JPH08272492A - Data processor - Google Patents

Abstract

PURPOSE: To shorten the time needed for the reoperation of a data processor by reconstructing a device control program with no intervention of an application program after a service interruption is recovered. CONSTITUTION: A file descriptor conversion table of a data processing body part 1 stores a file of device control programs loaded at a device control part 2 with correspondence secured between a file descriptor managed by an application program and a file descriptor managed by a device driver. If the system of the device driver is called by the application program after a service interruption is recovered, the file descriptor managed by the application program is converted into the file descriptor managed by the device driver based on the file descriptor conversion table. Then the system of the device driver is called with the converted file descriptor used as a parameter. In an error return mode, the file of device control programs is automatically opened with no intervention of the application program. Then the system of the device driver is called again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing device having a power failure recovery function such as a personal computer and a POS (point of sales) terminal, and more particularly to a CPU (central processing) as a device control unit.
unit: central processing unit) and a data processing unit using an intelligent printed circuit board mounted with a memory.

[0002]

2. Description of the Related Art For example, a control unit of a POS terminal used in a store or the like includes a CPU, a ROM (read only memory) and an R.
Communication controller for controlling data transmission / reception between the data processing main unit composed of AM (random access memory) etc. and the upper station connected to the line, keyboard controller for fetching key signals from the keyboard, display A display controller that controls the display operation of the printer and a device controller such as a printer controller that controls the printing operation of the printer are connected by a bus line.

Further, this POS terminal is generally equipped with an uninterruptible power supply device that automatically switches the power supply from a commercial power supply to an auxiliary power supply upon detection of a power failure, and during the power failure, the memory before the power failure is supplied by the power supply from the auxiliary power supply. The state of registers and registers can be maintained and processing can be continued from the state before the power failure when the power is restored. Such a function is called a power failure recovery function.

By the way, in a data processing device having a power failure recovery function in which a data processing main unit and a device control unit are connected by a bus line like the POS terminal, a CPU and a memory are mounted as a device control unit. The intelligent printed circuit board may be used. In the case of such a data processing device, the CPU of the data processing main unit, so-called main CPU, loads a predetermined device control program into the memory of the device control unit by executing the operating system when the power is turned on. Then, when the input / output of data is required by the execution of the application program, the application program performs a system call to the device driver incorporated in the operating system to control the corresponding device control unit to process the input / output of data. Was configured.

[0005]

However, since the device control unit composed of this intelligent type printed circuit board is only connected to the data processing main unit by a bus, it does not exist unless dedicated hardware is provided. The auxiliary power supply from the power failure power supply could not be received. Therefore, the data processing main unit initializes the device control unit and reloads the device control program into its memory just after the power is turned on, even immediately after the power failure is restored. Therefore, immediately after the power failure is restored, the file of the device control program is closed, and after the power failure is restored, an error is returned even if a system call is made to the device driver by the processing of the application program. At this time, most of the application programs instructed to open the file of the device control program after repeating the error retry several times, which caused a problem that it takes a long time to restart after the recovery from the power failure.

Therefore, according to the present invention, by executing an application program installed in a data processing main body section having an uninterruptible power supply, a device control section composed of an intelligent printed circuit board having a CPU and a memory is first operated after a power failure is restored. Access to the device, the file of the device control program loaded in the memory of the device control unit can be reconstructed without intervention of the application program, and data that can reduce the time required for restarting after a power failure is restored. It is intended to provide a processing device.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a CPU is provided in a data processing main unit having an operating system and an uninterruptible power supply for switching a power supply to a standby power supply when a power failure occurs and maintaining a state before a power failure. And a device control unit having a memory connected to the bus, and the data processing main unit initializes the device control unit each time the power is turned on and loads a predetermined device control program into the memory of the device control unit. In a data processing device that executes an application program to perform data processing, a data processing main unit includes a file descriptor for managing a file of a device control program by an application program and a device driver for the corresponding device control unit incorporated in an operating system. Corresponds with file descriptors managed by If there is a file descriptor conversion table that is stored in memory and a device driver system call is executed by the execution of the application program, the file descriptor managed by the application program, which is a parameter of this system call, is stored in the device based on the file descriptor conversion table. File descriptor conversion means for converting into a file descriptor under the control of the driver, and first system call means for making a system call to the device control program using the file descriptor under the control of the device driver obtained by the conversion means as a parameter. , Automatic file open means to open the device control program file when there is an error return to the system call by this means, and this means to open the device control program file. After, in which a second system call unit for system calls the device control program again.

