JPS62145448A - Time-out avoiding system for terminal - Google Patents

Abstract

PURPOSE:To allow a terminal side to receive the processing result from a computer even when the end of execution of the processing request from the terminal in the computer is delayed by changing the timer supervisory time to a value indicated by a timer change text. CONSTITUTION:A host computer 1 receives a text having timer supervisory time from a terminal 2 to give control to a timer exit routine 5 after a time (170sec) shorter than the timer supervisory time. The processing by the computer 1 is started at a processing routine 4 by a processing request. The processing is finished normally in 2min or so, but it is supposed that 4min or so are required for the completion of many processing data items. The routine 5 calculates a new timer supervisory time for the terminal 2 by taking into the state of the processing routine into account (e.g., 4min+alpha=250sec). The time is sent to the terminal 2 as a timer change text, the timer value controlling the routine 5 is changed, the control is returned to the routine 4 to restart the processing.

Description

[Detailed Description of the Invention] [Summary] In communication between a terminal that independently monitors a timer and a host computer, a timer change message is generated using an asynchronous routine and sent to the terminal, thereby preventing the terminal from timing out. This prevents detection.

[Industrial application field]

The present invention relates to a timeout avoidance method for a terminal in which the host computer sends a timer change message to the terminal when transmission of processing results is expected to be delayed in communication between the host computer and the terminal. It is.

[Conventional technology and problems]

FIG. 4 is a diagram illustrating conventional processing when a message is sent from a terminal to a host computer. In Figure 4,
l is the host computer, 2 is the terminal, 3 is the application program, 4
indicate processing routines. host computer 1
The terminal 2 connected to the host computer 1 performs timer monitoring (monitoring the transmission/reception time of messages between the terminal 2 and the host computer 1) independently of the host computer 1. The user of terminal 2,
For example, if you want to send an image to the host computer 1, input the ADD command. Then, the terminal 2 sends a processing request message consisting of an ADD command and image data to the host computer 1. At this time, the terminal 2 clears the communication timer (for timer time monitoring), starts timer monitoring, and prepares to receive the message from the host computer 1.

If the terminal 2 does not receive the message from the host computer 1 within the timer monitoring time (timeout), the terminal 2 assumes that there is a processing abnormality in the host computer 1 and releases the message reception state.

When the host computer 1 receives, for example, an ADD command from the terminal 2, it starts an ADD command processing routine. This ADD command processing fl routine is for storing received image data in a library. Normally, host computer 1 should send the message (ADD OK in the case of ADD command) within the timer monitoring time of terminal 2.
However, due to processing overhead, it may not be possible to send the message within the timer monitoring time. In such a case, after the process is completed, terminal 2
However, since terminal 2 has already released the reception processing state, this message cannot be accepted.

[Purpose of the invention]

The present invention is based on the above considerations, and provides a communication system configured such that a host computer executes a processing request from a terminal and returns the processing result to the terminal. The purpose of this invention is to provide a time-out avoidance method for terminals that allows the terminal side to receive processing results from a host computer even if the completion of execution of a request is delayed.

[Means to achieve the purpose]

Therefore, the terminal time-out avoidance method of the present invention is a terminal that is configured to consider a host processing abnormality if a processing result message for a processing request message is not returned from the host computer within the timer monitoring time. and a host computer configured to, when receiving a processing request message from the terminal, execute a processing routine corresponding to the processing request message and send a processing result message to the requesting terminal. In this terminal time-out avoidance method, the terminal includes a timer monitoring time in the processing request message, sends the processing request message to the host computer, and requests the processing from the host computer within the timer monitoring time. When a result message is sent, the processing result message is received and processed, and when a timer change message is sent from the host computer within the timer monitoring time, the current timer time is not cleared. (The host computer is configured to continue and change the timer monitoring time to the value instructed by the timer change message, and the host computer
When a processing request message is received from the above terminal, the processing routine corresponding to the processing dependence is executed, and if it is expected that the processing cannot be completed within the timer monitoring time specified in the processing request message, The device is characterized in that it is configured to calculate a new timer monitoring time and send a timer change message to the terminal to notify the new timer monitoring time.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the drawings. FIG. 1 is a diagram showing an example of the structure of a processing request message sent from a terminal. After establishing a session with the host computer 1, the terminal 2 transmits a processing request message to the host computer 1, and writes the terminal's timer monitoring time at the beginning of this message. For example, when the timer monitoring time is set to 3 minutes, a message as shown in FIG. 1 is sent to the host computer 1. Further, the terminal 2 is configured to send a message requesting processing to the host computer 1 and then accept the following two types of messages.

(a) Processing result message on the host computer (response to the processing request message) (b) When the timer change message terminal 2 receives the timer change message, the timer monitoring time continues and new timer monitoring is started. It restarts timer monitoring at the specified time and waits for the reception of a message from the host computer 1.

FIG. 2 is a diagram for explaining the processing and structure of the application program of the host computer. In FIG. 2, 5 indicates a timer exit routine. The structure of the application program is
This structure has a timer exit routine 5 and a timer cancellation process added to the conventional structure.

