JPS6249464A - Equipment access control system - Google Patents

Abstract

PURPOSE:To execute control of an input/output device used in common by plural processing devices of a computer system efficiently reducing overhead of OS executed by the processing devices and improve capacity of the system by controlling access number of equipment individually by each OS. CONSTITUTION:An interface controlling section 20 receives command from a processing device together with equipment number as before. When the command is equipment number allocation request command, the controlling section gives the received equipment number to an access equipment number receiving section 22. The access equipment number receiving section 22 allocates to an input/output device of vacant state according to an equipment number allocation table 23. When input/output command is received after that as before, an input/ output command processing section 21 converts received equipment number to input/output device equipment number making the received equipment number access equipment number according to the equipment number allocation table 23, and controls the input/output device as before using the equipment number.

Description

[Detailed Description of the Invention] [Overview] This is a control method in which the input/output device connected to the control device is accessed from the processing device. When the processing device specifies an access device number, the control device selects one of the input/output devices and assigns it to the access device number. Thereafter, by specifying that access machine number, you can access the input/output device assigned to it.

[Industrial application field]

The present invention relates to a control method for accessing an input/output device connected to a control device of a computer system from a processing device.

When an input/output device of a computer system performs input/output operations, the operating system (hereinafter referred to as O8) running on the processing device must know the device number that is fixedly set for the input/output device. The input/output command issued to the control device clearly indicates the target input/output device number.

Therefore, normally, the O8 grasps the status of the input/output devices connected to the control device and manages them so as to identify whether it is possible to start an input/output operation.

[Prior art and problems to be solved by the invention] FIG. 2 is a block diagram showing an example of the configuration of a computer system.

Processing devices 1 and 2 of the computer system are each operated under the management of an individual O8.

The control device 3 includes processing devices 1 and 2 of such two systems.
It is possible to connect to and accept input/output commands from any processing device and control the execution of input/output operations of the input/output devices 4, 5, 6, etc.

For the control device 3 and the input/output devices 4 to 6, machine numbers, which are addresses that specify them, are set, for example, at the time of system configuration, and each device can recognize its own machine number. The input/output devices 4 to 6 connected thereto can be specified by their machine numbers.

When the processing device 1 or 2 starts the input/output operation of the input/output devices 4 to 6, it specifies a required one of the input/output devices 4 to 6 and controls that input/output device. An input/output command is issued to the control device 3 in a known manner.

The control device 3 is an interface system, as shown in FIG. The ff11 unit 10 detects the machine number specification, and if it specifies itself, receives the input/output device machine number and the input/output command and passes them to the input/output command processing unit 11.

The input/output command processing unit 11 activates the input/output device of the specified machine number via the input/output interface unit 12, performs necessary activation control according to the input/output command, and
The machine number is held and subsequent input/output operations are executed.

In this case, in particular, the input/output devices 4 to 6 are of a type that is occupied by one person's output operation, such as a magnetic tape storage device, a printer device, a card reading device, etc.
In a configuration in which multiple devices of the same type are connected to the control device 3, and any of them may be used, the O3 of the processing device 1%2 is connected to each input/output device 4 to 6 that is in use. , the free status is always managed, and when an input/output request for those input/output devices is issued from a job running on processing unit 1.2, the free status is checked depending on the managed input/output device status. Select an input/output device, specify the input/output device number, and issue an input/output command.

In this case, the O8s of the image processing devices 1.2 each perform the same management as described above, but since it is necessary to know the changes in the free/used status due to commands issued by the other processing devices, Conventionally, this state management information is stored in a shared storage device 7 (for example, composed of a magnetic disk storage device) that can be accessed from, for example, the image processing device 1.2.

Therefore, a special control program is required to refer to and exclusively update the management information, and processing of the management information is required for each access, resulting in problems such as delays in input/output processing.

[Means for solving problems]

FIG. 1 is a block diagram showing the configuration of the present invention.

The figure shows the configuration of the control device, where 20 is an interface control section, 21 is an input/output command processing section, 22 is an access machine number reception section, and 23 is a machine number allocation table.

[For production]

The interface control unit 20 receives commands from the processing device along with the machine number, as in the conventional case.

