JPH02165253A - Terminal control system - Google Patents

Abstract

PURPOSE:To eliminate an overhead and to improve memory using efficiency by transmitting the control telegraphic message of a fact of occupying a terminal and confirming the occupied state of the terminal, before a work telegraphic message is transmitted from plural host processors to a shared terminal. CONSTITUTION:When a work processing request to a terminal 40 is generated in a host processor 10, the control telegraphic message of a fact of occupying the terminal 40 is transmitted prior to the transmission of a work telegraphic message. When the telegraphic message is received, a sub-host processor 30 checks the state of the terminal 40 by a queue Q, and returns the response telegraphic message of acceptance to the processor 10 unless the terminal is occupied by other processor. Subsequently, a fact that the terminal 40 is occupied by the processor 10 is set to the queue Q. The processor 10 transmits repeatedly the work telegraphic message to the terminal 40 until the work processing is ended. In such a manner, the overhead caused by a retry processing is eliminated and the memory using efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a terminal control system, and particularly in a system in which a plurality of host processors share a terminal connected to a sub-host processor. The present invention relates to a terminal control method suitable for occupying a terminal.

[Conventional technology]

One type of distributed processing system is the i1V hierarchical system, which consists of multiple host processors, sub-host processors (also called distributed processors) connected to them via a transmission network, and terminals connected to the sub-host processors. There is a distributed processing system.

In conventional systems of this kind, when multiple host processors request the transmission of business messages to the same terminal, the sub-host processor first processes the output of the business message of the host processor that received the transmission request to the terminal. , a rejection response is returned to other host processors, and the host processor that receives the rejection response holds the business message in a transmission buffer and performs retry processing until it becomes possible to transmit it. . In addition, as a publicly known document related to this, for example, JP-A-62-214460 can be mentioned.

[Problem to be solved by the invention]

In the above conventional technology, the host processor that receives a rejection response to the transmission of a business message has to keep the business message in the transmission buffer and repeat the retries and processing until it can be sent. There were problems with overhead and memory usage efficiency.

An object of the present invention is to eliminate the need for host processor retry processing when receiving a rejection response from a sub-host processor for sending a business message to a terminal in a system in which multiple host processors share a terminal connected to a sub-host processor. The objective is to provide a terminal control method that allows

[Means to solve the problem]

In order to achieve the above object, the present invention provides a sub-host processor with a means for managing the occupancy status of a terminal connected to the sub-host processor, and before sending a business message from the host processor to the terminal, The main feature of this is that it transmits a control message indicating that it occupies the terminal, receives a response message of acceptance from the sub-host processor, and then transmits a business message.

[For production]

When a sub-host processor receives a control message to occupy a terminal from a certain host processor, and if the terminal is not occupied by another host processor, the sub-host processor places the terminal in an occupied state and sends an acknowledgment request to the host processor. After returning the response A4 message and completing the series of business processes, the control message to release the terminal from the occupied state is received from the city record host processor, and the occupied state of the terminal is released. On the other hand, if the terminal is occupied by another host processor, the control message is queued, and when the occupied state of the terminal is released, an acceptance response message is returned to the host processor.

As a result, the host processor only needs to send a control message indicating that the terminal is occupied, wait for the sub-host processor to return an acceptance response message, and then create and send the business WJfti message. There is no need to repeat the process from 1 to 1 with the setting set to .

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the configuration of a system targeted by the present invention.

In FIG. 1, a plurality of hosts 1 to processors 10□ to 1
0m is connected to a sub-host processor (also referred to as a distributed processor) 30 via a transmission network 2o, and a plurality of terminals 40□ to 40o are connected to this sub-host processor 30. The sub-host processor 30 holds processing request keys Q-Qn for each terminal.

Now, host processor 10, 102 is terminal 40□
The terminal control method of the present invention will be explained by taking as an example the case where the terminals are shared. FIG. 2 shows an example of how messages are sent and received between the host 1, processors 10, 102, sub-host processor 30, and terminal 401 in this case, FIG. 3 is an example of the message format, and FIG. 4 shows the host processor 101. ,10.
and processing flowchart 1- in the sub-host processor 30
It is.

