JPH09293055A - System and method for exclusive control over shared file in loosely coupled multiple computer system, and medium for storing exclusive control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable respective hosts, constituting the loosely coupled multiple computer system, to efficiently and accurately use the shared file. SOLUTION: A shared memory access control means 108 when requested by an application 109 to access the shared memory file 104 performs retrieval from a hash table 107 according to a key specified to make object data to be accessed unique among the hosts, and specifies a data storage block in the shared memory file 104 and a lock area in an inter-host lock area 103. The shared memory access control means 108 after acquiring the lock of the inter- host lock area 103 accesses the corresponding data storage block in the shared memory file 104 and performing unlocking when the access is completed.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exclusive control system for a shared file shared by hosts constituting a loosely coupled multiple computer system, an exclusive control method, and a medium for storing an exclusive control program.

[0001]

In Japanese Patent Laid-Open No. 2-201665, an exclusive control key is generated by using a medium name of a shared volume in which a shared sub-catalog file exists and is registered in a multi-system control unit to be shared sub-catalog file. A technique for performing exclusive control of registration, update, reference, and deletion processing of the above catalog information is described.

[0002]

However, in this conventional technique, exclusive control cannot be performed unless a special device called a multiple system control device used only for registering an exclusive control key is provided. There is a problem.

Further, when the area for registering the exclusive control key in the multiple system controller overflows, the exclusive control cannot be performed.

An object of the present invention is to enable each host constituting a loosely coupled multiple computer system to share a shared file efficiently and accurately.

Another object of the present invention is to enable each host constituting the loosely coupled multiple computer system to exclusively control a shared file for shared use without providing a special device. .

[0006]

According to a first aspect of the present invention, there is provided an exclusive control system for shared files in a loosely coupled multiple computer system in which a plurality of host computers and an application program executed in each of the plurality of host computers access. An external storage device having a shared memory file storing data to be stored, each of the plurality of host computers exclusively controls the shared memory file in response to a data write request from the application program, Shared memory access control means for writing the data to the memory file and canceling the exclusive control of the shared memory file.

The shared file exclusive control system in the second loosely coupled multiple computer system of the present invention is a shared file storing data accessed by a plurality of host computers and application programs executed in each of the plurality of host computers. An external storage device having a memory file, each of the plurality of host computers exclusively controls the shared memory file in response to a data read request from the application program, and is requested from the shared memory file. Shared memory access control means for reading data and canceling exclusive control of the shared memory file.

A third aspect of the present invention is the shared file exclusive control system in the loosely coupled multiple computer system, wherein the external storage device is the shared file exclusive control system in the first loosely coupled multiple computer system. The shared memory access control means includes an inter-host lock area that stores information indicating that memory files are exclusively controlled, and the shared memory access control means stores the shared information in the inter-host lock area in response to a data write request from the application program. Stores information indicating exclusive control of the memory file, writes the data in the shared memory file,
It is characterized in that information for exclusive control of the shared memory file stored in the inter-host lock area is deleted.

According to a fourth aspect of the present invention, there is provided a shared file exclusive control system for a loosely coupled multiple computer system according to the second aspect of the present invention, in the shared file exclusive control system for a loosely coupled multiple computer system. The shared memory access control means includes an inter-host lock area that stores information indicating that memory files are exclusively controlled, and the shared memory access control means stores the shared information in the inter-host lock area in response to a data read request from the application program. Characteristic of storing information for exclusive control of a memory file, reading requested data from the shared memory file, and deleting information for exclusive control of the shared memory file stored in the inter-host lock area And

According to a fifth aspect of the present invention, there is provided a shared file exclusive control system for a shared file in a loosely coupled multiple computer system. In the third shared file exclusive control system for a loosely coupled multiple computer system, the shared memory file is data and the data. A plurality of control blocks that store at least one set of identifiers of
The application program includes a plurality of lock areas for storing information indicating that the control block is locked so as to uniquely correspond to the control block, and the application program specifies data to be written in the shared memory file and an identifier of the data. To the shared memory access control means, the shared memory access control means receives a data write request from the application program, and stores the data identifier specified in the write request. The control block in the file is specified, information indicating that the control block is locked is stored in the lock area in the inter-host lock area corresponding to the control block, and the control file specifies the write request. The control block stored in the lock area. And deletes the information to the effect that locks the click.

According to a sixth aspect of the present invention, there is provided an exclusive control system for shared files in a loosely coupled multiple computer system according to a fourth aspect of the exclusive control system for shared files in a loosely coupled multiple computer system, wherein the shared memory file is data and the data. A plurality of control blocks that store at least one set of identifiers of
The application program includes a plurality of lock areas for storing information indicating that the control block is locked so as to uniquely correspond to the control block, and the application program specifies data to be written in the shared memory file and an identifier of the data. To the shared memory access control means, and the shared memory access control means receives the data read request from the application program, and stores the data identifier specified in the read request. The control block in the file is specified, information for locking the control block in the lock area in the inter-host lock area corresponding to the control block is stored, and the control file specifies the read request. The control data stored in the lock area. And deletes the information to the effect that locks the click.

According to a seventh aspect of the present invention, there is provided an exclusive control system for shared files in a loosely coupled multiple computer system according to the fifth aspect, in the shared file exclusive control system for loosely coupled multiple computer systems, wherein each of the plurality of host computers further comprises: A hash table containing the number of control blocks in the shared memory file and a plurality of control block addresses which are addresses of each control block,
The shared memory access control means receives a data write request from the application program, and divides the result of hashing the identifier of the data specified in the write request by the number of the control blocks stored in the hash table. The information indicating that the control block is to be locked is stored in the remaining lock area in the inter-host lock area, and the residual number stored in the hash table is stored in the hash table. Reading the control block pointed to by the control block address,
If there is an identifier in the control block that matches the identifier of the data specified in the write request, the data corresponding to the identifier is updated with the data specified in the write request. A set of designated data and an identifier of the data is stored in the control block, and information for locking the control block stored in the lock area is deleted.

