JPH08278953A - Exclusive control system of computer system - Google Patents

Abstract

PURPOSE: To lighten the load on a computer or shared data device concerned in an exclusive control request to access a common resource in a decentralized processing system. CONSTITUTION: The exclusive controller 64 has a common data device queue 64 wherein the computer discrimination number, task number, and group number of an exclusive control request from one of computers 1 are queued in order by the data areas 13 of respective shared data devices 12 when the exclusive control request is made, an empty flag register 26 where a flag is set when none of the computers makes the exclusive control request in the units of the data areas 13 of the shared data device 12, and a group management table 38 which automatically generates flag areas as many as all exclusive control requests having the same group number specified by the computers 1 and sets the flag of an exclusive control request enabled to access the data area 13, thereby performing simultaneous exclusive control access to plural data areas 13 over plural shared data devices 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed processing system composed of ATM, a fiber channel or the like, for example, a plurality of computers in a mechanism node-coupled through a switch mechanism and a plurality of computers shared by these computers. The present invention relates to an exclusive control device for the purpose of eliminating simultaneous access to a shared data device from a plurality of computers in a system to which the shared data device is connected, and particularly to a plurality of computers or a plurality of computers in a distributed processing system. The present invention relates to an exclusive control device for efficiently performing shared data device access when managing shared memory or shared files between tasks.

[0002]

2. Description of the Related Art FIG. 37 is a system configuration diagram showing an exclusive control system by a conventional shared memory device, and this system includes a plurality of computers 1, a shared memory device 2 accessible from each computer 1, and a shared memory device 2. A memory area 4 in the memory device 2, an interface control device 6 between each computer 1 and the shared memory device 2, an exclusive control management area 8 provided on the shared memory device 2, and an internal bus 10 of the shared memory device 2. Composed of and.

Next, the operation will be described. In the conventional exclusive control method, an exclusive control request packet is transmitted to the interface control device 6 in order to obtain an access right from each computer 1 to the memory area 4 of the shared memory device 2. The interface control device 6 that has received the exclusive control request packet from each computer 1 issues a transaction to the internal bus 10 in order to clear the data of the exclusive control management area 8 in the shared memory device 2 after reading it. This transaction is completed with one instruction, and reading and clearing of the exclusive control management area 8 are always continuous processes. The interface control device 6 transmits the read data to the computer 1 as a packet. When the read data returned in response to the exclusive control request is 0, the computer 1 determines that the access right of the memory area 4 in the shared memory device 2 cannot be acquired, and the exclusive access is acquired until the access right is acquired. The control request packet is repeatedly transmitted. If the read data returned in response to the exclusive control request is other than 0, it is determined that the access right to the memory area 4 in the shared memory device 2 has been acquired, and the shared memory device 2 is accessed. After the access is completed, a value other than 0 is written in the exclusive control management area 8 via the interface control device 6.

As described above, in the conventional exclusive control system, each computer 1 sequentially refers to the exclusive control management area 8 to eliminate the simultaneous access to the shared memory device 2.

[0005]

However, since the conventional exclusive control method is configured as described above, it is necessary to repeatedly send the exclusive control request from the computer until the access right can be acquired by the exclusive control request. It was In addition, it is necessary to transmit an exclusive control request to each memory area when acquiring access rights to a plurality of memory areas of the shared memory at once. Therefore, there is a problem that the load of the computer or the shared data device related to the exclusive control is increased, and the processing capacity of the system is reduced.

Furthermore, the conventional system is further expanded, such that the access right can be acquired only in the order in which the exclusive control requests are received, and there is no means for acquiring the access right with priority over other computers. An exclusive control method for the above system is desired.

The present invention has been made to solve the above-mentioned problems, and in a distributed processing system,
By providing an exclusive control device that independently performs processing related to exclusive control for accessing shared resources in the system, the load on the computer or shared data device related to the exclusive control request is reduced and the processing capacity of the system is improved. The purpose is to obtain an exclusive control method that allows

[0008]

In order to achieve the above-mentioned object, the invention according to claim 1 includes a plurality of computers,
One or a plurality of shared data devices that have a plurality of divided data regions and are accessed in a data region unit from a plurality of computers, and one or a plurality of exclusive controls that eliminate simultaneous access to the shared data devices from each computer In the exclusive control method in a computer system having a device, the exclusive control device is a means for connecting a computer or a shared data device to receive various requests and decoding, and an exclusive control from each computer in a data area unit of the shared data device. An exclusive control request register that stores the presence / absence of a control request, and an empty flag register that stores the presence / absence of an exclusive control request from any computer in the data area unit of the shared data device It is characterized in that control is collectively performed for each data area of the shared data device.

According to a second aspect of the present invention, in the exclusive control method in the computer system according to the first aspect, the exclusive control device is provided with a computer for all data areas of all shared data devices connected by the coupling means. The feature is that exclusive control is collectively performed.

According to a third aspect of the present invention, in the exclusive control method in the computer system according to the first and second aspects, the exclusive control device requests the exclusive control when it receives the data area division information of each shared data device. A register and the empty flag register are automatically generated.

According to a fourth aspect of the present invention, in the exclusive control method in the computer system according to the first and second aspects, the exclusive control device receives the exclusive control request discard request from any of the computers. It is characterized in that the exclusive control request corresponding to the data area of the corresponding shared data device stored in the request register is canceled.

According to a fifth aspect of the invention, in the exclusive control method in the computer system according to the first and second aspects, the exclusive control device receives simultaneous exclusive control requests for a plurality of data areas from the computer. To do.

According to a sixth aspect of the invention, in the exclusive control method in the computer system according to the first and second aspects, the exclusive control device is provided corresponding to each of the exclusive control request registers, and the data of the shared data device is provided. Each area has a priority register for storing priority execution information of exclusive control requests from each computer, and the priority order for accessing the computers is determined according to the setting value of the priority register.

According to a seventh aspect of the present invention, in the exclusive control method in the computer system according to the first and second aspects, the exclusive control request register performs exclusive control when an exclusive control request is issued from any of the computers. The computer identification number and the task number in the request are sequentially stored for each data area.

According to an eighth aspect of the present invention, in the exclusive control method in the computer system according to the seventh aspect, the exclusive control request register is configured to control the exclusive control request when an exclusive control request is issued from any of the computers. Group numbers are sequentially stored together with a computer identification number and a task number, and the exclusive control device has a group management table for storing all exclusive control requests included in each group and accessible exclusive control requests. When all the exclusive control requests included in the group become accessible, exclusive control of access in the group is simultaneously performed in the data area of the shared data device at the same time.

According to a ninth aspect of the present invention, in the exclusive control method in the computer system according to the seventh aspect, the exclusive control request register is configured to control the exclusive control request when an exclusive control request is issued from any of the computers. Sequentially stores re-request information together with computer identification number and task number,
The exclusive control device is characterized by sequentially storing the exclusive control request again in the exclusive control request register when executing access to the exclusive control request accompanied by re-request.

