JPH04297941A - Micro-main frame link control method - Google Patents

Abstract

PURPOSE:To obtain the micro-main frame link control method which can easily perform access to files on plural hosts without lowering memory efficiency. CONSTITUTION:In this micro-main frame link control method access from a microcomputer 7 to the file in a main frame and according to the instruction of a user program 3, it is instructed to transmit a packet control table 4 describing the structure of a transmitting/receiving packet to be exchanged with a host computer 5 and the timing of transmission /reception from the microcomputer 7 to the host computer 5 of the main frame. Then, the microcomputer 7 is equipped with a communication connecting means to load down the packet control table 4 and an analysis executing means to analyze the packet control table 4 corresponding to the request of a micro-main frame link function from the user program 3, and the contents of the packet control table 4 in the microcomputer 7 are changed corresponding to the main frame.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microcomputer control method for a micro mainframe link (hereinafter referred to as MML), which accesses files existing in a mainframe from a microcomputer.

0002

2. Description of the Related Art In conventional MML control, a control program describes what kind of packet to create, transmit, receive, or decompose for each request code. In response to this, in the previously filed Japanese Patent Application No. 3-9924, the present applicant provided a packet control table that described the structure of the packet for each request code, and the control program interpreted and executed the contents of this packet control table. We have proposed a method for realizing MML control by creating packets using

An example of the configuration of the MML control program proposed above is shown in FIG. In Figure 4, 1 is an operating system (OS) that exchanges packets with the communication line;
' is an MML control program for managing MML functions,
3 is a user program as an application program that uses the MML function, and 4' is an MML control program 2' that assembles an MML packet and transmits it, receives the MML packet from the mainframe, and sends the data of the packet. This is a packet control table that controls passing to the user program.

FIG. 5 shows an example of the structure of the packet control table 4', and 4-1 is a packet control index, which is an array of pointers with request codes as indexes. In this example, the first index is the pointer 1 to the open packet control information 4-2, and the second index is the pointer 1 to the open packet control information 4-2.
A pointer 2 to the read packet control information 4-3 is stored in the index, and a pointer 3 to the close packet control information 4-4 is stored in the third index. Packet control information 4-2 to 4-4 are character strings of 1 byte each corresponding to the request code, and are interpreted and executed from left to right according to the format and values shown in Figure 6. , the MML control program 2' plays the role of an interpreter that performs this interpretation and execution. In addition, packet control information 4-2 in FIG.
The character strings 4-4 are the results of translating the program in the packet control language shown in FIG. 7 according to the format and values shown in FIG.

Next, the operation of the MML control program 2' will be explained using FIG. In FIG. 9, which is an example of the user program section 3-2, each process P1, P2, P3, and P4 calls the MML interface library section 3-1. The process P1 indicates that the file A is opened for reading only (RO), and the program portion of the process P1 calls the open routine of the MML interface library unit 3-1 shown in FIG.

The open routine in FIG. 10 includes a parameter setting part P11, a calling part P12 of the MML control program 2, and a part P13 returning to the user program part 3-2.
It consists of Therefore, by executing process P1 in FIG. 9, P11 and P12 in FIG. 10 are executed, and M
Control is transferred to the ML control program 2'. Here, Figure 10
The MML after the parameter values are prepared by P11 and the MML control program 2' is started by P12.
The operation of the control program 2' will be explained using the program of the MML control program 2' in FIG. 8 and FIG. 6.

[0007] The MML control program 2' includes step S
1, the request code set by P11 in Figure 10 is d
Received from 0, request code value is “1” (open)
Recognize that. Packet control index 4-
1 array, obtain a pointer to the open packet control information 4-2 using the request code "1" as an index, and use it as the packet control information pointer (skptr).
Set to . Next, in step S90, the 1-byte area pointed to by the packet control information pointer (skptr) is checked, and since its value is "1", the process proceeds to step S11 based on the determination in step S10.

[0008] In step S11, the transmission packet pointer (
sptr) at the beginning of the transmission packet buffer (sbuf), and in step S12, "m" (100 in this example) shown in FIG. 6 is stored in the transmission packet buffer, and the transmission packet pointer (sptr) should be stored next. In step S13, the packet control information pointer (sk
Add 2 to ptr). As a result, the packet control information pointer (skptr)
will point to the packet control information to be operated on next. Here, the packet control information pointer (sk
ptr) points to the third information "2" in the open packet control information 4-2.