[0008]

In the data processing apparatus of the present invention, after the power is turned on, the file descriptor conversion table provided in the data processing main body has the device loaded in the device control unit bus-connected to the data processing main body. The file of the control program is stored in correspondence with the file descriptor managed by the application program and the file descriptor managed by the device driver for the corresponding device control unit.

When a power failure occurs in this state, the power source of the data processing main unit is switched to the standby power source by the uninterruptible power supply unit and the state before the power failure is maintained. However, when the power failure is restored, the device control unit is initialized and a predetermined device control program is loaded into the memory of the device control unit, so the file of the device control program is closed.

Therefore, when a device driver system call is made by execution of an application program after recovery from a power failure, a file descriptor, which is a parameter of this system call, is a file under the device driver management based on the file descriptor conversion table. After conversion into a descriptor, the device control program is system called with this converted file descriptor as a parameter, but an error return is returned for this system call.

In the present invention, in response to this error return, after the file of the device control program is automatically opened without the intervention of the application program, the device control program is system called again. As a result, the device control program is executed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a LAN (local area n
A case where the present invention is applied to a POS terminal equipped with an uninterruptible power supply using an intelligent printer board as a control unit will be described.

FIG. 1 is a block diagram showing a main configuration of this embodiment. Reference numeral 1 is a data processing main body portion of a POS terminal, and 2 is a LAN control portion using an intelligent printer substrate.

The data processing main body 1 is connected to a main CPU 10 constituting the main body of the control unit via a processor bus 11.
ROM 12 in which fixed data such as programs are stored,
RAM 1 in which a program area for loading various programs and a data area for storing various data are formed
3, a direct memory access controller 14, a bus controller 15, a hard disk device controller 16 and the like are connected. Here, the hard disk device controller 16 is an HDD (hard disk) that writes and reads data to and from the hard disk.
disk driver (hard disk device) 17 is connected, and an operating system,
Application files, program files such as program libraries, etc. are registered.

Further, the data processing main body 1 outputs a power failure detection signal to the main CPU 10 when the power supply voltage of the commercial power supply drops to a predetermined power failure detection level, and switches the power supply to the standby power supply to the RAM 13 before the power failure. When the power supply voltage of the commercial power supply rises to a predetermined power failure recovery level after maintaining the state of the register, a UPS (uninterruptible power su) that outputs a power failure recovery detection signal to the main CPU 10 and switches the power supply from the standby power supply to the commercial power supply.
pply: uninterruptible power supply) 18.

The LAN control unit 2 connects the board CPU 20 for controlling LAN communication with the RO via the processor bus 21.
M22, RAM23, timer 24, S-IO (serial-i
mport outport) 25 etc. are connected. The processor bus 11 of the data processing main unit 1 and L
The processor bus 21 of the AN control unit 2 is connected via the dual port memory 3.

As shown in FIG. 2, the data processing main body 1 includes a LAN control unit 2 in a program area of the RAM 13.
A program library P2 including an operating system P1 in which a LAN driver P1a for controlling a power failure, a power failure detection driver P1b for executing a power failure detection process described later, and the like are incorporated, and a library P2a for performing a power failure recovery process described later.
And various application programs P3 are stored.

On the other hand, the LAN control unit 2 stores a LAN control program Q1 for executing LAN communication as a device control program in the program area of the RAM 23, as shown in FIG. This LAN control program Q1 is executed by the main CPU 10 when the data processing main unit 1 is started up by turning on the commercial power and when a power failure recovery detection signal is input from the UPS 18.
Is loaded into the program area via.

The data processing main body 1 is a RAM
In the 13 data areas, as shown in FIG.
A file descriptor for managing the file of the N control program Q1 by the application program P3 (hereinafter,
APL. fd: applicationfile dsecriptor) and a file descriptor managed by the LAN driver P1a (hereinafter referred to as DRV.fd: driver file dsecriptor) are stored in association with each other, and a file descriptor conversion table R1. An entry number memory R2 for storing the number N of data registered in the child conversion table R1 is formed.

In the file descriptor conversion table R1, when a task using the file specified by the corresponding file descriptor is in the active state, the task I
An area r1 for storing D, an area r2 for the first power outage counter c1, and an area r3 for the second power outage counter c2 are also formed.

FIG. 5 is a flow chart showing a power failure detection process controlled by the power failure detection driver P1b. This process is started in response to a power failure recovery signal input from the UPS 18. That is, when the main CPU 10 receives the power failure recovery signal from the UPS 18, the main CPU 10 sequentially checks the data registered in the file descriptor conversion table R1, and checks the task I
When D detects the stored data, a power failure has occurred while the task specified by the file descriptor of that data is in the active state, so the first power failure counter c1 for that data is incremented by "+1". .

