JPH01196942A - Cut-off response command control system - Google Patents

Abstract

PURPOSE:To limit the cut-off processing due to timeout to one position by means of a low-order path cut-off reply command processing by causing the timeout forcibly in the reception of cut-off notice from a low order module to a low order path resource under timer monitor. CONSTITUTION:When a low order path is going to be cut-off, corresponding low order path resource 20-22 are connected to a timer queue 1, a timer monitor processing unit 3 monitors periodically the timer queue 1 to decrement timer counters 200-220 in the low order path resources 20-22 and it is recognized to be timeout when the content is zero. The cut-off notice reception 50 is applied during timer monitor, and when the object is the low order path resource under queueing such as 21, the timer counter 210 is set '1' and the timer counter 210 is decremented by the timer monitor processing 3 afterward and the content is set to '0', and the low order path cut-off response command is processed by a low order path cut-off reply 30 due to timeout. Thus, both the processings are made identical.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a disconnection response instruction control system, particularly a communication control program, which provides a lower bus disconnection processing instruction when a timeout occurs while waiting for a disconnection notification from a communication partner; The present invention relates to a control method for instructing a disconnection response to a lower module in the event of multiple failures in which an asynchronous disconnection notification is accepted from the lower module.

[Conventional technology]

This type of conventional disconnection response instruction control method checks the presence or absence of resources (unique information) for lower-level buses in order to prevent double pressure on issuing disconnection response instructions to lower-level modules based on the two types of events described above. A flag is set on the management table to indicate whether the lower-level bus is disconnected or not.
In each of the disconnection process due to a timeout and the process of accepting a disconnection notification from a lower module, the management table is checked to determine whether or not to issue a lower-level bus disconnection response instruction.

[Problem to be solved by the invention]

The conventional disconnection response instruction control method described above requires the preparation of a table, which requires memory resources for this table. This method checks the management table in each reception process and determines whether or not to instruct the lower-level bus disconnection response, so it is difficult to synchronize both processes, and the same process is dispersed. be.

[Means to solve the problem]

The method of the present invention is a disconnection response instruction control method for a lower module in the case of multiple failures in which lower-level bus disconnection due to a timeout and reception of an asynchronous disconnection notification from a lower-level module occur while waiting for a disconnection notification from a communication partner in a communication control program. When the asynchronous disconnection notification reception is for the lower-level bus before the timeout, display the status immediately before the timeout on the resource corresponding to the lower-level bus, so that the asynchronous disconnection notification reception is recognized in the same way as the one due to the timeout. It is characterized by the following.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram showing the configuration of the present invention, and shows the disconnection response instruction control for the lower module 5 when the three lower bus resources sb, 20, 21, and 22 are connected to the timer kinny 1.

Here, the lower bus refers to the AP interface section in the communication control program, with the application application program (hereinafter referred to as AP) at the top level.

Core section, hardware interface section, and node
When the order of hardware is determined, it refers to the lower-ranking bus between each. Furthermore, the term "lower module" refers to a lower module among the AP interface section, the core section, and the node hardware interface section.

Now, when this module is normally communicating with the lower module 5, none of the lower bus resources are connected to the timer Kinney 1.

In this case, when a disconnection notification reception 50 is generated asynchronously from the lower module 5 due to a line failure or terminal interruption, for example, the disconnection notification reception processing 4 is activated and returns a lower bus disconnection response 60 to the lower module 5 for disconnection. .

Next, when this module attempts to disconnect the lower bus, it connects the corresponding lower bus resources (20, 21 and 22 in this example) to timer $-1, and performs the timer monitoring process 3.
periodically monitors timer queue 1 and uses lower bus resources 20.
, 21 , 22 timer counters 200, 21
Subtract 0,220. When the result of the subtraction is 0, it is recognized as a timeout, the lower bus resource is dechained from the timer Kinney 1, and a lower bus disconnection response 30 due to timeout is performed.

Reception of disconnection notification from lower module during timer monitoring 50
When you do this, the target lower bus resources become 20.21.
If K is neither of 22 and 22, the disconnection notification reception process 4 performs a lower bus disconnection response 60 because K is an asynchronous disconnection notification reception due to a line failure or terminal interruption.

Further, when the target of the disconnection notification reception 50 is the lower bus resource 1, for example 21, in the queue, the timer counter 210 is set to 1. Thereafter, the timer counter 210 is subtracted by the timer monitoring process 3, and since it becomes 0, a lower bus disconnection response instruction process is performed in the lower bus disconnection response 30 due to timeout.

〔Effect of the invention〕

As explained above, the present invention sets the timer counter in the lower-level bus resource to 1 when receiving a disconnection notification from the lower-level module for the lower-level bus resource that is being monitored by the timer.
By forcibly causing a timeout, there is an effect that the lower bus disconnection response instruction process can be reduced to one timeout disconnection process.

In addition, the lower-level bus resource that is next in the chain after the lower-level bus resource that is undergoing timeout processing will not be released without your knowledge upon receiving a disconnection notification from the lower-level module, so there is no need to manage the lower-level bus resources. ), this has the effect of eliminating the need for a management table for lower-level bus resources.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the present invention. In the figure, 1...timer queue, 3...
...Timer monitoring process, 4...Disconnection notification reception process, 5...Lower module, 20-22...
...lower bus resource, 200°210.220...
- Timer counter, 30...lower bus disconnection response instruction processing, 50...represents disconnection notification acceptance. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] In a control method for instructing a lower module to respond to a disconnection in the case of multiple failures in which lower-level bus disconnection due to a timeout and reception of an asynchronous disconnection notification from a lower-level module occur while waiting for a disconnection notification from a communication partner in a communication control program, When the asynchronous disconnection notification reception is for the lower-level bus before the timeout, the state immediately before the timeout is displayed on the resource corresponding to the lower-level bus, and the asynchronous disconnection notification reception is recognized in the same way as the timeout. A disconnection response instruction control method characterized by: