JPS60110046A - Resource controller - Google Patents

Abstract

PURPOSE:To facilitate exclusive control for use of resources with a computer system having no clock function by producing an interruption when the contents of a memory storing the using state of resources are equal to a specific value. CONSTITUTION:When a certain program delivers requests for resources 61-6n which cannot be used simultaneously with other program for an OS, the OS registers the corresponding program to a waiting line and sets the state of a request signal line 7 at 1 to shift the control to another program. In this case, all flags of a momory 1 are set at 0 as long as the resources 61-6n are all available. Then an interruption signal is produced from an interruption generating circuit 2. Thus an interruption processing program of the OS is started, and the resources 61-6n are allocated to the programs connected to the head of the waiting line. Then the program is set under an executable state and removed from the waiting line, and the state of the line 7 is set at 0.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a resource management device for managing resources in a computer system.

Conventional configuration and its problems One of the non-essential functions of the operating system (hereinafter referred to as O8) is a resource management function.

Resources are things that are necessary for processing in a computer system, and include physical devices such as the central processing unit, main memory, and input/output devices, as well as logical devices such as O8 functions and data collections. Including things. Therefore, it is no exaggeration to say that the processing power of a computer system depends on how effectively various resources are allocated.

A conventional resource management method will be explained below.

When a plurality of programs share a single resource that cannot be used simultaneously, the resource management function performs exclusive control so that while one program is using the resource, other programs cannot use the resource.

Furthermore, when executing a program that requires a plurality of resources at the same time, execution of the program is started when all the resources required by the program become available.

When a program requires multiple resources at the same time, multiple flag bits indicating the usage status of each resource are provided in the main memory corresponding to each resource, and the status of the flag bits is referenced. Checks the availability of each resource required by the program. If all the resources requested by the program are n1 available, the flag bits corresponding to the resources are updated to indicate that they are in use, making the resources unavailable to other programs. to show that That is, by updating the flag bit indicating the usage status of the resource to indicate that it is in the usage status, other programs are prohibited from using the resource and exclusive control is performed.

However, in order to perform the above-mentioned exclusive control, while performing the series of reference and update processes for the flag pin,
It is necessary to prohibit reference and update of the flag bits by other programs. If a reference from a Noh program,
If updates are allowed, a situation may occur in which multiple programs use resources that cannot be used simultaneously.

In order to avoid problems like the above, the flag bits can be referenced and updated by occupying the bus, making them an inseparable process and allowing other programs to reference them.

You can prohibit updates.

However, the function that performs a series of processing while occupying the bus (
Computers that do not have a bus lock function (hereinafter referred to as a bus lock function) cannot perform exclusive control as described above, and therefore cannot perform other controls on resource use.

Purpose of the Invention The present invention improves resource management by using interrupts to exclusively control multiple resources that cannot be used simultaneously by multiple programs in a combicoater system that does not have a bus lock function. The present invention provides a resource management device that performs the following tasks.

Composition of the Invention The present invention provides a storage device that is provided with a plurality of flag bits that do not indicate whether or not resources can be used, and that when the contents of the storage device reach a certain specific state, the information is sent to a central processing unit. This resource management device is equipped with an interrupt generation circuit that generates an interrupt when the contents of the storage device reach a specific state in a computer system that does not have a bus lock function. Interrupts are used to manage the use of multiple required resources at the same time.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a resource management device according to the present invention.

1 represents each resource of the computer system 61.62-6
A storage device provided separately from the main storage device in order to realize a set of flag bits that store the usage status of resources 61, 62 to 6n in one-to-one correspondence with n, 2 is each flag bit of storage device 1 The output of the storage device 1 and the request signal line 7 indicating that there is a request to use the resources 61,62 to 6n are input.
3 is an interrupt generation circuit that generates an interrupt signal when all flag bits of indicate an unused state and the request signal line 7 is in a state where there is a request to use a resource. An interrupt signal line 6 that transmits to the processing unit 4 guarantees a sufficient external pulse width for the central processing unit 4 to accept the interrupt signal, and also connects the storage device 1 to the interrupt signal line 6.
This is a delay circuit that delays the interrupt signal to ensure that the flag bit of the interrupt signal is set to indicate that it is in use.

FIG. 2 is a circuit diagram showing a specific configuration of this embodiment.

In FIG. 2, each flag bit of the storage device 1 is configured using a Frisophore, and if the resource corresponding to the flag bit is available, "O" is set; otherwise, the flag bit is set to "O". “ is set.