Next, control returns to step S90.
Since the first byte pointed to by the packet control information pointer (skptr) is "2", steps S10 and S2
Proceed to S21 from 0. In step S21, data corresponding to the length of l1 shown in FIG. 6, that is, 32 bytes in length here, is transferred from the area whose address is d1 to the area pointed to by the transmission packet pointer (sptr), and step S22 and set the send packet pointer (sptr) to 3.
2 is added, the parameter count is counted up, and the next parameter is stored in d2. In step S23, the packet control information pointer (skp
tr) to prepare for the next operation. That is, the packet control information pointer (skptr) points to the fifth information "5" in the open packet control information 4-2.

Next, as described above, the 1 byte pointed to by the packet control information pointer (skptr) has the value "5".
” Therefore, steps S90, S10, S20, S30,
The process advances from S40 and S50 to S51. Here, the open transmission packet shown in FIG. 11 is created in the transmission packet buffer (sbuf). In step S51, a transmission request is made to the OS to transmit the transmission packet buffer (sbuf) to the main frame, and at the end of transmission, the packet control information pointer (skp
tr) to prepare for the next operation request. Here, the packet control information pointer (skptr)
is the sixth " in the open packet control information 4-2.
It points to 6”.

Next, the packet control information pointer (skp
Since the first byte of tr) has the value “6”, step S
90, S10, S20, S30, S40, S50, and since the judgment in step S50 is No, step S6 is executed.
Go to 1. In step S61, the main frame waits for a response and transfers the response packet to the reception packet buffer (r
sends a request to the OS to copy it to When the reception is completed, the contents of the receive packet buffer (rbut) become the open receive packet 21 in FIG. 11, and the receive packet pointer (rptr) is set in step S62.
) at the beginning of the received packet buffer (rbut), and in step S63 the packet control information pointer (skp
tr) to prepare for the next operation. Here, the packet control information pointer (skptr) points to the seventh "3" in the open packet control information 4-2.

Next, the packet control information pointer (skp
Since the first byte of tr) has the value “3”, step S
The process proceeds from 90, S10, S20, and S30 to S31. In step S31, the length l2 shown in FIG. 6 from the area pointed to by rptr, here a length of 2 bytes, is set to d0. In step S32, this value 2 is set in rptr.
is added, and the received packet pointer (rptr) is updated to the next point to be read. In step S33,
2 is added to the packet control information pointer (skptr) to prepare for the next operation. Here, the packet control information pointer (skptr) points to the ninth "9" in the open packet control information 4-2.

Next, the packet control information pointer (skp
The value of the 1 byte pointed to by tr) is “9”, so
Since the determination in step S90 is Yes, MM
After the execution of the L control program 2 is completed, control is transferred to the MML interface library section 3-1, and eventually returns to the user program section 3-2, and the execution of the process P1 in FIG. 9 is ended.

For processes P2 and P4 in FIG. 9, the read packet control information 4-3 and
Alternatively, the MML control program 2' executes and interprets the closing control packet 4-4, transmits the read transmission packet 12 or the closing transmission packet 13 shown in FIG. 11 to the main frame, and also transmits the read reception packet 22, respectively. , or the close reception packet 23 is received from the main frame, and the necessary data is returned to the user program.

[0015]

However, in the conventional example described above, the packet control table resides on the microcomputer together with the MML control program, so there are the following drawbacks. (1) When you finish exchanging data using MML with the host you are currently communicating with and wish to exchange data using MML with another host, erase the MML control program from memory and delete the packets for MML with the other host. Must be reloaded along with the control table (because different hosts have different protocols). (2) When exchanging arbitrary data with a plurality of hosts through the MML function, all expected packet control tables must be resident on the microcomputer, resulting in poor memory efficiency.

The present invention provides a micro mainframe link control method that eliminates the above-mentioned conventional drawbacks and allows files on multiple hosts to be easily accessed without reducing memory efficiency.

[0017]

[Means for Solving the Problem] In order to solve this problem, the micro mainframe link control method of the present invention provides a micro mainframe link control method for accessing files in the mainframe from a microcomputer.
The link control method includes transmitting, from the microcomputer to the mainframe host computer, a packet control table that describes the structure and timing of sending and receiving packets to be exchanged with the host computer, according to instructions from a user program. The microcomputer includes a communication connection means for downloading the packet control table, and an interpreter for interpreting the packet control table in response to a request from the micro mainframe link function from the user program. means for changing the contents of the packet control table of the microcomputer in accordance with the mainframe.

According to the present invention, files on a plurality of hosts can be easily accessed by providing a function of dynamically loading an MML packet control table in response to a request from a user program.