[0017]

In the exclusive control system according to the first aspect, the fact that each computer has made an exclusive control request for the data area included in any of the shared data devices is stored in the exclusive control request register for each data area. Since the access right is given to each computer in order based on the information, once each computer issues the exclusive control request, it is not necessary to repeat the exclusive control request until the access right can be acquired.

In the exclusive control system according to claim 2,
An exclusive control device collectively stores exclusive control requests corresponding to all data areas of all shared data devices connected to the node coupling mechanism, and each computer has an access right to the data area of the desired shared data device. The exclusive control of is collectively performed.

In the exclusive control system according to claim 3,
When the exclusive control device receives the data area division information of each shared data device, the exclusive control request register and the empty flag register are automatically generated based on the information, so that the register configuration necessary for exclusive control of the shared data device is set. Optimization can be achieved. Further, since the unused area is not created in the register, an access right request for an unauthorized data area can be detected in the exclusive control device, so that the load of the shared data device against the unauthorized access can be eliminated.

In the exclusive control system according to claim 4,
When the exclusive control device receives a request for exclusive control discard from each computer, it clears the flag of the exclusive control request register corresponding to the data area of the corresponding shared data device to easily and quickly discard the exclusive control request. It can be carried out.

In the exclusive control system according to claim 5,
When an exclusive control request for a plurality of data areas is received from each computer, the flags corresponding to each requested data area are collectively set, so that an exclusive control request for a plurality of data areas is simultaneously made by one exclusive control request. Therefore, it is possible to improve the throughput of the exclusive control request from the computer.

In the exclusive control system according to claim 6,
By adding a priority register corresponding to the exclusive control flag register and determining the priority order of granting the access right permission to each computer according to the priority execution information, the access right of the data area can be preferentially acquired. The shared data device can be accessed according to the processing form of the computer or the processing form of the system.

In the exclusive control system according to claim 7,
Since the exclusive control device stores the exclusive control request from each computer in the exclusive control flag register in order of the computer number and the task number, it is not the exclusive control process of each computer but the exclusive control process of each task of each computer. It can be performed.

In the exclusive control system according to claim 8,
When the exclusive control device receives exclusive control request data to which a group number and a plurality of data areas requesting exclusive control are added from each computer, the exclusive control device automatically generates a group management table corresponding to the group number. When an exclusive control request to each data area managed by the group management table is permitted, the corresponding flag on the group management table is set. When all flags in the group management table are set, access rights to all data areas specified in the same group are simultaneously granted to the relevant computer, so that the computer spans multiple shared data devices. Simultaneous access to multiple data areas and rewriting of the associated data areas are collectively performed.

In the exclusive control system according to claim 9,
The exclusive control device receives the exclusive control request data to which the re-request information is added from each computer and stores it in the exclusive control request register. When the re-request information is added to the exclusive control request data retrieved from the exclusive control request register, the same exclusive control request data is stored again at the end of the exclusive control request register. Therefore, access to the same data area can be periodically given to the computer for which the re-request is specified.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. The same elements as those in the conventional example and each of the embodiments are designated by the same reference numerals, and duplicate description will be omitted.

Example 1. FIG. 1 shows a block diagram of a computer system to which a first embodiment of an exclusive control system according to the present invention is applied. In FIG. 1, this system includes a plurality of computers 1 node-connected by a switch mechanism 11 and a plurality of shared data devices 12 accessible from each computer 1.
And a plurality of exclusive control devices 14 that eliminate simultaneous access to the shared data device 12 from each computer. The switch mechanism 11 sends the packet to the corresponding transmission line 15 according to the node number described in the header of the packet sent from each computer 1. Each shared data device 12 is divided into a plurality of data areas 13 and is accessed by each computer 1 in data area units. In this embodiment, the shared data device 12 is composed of a plurality of shared data devices 12, but it may be one.

The exclusive control device 14 in this embodiment is provided corresponding to each shared data device 12. Each exclusive control device 14 connects the computer 1 and the shared data device 12 via the switch mechanism 11 and serves as a coupling means for receiving and decoding a packet including various requests, and serial data transmitted from the transmission path 15 or the like as parallel data. Node coupling interface 16 for converting into a packet and a command decoder 18 for decoding a command included in the data in the packet
And to form a node coupling mechanism. Further, it has a microprocessor 20 for performing various processes relating to exclusive control. Further, each exclusive control device 14 is connected to the shared data device 1
A flag register 22 as an exclusive control request register that stores the presence / absence of an exclusive control request from each computer 1 in units of two data areas 13 and a data area 13 of the shared data device 12.
An empty flag register 26 for storing the presence / absence of an exclusive control request from any of the computers in a unit.
The exclusive control request register in this embodiment indicates the presence / absence of an exclusive control request by a flag (bit). For example, when there is an exclusive control request, the corresponding bit is set. Similarly, the empty flag register 26 also sets the corresponding bit when all the bits of the flag register 22 are cleared.

FIG. 2 is a diagram showing formats of various commands used in this embodiment. Figure 2 (a)
Is an exclusive control request command transmitted from each computer 1 to one of the exclusive control devices 14 in order to make an access right acquisition request for the shared data device 12, and FIG. An access right permission command transmitted from the exclusive control device 14 to permit access to the data area 13 of the data device 12, FIG. 2C shows that each computer 1 that has acquired the access right requests access to the shared data device 12. This is an access completion command for reporting the completion to the exclusive control device 14. In each command, the "node number" is the destination of each command, the "computer number" is the identification number of the command issuing source, that is, its own computer, the "exclusive control device number" is the identification number of the exclusive control device 14 requesting exclusive control, The “data area number” is an identification number of the data area in the shared data device 12 that is exclusively controlled by the corresponding exclusive control device 14, and is configured with the identification number of each command.

FIG. 3 is a flowchart of an exclusive control request registration processing routine executed when the exclusive control device 14 receives an exclusive control request command. FIG. 4 is a flowchart of an exclusive control processing routine executed when the exclusive control device 14 receives an access completion command from the computer 1. FIG. 5 is a flowchart of the main routine in the exclusive control device 14. The operation of this embodiment will be described below with reference to these flowcharts.

First, the exclusive control request command shown in FIG. 2 is transmitted from the computer 1 to the exclusive control device 14 as a packet in order to acquire the access right to any data area 13 included in any shared data device 12. To be done. The switch mechanism 11 reads the node number described in the header of the received packet, and sends the packet to the exclusive control device 14 connected to the transmission line 15 corresponding to the node number. Exclusive control device 14 that received the packet
Converts the data in the node coupling interface 16 and decodes the data in the packet by the command decoder 18. The decoded data is R in the exclusive control device 14.
It is temporarily stored in AM (not shown). If the data is the exclusive control request command, an interrupt is issued to the microprocessor 20 to asynchronously execute the registration processing routine shown in FIG. It should be noted that the processing from receiving and decoding the issued command and executing the registration processing routine or the exclusive control processing routine even though the type of data, that is, the type of transmitted / received command is different, is the same in other embodiments. Therefore, the description thereof will be omitted in the subsequent embodiments.

In the registration processing routine, first, the data area number and computer number included in the exclusive control request command are read (step 101), and the computer number of the flag register 22 of the target data area 13 is corresponded based on the information. The set bit is set (step 102).

