JPH09305254A - Timer device for computer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct system time while maintaining the consistency of a time series of data at the correction time. SOLUTION: This timer device for the computer holds the correction time difference between system time before correction that a timer part is clocking and correction time inputted from a correction time input part in a difference time storage part (S15) when the system time that the timer part of the computer is clocking is corrected by being traced back to the past. Then a time correction control part waits for the system time before correction clocked by the timer part to reach time after the time obtained by adding the correction time difference to the final answer time held in a final answer time storage part (S16) and sets the time obtained by subtracting the said correction time difference from the current system time as new system time in the timer part (S17).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timing device for a computer.

[0002]

2. Description of the Related Art A conventional timekeeping device for a computer is designed to immediately adjust the time to a specified time when a correction command is given when attempting to correct the time.

[0003]

However, in such a conventional computer clocking apparatus, the system time is advanced, so when the correction is made retroactively to correct the advance, the computer side The final response time of the application program or I / O device that was executed after the system time was corrected is returned to the time before the final response time of the application program or I / O device that was executed up to that point. There is a problem that the time becomes earlier (past) than the time, and in particular, when data is managed in time series, a reverse phenomenon occurs in time series.

The present invention has been made in view of such conventional problems. When the system time is corrected, the time inversion phenomenon does not occur in time series even if the system time is corrected retroactively. It is an object of the present invention to provide a computer clock device as described above.

[0005]

According to another aspect of the present invention, there is provided a computer clocking device comprising: a clocking unit for clocking a system time; and a final response time storing unit for holding a final response time to an application program or an input / output device. A correction time input unit for inputting a correction time of the system time measured by the time measuring unit, and a system time before correction and the system time measured by the time measuring unit when the correction time is input by the correction time input unit. When the correction time input from the correction time input unit is a difference time storage unit that holds a correction time difference with respect to the correction time input from the correction time input unit, and the correction time input from the correction time input unit is a time backward from the system time, The clock unit counts the time until the system time before correction measured by the unit becomes a time after the time obtained by adding the correction time difference to the final response time. From the stem time by subtracting said correction time difference is obtained and a time correction control unit to be set in the time measuring unit as a new system time.

In the computer clock device according to the first aspect of the present invention, when the system time to be clocked by the clock unit of the computer is corrected, if the time to be corrected goes back in the past, the clock unit corrects the time. The correction time difference between the previous system time and the correction time input from the correction time input unit is held in the difference time storage unit. Then, the time adjustment control unit waits until the system time before correction measured by the timekeeping unit becomes the time after the time obtained by adding the correction time difference to the final response time stored in the final response time storage unit,
The correction is made by subtracting the correction time difference from the current system time and setting it as a new system time in the timekeeping section.

This prevents the occurrence of the reversal phenomenon of the data time series even if the system time is corrected to be traced back in the past, especially when it is necessary to manage the data in time series based on the system time. Therefore, the consistency of the time series data can be always maintained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a functional block diagram of one embodiment of the present invention, and FIG. 2 is a flowchart of the processing procedure of the system time correction function. The computer clocking device of the present invention is actually realized by a program of a system clocking function incorporated in a computer. Here, the functional configuration of one embodiment is based on the block diagram of FIG. explain. The computer 1 has a timekeeping interface unit 2 for interfacing with application programs and input / output devices, a timekeeping unit 3 for measuring system time, and a final response for storing the final response of the application program and the input / output device received by the timekeeping interface unit 2. Time storage unit 4,
A difference time storage unit 5 for storing a time difference between the time before correction and the time to be corrected when the system time is corrected,
The system includes a clock device control unit 6 that transfers the system time measured by the clock unit 3 to an application program or an input / output device through the clock interface unit 2 and corrects the system time.

Next, the operation of the computer clock device having the above configuration will be described. The normal timing operation is shown in the flowchart of FIG. When the timekeeping interface unit 2 receives a current time request command from an application program or an input / output device (step S1), the timekeeping device control unit 6 reads out the system time kept by the timekeeping unit 3 and transfers it to the timekeeping interface unit 2. (Step S2). At the same time, the timer control unit 6 updates and holds the current time passed to the final response time storage unit 4 as the final response time (step S3). Then, the clock interface unit 2 responds with the current system time to the application program or the input / output device (step S4).

Next, it is necessary to correct the system time of the clock unit 3, and the operation of each unit when the correction process is performed will be described with reference to the flowchart of FIG. When the timekeeping interface unit 2 receives a system time correction request command from the input / output device (step S11), the timekeeping device control unit 6 receives the correction command and corrects the current system time τsys measured by the timekeeping unit 3. When the system time τsys is delayed compared to the time τad (that is, when the time τad to be corrected is advanced: τad ≧ τsys) and when the system time τsys is advanced (therefore, If the time τad to be corrected goes back in the past: τad <τsys) (step S12).

When the system time τsys is delayed and the correction is made to proceed, there is no possibility that the time-reversal phenomenon of the time series data will occur.
Let ad be the system time τ sys as it is (step S1
3) Further, the difference time Δτ between the system time τsys and the time τad to be corrected is added to the final response time τlast stored in the final response time storage unit 4 to obtain a new final response time τlast (= τad + Δτ. ) Is stored as an update (step S14).