According to an eighth aspect of the present invention, there is provided an exclusive control system for shared files in a loosely coupled multiple computer system according to the sixth aspect of the shared file exclusive control system in loosely coupled multiple computer systems, wherein each of the plurality of host computers further comprises: A hash table containing the number of control blocks in the shared memory file and a plurality of control block addresses which are addresses of each control block,
The shared memory access control means receives a data read request from the application program, and divides the result of hashing the identifier of the data specified in the read request by the number of the control blocks stored in the hash table. The information indicating that the control block is to be locked is stored in the remaining lock area in the inter-host lock area, and the residual number stored in the hash table is stored in the hash table. Reading the control block pointed to by the control block address,
If there is an identifier in the control block that matches the identifier of the data specified in the read request, the data corresponding to the identifier is read. If there is no matching identifier, an error is displayed and the control stored in the lock area is read. The feature is that the information to lock the block is deleted.

According to a ninth aspect of the present invention, there is provided an exclusive control system for shared files in a loosely coupled multiple computer system, which is the same as the shared file exclusive control system in a seventh loosely coupled multiple computer system. The shared memory access control means further includes a communication device for controlling communication between the plurality of computers, and when the shared memory access control means stores information indicating that the control block is locked by another host computer in the lock area. Waits for the information to be deleted, stores the information indicating that the control block is locked after the deletion, and
When deleting the information for locking the control block stored in the lock area, if there is another computer waiting for the information to be deleted, the The communication device notifies that the information has been deleted.

According to a tenth aspect of the present invention, there is provided a shared file exclusive control system for a shared file in the loosely coupled multiple computer system according to the eighth aspect of the present invention, which is the shared file exclusive control system for a loosely coupled multiple computer system. The shared memory access control means further includes a communication device for controlling communication between the plurality of computers, and when the shared memory access control means stores information indicating that the control block is locked by another host computer in the lock area. Waits for the information to be deleted, stores the information indicating that the control block is locked after the deletion, and
When deleting the information for locking the control block stored in the lock area, if there is another computer waiting for the information to be deleted, the The communication device notifies that the information has been deleted.

A first method of exclusive control of a shared file in a loosely coupled multiple computer system according to the present invention is a shared storage for storing data accessed by a plurality of host computers and an application program executed in each of the plurality of host computers. In a loosely coupled multiple computer system including an external storage device including a memory file, each of the plurality of host computers exclusively controls the shared memory file in response to a data write request from the application program, The data is written in the shared memory file, and the exclusive control of the shared memory file is released.

The shared file exclusive control method in the second loosely coupled multiple computer system of the present invention is a shared file storing data accessed by a plurality of host computers and an application program executed in each of the plurality of host computers. In a loosely coupled multiple computer system including an external storage device including a memory file, each of the plurality of host computers exclusively controls the shared memory file in response to a data read request from the application program, It is characterized in that the requested data is read from the shared memory file and the exclusive control of the shared memory file is released.

According to a third aspect of the present invention, there is provided an exclusive control method for shared files in a loosely coupled multiple computer system, wherein the external storage device further comprises the shared file exclusive control method in the first loosely coupled multiple computer system. An inter-host lock area that stores information indicating that memory files are exclusively controlled is stored, and each of the plurality of host computers stores in the inter-host lock area in response to a data write request from the application program. Information storing exclusive control of a shared memory file is stored, the data is written to the shared memory file, and information storing exclusive control of the shared memory file stored in the inter-host lock area is deleted. To do.

According to a fourth aspect of the present invention, there is provided an exclusive control method for a shared file in a loosely coupled multiple computer system according to the second method for exclusive control of a shared file in a loosely coupled multiple computer system, wherein the external storage device further comprises: The host computer includes an inter-host lock area that stores information indicating that memory files are exclusively controlled, and each of the plurality of host computers stores in the inter-host lock area in response to a data read request from the application program. Information for exclusive control of a shared memory file is stored, requested data is read from the shared memory file, and information for exclusive control of the shared memory file stored in the inter-host lock area is deleted. Characterize.

According to a fifth aspect of the present invention, there is provided an exclusive control method for a shared file in a loosely coupled multiple computer system according to the third method for exclusive control of a shared file in a loosely coupled multiple computer system, wherein the shared memory file is data and the data. A plurality of control blocks that store at least one set of identifiers, and the inter-host lock area stores a plurality of locks that store information indicating that the control blocks are locked in a unique correspondence with the control blocks. Each of the plurality of host computers, including an area, receives a data write request from the application program, and specifies the control block in the shared memory file that stores the identifier of the data specified in the write request. , In the lock area in the inter-host lock area corresponding to the control block, Control information is stored in the control file, the data specified in the write request is written to the control file, and the control block information stored in the lock area is deleted. .

According to a sixth aspect of the present invention, there is provided a shared file exclusive control method for a shared file in a loosely coupled multiple computer system, wherein the shared memory file is data and the data. A plurality of control blocks that store at least one set of identifiers, and the inter-host lock area stores a plurality of locks that store information indicating that the control blocks are locked in a unique correspondence with the control blocks. Each of the plurality of host computers, including an area, receives a data read request from the application program, and specifies the control block in the shared memory file that stores the identifier of the data specified in the read request. , In the lock area in the inter-host lock area corresponding to the control block, It is characterized in that information for locking the control block is stored, the data specified in the read request is read from the control file, and the information for locking the control block stored in the lock area is deleted. .