[0019]

Embodiment FIG. 1 shows the structure of the MML control program of this embodiment. In FIG. 1, the difference from FIG. 4 showing a conventional configuration example is the MML control program 2.
The MML control program 2' in FIG. 4 functionally corresponds to the interpretation execution unit 2-1 in FIG.
is a function added in this embodiment.

In FIG. 1, 1 is an operating system (OS) that exchanges packets with a communication line, and 2 is an MML.
It is an MML control program for managing functions, and 2-
1 is an interpretation execution unit that interprets and executes the packet control table 4; 2-2 requests the host to transmit the packet control table 4 in accordance with a host connection request from the user, and downloads the packet control table 4 from the host. It is a communication connection part. 3 is a user program as an application program that uses the MML function; 4 is a packet control table downloaded from the host by the communication connection unit 2-2; the MML control program 2 assembles and transmits MML packets, and This table controls the reception of packets and the delivery of the data in the packets to the user.

5 is a host computer that exchanges packets through the communication line 6, and 5-1 is a packet that transmits the packet control table 5-2 in the host computer 5 in response to a download request from the communication connection section 2-2. This is a control table transmitter. 5-2 is a packet control table which is transmitted from the packet control table transmitting section 5-1 to the microcomputer 7, and the result downloaded by the communication connection section 2-2 becomes the packet control table 4. Reference numeral 7 indicates a microcomputer, which includes the OS 1, an MML control program 2, a user program 3, and a packet control table 4.

Next, the operation of the MML control program 2 with the above configuration will be described. First, the user program section 3-2 in the user program 3 issues a connection request to the host computer 5. This connection request is made by calling the connection subroutine of the MML interface library section 3-1 along with the host name. The connection subroutine of the MML interface library section 3-1 calls the communication connection section 2-2 using means such as an interrupt.

FIG. 2 shows the program of the communication connection section 2-2. In FIG. 2, the communication connection section 2-2 in the MML control program 2 acquires a host name from the MML interface library section 3-1 in step S1, and connects to the host specified by the host name. In step S2, the packet control table transmitter 5- in the host computer 5
1 and requests it to transmit the packet control table 5-2 in the host computer 5. In response to the request, the packet control table transmitter 5-1 transmits the packet control table 5-2 through the communication line 6. In step S3, the communication connection unit 2-2 receives the packet control table 5-2 sent through the communication line 6, and
It is stored in memory as a packet control table 4. In step S4, the communication connection section 2-2 communicates the address in the memory of the packet control table 4 to the interpretation execution section 2-1.

In this way, once the host computer 5 is connected and the packet control table 4 is stored, the interpretation execution section 2-1 can realize the MML function by performing the same operations as in the conventional example. can. That is,
The interpretation execution unit 2-1 is the MML control program 2' in FIG.
The address of the packet control table 4 in FIG. 1 is fixed like the address of the packet control table 4' in FIG. 4 (when the MML control program 2' in FIG. It is not a fixed address, but it is the address downloaded by the communication connection unit 2-2 in FIG. 1 and stored in the memory of the microcomputer 7, and is not fixed. It's different.

The program of the interpretation execution unit 2-1 is as shown in FIG. 3, which is the conventional program shown in FIG.
Just added 0. After the interpretation execution section 2-1 first obtains the address of the packet control table 4 obtained from the communication connection section 2-2 in step S0, it uses the conventional example shown in FIG.
7 and 9 to 11 can be applied to the program in FIG. 3, so the details will not be repeated.

By using the method described above, any host computer specified by the user program and M
Communication using the ML function can now be performed, eliminating the need to reload the MML control program together with the packet control table as in the conventional system, and allowing the user program to specify any host on the program.

[0027]

[Other Embodiments] FIG. 12 shows another embodiment of the present invention. There are no changes from FIG. 1 except that the packet control table 4 consists of a packet control table 4-1 and a packet control table 4-2, and the number of host computers 8 has been increased.

In FIG. 12, packet control table 4
-1 is a packet control table 5-2 of the host computer 5 downloaded and stored in memory by the communication connection unit 2-2; This is the downloaded packet control table 8-2.

The operation of the MML control program 2 in FIG. 12 is the same as the MML control flow in FIG. 1, so a description thereof will be omitted. In FIG. 12, the operation of the user program when requesting connection with the host computer 5 at a certain point is as shown in FIG.
This can be explained by replacing the host computer 5 and packet control table 4 of FIG. 12 with the host computer 5 and packet control table 4-1 of FIG. 12, respectively. In addition, in FIG. 12, the operation when requesting connection with the host computer 8 at other points in the user program is as follows: The host computer 5 and packet control table 4 in FIG. This can be explained by replacing it with -2.