The timer exit routine 5 is an asynchronous routine and is controlled in a shorter time than the timer monitoring time of the terminal 2.

If the processing at the host computer 1 is shorter than the communication timer setting value of the terminal 2, the following processing is performed at the host computer 1.

i) Receive a processing result message with timer monitoring time from terminal 2. Now, when the timer 0 time TO - Δt (Δt is a small value) has elapsed, the control is passed to the timer exit routine 5.

ii) Processing in the host computer 1 is started in the processing routine 4 based on the received message. When the processing in the host computer 1 is completed before control is passed to the timer exit routine 5 (before the terminal 2 detects a timeout), the processing result of the host computer 1 is transmitted to the terminal 2.

iii) Prevent control from passing to the timer exit routine 5 and wait for the next message from the terminal 2.

If the processing at the host computer 1 is longer than the communication timer setting value of the terminal 2, the following processing is performed at the host computer 1.

i) Receive a message with timer monitoring time from terminal 1.

When time TO−Δ has elapsed, timer exit routine 5
so that control is passed to

ii) Processing in the host computer 1 is started in the processing routine 4 according to the received message. Just before the time in processing routine 4 exceeds the timer monitoring time of the terminal, control passes to timer monitoring exit routine 5.

iii) In the timer exit routine 5, a new timer monitoring time for the terminal 2 is determined taking into consideration the processing situation.

The time is sent to the terminal 2 as a timer change message. At the same time, the timer value controlling the timer exit routine 5 is also changed and control is returned to the processing routine 4.

iv) The processing routine 4 to which control has been returned resumes processing and completes the processing within the newly set timer value. Then, the processing result is transmitted to the terminal 2.

■) Prevent control from passing to timer exit routine 5,
Waits for the next message from terminal 2.

FIG. 3 is a diagram for explaining the overall processing and flow.

Note that ■, ■, etc. indicate the order of processing.

■ When the first message (processing request $1) is sent to the host computer 1 after the session is established, the timer monitoring time of the terminal 2 is also included in the message. At the same time, timer monitoring is started. The following explanation will be given assuming that the timer monitoring time of the terminal 2 is 3 minutes.

■ Message with timer monitoring time from terminal 2 (processing request)
The host computer 1 receives this and transfers control to the timer exit routine 5 after a time shorter than the timer monitoring time (170 seconds).

(2) In response to the processing request, processing in the host computer 1 is started in the processing routine 4. Normally, processing is completed in about 2 minutes, but the number of processed data is large and it takes about 4 minutes to complete. When 170 seconds have elapsed since the timer setting, control is passed to the timer exit routine 5.

(2) In the timer exit routine 5, a new timer monitoring time for the terminal 2 (for example, 4 molecules α=250 seconds) is calculated taking into consideration the status of the processing routine. This time is sent to the terminal 2 as a timer change message. At the same time, the timer value controlling the timer exit routine 5 is also changed, control is returned to the processing routine 4, and processing is restarted.

■ Terminal 2 that has received the timer change message continues the current timer and performs time-out detection processing to detect time-out using the new timer monitoring time.
Continue receiving messages.

(2) Assuming that the processing in processing routine 4 is completed after 4 minutes, the processing results are transmitted to terminal 2.

(2) The terminal 2 receives the processing result from the host computer 1 within the timer monitoring time and normally completes the series of processing.

(2) Since the processing for the terminal 2 has been completed, the host computer 1 prevents control from passing to the timer exit routine 5 and waits for the next message.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, even if the processing time on the host side is delayed, the processing can be completed normally.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of the structure of a message sent from a terminal, Figure 2 is a diagram to explain the processing and structure of the application program of the host computer, and Figure 3 is a diagram to explain the overall processing and flow. , and FIG. 4 are diagrams for explaining conventional processing when a message is sent from a terminal to a host computer. DESCRIPTION OF SYMBOLS 1...Host computer, 2...Terminal, 3...Application program, 4...Processing routine, 5...Timer exit routine. Patent applicant Fujitsu Ltd. Representative Patent Attorney Kyotani 4th Department 1m

Claims (1)

[Claims] If a processing result message for a processing request message is not returned from the host computer within the timer monitoring time, the terminal is configured to assume that the host processing is abnormal, and when the processing request message is received from the above terminal, the corresponding A terminal time-out avoidance method in a communication system comprising a host computer configured to execute a processing routine corresponding to a processing request message and send a processing result message to a requesting terminal, the terminal includes the timer monitoring time in the processing request message and sends the processing request message to the above host computer, and when the processing result message is sent from the above host computer within the timer monitoring time, the processing result message is sent. When a timer change message is sent from the host computer within the timer monitoring time, the timer continues without clearing the current timer time, and the timer changes to the value specified in the timer change message. The host computer is configured to change the monitoring time, and when it receives a processing request message from the terminal, it executes a processing routine corresponding to the processing request, and within the timer monitoring time specified in the processing request message. If it is predicted that the process will not be able to be completed, the system is configured to calculate a new timer monitoring time and send a timer change message to the terminal to notify the new timer monitoring time. A timeout avoidance method for terminals that use