A seventh aspect of the present invention is a shared file exclusive control method in a loosely coupled multiple computer system, wherein the plurality of host computers further comprises: Including a hash table including the number of the control blocks in the shared memory file and a plurality of control block addresses which are addresses of the control blocks, receiving a data write request from the application program and designating the write request The result obtained by hashing the identifier of the generated data is divided by the number of the control blocks stored in the hash table to obtain a residual, and the control block is stored in the lock area of the residual number in the inter-host lock area. Stores information that locks the The control block indicated by the remaining number of the control block addresses stored in the control block is read, and if there is an identifier in the control block that matches the identifier of the data specified in the write request, the identifier corresponds to the identifier. The data is updated with the data specified in the write request, and if there is no matching identifier, the set of the data specified in the write request and the identifier of the data is stored in the control block and stored in the lock area. It is characterized in that the information indicating that the control block is locked is deleted.

An eighth embodiment of the shared file exclusive control method in the loosely coupled multiple computer system according to the present invention is the shared file exclusive control method in the sixth loosely coupled multiple computer system, wherein each of the plurality of host computers further comprises Including a hash table including the number of the control blocks in the shared memory file and a plurality of control block addresses which are addresses of the control blocks, receiving a data read request from the application program and designating the read request The result obtained by hashing the identifier of the generated data is divided by the number of the control blocks stored in the hash table to obtain a residual, and the control block is stored in the lock area of the residual number in the inter-host lock area. Stores information that locks the The control block indicated by the remaining number of control block addresses stored in the control block is read, and if there is an identifier in the control block that matches the identifier of the data specified in the read request, it corresponds to the identifier. It is characterized in that the data is read, and if there is no matching identifier, an error is displayed and the information for locking the control block stored in the lock area is deleted.

A ninth aspect of the present invention is a shared file exclusive control method for a loosely coupled multiple computer system according to the seventh aspect of the present invention, which is the same as the shared file exclusive control method for a loosely coupled multiple computer system. A case in which a communication device that controls communication between the plurality of computers is included, and each of the plurality of host computers further stores information indicating that the control block is locked by another host computer in the lock area. In the case of waiting for the information to be deleted, storing information indicating that the control block is locked after the deletion, and deleting the information indicating that the control block stored in the lock area is locked, If there is another computer waiting for the information to be deleted, the communication device is sent to the other computer. By and notifies that to remove the information.

According to a tenth aspect of the present invention, there is provided an exclusive control method for shared files in a loosely coupled multiple computer system according to the eighth method for exclusive control of shared files in a loosely coupled multiple computer system. A case in which a communication device that controls communication between the plurality of computers is included, and each of the plurality of host computers further stores information indicating that the control block is locked by another host computer in the lock area. In the case of waiting for the information to be deleted, storing information indicating that the control block is locked after the deletion, and deleting the information indicating that the control block stored in the lock area is locked, If there is another computer waiting for the information to be deleted, the communication with the other computer is performed. And notifies that to remove the information by location.

The first storage medium of the present invention comprises a plurality of host computers and an external storage device including a shared memory file for storing data accessed by an application program executed in each of the plurality of host computers. In the loosely coupled multi-computer system, the shared memory file is exclusively controlled in response to a data write request from the application program, the data is written to the shared memory file, and the exclusive control of the shared memory file is released. And a program for causing each of the plurality of host computers to perform the above.

The second storage medium of the present invention comprises a plurality of host computers and an external storage device including a shared memory file for storing data accessed by an application program executed in each of the plurality of host computers. In the loosely coupled multi-computer system, the shared memory file is exclusively controlled in response to a data read request from the application program, the requested data is read from the shared memory file, and the shared memory file is exclusively controlled. It is characterized by including a program for causing each of the plurality of host computers to perform the cancellation.

According to a third storage medium of the present invention, in the first storage medium, the external storage device further includes an inter-host lock area for storing information indicating that the shared memory file is exclusively controlled. In response to a data write request from the application program, information for exclusive control of the shared memory file is stored in the inter-host lock area, the data is written in the shared memory file, and the inter-host lock area is stored. And a program for causing each of the plurality of host computers to delete the information for exclusive control of the shared memory file stored in.

According to a fourth storage medium of the present invention, in the second storage medium, the external storage device further includes an inter-host lock area for storing information indicating that the shared memory file is exclusively controlled. In response to a data read request from the application program, information about exclusive control of the shared memory file is stored in the inter-host lock area, the requested data is read from the shared memory file, and It is characterized by including a program for causing each of the plurality of host computers to delete the information indicating the exclusive control of the shared memory file stored in the lock area.

A fifth storage medium of the present invention is the third storage medium according to the third storage medium, wherein the shared memory file includes a plurality of control blocks for storing at least one set of data and an identifier of the data. The lock area includes a plurality of lock areas that store information indicating that the control block is locked so as to uniquely correspond to the control block, receives a data write request from the application program, and receives the write request. The control block in the shared memory file that stores the identifier of the designated data is specified, and the information indicating that the control block is locked in the lock area in the inter-host lock area corresponding to the control block is stored. Then, the data specified by the write request is written to the control file, and the control block stored in the lock area is written. Characterized in that it comprises a program for causing each of said plurality of host computers to delete the information that locks the.

According to a sixth storage medium of the present invention, in the fourth storage medium, the shared memory file includes a plurality of control blocks for storing at least one set of data and an identifier of the data, The lock area includes a plurality of lock areas that store information indicating that the control block is locked so as to uniquely correspond to the control block, receives a data read request from the application program, and receives the read request. The control block in the shared memory file that stores the identifier of the designated data is specified, and the information indicating that the control block is locked in the lock area in the inter-host lock area corresponding to the control block is stored. Then, the data specified in the read request is read from the control file, and the control block stored in the lock area is read. Characterized in that it comprises a program for causing to delete the information that locking the click on each of the plurality of host computers.

According to a seventh storage medium of the present invention, in the fifth storage medium, further, a hash including the number of the control blocks in the shared memory file and a plurality of control block addresses which are addresses of the respective control blocks. Including a table, receiving a data write request from the application program, hashing the data identifier specified in the write request, and dividing the result by the number of the control blocks stored in the hash table to obtain a residue. , Storing information indicating that the control block is locked in the remaining number of the lock areas in the inter-host lock area, and the remaining number of the control block addresses stored in the hash table is The control block pointed to is read and the data specified in the write request is written in the control block. If there is an identifier that matches the identifier of the data, the data corresponding to the identifier is updated with the data specified in the write request. If there is no matching identifier, the data specified in the write request and the identifier of the data And a program for causing each of the plurality of host computers to delete the information for locking the control block stored in the lock area.

An eighth storage medium of the present invention is the sixth storage medium, further comprising a hash including the number of the control blocks in the shared memory file and a plurality of control block addresses which are addresses of the control blocks. Including a table, receives a data read request from the application program, obtains a residue obtained by dividing the result of hashing the identifier of the data specified in the read request by the number of the control blocks stored in the hash table. , Storing information indicating that the control block is locked in the remaining number of the lock areas in the inter-host lock area, and the remaining number of the control block addresses stored in the hash table is The control block pointed to is read, and the data specified in the read request is written in the control block. If there is an identifier that matches the identifier of the data, the data corresponding to the identifier is read, and if there is no matching identifier, an error is displayed and the information that locks the control block stored in the lock area is deleted. Is included in each of the plurality of host computers.

A ninth storage medium of the present invention is the seventh storage medium, wherein the loosely coupled multiple computer system further includes a communication device for controlling communication between the plurality of computers, and further, the lock area. If the information indicating that the control block is locked by another host computer is stored in, wait for the information to be deleted, and store the information indicating that the control block is locked after the deletion, When deleting the information for locking the control block stored in the lock area, if there is another computer waiting for the information to be deleted, the It is characterized by including a program for causing each of the plurality of host computers to notify that the information has been deleted by the communication device.

According to a tenth storage medium of the present invention, in the eighth storage medium, the loosely coupled multiple computer system further includes a communication device for controlling communication between the plurality of computers, and further, the lock area. If the information indicating that the control block is locked by another host computer is stored in, wait for the information to be deleted, and store the information indicating that the control block is locked after the deletion, When deleting the information for locking the control block stored in the lock area, if there is another computer waiting for the information to be deleted, the It is characterized by including a program for causing each of the plurality of host computers to notify that the information has been deleted by the communication device.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, according to the present invention, hosts 1 and 2 (101, 102), an extended memory 100 which is a freely readable and writable external storage device shared by the hosts 1 and 2, and the host are provided. The communication device 106 controls the communication between 1 and 2.

The extended memory 100 also includes a shared memory file 104 and an inter-host lock area 103. The hosts 1 and 2 also include an extended memory access control unit 105, a hash table 107, a shared memory access control unit 108, and an application 109.

In the present embodiment, an example in which there are two hosts will be described, but the same operation can be performed even when two or more hosts are connected.

The shared memory file 104 is a file on the expansion memory 100 which stores data exclusively shared between the hosts 1 and 2.

The inter-host lock area 103 is an area for storing lock information for exclusive use in data read processing and data write processing to the shared memory file 104.

The extension memory access means 105 controls reading and writing of data to the extension memory.

The hash table 107 is a table showing a correspondence relationship between the identifier of data registered in the shared memory file 104 and the position of the data and the position of the lock area on the shared memory file 104.

The shared memory access control means 108 exclusively accesses the data in the shared memory file 104 between the hosts based on the request from the application 109.

The application 109 is a general term for user programs and utilities that access data shared between hosts.

FIG. 2 shows the hash table 107, the shared memory file 104, and the inter-host lock area 103.
It is a block diagram which shows the relationship of.

In FIG. 1, the application 109
When registering / referring data to the shared memory file 104, the shared memory access control unit 108
Data to be registered and a data identifier for identifying the data are passed. In FIG. 2, this data identifier is the data identifier 204, and the data is the data 205. Any data identifier may be used, but it is necessary that the data identifier be a common value among the hosts that share the shared memory file 104.

Further, in FIG. 2, the control block n and the lock area n correspond to each other. That is, when the control block address 202 is specified, the corresponding control block 2
03 and the lock area 206 are uniquely determined. In the method of determining the control block address 202, the residual n obtained by dividing the result of hashing the data identifier by the hashing algorithm by the number of control blocks 201 is associated with the control block n address 202.

Next, the operation of the embodiment of the present invention will be described in detail with reference to FIG.

First, the shared memory access control means 108.
Calculates the residual n by hashing the data identifier passed from the application 109 and dividing by the control block number 201 of the hash table 107 (step 30).
1).

Next, the shared memory access control means 108
Is the nth control block n of the hash table 107
The address 202 is taken out (step 302).

Further, the shared memory access control means 10
The extended memory access unit 105 requests the lock area n206 to lock (step 30).
3).

If the lock for the lock area n206 has already been acquired in step 303, the shared memory access control means 108 waits until the lock is released (step 304). Lock area n
When the lock on 206 is successful, the extended memory access unit 105 reads the control block n203 (step 305).

When the access request from the application 109 is data writing, the shared memory access control means 108 reads the control block n2.
03 data identifier 204 is searched in sequence (step 3
07), if there is no identical data identifier designated by the application 109, a new area is secured in the control block n203 (step 308). If the same data identifier is found, the specified data is transferred to the area, and the extended memory access means 1 is also transferred.
The control block n203 is written back to the corresponding location on the shared memory file 104 by 05 (step 309).

If the access request from the application 109 is data read, the shared memory access control means 108 sequentially searches the data identifier 204 of the control block n203 in the same manner as in the case of writing (step 310). If the search fails, an error is returned to the application 109 (step 311). If the search is successful, the corresponding data on the control block n203 is returned to the application 109 (step 312).

After that, the shared memory access control means 10
8 releases the lock on the lock area n206 regardless of the type of access request and whether the access is correct or not (step 313). At this time, when there is a host waiting for the lock to be released due to the lock acquisition failure (step 314), the shared memory access control unit 108 of the host is notified of the lock release using the communication device 106. (Step 315), the process is completed.

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 4, one embodiment of the present invention is
The shared memory file 1 has the same configuration as that of FIG.
A database 404 corresponding to 04 and a database registration / search program 409 corresponding to the application 109 are included.

Next, regarding the operation of one embodiment of the present invention,
This will be described in detail with reference to FIG.

Database registration / search program 409
Shares the database 404 between hosts. The data of the database 404 may be destroyed if it is updated from a plurality of hosts at the same time, and the data being updated may be referred to if the update and reference requests are made at the same time. Therefore, exclusive control of registration and reference is required for each logical data unit.

The operation of the shared memory access control means 108 when the database registration / retrieval program 409 requests registration of data in the database 404 will be described below.

The shared memory access control means 108 receives the data to be registered and the registration key of the data from the database registration / retrieval program.

Next, the shared memory access control means 108
Hash the registration key and divide the result by the number of control blocks on the hash table 107 to obtain the residual n. Then, from the nth control block address on the hash table 107, a control block n for registering data,
The lock area n is specified.

Next, the shared memory access control means 108
Requests the extended memory access unit 105 to write the lock information to the lock area n. At this time, if another piece of lock information is already written in the lock area n, it waits until the lock is released.
This waiting is such that when the access to the corresponding control block of the other host currently acquiring the lock is completed and the lock is released, the lock is acquired again according to the lock release notification notified via the communication device 106. Will try.

When the lock acquisition is successful, the shared memory access control means 108 reads the control block n, and searches the control block n for the entry corresponding to the registration key designated by the database registration / search program 409. To do. Shared memory access control means 108
If the search is successful, the data to be registered is stored in the data part of the entry, and the control block n is written back to the original position on the database 404. After that, the lock information registered in the lock area is deleted, the lock release is notified to the other host waiting for the lock, and the processing completion is reported to the database registration / search program 409.
Complete the process.

The operation when the database registration / retrieval program 409 requests data reference will be described below.

When the shared memory access control means 108 is requested by the database registration / retrieval program 409 to specify a registration key and refer to data, the shared memory access control means 108 sets the control block n and the lock area n in the same procedure as at the time of registration. Specify.

Further, the shared memory access control means 108
Acquires the lock and reads the corresponding control block n in the same procedure as at the time of registration.

The shared memory access control means 108 searches on the read control block n and finds an entry having a key matching the requested registration key. If the key cannot be found, the fact that the data does not exist is returned to the database registration / search program 409, and the lock release procedure is performed. If a matching key is found, the data of the corresponding entry is returned to the database registration / search program 409, and the lock release procedure is performed.

As described above, the processing of the exclusive control system for the shared file in the loosely coupled multiple computer system according to the embodiment of the present invention is completed.

An exclusive control system for shared files in a loosely coupled multiple computer system according to an embodiment of the present invention is
The database registration / search program 409 on the hosts 1 and 2 has the effect of being able to access the database 404 accurately without recognizing that the database 404 is shared between the hosts.

The shared file exclusive control program in the loosely coupled multiple computer system according to another embodiment of the present invention can perform the same processing as the shared file exclusive control system described above. ,
Memory, disk, floppy disk, and CD-
It can be stored in a storage medium such as a ROM.

[0072]

As described above, the shared file exclusive control system, the exclusive control method, and the medium for storing the exclusive control program in the loosely coupled multiple computer system according to the present invention constitute the loosely coupled multiple computer system. The host has an effect that the shared file can be exclusively controlled and shared without having a special device. Therefore, each host that constitutes the loosely coupled multi-computer system has the effect of sharing the shared file efficiently and accurately.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a shared file exclusive control system in a loosely coupled multiple computer system in the loosely coupled multiple computer system according to the present invention.

FIG. 2 is a hash table 10 shown in FIG.
7 is a block diagram showing the relationship among the shared memory file 104, the shared memory file 104, and the inter-host lock area 103. FIG.

FIG. 3 is a flowchart showing a process of a shared memory access control unit 108 according to the embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a shared file exclusive control system in the loosely coupled multiple computer system in the loosely coupled multiple computer system according to an embodiment of the present invention.

[Explanation of symbols]

 100 shared memory 101 host computer 1 102 host computer 2 103 inter-host lock area 104 shared memory file 105 extended memory access means 106 communication device 107 hash table 108 shared memory access control means 109 application 201 control block number 202 control block 1 to n address 203 control block 1-n 204 data identifier 205 data 206 lock area 1-n 404 database 409 database registration / search program

Claims (30)