[0030] According to the above embodiment, it is possible to simultaneously communicate with a plurality of host computers using the MML function, and the versatility is increased compared to the conventional system. In the conventional method,
Instead of making a connection request with the host computer in the program, it always has a packet control table for host computers 5 and 8. For example, if a user program attempts to communicate with host computers 5 and 8 at the same time, Then, 2
A packet control table for the host computer must be resident in memory, and MML
The control program will be restarted on the microcomputer.

Another embodiment will be shown using FIG. 12. This embodiment shows an example in which the packet control table 4-1 and the packet control table 4-2 do not exist in the memory of the microcomputer 7 at the same time. This is Figure 12
Medium, disconnect to communication connection section 2-2
This program can be realized by providing the following functions, and this program is shown in Figure 1.
Shown in 3.

[0032] The user program unit 3-2 uses the MML interface library unit 3-1 to request disconnection.
Call the subroutine inside. This subroutine uses an interrupt or the like to call the disconnection routine of the communication connection section 2-2. In FIG. 13, the packet control table corresponding to the host computer to be disconnected is deleted from the memory in step S5, and communication with the host computer is disconnected in step S6. In step S7, the interpretation execution unit 2-1 is informed that the packet control table cannot be used from now on.

When the user program 3 performs the series of operations shown in FIG. 14, the microcomputer 7 only needs to have one packet control table at a time. In this way, although a user program does not communicate with multiple host computers at the same time using the MML function, when one user program accesses files on multiple host computers, packets are sent to all host computers as in the conventional method. Since there is no need to have a control table, memory can be used effectively.

[0034]

According to the present invention, it is possible to provide a micro mainframe link control method that allows files on multiple hosts to be easily accessed without reducing memory efficiency.

In other words, a program using the MML function can specify any host on the program. MML that can communicate with multiple host computers simultaneously
Since it is necessary to store only the packet control table for the host computer that is communicating at the same time in the memory, memory is saved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a configuration example of an MML control program implementing the present invention.

FIG. 2 is a diagram showing processing of a communication connection section in the MML control program of FIG. 1;

FIG. 3 is a diagram showing processing of an interpretation execution unit in the MML control program of FIG. 1;

FIG. 4 is a diagram showing a configuration example of a conventional MML control program.

FIG. 5 is a diagram showing an example of the configuration of a packet control table in FIGS. 1 and 4;

FIG. 6 is a diagram showing the format, meaning, and operation of the packet control information in FIG. 5;

FIG. 7 is a diagram showing the packet control information of FIG. 5 in high-level language.

FIG. 8 is a diagram showing processing of a conventional MML control program.

FIG. 9 is a diagram showing an example of a user program section in FIGS. 1 and 4. FIG.

FIG. 10 is a diagram showing an example of an open routine in the MML interface library in FIGS. 1 and 4;

FIG. 11 is a diagram showing an example of MML packets totally received by the MML control program in FIGS. 1 and 4;

FIG. 12 is a diagram showing a configuration example of an MML control program according to another embodiment of the present invention.

FIG. 13 is a diagram illustrating processing of a communication connection unit disconnection routine in another embodiment.

FIG. 14 is a diagram showing the movement of a user program in another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Operating system (OS), 2... MML control program, 2-1... Interpretation execution section, 2-2... Communication connection section, 3... User program, 3-1... MML interface library section, 3-2... User program section, 4...
Packet control table, 4-1...Packet control table, 4-2...Packet control table, 5...Host computer, 5-1...Packet control table transmitter, 5-2...
Packet control table, 6...Communication line, 7...Microcomputer, 8...Host computer, 8-1...Packet control table transmitter, 8-2...Packet control table

Claims (1)

[Claims] 1. A micro-mainframe link control method for accessing files in a mainframe from a microcomputer, the method comprising: accessing files from the microcomputer to a host computer of the mainframe according to instructions from a user program; The microcomputer issues an instruction to send a packet control table that describes the structure and timing of sending and receiving packets to be exchanged with the host computer, and the microcomputer has a communication connection means for downloading the packet control table, and a microprocessor from the user program. - Interpretation execution means for interpreting and executing the packet control table in response to a request of the mainframe link function, and changing the contents of the packet control table of the microcomputer in accordance with the mainframe. micro mainframe link control method.