80 receives the sent time request message (step 512).
), and passes it to the message control unit 90. The message control unit 90 issues a command to the request message processing unit 91 to retrieve the message (step 513). If the message is correct (step 514), the time acquisition unit 100
A command is issued to extract the time from the time generator 100 (step 515).

If it is not correct (step 314), an error is input in the response message (step 519). If the retrieved time is correct (step 516), a response message is created based on that time (step 517). If it is not correct (step 816), an error is manually entered into the response message (step 520), and a response message is created (step 517). Next, the response message transmitter 92 controls the response message (step 818).
). Thereafter, the time supply program again waits for the request message receiving section 80 to receive the request message.

When the time request program receives the response message (step S4), it checks whether the time has been successfully acquired and the reception has been completed (step S5), and if it is normal, the response message processing section 33 extracts the data. S6), the time calculation unit 50 calculates the time (step 37). Further, if an error message is received or there is no response within the time limit, an error message is output (step 510) and the program is terminated. Next, if the calculated time is correct (step S8), the time response unit 50
to return the time (step S9), processing end section 60
Terminates the process. If the calculation result is abnormal, the termination request section 34 issues a termination request, and the display section 35 outputs an error message to the console 36 (step 511).
),finish.

〔Effect of the invention〕

As explained above, the present invention uses one clock for all processes that require the current time.
This has the effect that all computers on the network can obtain the same time without having to make adjustments between computers.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a flowchart showing the processing procedure of the time request unit in FIG. 1. 10... Time request section, 20... Request reception section, 30.
...Message control section, 31..Request message transmission section, 32..Response message reception section, 33..Response message processing section, 34.. Termination request section, 35..
Display section, 36... Console, 40... Time calculation section, 50... Time response section, 60... Processing end section, 70
．． 71... Communication unit, 80... Request message receiving unit, 90... Message control unit, 91... Request message processing unit, 92... Response message transmitting unit, 93...
... Termination request section, 100... Time acquisition section, 110...
・Time generator.

Claims (1)

[Claims] 1. In a network time synchronization device included in a system including a plurality of computers that communicate with each other via a local area network, a first computer that is one of the computers has a time generation device. The second computer, which is a computer other than the first computer, includes request message sending means for sending a time request message to the first computer when a process requiring the current time occurs; The second computer includes a response message generation and transmission means for generating a response message including time data generated by the time generation device in response to an incoming time request message and transmitting the response message to the computer that has transmitted the time request message, the second computer comprising: A time calculation means that calculates the current time based on time data extracted from a response message that has arrived within a predetermined time after sending the request message, and a process that requires the current time when the response message has not arrived after the predetermined time has elapsed. A network time synchronization device characterized by comprising a process termination means for terminating the process.