JPS6255172B2 - - Google Patents

Abstract

PURPOSE:To prevent a resource in a decentralized control information interchange system from being held ineffectively by detecting a state dissidence between processes due to a communication failure state which occurs in a call process in its early stage. CONSTITUTION:If the communication failure state occurs between information processors A and B in a transfer process of data (c), a process P0' in the processor A sends out a disconnection request signal to a circuit L0. When a disconnection confirmation signal arrives from the circuit L0, the processor P0' is ceased. On the other hand, a process P1' in the processor B sends a reception ready signal to the process P0' and then detects a communication failure state because no reception ready signal is returned from the process P0', so a disconnection request signal is sent out to a circuit L1. The process P1' is ceased after a disconnection confirmation signal is returned from the circuit L1.

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a process abnormality detection method, and particularly to a process abnormality detection method, which comprises a plurality of information processing devices that can communicate with each other, and which
The present invention relates to a process abnormality detection method in a distributed control information exchange system that transfers information by setting up a call between arbitrary processes in an information processing device.

(b) Background of the Technology In recent years, distributed control information exchange systems that distribute functions and loads among a plurality of small information processing devices that can communicate with each other have been widely adopted. When a request (call) for information transfer occurs between lines accommodated in this type of distributed control information exchange system, each information processing device accommodating the originating line and the terminating line executes a process corresponding to the generated call. and both processes cooperate to process the call. Each process is a processing mechanism that includes a call control table that stores various information for controlling calls, and in each information processing device, as many processes as the number of calls that occur are generated, and when the call ends, Disappear.

(c) Prior Art and Problems FIG. 1 is a diagram showing an example of a conventional distributed control information exchange system. In FIG. 1, information processing devices A and B that can communicate with each other via a transmission path C are shown. Further, FIG. 2 is a diagram showing an example of the call processing process in FIG. 1. In FIG. 2, when a call request signal a for a drawing line L1 accommodated in information processing device B arrives from line L0 accommodated in information processing device A, information processing device A
generates a process P0 corresponding to the call request signal a, and transmits the call request signal a to the information processing device B via the transmission path C. Information processing device B generates a process P1 corresponding to the call request signal a, and sends the call request signal a to line L1. The call established between lines L0 and L1 as described above is controlled by processes P0 and P1. Line L0 is
After confirming that the connection enable signal b is returned from the line L1 via the processes P1 and P0, the transfer of the data c via the information processing devices A and B is started. During the process of transferring data c, when process P0 detects a communication failure state that has occurred between information processing device A and information processing device B, it sends a disconnection request signal d to line L0. When the disconnection confirmation signal e arrives from the line L0, the process P0 of the information processing device A disappears, making it possible to accept new calls that will occur thereafter. However, the process P1 in the information processing apparatus B is not notified of the disappearance of the process P0 due to the communication disabled state, and continues to be held invalid in a non-communicative state for any length of time. Such process P1 is connected to line L
For example, when a disconnection request signal d is transmitted from line L1, it disappears when a forced termination request signal f is transmitted from the information processing device A whose corresponding process P0 has disappeared, but when a signal arrives from line L1, Unless there is, the process P1 will not disappear.

As is clear from the above explanation, in conventional distributed control information exchange systems, there is no means for early detecting a state mismatch between processes P0 and P1 caused by a communication failure state that occurs during a call processing process, so information There is a drawback that the resources in the processing device B are held invalidly, and in order to cancel the invalid hold, it is necessary to rely on the arrival of a signal from the line L1.

(d) Purpose of the Invention The purpose of the present invention is to eliminate the drawbacks of conventional distributed control information exchange systems as described above, and to promptly detect state inconsistencies between processes caused by communication failures that occur during call processing. The objective is to make effective use of resources within the distributed control information exchange system.

(e) Structure of the Invention The object is to provide a distributed control information exchange system that is composed of a plurality of information processing devices that can communicate with each other and that transfers information by setting a call between arbitrary processes in any two information processing devices. wherein the information processing apparatus is provided with means for transmitting a receivable signal at a predetermined cycle for requesting the receiving process of one information processing apparatus to return the receivable signal from the transmitting process of the other information processing apparatus; This is achieved by the receiving process disappearing when an abnormality in the sending process is detected.