When the data decoded by the command decoder 18 is the access completion command from the computer 1, an interrupt is issued to the microprocessor 20 and the exclusive control processing routine shown in FIG. 4 is executed asynchronously.

In the exclusive control processing routine, first, the data area number and computer number included in the access completion command are read (step 111), and the computer number of the flag register 22 of the target data area 13 is corresponded based on the information. The set bit is cleared (step 112). After that, it is confirmed whether or not there is a bit set in order from the bit next to the cleared bit (bit corresponding to the next computer number) (step 113). If there is a bit set in the flag register 22, an access right permission command is generated for the computer corresponding to the bit (step 114), and the generated access right permission command is transmitted to the corresponding computer 1 (step 114). Step 1
15). When all the bits in the flag register 22 are confirmed, and if all the bits are not set (step 116), it is determined that there is no exclusive control request for this data area 13 at this time, and this data area 13 of the empty flag register 26 is determined. The flag corresponding to is set (step 117).

On the other hand, the main processing routine shown in FIG. 5 is always executed, and in this routine, it is first checked whether or not the flag corresponding to each data area 13 included in the empty flag register 26 is set. (Step 121). If a flag is set in the empty flag register 26, the flag register 2 of the data area 13 corresponding to the flag is set.
The presence or absence of the flag set for 2 is checked in order from the least significant bit (step 122). If there is a bit set in the flag register 22, the flag in the empty flag register 26 is cleared (step 123). Then, the flag register 2
An access right permission command is generated and transmitted to the computer 1 corresponding to the bit set to 2 (step 124). Then, the process returns to step 121, and the confirmation of whether the flag is set in the empty flag register 26 is restarted.

As described above, in this embodiment, each computer 1
Exclusive control of access can be requested to the shared data device 12 for each data area 13, and once the exclusive control request is transmitted, the exclusive control request necessary for acquiring the access right is acquired. There is no need to repeat until you can. Therefore, the load of the exclusive control on the computer 1 can be reduced.

Further, since the exclusive control device 14 collectively controls the shared data device 12, the access requests to the shared data device 12 do not occur frequently, so that the load on the shared data device 12 can be reduced. it can. As a result, the processing efficiency of the entire system can be improved.

In particular, by providing the empty flag register 26 in which the flags are set when all the flags included in the flag register 22 are cleared, it is possible to collectively determine whether or not there is an exclusive control request in each data area 13. Since this is done, it is possible to perform exclusive control on the shared data device 12 more quickly and efficiently.

Example 2. FIG. 6 shows a block diagram of a computer system to which the second embodiment of the exclusive control system according to the present invention is applied. A feature of this embodiment is that this system has only one exclusive control device 24, and this exclusive control device 24 performs the same processing as in the first embodiment. Therefore, the exclusive control device 24 in the present embodiment is provided with a plurality of node connection interfaces 16 and a command decoder 18 corresponding to each computer 1 in order to directly connect a plurality of computers 1 as a connection means, and also a plurality of shared data. Switch device 11 to switch mechanism 11
Connect through. Further, the exclusive control request register has, for each shared data device 12, the flag register 22 described in the first embodiment as one group. Similarly, the empty flag register 26 is also provided for each shared data device 12.

FIG. 7 shows the formats of various commands used in this embodiment. FIG. 7 (a)
Is an exclusive control request command transmitted from each computer 1 to the exclusive control device 24 in order to make an access right acquisition request for the shared data device 12. FIG. 7B shows the shared data device 12 for each computer 1. Access permission command transmitted from the exclusive control device 24 to permit access to the data area 13 of FIG. 7C. FIG. 7C shows that each computer 1 that has acquired the access right has completed access to the shared data device 12. Is an access completion command for reporting to the exclusive control device 24. FIG. 2 of the first embodiment
A field of "shared data device number" for identifying the shared data device 12 is added to each of the various command formats shown in FIG.

FIG. 8 is a flowchart of an exclusive control request registration processing routine executed when the exclusive control device 24 receives an exclusive control request command. FIG. 9 is a flowchart of an exclusive control processing routine executed when the exclusive control device 24 receives an access completion command from the computer 1. The main routine of the exclusive control device 24 is the same as that of the first embodiment shown in FIG. The operation of this embodiment will be described below with reference to these flowcharts.

First, the exclusive control request command shown in FIG. 7 is transmitted from the computer 1 to the exclusive control device 24 as a packet in order to acquire the access right to any data area 13 included in any shared data device 12. Then, as described above, the registration processing routine shown in FIG. 8 is executed asynchronously.

In the registration processing routine, first, the computer number, shared data device number, and data area number included in the exclusive control request command are read (step 201), and the data area of the target shared data device 12 is read based on that information. The bit corresponding to the computer number of the flag register 22 of 13 is set (step 202).

When the data decoded by the command decoder 18 is the access completion command from the computer 1, an interrupt is issued to the microprocessor 20 to asynchronously execute the exclusive control processing routine shown in FIG.

In the exclusive control processing routine, first, the computer number, shared data device number, and data area number included in the access completion command are read (step 211),
Based on the information, the bit corresponding to the computer number of the flag register 22 in the data area 13 of the target data sharing apparatus 12 is cleared (step 212). The process in the subsequent exclusive control processing routine (step 21
3 to 217) are the same as the processing (steps 113 to 117) in the first embodiment, the description thereof will be omitted.

Further, since the main processing routine in this embodiment may perform the same processing as that of the first embodiment on the empty flag registers 26 in all the shared data devices 12, the description of this processing will also be omitted. .

If the result of decoding the packet transmitted from the computer 1 by the command decoder 18 is not a command for the exclusive control device 24 shown in FIG. 7, the packet is transmitted to the switch mechanism 11 as it is and described in the header of the packet. The read node number is read and transmitted to the shared data device 12 connected to the transmission line 15 corresponding to the node number.

As described above, in this embodiment, by providing one exclusive control device 24 in the entire system, each computer 1 can share the data area 13 with the shared data device 12 as in the first embodiment. Exclusive control of access can be requested for each unit, and once the exclusive control request is transmitted, it is not necessary to repeat the exclusive control request necessary for acquiring the access right until the access right can be acquired. Also,
The load on each shared data device 12 required for exclusive control can be reduced.

Example 3. FIG. 10 shows a configuration diagram of a computer system to which the third embodiment of the exclusive control method according to the present invention is applied. Shared data device 2 in this system
8 is a data area 13 of each shared data device 12.
It includes a data area management area 30 storing the number of divisions as the data area division information. Since the other components are the same as those in the second embodiment, description thereof will be omitted.

FIG. 11 shows formats of various commands exchanged between the exclusive control device 34 and the shared data device 28. FIG. 11A shows the exclusive control device 3
Each shared data device 2 connected from 4 to the node coupling mechanism
8 is a data area information request command for requesting the data area information, and FIG. 11B shows a data area for reporting the division information of the data area from each shared data device 28 to the exclusive control device 34. It is a division information command.

The feature of this embodiment is that the exclusive control device 34 is based on the total number of data areas included in the data area division information command from each shared data device 28 and the flag register 22 and the empty flag register 26.
Is to be automatically generated. This makes it possible to optimize the configuration of each register 22, 26 required for exclusive control of the shared data device.

