JPS58165164A - Managing system of information source - Google Patents

Abstract

PURPOSE:To make it possible that each CPU shares each resource and uses it freely and efficiently, by providing a resource managing CPU independently. CONSTITUTION:Interfaces I/F1-I/Fn are interposed between individual operation processing devices CPU1-CPUn constituting a multi-CPU system and a private CPU (R-CPU) managing use conditions of m-number of resources RS1-RSm which are used commonly by respective CPUs. Each of these interfaces is provided with areas for an allocate flag and a release flag transmitted from each CPU to the R-CPU, areas for an enable flag and a dead lock flag transmitted from the R-CPU to each CPU, and a resource number register for an objective resource to which each CPU sets a number. Connection and release between each CPU and each resource are performed by individual interfaces and the R- CPU.

Description

[Detailed Description of the Invention] Regarding an information source management method for managing the input/output of information data between several information sources, the present invention particularly relates to an information source management method that allows each CPU to directly and commonly use each information source. It is something.

In general, in so-called multi-CPU systems, which are designed to improve the amount of work, processing speed, and various functions, multiple CPUs control multiple resources, such as information sources, such as printers and disks. In the case of shared use, if multiple OPUs access the same resource at the same time, the information data in that resource may be destroyed, or separate information data may be mixed, resulting in the desired data not being accessed. There is a risk that the process will not be possible.

In this way, when multiple OPtJs share and use the same resource... Conventionally, as a means of rounding to avoid the above situation, it is possible to access any single resource. By limiting the CPU to any single CPU, other CPUs can only indirectly access the resource, and by providing a bladder for the resource to indicate that it is active. This prevents OPUs from accessing the same resource at the same time. Therefore, in the past, the mode of operation of such a multi-CPU system was extremely complicated, the degree of freedom was limited and low, and multiple CPUs
The efficiency of input/output of information data between the IFWkIl and multiple resources is low, and there is a risk that the IFWkIl CPUs will compete for each resource and the entire multi-CPU system will end up in a so-called deadlock state. There are nine drawbacks.

It is an object of the present invention to eliminate the above-mentioned nine conventional drawbacks and to provide separate OPUs for resource management so that each OPU
The object of the present invention is to provide a resource management system that allows users to directly share each resource and use it freely and efficiently.

The present invention will be described in detail below with reference to the drawings.

A configuration example of a multi-CPU type information source management device according to the method of the present invention is shown in Part 1v! J(2), @, and a time chart showing the aspect of its management operation is shown in FIG.

In the configuration shown, CPU/N0PUn is
Each individual OPU, that is, an arithmetic processing unit that constitutes the PU system), and the resource management CPU R-cptt is
Resources 7~ commonly used by UCPU/-0PUn
This is a dedicated CPU that manages the usage status of mR8-/-R3-yrr. The connection between each CPU CPU/~, n and the resource management section CPU R-CPU is
F/ to I/Fn are interposed respectively. Each interface I/F/~I/F n has the first V! JCB)
As shown in K, the allocate 7 lag and release flag signals are sent from each CPU CPU/N0PUn to the resource management CPU R-CPU K, and each OPU/~n CP is sent from the resource management CPU-apu to the resource management CPU R-CPU K.
Enable flag and deadlock Buddha sent to U/N0PUn and each OPU/~n
A resource number register is provided for which the CPU/N0PUn sets a numerical value.

Each individual interface I/F /~I of such configuration
/Fn and resource management 0PUR-CPU for each cPU 0PU-/NCPU-n and each V-X
/~mR8-/-R8-m and the mutual linkage and release thereof are performed. That is, in the information source management method of the present invention, each CPU
1F) CPU is a resource / ~HR8-/
-R8-m, when inputting/outputting information data is desired, information source management is performed as follows.

, 1゛.

l) Each CPU @ waits until the resource management 0PUR-CPU sets an enable flag for the number of the resource it wishes to use. Period 1 shown in FIG. 2 indicates this waiting period.

l) 0PUR-CPU for resource management is
Check and nick the allocate flag of the twinter 7 ace, for example, via the scanning switch tn of each interface, that is, the scanning changeover switch.9 If the allocate flag is set, the resource number register of that interface is The contents are read, the desired resource is determined, and a connection is established for mutual exchange of information data. In addition, if a resource specified by one of the CPUs is a resource that is used exclusively, and that resource is being used by another CPU at that time, the resource will no longer be used and a standby state will occur.
The setting of the enable 7 ladder is suspended until it becomes 1, and if there are specifications from multiple CPUs, connections with the resources are sequentially performed in accordance with the order of the specifications. Furthermore, if the specified resource is not being used at that time, the enable flag is immediately set. Furthermore, even if the resource designated by 1 is not a resource to be exclusively used, enable 7 ladder is immediately set in response to the designation from the CPU.

-) Each 0PIJ @ confirms that the enable flag is set and starts inputting and outputting information data to and from the specified resource, and the resource management 0PUR-QPU does not intervene at this time. .

When the input/output of the information data is completed, the number of the resource is set in the resource number register, and the release flag is set to release the connection with the resource. The period n shown in the bottom column of the time chart shown in the second figure corresponds to this period. Note that even in the case where K cpty uses a plurality of resources in parallel, connection with the plurality of resources can be achieved according to the above-mentioned processes (1) and (-), respectively.

lv) 0PUR-CPU for resource management is
The release flag of U is checked in the same manner as the allocate flag, and if it is set, the content of the resource number register of that interface is referenced and the connection between that CPU and the specified resource is released. Do the following.

V) For example, Lyso-Xt, 2R8-/, R8
- Let J be an exclusively used resource and CPU/C
PU-/ uses resource /R8-/, and (
The iPU CPU is using the resource R8-2 and allocates 7 for that resource /R8-/.
When the lag is turned on, the CPU/0P
U-/Ka Resource Co. R8-J Allocate 7 with K
When setting the lag, K is CPU/CPU-t and C
The PU and CPU-2 are mutually waiting for the other to disconnect the resources being used, and this waiting state continues to cause a deadlock state.
There is a risk that the entire PU system will stop functioning. To avoid the occurrence of such a situation, the ninth step is to use the CPU for resource management.
In the OPU, when such a situation occurs, the deadlock flags of the interfaces of the corresponding CPUs are set, and each CPU receives the flag signal and then immediately O Stop the information processing process, and □ cancel the connections of all connected resources. (Time chart shown in second diagram)
Period B in the bottom column of K indicates the period in which the deadlock flag is set.

As is clear from the above description, according to the present invention, the degree of freedom in rinse management in a multi-0PtJ system is increased, the efficiency of inputting and outputting information data between each OPU and each source is increased, Moreover, it is a stable multi-CPU system with no risk of the entire multi-CPU system stopping or deadlocking due to resource contention.
system can be constructed.

[Brief explanation of the drawing]

FIG. 1 (4) is a block aI! showing a configuration example of a multi-CPU type information source management device according to the present invention. ! FIG. 1 (8) is a miniature diagram showing an example of the configuration of the I/F, and FIG. 2 is a time chart showing the mode of operation. CPU-/NCPU-n-H- Arithmetic processing unit (CPU)
,1/F/~I/y J.++ Ill interface,',. R-0PtJ...CPU for resource management. RS-/-RS-m-... Information source (resource).

Claims (1)

[Claims] In an information source management method that manages the input/output of information data between iii+i CPUs and a plurality of information sources, by intervening a CPU that determines whether or not the information sources can be used, An information source management system characterized by a CPU and a unit capable of inputting and outputting information data by connecting each of the plurality of information sources.