Thus, the file descriptor conversion table R for the number of data N stored in the entry number memory R2
When the data registered in No. 1 is checked, the LAN control unit 2 is initialized, then a predetermined LAN control program Q1 is loaded into the RAM 23 of the LAN control unit 2, and this process is terminated.

FIG. 6 is a flow chart showing a power failure recovery process executed by the power failure recovery library P2a, which is executed by executing the application program P3.
It starts when there is a system call for the AN driver P1a.
That is, when the system call of the LAN driver P1a from the application program P3 is input, the main CPU 11 sequentially checks the data registered in the file descriptor conversion table R1 and APL, fd is the file descriptor of the system call. Search for data that matches.

Then, if APL, fd can detect data matching the file descriptor which is a parameter of the system call (hereinafter referred to as descriptor matching data),
The file descriptor is the DRV. fd (file descriptor conversion means), and the DRV. A system call is made to the LAN driver P1a using fd as a parameter (first system call means).

As a result, when the LAN driver P1a returns a system return indicating the normal execution completion, the file descriptor is set to the APL. After inverse conversion to fd, this APL. Using fd as a parameter, the application program P3 is returned to the system indicating normal completion, and the process is terminated.

On the other hand, when an error return is returned from the LAN driver P1a as a result of the system call to the LAN driver P1a, the first power failure counter C1 and the second power failure counter C2 of the descriptor matching data are compared. . If the two counters C1 and C2 do not match, it is an error caused by the occurrence of a power failure, and therefore the second descriptor matching data
The power failure counter C2 of 1 is matched with the first power failure counter C1 and registered in the file descriptor conversion table R1.

Further, the LAN driver P1a is connected to the LAN
If the command to open the control program file is issued (automatic file opening means), the descriptor matching data DRV. A system call is again made to the LAN driver P1a using fd as a parameter (second system call means).

As a result, the LAN driver P1a returns a system return indicating normal completion of execution, so that the file descriptor is the APL. After inverse conversion to fd, this APL. Using fd as a parameter, the application program P3 is returned to the system indicating normal completion, and the process is terminated.

As a result of the system call to the LAN driver P1a, an error return is returned from the LAN driver P1a, but the first power failure counter C of the descriptor matching data is returned.
When 1 and the second power failure counter C2 match,
Since an error occurred due to a cause other than power failure, set the file descriptor to APL. After inverse conversion to fd, this APL. An error is returned to the application program P3 using fd as a parameter, and this processing ends.

Further, as a result of searching all registered data in the file descriptor conversion table R1 by a system call from the application program P3, when the data whose parameter file descriptor and APL, fd match can not be detected. Returns an error to the application program P3 using the file descriptor which is a parameter of the system call as a parameter,
This process ends.

In this embodiment having such a configuration, a power failure occurs in the commercial power source and the UPS 18 causes the main C
When a power failure detection signal is input to PU10, main CPU1
By 0, the program address in the CPU, the value of the register, etc. are saved in the RAM 13. In addition, UPS18
The auxiliary power is supplied from the RAM 13 to the RAM 13, and the data on the RAM 13 is stably stored and held. However, since the auxiliary power is not supplied to the RAM 23 of the LAN control unit 2, the data is lost due to the occurrence of the power failure.

After that, the power failure of the commercial power source is restored and UPS
When a power failure recovery signal is input to the main CPU 10 from 18, the power failure detection driver P2b is activated and the power failure detection process shown in FIG. 5 is executed. That is, the task of the LAN control program Q1 that was in the active state before the power failure occurred is searched for. And the LAN used for that task
A file descriptor APL. Which designates a control program file. fd and DRV. The first power failure detection counter C1 corresponding to fd is incremented. In addition, after the LAN controller 2 is initialized in the same manner as when the power is normally turned on,
A predetermined LAN control program Q1 is loaded into the RAM 23.

On the other hand, in the data processing main unit 1, R
The data saved in the AM 13 is the main CPU 10
Then, the application program P3 is continued from the state before the power failure occurred. When the LAN communication processing timing is reached by the execution of this application program P3 and the system call of the LAN driver P1a is made, the power failure recovery library P2a is activated and the FIG.
The power failure recovery process shown in is started. That is, from the file descriptor conversion table R1, descriptor matching data in which APL and fd match the file descriptor which is a parameter of the system call is detected. Then, the DRV. The LAN driver P1a is system called using fd as a parameter.