FIG. 12 is a flow chart of an automatic generation processing routine of each register which is executed when the exclusive control device 34 receives the data area division information command.
The operation of this embodiment will be described below with reference to this flowchart.

First, when the system is started up, the exclusive control device 34 transmits the data area information request command to all the devices connected to the node coupling mechanism.
The multicast flag in the header of this packet is set and the packet is transmitted to the switch mechanism 11. The switch mechanism 11 reads the multicast flag described in the header of the packet and transmits the packet to the shared data device 28 connected to the transmission path 15 corresponding to all the node numbers. Each shared data device 28 that has received the data area information request command has its own data area management area 3
The data area division information in 0 is transmitted to the exclusive control device 34 as a data area division information command. Exclusive control device 3
4 receives the data area division information command and issues an interrupt to the microprocessor 20 to send an interrupt to the microprocessor 20 shown in FIG.
The automatic generation processing routine shown in is executed asynchronously.

In the automatic generation processing routine of each register,
First, the shared data device number and the total number of data regions included in the format of the data area division information command are read (step 301), and based on this information, the flag register 22 corresponding to the data area 13 of the shared data device 28 is set to the exclusive control device. It is automatically generated in the memory 34 (step 302). Based on the total number of data areas for each shared data device 28, the empty flag register 26 is set to the exclusive control device 3
4 is automatically generated in the memory (step 303).

As described above, in this embodiment, since the flag configuration necessary for exclusive control of the shared data device 28 can be optimized, the unused flag area is eliminated and the occupied capacity of the memory is minimized. be able to. In addition, the flag register 2 for the data area 13 that does not actually exist
2 and the flag area in the empty flag register 26 is reserved as an unused flag area, the computer 1 erroneously issues an exclusive control request to the data area 13 corresponding to the unused flag area. Will be imposed on the shared data device 28. Therefore, by excluding the unused flag area in advance, an unauthorized access to the unused flag area can be detected in the exclusive control device 34 and prevented in advance. As a result, the load on the shared data device 28 against unauthorized access can be eliminated.

In the present embodiment, a description has been given of a configuration in which all shared data devices 28 are connected to one exclusive control device 34, but as in the first embodiment, one shared data device is provided for each exclusive control device. A configuration in which devices are connected is also applicable.

Example 4. Next, a fourth embodiment of the exclusive control system according to the present invention will be described. The configuration of the computer system in this embodiment is similar to that of the second embodiment shown in FIG. FIG. 13 shows a format of a command for discarding the exclusive control request transmitted from the computer 1. The "shared data device number" and the "data area number" are the same as those in the above-mentioned embodiments, but a 2-bit identification flag for identifying each is added to the head of each field. In the present embodiment, "00" indicates the shared data device number, "11" indicates the data area number, and "10" indicates the command end code located at the end. The shared data device number is followed by the shared data device number. Sequence the data area numbers in the device. This allows each to have multiple fields. of course,
The content and the number of bits are not limited.

The feature of this embodiment is that FIG.
By transmitting the exclusive control cancellation request command shown in (1), the computer 1 can cancel the previous request for acquiring the access right to the data area.

FIG. 14 is a flowchart of a registration discard processing routine executed when the exclusive control device 24 receives an exclusive control discard request command. The operation of this embodiment will be described below with reference to this flowchart.

First, the exclusive control discard request command shown in FIG. 13 is transmitted as a packet from the computer 1 to the data area 13 to which a plurality of previous exclusive requests have been made in order to discard the requests. Then, the exclusive control discard request command is recognized by the same procedure as in the above embodiments,
An interrupt is issued to the microprocessor 20 to execute the registration destruction processing routine shown in FIG.

In the registration discard processing routine, first, the 2-bit identification flag included in the exclusive control discard request command is detected, the shared data device number and the data area number are identified, and the requested computer number and all Read the shared data device number and the data area number (step 40
1), the shared data device 12 targeted based on the information
Clears all the bits corresponding to the computer number of the flag register 22 for the data area 13 (step 4
02). As a result, if all the contents of the flag register 22 are "0", that is, cleared (step 403),
The bit of the empty flag register 26 corresponding to this flag register 22 is set (step 40).
4). The exclusive control process performed after this process is the same as that of the second embodiment, and thus the description thereof is omitted.

As described above, in this embodiment, the exclusive control request can be easily and quickly discarded. Therefore, it is possible to minimize the influence on the exclusive control processing of another computer, which is caused by the processing of the unnecessary exclusive control request.

In the present embodiment, the explanation has been given of the configuration in which all the shared data devices 12 are connected to one exclusive control device 24, but one shared data device is provided to each exclusive control device as in the first embodiment. A configuration in which devices are connected is also applicable.

Example 5. Next, a fifth embodiment of the exclusive control method according to the present invention will be described. The configuration of the computer system in this embodiment is similar to that of the second embodiment shown in FIG.

FIG. 15 shows the format of the exclusive control request command for a plurality of data areas transmitted from the computer. FIG. 15 shows the format of a multiple data area exclusion control request command transmitted from each computer 1 to make a request to acquire access rights to multiple data areas. The structure of each field of this command is the same as that of the exclusive control cancellation request command in the fourth embodiment except for the command type.

The feature of this embodiment is that FIG.
When the computer 1 transmits the multiple data area exclusive control request command shown in FIG. 1, the multiple shared data devices 12 and the multiple data regions 13 in each shared data device 12 are transmitted.
That is, an exclusive control request can be simultaneously issued to

FIG. 16 is a flowchart of a multiple registration processing routine executed when the exclusive control device 24 receives a multiple data area exclusive control request command. The operation of this embodiment will be described below with reference to this drawing. To do.

First, when a plurality of data area exclusion control request commands are transmitted from each computer 1 to the exclusion controller 24 as a packet, the plurality of data area exclusion control request commands are recognized by the same procedure as in the above embodiments, and An interrupt is issued to the processor 20 to execute the multiple registration processing routine shown in FIG.

In the plural registration processing routine, first, the 2-bit identification flag included in the plural data area exclusive control request command is detected, the shared data device number and the data area number are discriminated, and the requested computer number and All the shared data device numbers and the data area numbers are read (step 501), and all bits corresponding to the computer number of the flag register 22 for the data area 13 of the target shared data device 12 are set based on the information (step 501). Step 502). The exclusive control process performed based on the set information is the same as that in the second embodiment, and thus the description thereof is omitted.

As described above, in this embodiment, exclusive control requests for a plurality of data areas 13 can be simultaneously made by one exclusive control request, and the throughput of exclusive control requests from the computer 1 can be improved.

In the present embodiment, a description has been given of a configuration in which all shared data devices 12 are connected to one exclusive control device 24. However, as in the first embodiment, one shared data device is provided for each exclusive control device. A configuration in which devices are connected is also applicable.

Example 6. FIG. 17 is a block diagram of a computer system to which the sixth embodiment of the exclusive control method according to the present invention is applied. The characteristic feature of this embodiment is that a priority register 32 is provided corresponding to each flag register 22 and stores priority execution information of the exclusive control request from each computer 1 in units of the data area 13 of the shared data device 12. Is provided. The priority order for accessing the computer can be determined according to the setting value of the priority register. Like the flag register 22, the preferential execution information used in the present embodiment is flag information composed of 1 bit each. The other constituent elements are the same as those in the second embodiment shown in FIG.

FIG. 18 shows the format of the priority exclusive control request command transmitted from each computer 1 in order to preferentially request the acquisition of the access right of the shared data device 12. The structure of each field is the same as that of FIG. 13 except for the command type, but a priority bit indicating the priority is added after the identification flag in the “data area number”.

FIG. 19 is a flowchart of a priority registration processing routine executed when the exclusive control device 44 receives a priority exclusive control request command. FIG. 20 is a flowchart of a priority exclusive control processing routine executed when the exclusive control device 44 receives an access completion command. FIG. 21 is a flowchart of the priority main processing routine of the exclusive control device 44. The operation of this embodiment will be described below with reference to these flowcharts.

First, the shared data device 12 from each computer 1
18 to obtain the access right of the data area 13 of FIG.
The priority exclusive control request command shown in FIG.
When it is transmitted as a packet, the priority exclusive control request command is recognized in the same procedure as in the above embodiments, an interrupt is issued to the microprocessor 20, and the priority registration processing routine shown in FIG. 19 is executed.

In the priority registration processing routine, first, the 2-bit identification flag included in the format of the priority exclusive control request command is detected to identify the shared data device number, the data area number and the priority designation, and the requested computer is identified. The number, all shared data device numbers, data area numbers and the corresponding priority designations are read (step 60).
1). In this embodiment, it is assumed that the priority is designated when the priority bit is set. Based on these information, all bits corresponding to the computer number of the flag register 22 for the data area 13 of the target shared data device 12 are set (step 60).
2). Further, if priority is designated (step 60)
3) Set the corresponding bit in the priority register 32 (step 604).

When the data decoded by the command decoder 18 is the access completion command from each computer 1 shown in FIG. 7, an interrupt is issued to the microprocessor 20 and the priority exclusive control processing routine shown in FIG. To execute.

In the priority exclusive control processing routine, first, FIG.
The shared data device number, the data area number, and the computer number included in the access completion command shown in (c) are read (step 611), and the flag register 22 and the priority register 32 of the target data area 13 are read based on the information. The bit corresponding to the computer number of is cleared (step 612). After that, it is confirmed whether the other bits of the priority register 32 are set (step 613), and if they are set, the access right shown in FIG. 7B is given to the computer corresponding to the bit of the priority register 32. A permission command is generated and transmitted (steps 614 and 615).

If all the bits of the priority register 32 are not set, whether there is a bit set in order from the bit next to the bit in the flag register 22 that was previously cleared (the bit corresponding to the next computer number). Is confirmed (step 616). If there is a bit set in the flag register 22,
An access right permission command is generated for the computer corresponding to the bit (step 617), and the corresponding computer 1
Then, the access right permission command generated is transmitted (step 618). When all the bits in the flag register 22 are confirmed, and if all the bits are not set (step 619), it is determined that there is no exclusive control request for this data area 13 at this moment, and this data area 13 of the empty flag register 26 is determined. The flag corresponding to is set (step 620).

On the other hand, the main processing routine shown in FIG. 21 is always executed, and in this routine, each data area 13 contained in the empty flag register 26 corresponding to the data area 13 of each shared data device 12.
It is confirmed whether the flag corresponding to is set (step 621). Empty flag register 2
If there is a flag set in 6, the priority register 3 of the data area 13 corresponding to the flag
The presence or absence of the flag set in 2 is checked in order from the least significant bit (step 622). If there is no flag set in the priority register 32, the presence or absence of the flag set in the flag register 22 of the data area 13 corresponding to the flag set next in the empty flag register 26 is checked as the least significant bit. The order is confirmed (step 623).

Here, if there is a flag set in the priority register 32 in step 622 or if there is a flag set in the flag register 22 in step 623, the empty flag register 26 The flag corresponding to the data area 13 is cleared (step 624). Then, the access right permission command is generated and transmitted to the computer 1 corresponding to the bit set in the flag register 22 (step 625). After that, the process returns to step 621, and the confirmation of whether the flag is set in the empty flag register 26 is restarted.

As described above, in this embodiment, since the priority bit is provided, the access right to the data area can be preferentially acquired, and the shared data device can be used in accordance with the processing form of the computer or the processing form of the system. Can access.

In the present embodiment, the description has been given of the configuration in which all the shared data devices 12 are connected to one exclusive control device 44. However, as in the first embodiment, one shared data device is provided to each exclusive control device. A configuration in which devices are connected is also applicable.

Example 7. FIG. 22 is a block diagram of a computer system to which the seventh embodiment of the exclusive control method according to the present invention is applied. Exclusive control device 54 in this system
As an exclusive control request register, when there is an exclusive control request from any of the computers 1 instead of the flag register used in each of the above embodiments, the computer identification number and the task number in the exclusive control request are stored in the data area 13 It is characterized by using a shared data device queue 36 that sequentially stores each of them. Since the other components are the same as those in the second embodiment, description thereof will be omitted.

FIG. 23 shows the formats of various commands used in this embodiment. FIG. 23
23A is an exclusive control request command transmitted from each computer 1 to the exclusive control device 54 in order to make an access right acquisition request for the shared data device 12, and FIG. An access right permission command transmitted from the exclusive control device 54 to permit access to the data area 13 of the data device 12, FIG. 23C shows that each computer 1 that has acquired the access right requests access to the shared data device 12. This is an access completion command for reporting the completion to the exclusive control device 54. A "task number" field for identifying a task that accesses the data area 13 is added to each command format shown in FIG. 7 of the second embodiment.

FIG. 24 is a flowchart of a registration processing routine executed when the exclusive control device 54 receives an exclusive control request command. FIG. 25 is a flowchart of an exclusive control processing routine executed when the exclusive control device 54 receives an access completion command. FIG. 26 is a flowchart of the main processing routine of the exclusive control device 54. The operation of this embodiment will be described with reference to these flowcharts.

First, from each computer 1 to the shared data device 12
23 to obtain the access right of the data area 13 of FIG.
The exclusive control request command shown in (a) is the exclusive control device 5
4 is transmitted as a packet, the priority exclusive control request command is recognized in the same procedure as in the above embodiments, an interrupt is issued to the microprocessor 20, and the registration processing routine shown in FIG. 24 is executed.

In the registration processing routine, first, the shared data device number, data area number, computer number and task number included in the exclusive control request command are read (step 7).
01), the computer number and the task number are sequentially stored for each data area 13 in a queue corresponding to the data area 13 of the target shared data device queue 36 (hereinafter referred to as the data area queue 36) based on the information (01). Step 70
2).

If the data decoded by the command decoder 18 is the access completion command from the computer 1, an interrupt is issued to the microprocessor 20 to asynchronously execute the exclusive control processing routine shown in FIG.