When the command is a specific command (assumed to be a machine number allocation request command), the received machine number (this is called an access machine number) is passed to the access machine number receiving section 22.

The access machine number reception unit 22 uses the machine number allocation table 23 to
Assign access machine numbers to vacant input/output devices.

Then, when I/O commands are received conventionally,
The input/output command processing unit 21 uses the received machine number as the access machine number, converts it into an input/output device machine number according to the machine number allocation table 23, and uses the machine number to connect the input/output device as in the conventional method. control.

The access machine numbers are managed individually by each O3, and one of the unused access machine numbers is selected prior to issuing an input/output command, and the above machine number allocation request command is issued.

As described above, there is no need to use a shared storage device or the like between OSs, and shared management of input/output devices can be performed by simply managing access machine numbers individually, eliminating the need for conventional management overhead.

〔Example〕

In FIG. 1, an interface control section 20 receives a command from a processing device along with a machine number, as in the conventional case.

However, whether the command is a machine number assignment request command or not is identified by a predetermined command code, and if it is a machine number assignment request command, the designated machine number and, if necessary, the command are passed to the access machine number reception unit 22, It is not passed to the input/output command processing unit 21.

The machine number specified by the machine number allocation request command is a newly selected access machine number from the access machine numbers managed by each O8.

The access machine number reception unit 22 uses the machine number allocation table 23 to
Select one of the fields of an idle input/output device, that is, an input/output device to which no access machine number has been assigned, and write the received access machine number in that field to finish the machine number assignment process, and then proceed with the assignment. Sends a completion response back to the requester.

Note that if duplicate access machine numbers are allowed between the O8s that access this control device, it is necessary to store the number that identifies the access source O8 in the machine number allocation table 23 together with the access machine number.

Later, when processing an input/output command, the input/output command processing unit 21 uses the machine number allocation table 23 to obtain the input/output device machine number from the access machine number.

For this purpose, the machine number allocation table 23 is configured as a so-called associative memory whose contents include, for example, the input/output device machine number and the access machine number (and the identification number of the access source O3, if necessary). .

In the above process, if there is no vacant input/output device, an appropriate termination message indicating an unallocated state is sent to the command issuer via the interface control unit 20.

If the machine number assignment is successful, an input/output command is issued using that access machine number.

This input/output command and machine number are passed from the interface control section 20 to the input/output command processing section 21 in the same way as in the conventional case.

The input/output command processing unit 21 indexes the machine number allocation table 23 by the machine number, that is, the access machine number (and if necessary, the O8 identification number of the command issuer), and searches the machine number corresponding to the access machine number, etc. Reads the stored input/output device number.

Thereafter, this input/output device number is used to control the designated input/output device in order to execute input/output commands in the same manner as before.

When the execution of a series of input/output operations is completed, for example, the processing device issues a command specifying the release of machine number assignment, and upon receiving this command, the input/output command processing unit 21 selects the corresponding access machine from the machine number assignment table 23. Delete the number and cancel the machine number assignment.

Therefore, this input/output device becomes vacant and can become a target for machine number assignment by a subsequent new machine number assignment request command.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, management of input/output devices shared by multiple processing units of a computer system can be efficiently executed by reducing the overhead of O8 executed by the processing units. This has a significant industrial effect of improving system performance.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of a computer system, and FIG. 3 is a block diagram of a conventional control device. In the figure, 1.2 is a processing unit, 3 is a control unit, 4.5.6 is an input/output device, 7 is a shared storage device, 10.20 is an interface control unit, 11.21 is an input/output command processing unit, 12 is the human output interface section, 22 is the access machine number reception section, 23 is the machine number allocation table input/output Ibarahira 4 to Otsu, Beto, qe Moon Frog) Hita Enbi 1j\Furotsuso Zuko
1 field

Claims (1)

[Claims] In a control device that is connected to one or more input/output devices and controls the input/output devices according to a command from a processing device, an access device number specified by a specific command is set to an idle state. Means for associating with the input/output device (22, 23
), and when an input/output command specifying the access device number is received, the input/output operation of the associated input/output device is controlled (21, 23). .