JPH0650874B2 - Data transmission schedule system for terminals - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a plurality of terminal control devices connected to an information processing device via a line, and transmits data from the information processing device to terminals under the control of the terminal control device. The present invention relates to a data transmission schedule method for transmission.

[Prior Art] In a data communication system such as an electronic mail system, a dedicated line, a switching line, a subscriber line of a packet switching network or a circuit switching network, a LAN (Local A
A plurality of terminal control devices are connected via a line such as a (rea network), and one or more terminals are connected to each terminal control device as its subordinates, generating terminal transmission data such as application programs in the information processing device. Transmission data from the source is transmitted to the terminal through the line and the terminal control device.

In such a system, as a conventional method for determining a terminal that needs to transmit data, that is, a terminal that has a transmission request from a large number of terminals under the line connected to the system, the conventional method is A method is known in which all terminals under the line are searched to determine whether or not each terminal is a transmission request terminal, and if the terminal has a transmission request, the transmission operation is executed.

[Problems to be solved by the invention]

However, in the above-mentioned conventional method, regarding the data transmission to the terminals under the control of a plurality of terminal control devices connected to the information processing apparatus via the line, it is searched for all the terminals under the line and the terminal requesting the transmission is searched. In the system configuration in which many terminals are connected under the line, for example, in a system constructed by a packet switching network or LAN, it is not possible to promptly determine the terminal that has a transmission request. there were.

The present invention has solved the above-mentioned conventional drawbacks, and an object thereof is to be able to promptly determine a terminal having a transmission request.

[Means for solving problems]

In order to achieve the above object, the present invention provides a data transmission schedule method for a terminal in a system in which a plurality of terminal control devices each having at least one terminal under the control are connected to an information processing device via a line. When a terminal having data to be transmitted occurs, a transmission link generation means for linking a terminal control device having the terminal under its control as one of the terminal control devices to be subjected to transmission processing in the order of transmission request; And a transmission link reading means for sequentially deciding a terminal having data to be transmitted among the terminals under the control of the terminal linked by the transmission link generation means when executing the transmission operation to the terminal. When data transmission to all terminals having transmission requests under the control of one terminal control device determined by the link reading means is completed, And a transmission link purging means for disconnecting the transmission link of the terminal control device having the terminal which has completed the data transmission, and there is data to be transmitted to the terminals under the control of a plurality of terminal control devices connected via the line. In this case, it is configured to determine a terminal having a transmission request from among the terminals under the control of the terminal linked to the transmission link and perform the transmission operation.

[Action]

When a terminal having data to be transmitted is generated, the transmission link generation means links the terminal control device having the terminal under its control as one of the terminal control devices to be subjected to the transmission processing in the transmission request order. Therefore, the terminal control device which controls the terminal having no data to be transmitted is excluded from the transmission link.

At the time of performing a transmission operation to a terminal under the line, the transmission link reading unit sequentially determines the terminal having data to be transmitted from the terminals under the control of the terminal linked by the transmission link generation unit, When the data transmission to all terminals under the control of a certain terminal control device to which the transmission link is attached should be transmitted, the transmission link purging means disconnects the transmission link of the terminal control device.

〔Example〕

 Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram showing an example of a system to which the present invention is applied, in which an information processing device 9 is connected to a packet switching network 11 via a subscriber line 10 and a plurality of various terminal control devices are connected.
12, 13, 14 are connected to the information processing device 9 through the packet switching network 11 and the subscriber line 10, and each terminal control device 12,
13 and 14 show a system in which terminals 15, 16 and 17 are subordinates. The present embodiment is intended to provide a data transmission schedule method for terminals in which the information processing apparatus 9 performs efficient operation regarding data transmission to a plurality of terminals 15 to 17 in such a system.

FIG. 1 is a functional block diagram of a part of the information processing device 9 of FIG. 2 which realizes a data transmission schedule system to terminals 15 to 17 under the control of a plurality of terminal control devices connected via a line 10. Mailbox control unit 1, transmission link generation unit 2, line state management unit 3, transmission control unit 4, transmission link reading unit 5, transmission link purging unit 6, output message waiting queue group 7, line connection connected to line 10. The device 8 and the control block group CB include an application program AP which is a source of transmission data to the terminal.