The interrupt generation circuit 2 is configured to generate an interrupt signal when all flag bits of the storage device 1 are 11 o II and the state of the request signal line 7 is '1'. .

The delay circuit 6 connects an even number of impulses in series, sets all the flag bits of the storage device 1 to "P1", and outputs the interrupt signal with a sufficient delay for the central processing unit 4 to receive the interrupt. (11) is done so that it is given to .

The operation of the resource management device of this embodiment configured as described above will be described below.

When a certain program issues a request to O8 for resources 61, 62 to 6n that cannot be used at the same time as other programs, O8 connects the program that requested the resource to a queue and puts it in a waiting state. After changing the state to par1, the control is transferred to another program.The queue is connected to the queue so that the resource is not used by multiple programs at the same time. It is provided to sequentially allocate resources to programs that are in a state.

When the state of the request signal line 7 becomes “1”, the resource 61.6
If all flag bits 2 to 6n can be used, that is, if all flag bits of the storage device 1 are '0 +-, then the interrupt generation circuit 2
generates an interrupt signal. The interrupt signal reaches the central processing unit 4 via the interrupt signal line 3. Central processing unit 4
When an interrupt signal arrives at , an interrupt processing program forming part of O8 is started, and during the processing of the interrupt processing program, it is determined that the interrupt signal indicates that all resources are available. O8 allocates resources 61, 62 to 6n to the program connected to the head of the queue, makes the program executable, and removes it from the queue. At this time, if the queue becomes empty, the state of the request signal line 7 is set to "0".

The interrupt signal also functions to reset all flag bits of the memory device 1 to a11+ via the delay circuit 5. At this time, the delay circuit 5 delays the interrupt signal to ensure that the flag bits of the storage device 1 and the central processing unit 4 can receive the interrupt.

On the other hand, if even one of the requested resources 61.62 to 6n is unavailable, that is, if even one of the flag bits of the storage device 1 is II 111, no interrupt will occur, so the resources 61.62 The program that requested ~6n is connected to the queue and waits until all requested resources are available.

When the resource occupied by the other program is released and becomes usable due to the termination of another program, the flag pino hu* source of the storage device 1 corresponding to the released resource is activated by a signal indicating that the resource has been released. ’ cents. Then, when all flag bits of the storage device 1 become ItOII, an interrupt signal is generated by the interrupt generation circuit 2,
Perform the operations described above.

Thereafter, operations similar to those described above are repeated, and resources are automatically managed.

As described above, according to this embodiment, when a program simultaneously requests multiple resources that cannot be used simultaneously by other programs, if all the requested resources are available, the resource is exclusive to the program. It becomes possible to allocate the In addition, if even one of the requested resources is unavailable, it is possible to prevent resource allocation until all resources are available, which is useful in computer systems that do not have a pass lock function. However, even if the resource usage is limited, exclusive control of resource usage as described above can be easily achieved.

Note that the present invention does not limit the polarity of the reliability of the flag bit of the storage device 1 to only the polarity described in this embodiment.

Furthermore, the present invention does not limit the delay circuit 6 to the configuration shown in this embodiment.

Effects of the Invention As described above, the present invention has a bus lock function by providing a storage device that represents the resource usage status and an interrupt generation circuit that generates an interrupt when the contents of the storage device reach a specific value. Exclusive control of resource use can be easily achieved even in computer systems that do not have a computer system, and its practical effects are significant.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a resource management device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a specific (11) configuration of the same embodiment.-1...Storage device , 2... Interrupt generation circuit, 38. - Interrupt signal line, 4... Central processing unit, 5-,
=Delay circuit, 61.62-6n... Resources, 7.
・・・・・・Request signal embryo (. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure-

Claims (1)

[Claims] There is a storage device consisting of a set of flag bits that corresponds one-to-one with the resources of a computer system and displays the usage status of the resources, and a program that requests output of the flag bits of the storage device and use of the resources. an interrupt generation circuit that receives a request signal line indicating that the resource is to be used, and generates an interrupt signal when all of the flag bits indicate an unused state and the request signal line indicates that a program requesting the use of the resource exists; A central processing unit to which the output of the interrupt generation circuit is connected to an interrupt signal input terminal, and a delay to the interrupt signal to ensure the reset operation when the storage device is reset by the output of the interrupt generation circuit. and a delay circuit that gives
When a program running in the computer system requests a plurality of the resources that cannot be used simultaneously by other programs, it sends a signal indicating a request to use the resources to the request signal line, and The system detects through an interrupt that all the resources are available, gives the resources to the program that issued the request, and performs exclusive control by resetting all the flag bits of the storage device to the usage state. resource management device.