[Claims] 1. A host computer, comprising: a plurality of host computers; and an external storage device having a shared memory file for storing data accessed by an application program executed in each of the plurality of host computers, each of the plurality of host computers. A shared memory access control unit for exclusively controlling the shared memory file, writing the data to the shared memory file, and canceling the exclusive control of the shared memory file in response to a data write request from the application program. An exclusive control system for shared files in a loosely coupled multi-computer system characterized by including the following. 2. A host computer, comprising: a plurality of host computers; and an external storage device having a shared memory file storing data accessed by an application program executed in each of the plurality of host computers, each of the plurality of host computers. Shared memory access control for exclusive control of the shared memory file in response to a data read request from the application program, reading requested data from the shared memory file, and canceling exclusive control of the shared memory file. An exclusive control system for shared files in a loosely coupled multiple computer system characterized by including means. 3. An exclusive control system for shared files in a loosely coupled multiple computer system according to claim 1, wherein the external storage device further stores information indicating that exclusive control of the shared memory files is performed. Including a lock area, the shared memory access control means, in response to a data write request from the application program,
Information indicating that the shared memory file is exclusively controlled in the inter-host lock area, the data is written in the shared memory file, and the shared memory file stored in the inter-host lock area is exclusively controlled. An exclusive control system for shared files in a loosely coupled multi-computer system, which is characterized by deleting files. 4. The exclusive control system for shared files in a loosely coupled multiple computer system according to claim 2, wherein the external storage device further stores information indicating that exclusive control is performed on the shared memory files. Including a lock area, the shared memory access control means, in response to a data read request from the application program,
Information for exclusive control of the shared memory file is stored in the inter-host lock area, requested data is read from the shared memory file, and the shared memory file stored in the inter-host lock area is exclusively controlled. An exclusive control system for shared files in a loosely coupled multi-computer system characterized by deleting the information of 5. The exclusive control system for a shared file in a loosely coupled multiple computer system according to claim 3, wherein the shared memory file includes a plurality of control blocks that store at least one set of data and an identifier of the data. The inter-host lock area includes a plurality of lock areas that store information indicating that the control block is locked so as to uniquely correspond to the control block, and the application program stores data to be written in the shared memory file. And a data write request that specifies the identifier of the data to the shared memory access control unit, and the shared memory access control unit receives the data write request from the application program and receives the data specified in the write request. The shared memory file storing the identifier of It identifies the control block,
Information for locking the control block is stored in the lock area in the inter-host lock area corresponding to the control block, the data specified in the write request is written to the control file, and stored in the lock area. An exclusive control system for a shared file in a loosely coupled multiple computer system, characterized in that the information to lock the control block is deleted. 6. The exclusive control system for a shared file in a loosely coupled multiple computer system according to claim 4, wherein the shared memory file includes a plurality of control blocks for storing at least one set of data and an identifier of the data. The inter-host lock area includes a plurality of lock areas that store information indicating that the control block is locked so as to uniquely correspond to the control block, and the application program stores data to be written in the shared memory file. And a data read request that specifies the identifier of the data to the shared memory access control unit, and the shared memory access control unit receives the data read request from the application program and receives the data designated in the read request. The shared memory file storing the identifier of It identifies the control block,
Information for locking the control block is stored in the lock area in the inter-host lock area corresponding to the control block, the data specified in the read request is read from the control file, and stored in the lock area. An exclusive control system for a shared file in a loosely coupled multiple computer system, characterized in that the information to lock the control block is deleted. 7. The shared file exclusive control system in the loosely coupled multiple computer system according to claim 5, wherein each of the plurality of host computers further includes the number of the control blocks and each control block in the shared memory file. And a hash table containing a plurality of control block addresses which are addresses of the shared memory access control means, wherein the shared memory access control means receives a data write request from the application program and hashes the identifier of the data specified in the write request. The result is divided by the number of the control blocks stored in the hash table to obtain a residual, and information indicating that the control block is locked is stored in the remaining number of lock areas in the inter-host lock area. And the number of the residuals stored in the hash table Read the control block pointed to by the th th control block address,
If there is an identifier in the control block that matches the identifier of the data specified in the write request, the data corresponding to the identifier is updated with the data specified in the write request. A loosely coupled multi-computer system characterized in that a set of designated data and an identifier of the data is stored in the control block, and the information for locking the control block stored in the lock area is deleted. Exclusive control system for shared files. 8. The exclusive control system for shared files in a loosely coupled multiple computer system according to claim 6, wherein each of the plurality of host computers further includes the number of control blocks and each control block in the shared memory file. The shared memory access control means receives a data read request from the application program and hashes the data identifier specified in the read request. The result is divided by the number of the control blocks stored in the hash table to obtain a residual, and information indicating that the control block is locked is stored in the remaining number of lock areas in the inter-host lock area. And the number of the residuals stored in the hash table Read the control block pointed to by the th th control block address,
If there is an identifier in the control block that matches the identifier of the data specified in the read request, the data corresponding to the identifier is read. If there is no matching identifier, an error is displayed and the control stored in the lock area is read. An exclusive control system for shared files in a loosely coupled multi-computer system characterized by deleting information indicating that a block is locked. 9. The exclusive control system for shared files in a loosely coupled multiple computer system according to claim 7, wherein the loosely coupled multiple computer system further includes a communication device for controlling communication between the plurality of computers, The shared memory access control means further waits until the information is deleted when the information indicating that the control block is locked by another host computer is stored in the lock area, and then executes the control after the deletion. There is another computer that stores the information to lock the block and waits until the information is deleted when deleting the information to lock the control block stored in the lock area. In this case, the loosely coupled multiple calculation characterized in that the communication device notifies the other computer that the information has been deleted. Exclusive control system of the shared file in the system. 