In the exclusive control processing routine, first, the shared data device number, the data area number, the computer number, and the task number included in the access completion command are read (step 711), and the target data area queue 36 is read based on the information. The data pointer of is incremented (step 712). After that, it is confirmed whether or not the incremented data pointer matches the tail pointer of the data area queue 36 (the pointer next to the tail end of the data registered in the queue) (step 713). If they match, it is determined that there is no registered data, that is, there is no computer 1 requesting exclusive control for the data area 13, and the empty flag register 26 corresponding to the target data area 13 is set. (Step 714).
If they do not match, there is registered data, that is, the computer 1 that requests exclusive control for the data area 13
Can be determined to exist, so an access right permission command is generated and transmitted to the target computer based on the registered data in the data area queue 36 indicated by the data pointer (steps 715 and 716).

On the other hand, the main processing routine shown in FIG. 26 is always executed, and in this routine, it is first confirmed whether or not the flags corresponding to the respective data areas 13 included in the empty flag register 26 are set. (Step 721). If there is a flag set in the empty flag register 26, it is confirmed whether or not there is registered data in the data area queue 36 corresponding to the flag (step 722). If there is registered data, it means that the new data has been registered.
The flag in the empty flag register 26 is cleared (step 723). Then, an access right permission command is generated and transmitted to the target computer 1 based on the registration data in the data area queue 36 indicated by the data pointer (step 724). Then step 72
Returning to 1, the confirmation of whether the flag is set in the empty flag register 26 is restarted. If there is no flag set in the empty flag register 26, or if there is no registered data in the data area queue 36, the process returns to step 721.

As described above, in this embodiment, it is possible to perform the exclusive control process for each task of each computer instead of the exclusive control process for each computer. In other words, each computer 1
Multiple exclusive controls can be requested simultaneously for each task.

In the present embodiment, the explanation has been given of the configuration in which all shared data devices 12 are connected to one exclusive control device 54, but one shared data device is provided for each exclusive control device as in the first embodiment. A configuration in which devices are connected is also applicable.

Example 8. FIG. 27 is a block diagram of a computer system to which the eighth embodiment of the exclusive control system according to the present invention is applied. Exclusive control device 64 in this system
In the shared data device queue of the seventh embodiment, a shared data device queue 46 that sequentially stores the storage area 48 of the group number together with the computer identification number and the task number for each data area 13 is used. Further, it is characterized by having a group management table 38 for storing all exclusive control requests included in each group grouped based on this group number and accessible exclusive control requests. Since the other components are the same as those in the seventh embodiment, the description thereof will be omitted.

FIG. 28 shows the formats of various commands used in this embodiment. FIG.
(A) shows a plurality of data areas 13 of the shared data device 12.
Group exclusive control request command transmitted from each computer 1 to the exclusive control device 64 in order to collectively acquire the access right of the shared data device 12 to each computer 1 in FIG. The access right group permission command transmitted from the exclusive control device 54 in order to collectively permit access to the access control unit 13 shown in FIG.
This is a group access completion command for reporting to the exclusive control device 54 that each computer 1 that has acquired the access right in group units has completed the access to the shared data device 12. A "group number" field for further grouping the tasks in the computer 1 is added to each command in this embodiment.

FIG. 29 is a flow chart of a group registration processing routine executed when the exclusion controller 64 receives a group exclusion control request command. Figure 30
6 is a flowchart of a group exclusion control processing routine executed when the exclusion controller 64 receives a group access completion command. FIG. 31 is a flowchart of the main routine of the exclusive control device 64. The operation of this embodiment will be described with reference to these flowcharts.

First, from each computer 1 to the shared data device 12
When the group exclusive control request command shown in FIG. 28A is transmitted as a packet to the exclusive control device 64 in order to acquire the access right to the plurality of data areas 13 of The exclusive control request command is recognized, an interrupt is issued to the microprocessor 20, and the group registration processing routine shown in FIG. 29 is executed.
As is clear from the format of the group exclusive control request command, an exclusive control request can be issued to each data area 13 across different shared data devices 12.

In the group registration processing routine, first, the computer number, task number, group number, shared data device number and data area number included in the group exclusion control request command are read (step 801), and the target group is read based on that information. The group management table 38 is automatically generated (step 802). Also, the data area 1 of the shared data device queue 46 of the target shared data device 12
A computer number, a task number and a group number are sequentially stored for each data area 13 in a queue (hereinafter referred to as a data area queue 46) corresponding to 3 (step 803).

If the data decoded by the command decoder 18 is a group access completion command from each computer 1, an interrupt is issued to the microprocessor 20 to asynchronously execute the group exclusion control processing routine shown in FIG. Run.

In the group exclusion control processing routine, first, the computer number included in the group access completion command,
Read task number and group number (step 81)
1) In addition, the contents of the target group management table 38 are read (step 812), and the data area queue 46 of the target shared data device 12 is read based on such information.
Increments the data pointer (step 81)
3). Then, it is confirmed whether the incremented data pointer matches the tail pointer of the data area queue 46 (step 814). If they match, it means that there is no registered data, so the empty flag register 26 corresponding to the target data area 13
Is set (step 815). If they do not match, it means that there is registration data, so the registration data in the data area queue 46 indicated by the data pointer is read and it is confirmed whether or not a group is designated (step 81).
6). If no group is designated, the access right permission command shown in FIG. 23B is generated and transmitted to the target computer 1 based on the registered data (steps 817, 81).
8). If a group is designated, information that the target data area 13 can be accessed by setting the target bit of the group management table 38 corresponding to the group is held (step 81).
9). Group management table 38 of the target computer 1
In the group registration process, when a group exclusion control request command is received, a bit area corresponding to only the data area 13 requesting exclusion control is automatically generated. Therefore, at this time, all bits of the group management table 38 are set. If so (step 820), the access group right permission command shown in FIG. 28 (b) is transmitted to the computer 1 (step 821).

On the other hand, the main processing routine 4 shown in FIG. 31 is always executed, and in this routine,
First, the process of checking whether the flag corresponding to each data area 13 included in the empty flag register 26 is set and clearing the flag is
Since it is the same as the seventh embodiment (steps 721 to 723), description thereof will be omitted (steps 831 to 833). Here, when there is registered data in the data area queue 46,
The registration data indicated by the data pointer in the target data area 13 is read, and it is confirmed whether or not there is a group designation in the data (step 834). If there is no group designation, the target computer 1 is based on the registration data as shown in FIG.
The access right permission command shown in 3 (b) is transmitted (step 835). If the group is designated, the target bit of the group management table 38 corresponding to the group is set (step 836). At this time, if all the bits of the group management table 38 are set (step 837), the access group right permission command shown in FIG. 28 (b) is transmitted to the computer 1 (step 838). Then, the process returns to step 831 to restart the confirmation of whether the flag is set in the empty flag register 26.

As described above, in the present embodiment, the group management table 38 is further provided in the seventh embodiment so that the group number can be specified, so that a plurality of shared data devices 12 extending from the computer 1 can be provided. It is possible to reduce the load of the computer 1 for the exclusive control request required when performing simultaneous access to the data area 13 and simultaneous rewriting of the respective associated data areas 13.