As shown in FIGS. 1 and 3, the control block group CB is a line control block (hereinafter referred to as LCB).
30, a physical unit control block (hereinafter referred to as PUCB) 40, 41, 42, and a terminal control block (hereinafter referred to as TCB) 50, 51, 52. Here, the LCB 30 stores information necessary for line control, and PUCB (1) 40, (2) 41, (3) 4
2 stores information necessary for controlling the terminal control devices 12, 13, 14 respectively, and TCB (1) 50, (2) 51, (3) 52 are respectively terminal 1
This is a control block that stores the information necessary to control 5, 16, and 17. All PUCB and TCB under LCB30
Can be searched as will be described later, and all control blocks (LCB, PUCB, TCB) are provided in a part of the control memory in the information processing device 9.

In the LCB 30, the total number of PUCBs indicating the number of all terminal control units connected under the line 10, the number of PUCB transmission requests indicating the number of terminal control units having data to be transmitted under the line, and the transmission under the line A first transmission PUCB pointer indicating the first link used for transmission linking of the requested terminal control unit (referred to as PUCB transmission linking), the last link, and the terminal control unit currently performing transmission operation under the line. Although not shown in each field and FIGS. 1 and 3, there are other fields such as a status indicating whether or not the line is in the transmission state. LC
For the first link and last link in B30, NULL is set when no transmission link is attached (here, NULL means a state in which all bits are "1"). On the other hand, in each PUCB, a list offset indicating the number of PUCB under the LCB30 is set as an initial state in the first link and the last link.
That is, in FIG. 3, for example, a list offset indicating PUCB (1) itself is set to the first link and the last link in PUCB (1) 40 before being linked. Although not shown in FIGS. 1 and 3, each PUCB is also provided with a field for setting the number of transmission requests of all terminals connected to the corresponding terminal control device, attributes of subordinate terminals, and the like. Has been. Also, each T
The CB is provided with transmission request flags F (1), F (2), F (3) indicating the presence / absence of transmission data to the terminal handled by the CB, fields for setting the number of transmission requests of the terminal, and the like. There is.

If there is a terminal control device under the line that has a transmission request, a transmission link is attached from the first link in the LCB30 to the PUCB corresponding to that terminal control device. In this case, the last link in the LCB30 is the last link. The PUCB to which the transmission link is attached is shown, and the PUCB to which the transmission link is attached first can be searched as described later. For example,
In FIG. 3, PUCB (1) 40, PUCB (2) 41, PU
When there is a transmission request in the order of the terminals under CB (3) 42,
As shown in FIG. 1, the fast link in the LCB 30 indicates PUCB (1) 40 as indicated by, and PUCB (1) 40 to PUCB (2) 41, PUCB (2) 4 as indicated by ,.
1 to PUCB (3) 42 with transmission link, and LC
The last link in B30 indicates PUCB (3) 42,
B (3) 42 to PUCB (2) 41, PUCB (2) 41 to PUC
Linked with B (1) 40.

Next, the operation of this embodiment will be described in detail with reference to the drawings.

In FIG. 1 and FIG. 2, the transmission data to the terminals 15, 16, 17 under the control of a plurality of terminal control devices 12, 13, 14 connected via a line is generated by an application program AP, and a mailbox control unit. 1, the output message waiting queue 7 in the output message waiting queue group 7 corresponding to each terminal, that is, each TCB in FIG. 3, as a message (a logical unit of a transfer of data).
It is queued to (1), 7 (2), 7 (3). For example, the first
In the figure, the message M is sent to the TCB (1) 50 for the terminal 15.
(1) is queued in queue 7 (1) and TC for terminal 16
Message M (2) is queued to queue 7 (2) for B (2) 51 and message M (3) is queued to queue 7 (3) for TCB (3) 52 for terminal 16. Has been done. When a message sent to a terminal is queued in the output message waiting queue group 7 for the first time, the mailbox control unit 1 notifies the sending link generation means 2 of a request to send to the terminal.

In response to this, the transmission link generation means 2 discriminates the PUCB for the terminal control device corresponding to the designated terminal, and determines its P
The number of terminal transmission requests in the UCB is counted up from "0" to "1", and the PUCB is linked to the LCB30. Also, the number of PUCB transmission requests in the LCB 30 is counted up.

In the process of linking a PUCB with a transmission request to the LCB30, there is no transmission link in the LCB30.
Both the first link and the last link in B30 are NU
In the case of LL, the transmission link generation means 2 replaces the first link in the LCB 30 with the determined first link in the PUCB, and replaces the last link in the LCB 30 with the determined last link in the PUCB. For example, if PUCB (1) 40 in FIG. 3 is linked to LCB30, the first link in LCB30 is P
The UCB (1) 40 is shown, and the first link in PUCB (1) becomes NULL, and this PUCB (1) 40 is the last transmission link. The last link in the LCB30 is PU
CB (1) is shown, and the last link in PUCB (1) is NUL.
It becomes L.