10. The exclusive control system for shared files in a loosely coupled multiple computer system according to claim 8, wherein the loosely coupled multiple computer system further includes a communication device for controlling communication between the plurality of computers, The shared memory access control means further waits until the information is deleted when the information indicating that the control block is locked by another host computer is stored in the lock area, and then executes the control after the deletion. There is another computer that stores the information to lock the block and waits until the information is deleted when deleting the information to lock the control block stored in the lock area. In this case, the loosely coupled multiplexer, which notifies the other computer that the information has been deleted by the communication device. Exclusive control system of the shared file in the machine system. 11. A loosely coupled multiple computer system comprising a plurality of host computers and an external storage device including a shared memory file storing data accessed by an application program executed in each of the plurality of host computers, Each of the plurality of host computers exclusively controls the shared memory file in response to a data write request from the application program, writes the data to the shared memory file, and releases the exclusive control of the shared memory file. An exclusive control method for shared files in a loosely coupled multiple computer system. 12. A loosely coupled multi-computer system comprising a plurality of host computers and an external storage device including a shared memory file storing data accessed by an application program executed in each of the plurality of host computers, Each of the plurality of host computers exclusively controls the shared memory file in response to a data read request from the application program, reads the requested data from the shared memory file, and exclusively controls the shared memory file. A method for exclusive control of shared files in a loosely coupled multiple computer system, which is characterized by releasing. 13. The exclusive control method for a shared file in a loosely coupled multiple computer system according to claim 11, wherein the external storage device further stores information indicating that the shared memory file is exclusively controlled. Each of the plurality of host computers, including a lock area, stores information indicating that the shared memory file is exclusively controlled in the inter-host lock area in response to a data write request from the application program, and the shared An exclusive control method for a shared file in a loosely coupled multi-computer system, characterized in that the data is written in a memory file and information for exclusive control of the shared memory file stored in the inter-host lock area is deleted. 14. The shared file exclusive control method for a loosely coupled multiple computer system according to claim 12, wherein the external storage device further stores information indicating that the shared memory file is exclusively controlled. Each of the plurality of host computers, including a lock area, stores information indicating exclusive control of the shared memory file in the inter-host lock area in response to a data read request from the application program, and the shared A method for exclusive control of a shared file in a loosely coupled multi-computer system, characterized in that requested data is read from a memory file and information for exclusive control of the shared memory file stored in the inter-host lock area is deleted. 15. The exclusive control method for a shared file in a loosely coupled multiple computer system according to claim 13, wherein the shared memory file includes a plurality of control blocks storing at least one set of data and an identifier of the data. The inter-host lock area includes a plurality of lock areas that store information indicating that the control block is locked so as to uniquely correspond to the control block, and each of the plurality of host computers includes the application program. Receiving a data write request from the shared memory file, storing the identifier of the data specified in the write request, specifying the control block in the shared memory file, and locking the lock in the inter-host lock area corresponding to the control block. The information that locks the control block is stored in the area, and the control file stores the information. Writes the specified in the request write attempts data, exclusive control method for sharing files in a loosely coupled multi-computer system and deletes the information to the effect that locks the control blocks stored in the lock area. 16. The shared file exclusive control method for a loosely coupled multiple computer system according to claim 14, wherein the shared memory file includes a plurality of control blocks for storing at least one set of data and an identifier of the data. The inter-host lock area includes a plurality of lock areas that store information indicating that the control block is locked so as to uniquely correspond to the control block, and each of the plurality of host computers includes the application program. Receiving a data read request from the shared memory file, storing the identifier of the data specified in the read request, identifying the control block in the shared memory file, and locking the lock in the inter-host lock area corresponding to the control block. The information that locks the control block is stored in the area, and is stored from the control file. Reads the data specified in the read request, the exclusive control method for sharing files in a loosely coupled multi-computer system and deletes the information to the effect that locks the control blocks stored in the lock area. 17. The exclusive control method for a shared file in a loosely coupled multiple computer system according to claim 15, wherein each of the plurality of host computers further includes the number of the control blocks and each control block in the shared memory file. A hash table including a plurality of control block addresses, which are addresses of data, and a result of hashing the identifier of the data designated in the write request when the data write request is received from the application program is stored in the hash table. The remainder obtained by dividing by the number of the control blocks is stored, the information indicating that the control block is locked in the lock area of the number of the remainder in the inter-host lock area is stored, and stored in the hash table. The remaining number of the control block addresses Read the control block, and if there is an identifier in the control block that matches the identifier of the data specified in the write request,
The data corresponding to the identifier is updated with the data specified in the write request, and if there is no matching identifier, the set of the data specified in the write request and the identifier of the data is stored in the control block, and An exclusive control method of a shared file in a loosely coupled multi-computer system, characterized in that information indicating that the control block stored in the lock area is locked is deleted. 18. The exclusive control method for a shared file in a loosely coupled multiple computer system according to claim 16, wherein each of the plurality of host computers further includes the number of the control blocks and each control block in the shared memory file. And a hash table including a plurality of control block addresses that are addresses of the control program, the result of hashing the identifier of the data specified in the read request is stored in the hash table. The remainder obtained by dividing by the number of the control blocks is stored, the information indicating that the control block is locked in the lock area of the number of the remainder in the inter-host lock area is stored, and stored in the hash table. The remaining number of the control block addresses Read the control block, and if there is an identifier in the control block that matches the identifier of the data specified in the read request,
Sharing in a loosely coupled multi-computer system characterized in that data corresponding to the identifier is read, and if there is no matching identifier, an error is displayed and the information for locking the control block stored in the lock area is deleted. File exclusive control method. 19. The shared file exclusive control method for a loosely coupled multiple computer system according to claim 17, wherein the loosely coupled multiple computer system further includes a communication device for controlling communication between the plurality of computers, Further, each of the plurality of host computers further waits until the information is deleted when the information indicating that the control block is locked by another host computer is stored in the lock area, and after the deletion, the information is deleted. There is another computer that stores the information indicating that the control block is locked and that waits for the information to be deleted when the information indicating that the control block that is stored in the lock area is deleted. In the case of doing so, the loosely-coupled multiplexer, which notifies the other computer that the information has been deleted by the communication device Exclusive control method for shared files in computer systems. 