In the present embodiment, the explanation has been given of the configuration in which all the shared data devices 12 are connected to one exclusive control device 64, but as in the first embodiment, one shared data device is provided for each exclusive control device. A configuration in which devices are connected is also applicable.

Example 9. FIG. 32 is a block diagram of a computer system to which the ninth embodiment of the exclusive control system according to the present invention is applied. Exclusive control device 74 in this system
In the shared data device queue of the seventh embodiment, a shared data device queue 56 that sequentially stores the re-request information storage area 50 for each data area 13 together with the computer identification number and the task number is used. . The re-request information in this embodiment is represented by a re-request designation bit consisting of 1 bit. Since the other components are the same as those in the seventh embodiment, the description thereof will be omitted.

FIG. 33 shows the format of the re-request designation exclusive control request command transmitted from each computer 1 to re-request the access right acquisition of the shared data device 12 used in this embodiment. ing. The information for specifying the re-request is represented by the first 1 bit of the "data area number" field.

FIG. 34 is a flow chart of a re-request registration processing routine executed when the exclusive control device 74 receives a re-request designation exclusive control request command. FIG.
6 is a flowchart of a re-request exclusive control processing routine executed when the exclusive control device 74 receives an access completion command. FIG. 36 is a flowchart of the main routine of the exclusive control device 74. The operation of this embodiment will be described with reference to these flowcharts.

First, from each computer 1 to the shared data device 12
33 to obtain the access right of the data area 13 of FIG.
When the re-request designation exclusive control request command shown in (1) is transmitted to the exclusive control device 74 as a packet, the group exclusive control request command is recognized by the same procedure as in the above embodiments,
An interrupt is issued to the microprocessor 20 to execute the re-request registration processing routine shown in FIG.

In the re-request registration processing routine, first, the computer number, task number, shared data device number and data area number included in the re-request designation exclusive control request command are read (step 901). The data area number includes a re-request designation bit, and based on these pieces of information, the queue corresponding to the data area 13 of the shared data device queue 56 of the target shared data device 12 (hereinafter, data area queue 56 The computer number, the task number, and the re-request designation bit are sequentially stored in each data area 13 (step 902).

If the data decoded by the command decoder 18 is the access completion command from each computer 1, an interrupt is issued to the microprocessor 20 to asynchronously execute the re-request other control processing routine shown in FIG. To run.

In the re-request exclusive control processing routine, first, the computer number, task number, shared data device number and data area number included in the access completion command are read (step 911), and the target sharing is performed based on these information. The data pointer of the data area queue 56 of the data device 12 is incremented (step 912). After that, it is confirmed whether the incremented data pointer matches the tail pointer of the data area queue 56 (step 913). If they match, it means that there is no registered data, and the empty flag register 26 corresponding to the target data area 13 is set (step 914). If they do not match, it means that there is registration data, so the registration data in the data area queue 56 indicated by the data pointer is read, and an access right permission command is generated and transmitted to the target computer 1 (step 915, 916). Here, if the re-request designation bit is set in the registered data in the data area queue 56 indicated by the data pointer (step 91).
7) The registration data is stored by being queued again at the end of the data area queue 56 (step 91).
8).

On the other hand, the main processing routine shown in FIG. 36 is always executed, and in this routine, it is first confirmed whether or not the flag corresponding to each data area 13 included in the empty flag register 26 is set. However, if there is registered data, the processing until the flag is cleared and the access right permission command is transmitted to the target computer 1 is the same as in the seventh embodiment (steps 721 to 7).
24), so the description thereof will be omitted (steps 921 to 921).
924). If the re-request designation bit is set in the registration data in the data area queue 56 indicated by the data pointer (step 925), the registration data is re-queued at the end of the data area queue 56. Is stored (step 926).

As described above, in the present embodiment, when the same data area 13 is regularly accessed from the computer, it is not necessary to transmit the exclusive control request command from the computer 1 each time, and the load on the computer 1 can be reduced. You can In the present embodiment, since the re-request is set when the re-request designation bit is 1, the re-request designated exclusive control request command is appropriately re-set by setting a bit (= 0) for canceling the re-request. Request specifications can be reset.

In the present embodiment, the description has been given of the configuration in which the all shared data device 12 is connected to one exclusive control device 74, but one shared data device is provided for each exclusive control device as in the first embodiment. A configuration in which devices are connected is also applicable. Further, although each of the above-described embodiments has been described only in terms of its characteristic configuration, it can be implemented in any combination with each of the other embodiments.

[0114]

According to the exclusive control system of claim 1,
Each computer can request exclusive control of access to the shared data device in units of data areas. In addition, once the exclusive control request is transmitted, the exclusive control device collectively manages the exclusive control request and performs processing until the access right to the data area of the target shared data device is acquired. Each computer does not need to repeatedly transmit the necessary exclusive control request until the access right can be acquired, and the shared data device does not need to process the exclusive control request. Therefore, it is possible to reduce the load on exclusive control in the entire system and improve the processing capacity.

According to the exclusive control method of claim 2, 1
By providing a single exclusive control device, the same effect as that of the first aspect of the invention can be obtained.

According to the exclusive control system of the third aspect, the register configuration required for exclusive control of the shared data device can be optimized, and the resources used can be minimized. Further, by eliminating the unnecessary flag area in the flag register or the empty flag in advance, the exclusive control request from the computer for the illegal data area can be detected in the exclusive control device.
The load on the shared data device against unauthorized access can be eliminated.

According to the exclusive control method of the fourth aspect, it becomes possible to easily and quickly discard the exclusive control request once accepted. Therefore, it is possible to minimize the influence on the exclusive control processing of another computer, which occurs due to the processing of the unnecessary exclusive control request.

According to the exclusive control method of claim 5, exclusive control requests for a plurality of data areas can be simultaneously made by one exclusive control request, and the throughput of exclusive control requests from the computer can be improved. It will be possible.

According to the exclusive control method described in claim 6, by assigning the preferential execution information from the computer in association with the exclusive control request register, the access right to the data area can be preferentially acquired. The shared data device can be accessed according to the processing form of the computer or the processing form of the system.

According to the exclusive control method described in claim 7, the exclusive control request from each computer is sequentially stored in the exclusive control flag register in order of the computer number and the task number. It is possible to perform exclusive control processing in task units of each computer. That is, each computer can simultaneously request a plurality of exclusive controls.

According to the exclusive control method of the eighth aspect, the group management table 38 is provided so that the group number can be designated, so that simultaneous access to a plurality of data areas from a computer to a plurality of shared data devices can be achieved. It is possible to reduce the load on the computer for the exclusive control request required when performing simultaneous rewriting of the data areas respectively related to each other.

According to the exclusive control method described in claim 9, when the same data area is regularly accessed from the computer, it is not necessary to request the exclusive control from the computer each time. Therefore, the computer in the periodic exclusive control is not required. It is possible to reduce the load of.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a computer system to which a first embodiment of an exclusive control system according to the present invention is applied.

FIG. 2 is a diagram showing formats of various commands used in the first embodiment.

FIG. 3 is a flowchart of a registration processing routine of an exclusive control request in the exclusive control device in the first embodiment.