However, when the system time τsys is advanced and an attempt is made to correct it by delaying it, there is a risk of inconsistency in the time series of the data, so first the difference Δτ between the system time τsys and the correction time τad is calculated. The difference is calculated and stored in the difference time storage unit 5 (step S15).

Then, the system time τsys waits for the correction time difference Δτ to elapse from the final response time τlast stored in the final response storage unit 4 (step S16).
System time τsys that the timekeeping unit 3 is measuring at that time
The correction time difference Δτ is subtracted from the (time before correction) to obtain a new system time τsys, which is set in the clock unit 3 (step S17).

The above-mentioned operation of correcting the system time will be described more specifically with reference to the explanatory view of FIG. The timekeeping interface unit 2 receives the time response request commands (a) and (b) on the basis of the system time before correction, and the system time before correction "12:01:00" is 12: 01'00 ". (= Τ sys) → 12: 00'00 ”
It is assumed that a time correction request that goes back by “1 minute” (= Δτ) is accepted in the past with (= τad). Furthermore, it is assumed that after that, the time response request commands (c) and (d) are respectively accepted.

The time correction processing operation in such a case is as follows. When the response request commands (a) and (b) are received, the correction request has not been received yet, so the system time is set to "11".
"58: 30.00 seconds", "12: 00: 40.00
Seconds "are sequentially stored in the final response time storage unit 4 (OP1
~ OP4).

Thereafter, the system time "12:01:00.
When the correction request (a) for delaying the time by "1 minute" is received at "00 seconds" (OP5), the timekeeping device control unit 6 obtains a correction time difference Δτ = 1 minute between the current system time and the correction time, and Is stored in the differential time storage unit 5.

At this time, the final response time (b) held in the final response time storage unit 4 is "12:00:40.
Seconds "," 12:00:40 "-" 12:00:40 "<correction time difference" 1 minute ", and if corrected immediately, between the time for the time response request command that occurs immediately after that. Since the inversion phenomenon occurs at, the system time-final response time (b)> correction time difference "1" without immediately correcting the time.
Wait until "minute" (OP6).

However, if the time response request command (c) is further accepted during this waiting time, the response times are also sequentially stored in the final response time storage unit 4 based on the system time before correction. Go (OP
6, OP7).

After that, the time response request command does not arrive for a while, and the final response time (c) = “12”.
When the correction time difference "1 minute" has elapsed from "hour 1 minute 20.00 seconds", that is, the system time "12: 2: 20.0"
When it becomes 1 second, the system time is changed to the system time before correction "12: 2: 20.01 seconds" -correction time difference "1 minute" = system time after correction "12:01"
Minute 20.01 seconds "and set in the timer section 3.

A time response request (d) of "12: 2: 30" based on the system time before correction, which occurred after this correction (d)
Will be managed on the basis of the corrected system time, and will be stored in the final response storage unit 4 as "12: 1: 30" on the basis of the corrected system time (OP8, OP
9).

In this way, when the system time is adjusted, the system time is advanced, so when the time is adjusted by delaying it and going back in the past, the current system time is corrected to make the final adjustment. By performing the correction processing after waiting for a time that does not come before the response time, inconsistency does not occur in the time series data stored in the final response time storage unit, and the time series data Maintain integrity.

[0022]

As described above, according to the invention of claim 1,
When correcting the system time measured by the timekeeping part of the computer, if the time to be corrected goes back in the past, the difference in correction time between the system time before correction and the specified correction time is stored in the difference time storage part. Hold it, wait until the system time before correction is equal to or later than the time when the correction time difference is added to the final response time of the system stored in the final response time storage section, and then correct the current system time. Since the new system time is subtracted from the time difference and this is set in the timekeeping part, the system time can be traced back to the past especially when it is necessary to manage the time series based on the system time. Even if corrected, it is possible to prevent the inversion phenomenon of the data time series from occurring,
It is possible to always maintain the consistency of time series data.

[Brief description of drawings]

FIG. 1 is a functional block diagram of one embodiment of the present invention.

FIG. 2 is a flowchart of a time response process in the above embodiment.

FIG. 3 is a flowchart of time correction processing according to the above embodiment.

FIG. 4 is an explanatory diagram of a time adjustment process in the above embodiment.

[Explanation of symbols]

 1 computer 2 timing interface unit 3 timing unit 4 final response time storage unit 5 differential time storage unit 6 timing device control unit

Claims (1)

[Claims] 1. A timekeeping unit for measuring a system time, a final response time storage unit for holding a final response time to an application program or an input / output device, and a correction for inputting a corrected time of the system time measured by the timekeeping unit. A time input section, and when the correction time is input by the correction time input section,
A difference time storage unit that holds a correction time difference between the system time before correction timed by the timekeeping unit and the correction time input from the correction time input unit, and the correction time input from the correction time input unit Is a time that goes back in the past from the system time, waits for the system time before correction measured by the timekeeping unit to be a time after the time obtained by adding the correction time difference to the final response time, and then measuring the time. A timekeeping device for a computer, comprising: a time adjustment control unit that subtracts the correction time difference from the system time measured by the unit and sets it as the new system time in the timekeeping unit.