20. The exclusive control method for shared files in a loosely coupled multiple computer system according to claim 18, wherein the loosely coupled multiple computer system further includes a communication device for controlling communication between the plurality of computers, Further, each of the plurality of host computers further waits until the information is deleted when the information indicating that the control block is locked by another host computer is stored in the lock area, and after the deletion, the information is deleted. There is another computer that stores the information indicating that the control block is locked and that waits for the information to be deleted when the information indicating that the control block that is stored in the lock area is deleted. In the case of doing so, the loosely-coupled multiplexer, which notifies the other computer that the information has been deleted by the communication device Exclusive control method for shared files in computer systems. 21. A loosely coupled multiple computer system comprising a plurality of host computers and an external storage device including a shared memory file storing data accessed by an application program executed in each of the plurality of host computers, In response to a data write request from the application program, the shared memory file is exclusively controlled, the data is written to the shared memory file, and the exclusive control of the shared memory file is released. A storage medium including a program to be executed by each. 22. A loosely coupled multi-computer system comprising a plurality of host computers and an external storage device including a shared memory file storing data accessed by an application program executed in each of the plurality of host computers, In response to a data read request from the application program, the shared memory file is exclusively controlled, the requested data is read from the shared memory file, and the exclusive control of the shared memory file is released. A storage medium including a program to be executed by each computer. 23. The storage medium according to claim 21, wherein the external storage device further includes an inter-host lock area that stores information indicating that the shared memory file is exclusively controlled, In response to a data write request, information about exclusive control of the shared memory file is stored in the inter-host lock area, the data is written in the shared memory file, and the shared memory stored in the inter-host lock area. A storage medium including a program that causes each of the plurality of host computers to delete information indicating that files are exclusively controlled. 24. The storage medium according to claim 22, wherein the external storage device further includes an inter-host lock area that stores information indicating that the shared memory file is exclusively controlled. In response to a data read request, information about exclusive control of the shared memory file is stored in the inter-host lock area, the requested data is read from the shared memory file, and stored in the inter-host lock area. A storage medium including a program that causes each of the plurality of host computers to delete information indicating that exclusive control of a shared memory file is to be performed. 25. The storage medium according to claim 23, wherein the shared memory file includes a plurality of control blocks that store at least one set of data and an identifier of the data, and the inter-host lock area is the control area. An identifier of the data specified in the write request, including a plurality of lock areas that store information indicating that the control block is locked uniquely corresponding to the block, and receiving a data write request from the application program Is specified, the control block in the shared memory file is stored, information that locks the control block in the lock area in the inter-host lock area corresponding to the control block is stored, and the control file is stored in the control file. Write the data specified in the write request and lock the control block stored in the lock area. A storage medium including a program for causing each of the plurality of host computers to delete the information indicating that the storage medium is deleted. 26. The storage medium according to claim 24, wherein the shared memory file includes a plurality of control blocks that store at least one set of data and an identifier of the data, and the inter-host lock area is the control block. An identifier of the data designated by the read request, including a plurality of lock areas storing information indicating that the control block is locked uniquely corresponding to the block, and receiving a data read request from the application program Is specified, the control block in the shared memory file is stored, and information for locking the control block in the lock area in the inter-host lock area corresponding to the control block is stored, Read the data specified in the read request and lock the control block stored in the lock area A storage medium including a program for causing each of the plurality of host computers to delete the information indicating that the storage medium is deleted. 27. The storage medium according to claim 25, further comprising a hash table including the number of the control blocks in the shared memory file and a plurality of control block addresses which are addresses of each control block, Upon receiving a data write request from a program, the result obtained by hashing the identifier of the data specified in the write request is divided by the number of the control blocks stored in the hash table to obtain a residual, and the inter-host lock area is obtained. Storing information indicating that the control block is locked in the remaining number of lock areas in the control block, and reading the control block indicated by the remaining number of control block addresses stored in the hash table. , The identifier of the data specified in the write request in the control block If there is an identifier that matches
The data corresponding to the identifier is updated with the data specified in the write request, and if there is no matching identifier, the set of the data specified in the write request and the identifier of the data is stored in the control block, and A storage medium including a program for causing each of the plurality of host computers to delete the information indicating that the control block is stored and stored in the lock area. 28. The storage medium according to claim 26, further comprising a hash table including the number of the control blocks in the shared memory file and a plurality of control block addresses which are addresses of each control block, Upon receiving a data read request from a program, a result obtained by hashing the identifier of the data designated in the read request is divided by the number of the control blocks stored in the hash table to obtain a residual, and the inter-host lock area is obtained. Storing information indicating that the control block is locked in the remaining number of lock areas in the control block, and reading the control block indicated by the remaining number of control block addresses stored in the hash table. , The identifier of the data specified in the read request in the control block If there is an identifier that matches
The data corresponding to the identifier is read, and if there is no matching identifier, an error is displayed and each of the plurality of host computers is made to delete the information for locking the control block stored in the lock area. A storage medium containing a program. 29. The storage medium according to claim 27, wherein the loosely-coupled multiple computer system further includes a communication device that controls communication between the plurality of computers, and the lock area is controlled by another host computer. When the information indicating that the control block is locked is stored, the information is waited for to be deleted, the information indicating that the control block is locked after the deletion is stored, and the information is stored in the lock area. When deleting the information for locking the control block, if there is another computer waiting for the information to be deleted, the information is sent to the other computer by the communication device. A storage medium including a program that causes each of the plurality of host computers to notify that the host computer has been deleted. 30. The storage medium according to claim 28, wherein the loosely-coupled multiple computer system further includes a communication device that controls communication between the plurality of computers, and the lock area is controlled by another host computer. When the information indicating that the control block is locked is stored, the information is waited for to be deleted, the information indicating that the control block is locked after the deletion is stored, and the information is stored in the lock area. When deleting the information for locking the control block, if there is another computer waiting for the information to be deleted, the information is sent to the other computer by the communication device. A storage medium including a program that causes each of the plurality of host computers to notify that the host computer has been deleted.