On the other hand, when there is a PUCB with a transmission request in the LCB 30, that is, when the fast link in the LCB 30 is not NULL, the PUCB last attached to the transmission link is obtained from the last link in the LCB 30 and the fast link in the PUCB is obtained. The first link in the PUCB requested and determined to be transmitted is replaced, and the last link in the LCB 30 is replaced with the last link in the PUCB requested and determined to be transmitted. For example, P in FIG.
After linking UCB (1) 40 to LCB30, PUCB
(2) When 41 is further linked, the last link in the LCB 30 indicates PUCB (1), and the first link in the PUCB (1) indicates NULL, so PUCB (1)
The first link inside indicates PUCB (2), and PUCB (2)
The first link in (2) is changed to indicate NULL. The last link in LCB30 is PUCB (2) 4
1 indicates that the last link in PUCB (2) is PUCB (1)
, And the last link in PUCB (1) is NULL. In this way, linking is performed one after another.
The transmission link from the LCB 30 in FIG. 1 is PUCB (1) 4
0, PUCB (2) 41, PUCB (3) 42 are shown in this order when a transmission request is made. Then, in the process of attaching the transmission request PUCB to the LCB 30 in the transmission link generation means 2, when the last link in the transmission request PUCB becomes NULL, the line 10 is subject to the transmission schedule.

When the transmission schedule of the line 10 is executed, the line state management means 3 determines whether or not the fast link in the LCB 30 is NULL, and when it is not NULL, that is, when there is a PUCB to which a transmission link is attached, the transmission link is read. The reading request is notified to the means 5 in order to know which terminal the transmission request is.

The transmission link read request 5 responds to this by setting the pointer indicating the PUCB indicated by the fast link in the LCB 30 to the current transmission PUCB pointer in the LCB 30 and designating the PUCB to be processed first, and PUC
The TCB under the control of B is searched to determine the TCB indicating the terminal having the transmission request in the PUCB. Here, in the present embodiment, for convenience of description, only one TCB is given to one PUCB, but in reality, one PUCB, that is, one terminal control device is connected with many TCBs, that is, terminals. The transmission link reading means 5 retrieves the TCB in which the flag F indicates that there is transmission data from the large number of TCBs and sequentially determines the TCB.

Next, the TC to be transmitted by the transmission link reading means 5
When B is decided, the line state management means 3 sets the line state to the transmission mode and shifts the control to the transmission control means 4.

In order to obtain the data to be transmitted, the transmission control means 4 requests the mailbox control unit 1 to read the transmission message to the output message waiting queue corresponding to the TCB. In response to this, the mailbox control unit 1 passes the storage message data storage pointer stored in the output message waiting queue corresponding to the TCB to the transmission control unit 4 together with the transmission message read completion notification. Upon receipt, the transmission control means 4 transfers the data to a line buffer (not shown) and executes a transmission operation via the line 10 connected by the line connection device 8. When the transmission control means 4 finishes the transmission operation for one TCB, it notifies the line state management means 3 of that fact, and the line state management means 3 terminates the processing of the previously determined TCB for the transmission link reading means 5. It indicates that the job has been done and that the next TCB should be determined. In response to this, the transmission link reading means 5 counts down the number of terminal transmission requests of the corresponding current transmission PUCB, determines the next TCB, and notifies the line state management means 3 of it. The above operation is repeated until the number of terminal transmission requests in the current transmission PUCB becomes "0". When the number of terminal transmission requests in the current transmission PUCB becomes "0", the transmission link reading means 5 informs the line state. The management unit 3 is notified, and the line state management unit 3 notifies the transmission link purge unit 6 of the transmission completion of the current transmission PUCB.

Upon receiving the above notification, the transmission link purging means 6 carries out processing for removing the current transmission PUCB from the transmission link of the LCB 30. That is, the fast link in the LCB 30 is replaced with the fast link in the notified PUCB, and the next PUCB linked from the fast link in the notified PUCB is obtained, and the last link in the next PUCB is obtained. And the last link in the notified PUCB is replaced, and the LCB30 of the notified PUCB is changed.
Remove the link from. For example, in FIG. 1, PUCB
(1) When 40 is completely transmitted and removed from the link of LCB 30, the fast link in LCB 30 indicates PUCB (2) 41, and the fast link in PUCB (2) 41 is PUCB.
(3) 42, and the first link in PUCB (3) 42 is N
It becomes UL and represents the end of the transmission link. The last link in LCB30 shows PUCB (3) 42,
The last link in PUCB (3) 42 shows PUCB (2) 41, and the last link in PUCB (2) 41 becomes NULL. In addition, when the link from the LCB 30 of the PUCB that has completed the transmission is removed, the number of PUCB transmission requests in the LCB 30 is
The transmission link purge means 6 counts down by one.

Next, the transmission link purge means 6 to the line state management means 3
Control is returned to, and the first link in LCB30 is again N
Whether it is ULL or not is determined, and if it is not NULL, it means that there is a transmission link, so that the transmission schedule to the next PUCB (2) 41 is performed, and the same operation as above is repeated.

And finally, the first link in LCB30 is NUL.
When it goes to L, it means that there is no transmission link, so the line state becomes idle and it waits for the schedule.

As described above, in this embodiment, the terminals under the control of the plurality of terminal control devices 12 to 14 connected to the information processing device 9 through the line 10.
Regarding data transmission to 15 to 17, in the information processing device 9,
A line state management unit 3 that has an application program AP that is a source of data to be transmitted to these terminals and that manages information related to the state of the line 10 and a transmission control that controls data transmission to a terminal that has a transmission request In a system including the means 4, when a terminal having data to be transmitted occurs, a terminal control device corresponding to the terminal is discriminated and a transmission link is attached to each terminal control device in the order of transmission request. The generation means 2, the transmission link reading means 5 for determining which terminal is used when executing the transmission operation from the terminal control device to which the transmission link is attached, and the data transmission to all the terminals under the control of the terminal control device are completed. By providing a transmission link purging means 6 for disconnecting the transmission link of the terminal control device when If there is data to be transmitted to a terminal under the control of the terminal control device, the terminal that has the transmission request is determined from the terminal control device to which the transmission link is attached, and the transmission operation is performed. Efficient operation can be performed by limiting the range to be examined.

〔The invention's effect〕

As described above, according to the present invention, when a terminal having data to be transmitted occurs, the transmission link generation means
By linking the terminal control device having the terminal under its control as one of the terminal control devices to be subjected to transmission processing in the order of transmission request, the terminal to which data is to be transmitted at the time of performing the transmission operation to the terminal under the line is selected. When investigating, it is sufficient to search only the terminals under the terminal control device to which the transmission link is attached by the transmission link reading means, and promptly find the terminal with the transmission request as compared with the conventional method of searching all the terminals under the line. There is an effect that can be determined. Therefore, if the present invention is applied to a system in which a large number of terminals are connected to one line, a transmission service can be provided quickly, which is very effective.

[Brief description of drawings]

FIG. 1 is a functional block diagram inside an information processing apparatus that realizes a data transmission schedule method of the present invention, FIG. 2 is a block diagram showing an example of a system to which the present invention is applied, and FIG. 3 is a configuration example of a control block. FIG. In the figure, 1 ... Mailbox controller, 2 ... Transmission link generation means, 3 ... Line state management means, 4 ... Transmission control means, 5 ... Transmission link reading means, 6 ... Transmission link purging means, 7 ... Output message waiting queues,
8 ... Line connection device, 9 ... Information processing device, 10 ... Line, 11 ... Packet switching network, 12-14 ... Terminal control device,
15 to 17 ... Terminal, CB ... Control block group.

Claims (1)

[Claims] 1. A data transmission schedule method for transmitting data to a terminal in a system in which a plurality of terminal control devices each having at least one terminal under the control are connected to an information processing device via a line. When a certain terminal occurs, a transmission link generation means for linking a terminal control device having the terminal under its control as one of the terminal control devices to be subjected to transmission processing, and a transmission operation to the terminal under the line. At the time of execution, a transmission link reading unit that sequentially determines a terminal having data to be transmitted from the terminals under the control of the terminal linked by the transmission link generating unit, and the transmission link reading unit sequentially When data transmission to all the terminals that have a transmission request under the determined one terminal control device is completed, the terminal that has completed the data transmission A transmission link purging means for removing the transmission link of the terminal control device under the control is provided, and if there is data to be transmitted to a plurality of terminals under the control of the terminal control device connected via the line, the transmission link is attached. A method for scheduling data transmission to a terminal, characterized in that a terminal having a transmission request is determined from terminals under the control of a terminal control device and a transmission operation is performed.