FIG. 4 is a flowchart of an exclusive control processing routine in the exclusive control device in the first embodiment.

FIG. 5 is a flowchart of a main routine in the exclusive control device in the first embodiment.

FIG. 6 is a configuration diagram of a computer system to which a second embodiment of the exclusive control method according to the present invention is applied.

FIG. 7 is a diagram showing formats of various commands used in the second embodiment.

FIG. 8 is a flowchart of a registration processing routine of an exclusive control request in the exclusive control device in the second embodiment.

FIG. 9 is a flowchart of an exclusive control processing routine in the exclusive control device in the second embodiment.

FIG. 10 is a configuration diagram of a computer system to which a third embodiment of the exclusive control system according to the present invention is applied.

FIG. 11 is a diagram showing formats of various commands used in the third embodiment.

FIG. 12 is a flowchart of an automatic generation processing routine of each register in the exclusive control device in the third embodiment.

FIG. 13 is a diagram showing a format of an exclusive control cancellation request command used in a fourth embodiment of the exclusive control system according to the present invention.

FIG. 14 is a flowchart of a registration cancellation processing routine in the exclusive control device in the fourth embodiment.

FIG. 15 is a diagram showing a format of a multiple data area exclusive control request command used in a fifth embodiment of the exclusive control method according to the present invention.

FIG. 16 is a flowchart of a multiple registration processing routine in the exclusive control device in the fifth embodiment.

FIG. 17 is a configuration diagram of a computer system to which a sixth embodiment of the exclusive control system according to the present invention is applied.

FIG. 18 is a diagram showing a format of a priority exclusive control request command used in the sixth embodiment.

FIG. 19 is a flowchart of a priority registration processing routine of an exclusive control request in the exclusive control device in the sixth embodiment.

FIG. 20 is a flowchart of a priority exclusive control processing routine in the exclusive control device in the sixth embodiment.

FIG. 21 is a flowchart of a main routine in the exclusive control device in the sixth embodiment.

FIG. 22 is a configuration diagram of a computer system to which a seventh embodiment of the exclusive control system according to the present invention is applied.

FIG. 23 is a diagram showing formats of various commands used in the seventh embodiment.

FIG. 24 is a flowchart of an exclusive control request registration processing routine in an exclusive control device in the seventh embodiment.

FIG. 25 is a flowchart of an exclusive control processing routine in the exclusive control device in the seventh embodiment.

FIG. 26 is a flowchart of a main routine in the exclusive control device in the seventh embodiment.

FIG. 27 is a configuration diagram of a computer system to which an eighth embodiment of the exclusive control system according to the present invention is applied.

FIG. 28 is a diagram showing formats of various commands used in the eighth embodiment.

FIG. 29 is a flowchart of an exclusive control request group registration processing routine in the exclusive control device in the eighth embodiment.

FIG. 30 is a flowchart of a group exclusion control processing routine in the exclusion controller in the eighth embodiment.

FIG. 31 is a flowchart of a main routine in the exclusive control device in the eighth embodiment.

FIG. 32 is a configuration diagram of a computer system to which a ninth embodiment of the exclusive control system according to the present invention is applied.

FIG. 33 is a diagram showing a format of a re-request designation exclusive control request command used in the ninth embodiment.

FIG. 34 is a flowchart of a re-request registration processing routine in the exclusive control device in the ninth embodiment.

FIG. 35 is a flowchart of a re-request exclusive control processing routine in the exclusive control device in the ninth embodiment.

FIG. 36 is a flowchart of a main routine in the exclusive control device in the ninth embodiment.

FIG. 37 is a system configuration diagram showing an exclusive control method by a conventional shared memory device.

[Explanation of symbols]

1 computer, 11 switch mechanism, 12, 28 shared data device, 13 data area, 14, 24, 34, 4
4, 54, 64, 74 exclusive control device, 15 transmission lines,
16 node connection interface, 18 command decoder, 20 microprocessor, 22 flag register, 26 empty flag register, 30 data area management area, 32 priority register, 3
6, 46, 56 shared data device queue, 38 group management table, 48 group number storage area, 50
Storage area for reclaim bit.

Claims (9)

[Claims] 1. A plurality of computers, one to a plurality of shared data devices that have a plurality of divided data areas and are accessed in units of data areas from the plurality of computers, and simultaneous access to the shared data devices from each computer. In the exclusive control method in a computer system having one or a plurality of exclusive control devices for eliminating the above, the exclusive control device is a coupling means for connecting a computer or a shared data device to receive various requests and to decode them, and a shared data device. An exclusive control request register that stores the presence / absence of an exclusive control request from each computer in the data area unit, and an empty flag register that stores the presence / absence of the exclusive control request from any computer in the shared data device data area unit, And has exclusive control of access from the computer collectively for each data area of the shared data device. Exclusive control method in a computer system, wherein the door. 2. The exclusive control method in the computer system according to claim 1, wherein the exclusive control device collectively performs exclusive control from the computer for all data areas of all shared data devices connected by the coupling means. An exclusive control method in a computer system characterized by performing. 3. The exclusive control method in the computer system according to claim 1, wherein the exclusive control device receives the data area division information of each shared data device, and the exclusive control request register and the empty flag register. An exclusive control method in a computer system characterized by automatically generating 4. The exclusive control method in the computer system according to claim 1, wherein the exclusive control device, when receiving an exclusive control request discard request from any of the computers, is stored in the exclusive control request register. An exclusive control method in a computer system characterized by canceling an exclusive control request corresponding to a data area of a corresponding shared data device. 5. The exclusive control method in the computer system according to claim 1, wherein the exclusive control device receives a simultaneous exclusive control request for a plurality of data areas from the computer. method. 6. The exclusive control method in the computer system according to claim 1, wherein the exclusive control device is provided corresponding to each of the exclusive control request registers, and is provided in units of data areas of the shared data device from each computer. An exclusive control method in a computer system, comprising a priority register for storing priority execution information of the exclusive control request, and determining a priority order for accessing the computer according to a setting value of the priority register. 7. The exclusive control method in the computer system according to claim 1 or 2, wherein the exclusive control request register is provided with a computer identification number in the exclusive control request when an exclusive control request is issued from any of the computers. An exclusive control method in a computer system characterized by sequentially storing task numbers in data area units. 8. The exclusive control method in the computer system according to claim 7, wherein the exclusive control request register, when an exclusive control request is issued from any of the computers, a computer identification number and a task number in the exclusive control request. And the group numbers are sequentially stored together, and the exclusive control device has a group management table that stores all exclusive control requests included in each group and accessible exclusive control requests, and the exclusive control included in each group An exclusive control method in a computer system in which exclusive control of access in the group is collectively performed in a data area of a shared data device at the same time when all requests become accessible. 9. The exclusive control method in the computer system according to claim 7, wherein the exclusive control request register, when an exclusive control request is issued from any of the computers, a computer identification number and a task number in the exclusive control request. Along with sequentially storing re-request information, the exclusive control device stores the exclusive control request again in the exclusive control request register sequentially when performing access to the exclusive control request accompanied by the re-request. Exclusive control method in computer system.