However, at this time, since it is the first system call after the recovery from the power failure and the file of the LAN control program Q1 is not opened, the LAN driver P
1a returns an error return to the power failure recovery library P2a. As a result, the first descriptor matching data
The power outage counter C1 and the second power outage counter C2 are compared, and since they do not match, it is determined that the error is caused by the occurrence of a power outage, both power outage counters C1 and C2 are matched, and the LAN control program Q1 File open command is issued.

As a result, the LAN control program Q1
File is opened, the descriptor matching data DRV. The LAN driver Pa1 is system called with fd as a parameter. As a result, the LAN control unit 2 is controlled to process the LAN communication by executing the application program P3.

Thus, according to this embodiment, UPS1
A POS in which a LAN control unit 2 as a device control unit configured by an intelligent printed circuit board on which a board CPU 21, a RAM 23 and the like are mounted is connected to a data processing main unit 1 having a power failure recovery function by mounting 8
In the terminal, when the LAN control unit 2 is first accessed by the continuation processing of the application program P3 after the power failure recovery, the R of the LAN control unit 2 is restored at the time of the power failure recovery without intervention of the processing of the application program P3.
Device control program Q1 loaded in AM23
Since the LAN driver P1a can make a system call after opening the file, the application program P3 repeats error retries several times, and then after the file opening of the LAN control program Q1 is commanded, a power failure recovery This has the effect of reducing the time required for subsequent re-operation.

Further, according to this embodiment, it is possible to omit the processing related to the power failure recovery from the application program P3. That is, by incorporating the power failure detection driver P1b and the power failure recovery library P2a in the present embodiment into the data processing main unit 10, even an application program having no power failure recovery processing function can be used, and versatility can be improved. There is an effect that can be done.

Although the LAN control unit 2 for controlling the LAN communication is shown as the device control unit having the CPU and the memory mounted in the above embodiment, the data processing apparatus equipped with the device control unit for controlling the other devices is shown. However, it goes without saying that the present invention can be applied.

[0039]

As described in detail above, according to the present invention, an intelligent printed circuit board in which a CPU and a memory are mounted by executing an application program installed in a data processing main unit having an uninterruptible power supply is constructed. When the device control unit is accessed for the first time after a power failure recovery, the file of the device control program loaded in the memory of the device control unit can be reconstructed without intervention of the application program, and it can be restarted after a power failure recovery. It is possible to provide a data processing device that can improve the versatility by shortening the time required for, and by simplifying the application program.

[Brief description of drawings]

FIG. 1 is a block diagram of an essential part of an embodiment of the present invention.

FIG. 2 is a RAM of a data processing main unit according to the embodiment.
Diagram of the program loaded into.

FIG. 3 is a structural diagram of a program loaded in a RAM of a LAN control unit in the embodiment.

FIG. 4 is a RAM of a data processing main unit according to the embodiment.
The figure which shows the main memory area formed in.

FIG. 5 is a flowchart showing a power failure detection process executed by the main CPU of the data processing main body unit according to the embodiment.

FIG. 6 is a flowchart showing a power failure recovery process executed by the CPU.

[Explanation of Codes] 1 ... Data processing main unit 2 ... LAN control unit (device control unit) 3 ... Dual port memory 10 ... Main CPU 18 ... UPS (Uninterruptible power supply) P1 ... Operating system P1a ... LAN driver (device driver) ) P1b ... Power failure detection driver P2a ... Power failure recovery library P2 ... Program library P3 ... Application program Q1 ... LAN control program (device control program) R1 ... File descriptor conversion table

Claims (1)

[Claims] 1. A device in which a CPU and a memory are mounted in a data processing main unit having an operating system and an uninterruptible power supply unit that switches a power supply to a standby power supply when a power failure occurs and maintains a state before a power failure. The control unit is connected to the bus, and the data processing main unit initializes the device control unit each time the power is turned on, loads a predetermined device control program into the memory of the device control unit, and then executes the application program. In the data processing device for performing data processing by means of the data processing device, the data processing main unit is a file descriptor for managing a file of the device control program by the application program and a device driver for the corresponding device control unit incorporated in the operating system. Manage file descriptors and If there is a system call of the device driver due to the execution of the application program and a file descriptor conversion table stored correspondingly, a file descriptor under the control of the application program, which is a parameter of this system call, is converted into the file descriptor conversion table. File descriptor conversion means for converting into a file descriptor under the control of the device driver based on a table, and a system call for the device control program using the file descriptor under the control of the device driver obtained by the conversion means as a parameter First system call means, an automatic file opening means for opening the file of the device control program when an error is returned in response to the system call by this means, and the device by the means. A data processing device comprising: a second system call means for re-system-calling the device control program after opening a chair control program file.