When a business processing request for the terminal 40□ is generated, the host processor 10 transmits a control message (occupation request message) indicating that the terminal 40□ will be occupied prior to transmitting the business message (step 101). When the sub-host processor 30 receives the occupation request message, it checks the status of the terminal 40□ in the queue Q□ (step 201), and if the terminal 40 is not occupied by another host processor, it sends an acceptance response message. It returns to the host processor 10, and sets the queue Q to indicate that the terminal 401 is occupied by the host processor 10 (step 202).
.

When the host processor 10□ receives a response message of acceptance to the terminal occupation request, it repeats sending a series of business messages to the terminal 40 via the sub-host processor 30 until the desired business process is completed ( Step 10
2, 103), the sub-host processor 30 outputs the received business message to the terminal 40□, and returns a response message to that effect to the host processor 10□ (step 204).

When the series of business processes for the terminal 40□ is completed, the host processor 30□ transmits a control message (release request message) to release the occupation of the terminal 40□ (step 10
4). When the sub-processor 30 receives the release request message, it resets the occupation status of the queue Q by the host processor 10, and returns an occupation release response message to the host processor 10□ (step 205). Thereafter, the sub-host processor 30 checks the status of the queue Q□ (step 206), and if there is an occupation request from another host processor, it returns an acceptance response message to the corresponding host 1 to processor in the order of acceptance, and sends an acceptance request to the terminal 40. A message is sent to the queue Q that □ is occupied (step 202).

On the other hand, when a business processing request for the terminal 401 occurs in the host processor 102, it transmits a control message (occupation request message) indicating that the terminal 401 will be occupied (step 10
1). In the sub-host processor 30, check the queue Q□ in the state of the terminal 40 (step 2o1). If the terminal 401 is already occupied by another host processor, the terminal occupancy request of the host processor 102 is sent to the queue Q. Then, the occupancy request process is terminated (step 203). Thereafter, when the occupied state of the terminal 40i is released, the sub-host processor 30 accepts and processes the terminal occupation requests in the queue Q□, and the post-processor 10
When the second terminal occupation request is received, a response message of acceptance is returned to the host processor 102 (step 202). Upon receiving this, the host processor 302 creates a business message and sends it to the terminal 40□ (step 102).

In this way, before sending a business message from the host processor to the terminal, the host processor sends a control message that occupies the terminal, so that the host processor can hold the business message in the transmission buffer and receive it. It is possible to control the shared terminal connected to the sub-host processor without performing one-line processing.

〔Effect of the invention〕

As described above, according to the present invention, before sending a business message from a plurality of host processors to a shared terminal connected to a sub-host processor, a control message indicating that the terminal will be occupied is sent, and the terminal is occupied. By checking the status, there is no need to repeat the try process while the business message is set in the transmission buffer, which has the effect of reducing overhead due to retry process and improving memory usage efficiency in the host 1 to processor. .

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the configuration of a system to which the terminal control method of the present invention is applied. FIG. 1 is a diagram showing an example of the format of a message sent and received between the processor and the sub-processor, and FIG. 4 is a diagram showing an example of the processing flow between the host processor and the sub-host processor according to the present invention. 10□～10. ...host processor. 20...Transmission network, 30 - Sub-host processor, 4.01~40n one terminal, Q□~Q,... Processing request key 4th section

Claims (3)

[Claims] (1) Consists of multiple host processors, a sub-host processor connected to these host processors via a transmission network, and a terminal connected to the sub-host processor, and the host processor sends business messages to the terminal via the sub-host processor. However, in a processing system that temporarily occupies a terminal to perform business processing, the sub-host processor manages the occupancy status of the terminal connected to itself, and the host processor manages the occupancy status of the terminal connected to it, and the host processor A terminal control method characterized by transmitting a control message indicating that the terminal is occupied, receiving a response message of acceptance from a sub-host processor, and then transmitting a business message. (2) The sub-host processor receives a control message from a certain host processor to the effect that the terminal is to be occupied, and if the terminal is not occupied by another host processor, the sub-host processor places the terminal in an occupied state and accepts the control message from the host processor. Claim (1) characterized in that, after a series of business processes are completed, a control message to release the occupied state of the terminal is received from the host processor, and the occupied state of the terminal is released. The terminal control method described. (3) The sub-host processor receives a control message indicating that a terminal is to be occupied from a certain host processor, and if the terminal is occupied by another host processor, the sub-host processor queues the control message and 3. The terminal control system according to claim 2, wherein when the occupied state of the terminal is released, a response message of acceptance is returned to the host processor.