(f) Embodiment of the invention An embodiment of the invention will be described below with reference to the drawings. 3 is a diagram showing a process abnormality detection method according to an embodiment of the present invention, FIG. 4 is a diagram showing an example of the call processing process in FIG. 3, and FIG. 5 is a diagram showing an example of the call processing process in FIG. It is a figure which shows another example of a processing process. Note that the same reference numerals indicate the same objects throughout the figures. FIG. 3 also shows information processing devices A and B that can communicate with each other via a transmission path C. In FIG. However, the process P0' generated by the information processing device A that receives the call request signal a to the line L1 accommodated in the information processing device B, which is received from the line L0 accommodated in the information processing device A, sends a reception confirmation return. Process P generated by information processing device B, which is equipped with mechanism x and receives call request signal a transmitted from information processing device A via transmission path C.
1' is equipped with a receivable/output monitoring mechanism y. The process P1' of the information processing device B receives the connection possible signal b from the line L1, returns the connection possible signal b to the process P0' of the information processing device A, and then receives it by the reception possible sending monitoring mechanism y. A possible signal g is transmitted to the process P0' at a predetermined period T.
The receivable signal g requests the receiving process P0' to return a receivable signal h. Process P
1' is a reception confirmation return mechanism x from process P0'
By receiving the ready signal h sent back by the information processing device A, the corresponding process P0'
to continue controlling the call. If a communication failure occurs between information processing apparatuses A and B during the transfer process of data c, process P0' in information processing apparatus A disappears in the same process as described above. On the other hand, the process P1' of the information processing device B
When the receivable signal g is sent to the line L1, the receivable signal h is not returned from the process P0', and in order to detect the communication failure state, a disconnection request signal d is sent to the line L1, and the line L1 is disconnected. It waits for the confirmation signal e to be returned and disappears. Further, as shown in FIG. 5, when the process P1' of the information processing apparatus B sends the receivable signal g to the process P0', the communication disabled state has been recovered, but in the information processing apparatus A, the process P0' has already disappeared, information processing device A
1' is detected, and a forced termination request signal f is returned. The process P1' that has received the forced termination request signal f recognizes that the corresponding process P0' has disappeared, and disappears through the same process as shown in FIG. 4.

As is clear from the above description, according to this embodiment, the process P1' of the information processing apparatus B is controlled by the process P0 of the corresponding information processing apparatus A by periodically sending out the receivable signal g by the receivable sending monitoring mechanism y. ′
It is possible to quickly recognize the disappearance of

Note that FIGS. 3 to 5 are only one embodiment of the present invention, and for example, the state mismatch between processes that occurs during the call processing process in FIG. 3 is not limited to what is shown in the figures. Although many other modifications may be considered, the effects of the present invention remain the same in any case. Further, the distributed control information exchange system to which the present invention is applied is not limited to the one shown in the drawings, and many other modifications may be considered, but the effects of the present invention remain the same in any case.

(g) Effects of the Invention As described above, according to the present invention, in the distributed control information exchange system, a state mismatch between processes due to a communication failure state that occurs during a call processing process is detected at an early stage, and the distributed control information exchange system It becomes possible to prevent resources within the system from being held invalid.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional distributed control information exchange system, FIG. 2 is a diagram showing an example of the call processing process in FIG. 1, and FIG. 3 is a process abnormality detection method according to an embodiment of the present invention. FIG. 4 is a diagram showing an example of the call processing process in FIG.
This figure is a diagram showing another example of the call processing process in FIG. 3. In the figure, A and B are information processing devices, L0
and L1 is the line, C is the transmission line, P0, P1, P
0' and P1' are processes, a is a call request signal,
b is a connection enable signal, c is data, d is a disconnection request signal, e is a disconnection confirmation signal, f is a forced termination request signal,
g and h indicate the receivable signal, and T indicates the period.

Claims (1)

[Claims] 1 In a distributed control information exchange system that consists of a plurality of information processing devices that can communicate with each other and that transfers information by setting up a call between any processes in any two information processing devices, one information processing device receives When the information processing device is provided with means for transmitting a receivable signal at a predetermined cycle, the side process requests the sending process of the other information processing device to return the receivable signal, and an abnormality in the sending process is detected. A process abnormality detection method characterized in that the receiving process disappears.