JP3918641B2 - Exclusive control method and exclusive control system for shared resources - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exclusive control method and an exclusive control system for a shared resource in a computer system, and more particularly to determining whether or not to perform exclusion in a data access process and determining whether or not to perform exclusion. The exclusive control method and the exclusive control system of the shared resource for shortening the exclusive section.
[0002]
[Prior art]
Conventionally, in a data processing system such as a computer, a single resource is shared by a program that can request access to the resource. When access requests are issued from multiple programs at the same time, in general, a shared resource is excluded so that another program cannot access the shared resource while one program is accessing the shared resource. Access is made in order. FIG. 14 shows a block diagram of a conventional exclusive control system for shared resources. As shown in FIG. 14, a conventional shared resource exclusion control system includes a data access unit 52 that processes a data access request from a program 51, and a shared resource exclusion unit that processes an exclusion request and an exclusion release request from the program 51. 53.
[0003]
Prior to data access, the program 51 requests exclusion of the shared resource using the shared resource exclusion unit 53, and if the exclusion is successful, performs data access using the data access unit 52. When data access such as data reference or update is completed, the program 51 uses the shared resource exclusion unit 53 to release the shared resource. Further, when the program 51 accesses data in a plurality of shared resources such as data l, m, and n, for example, if the shared resource is excluded every time the data is accessed, the overhead associated with these operations Therefore, prior to data access to data l, m, and n, exclusion of shared resources in which the data is stored is executed collectively, and data access of data l, m, and n is performed. When all the processes are completed, the exclusive release of these shared resources is executed.
[0004]
[Problems to be solved by the invention]
In the conventional technology described above, prior to accessing a plurality of data, the shared resources in which these data are stored are excluded. However, all of these shared resources need to exclude access by other programs. It is not necessarily a shared resource. Since shared resources have a finite limit on the number of concurrent accesses to the shared resource itself, there is no limit on the number of concurrent accesses to the shared resource itself and the number of concurrent accesses to the shared resource itself. There are shared resources whose number of concurrent executions is not limited. The former is a shared resource that requires exclusion upon access (hereinafter referred to as “exclusive resource”), and the latter is a shared resource that does not require exclusion (hereinafter referred to as “exclusive resource”). is there. The former representative is a file, and the latter representative is a memory. In the case of a file, since the upper limit of the number of processes that can be accessed simultaneously by the system is set, exclusion is necessary. In the case of a memory, since there is no such upper limit, exclusion is not necessary.
[0005]
In FIG. 14, when all the data accessed by the program 51 is data l, m, n in the exclusive required resources, the shared resources (exclusive required resources) are accessed while the data l, m, n are accessed. ) Must be exclusive. However, when the data accessed by the program 51 is, for example, the data l ′ and m ′ in the resource that does not require exclusion and the data n in the resource that requires exclusion, only when accessing the data n. Exclusion is sufficient, and while the data l ′, m ′, and n are being accessed, if the exclusion is performed, the exclusive section becomes unnecessarily long.
[0006]
The present invention has been made in view of these problems, and it is an object of the present invention to determine whether a shared resource storing the data is an exclusive required resource or an exclusive unnecessary resource when the program accesses the data. Without considering the program side, in the data access process, by determining the exclusion required resource and the exclusion unnecessary resource, decide whether to perform exclusion, shorten the shared resource exclusion section, between the programs An object of the present invention is to provide an exclusive control method and an exclusive control system for shared resources that reduce waiting due to exclusion.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, an exclusive request, an exclusive release request and a data access request from a program are input to perform an exclusive process, an exclusive release process and a data access process of the shared resource. In the control method, in response to an exclusion request from the program, the exclusion of shared resources is not performed, but exclusion success is returned to the program, and the exclusion process is performed when the data access requested data Based on the storage location of the data Is not in the case of data in a shared resource that does not require exclusion, Said There is provided an exclusive control method for a shared resource, wherein the exclusion is performed when the data is data in a shared resource that requires exclusion.
[0008]
In order to achieve the above object, according to the present invention, a shared resource that performs exclusive processing, exclusive release processing, and data access processing of a shared resource by inputting an exclusive request, an exclusive release request, and a data access request from a program. In this exclusive control method, a shared resource is not excluded in response to an exclusion request from the program, and the exclusion success is returned to the program. Data to be accessed when Storage location The exclusion request is requested continuously without requiring an exclusion release request in the middle, and / or the exclusion request is requested in the middle of the exclusion request. When the request is made continuously, when the request is other than the first request among the plurality of exclusive requests and / or exclusive release requests, exclusive failure or / and exclusive release failure is returned to the program, and processing for the request is performed. There is provided an exclusive control method for a shared resource, characterized by being terminated.
[0009]
In order to achieve the above object, according to the present invention, an exclusive request, an exclusive release request, and a data access request from one or a plurality of programs that can operate simultaneously are input, and an exclusive process and an exclusive release of a shared resource are performed. A method for exclusive control of a shared resource that performs processing and data access processing, and in response to an exclusion request from the program, the exclusion of the shared resource is not performed, and the exclusion success is returned to the program, and exclusion is necessary / unnecessary Is the data to be accessed when data access is requested by the program Storage location And a process management table that records an exclusive state for each process in which each program operates, and the exclusive state is changed with reference to the process management table. Exclusive control method, proposed
Provided.
[0010]
In order to achieve the above object, according to the present invention, there is provided an exclusive control system that executes the shared resource exclusive control method.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is a block diagram of a shared resource exclusive control system according to the first embodiment of the present invention. As shown in FIG. 1, the shared resource exclusive control system according to the present embodiment processes data access means 12 that processes data access requests from the program 11, and exclusive requests and exclusive release requests from the program 11. Shared resource exclusion means 13. The functions of the data access unit 12 and the shared resource exclusion unit 13 are as follows.
The shared resource exclusion means 13 has a process management table 14. In the process management table 14, a process number is provided for each process in which the program 11 operates, and each process number has two columns, a temporary exclusive state 15 and a real exclusive state 16. The temporary exclusion state 15 and the actual exclusion state 16 can take either exclusion or exclusion. The temporary exclusive state 15 and the actual exclusive state 16 are not exclusive when the process corresponding to the process number is not in any data access operation state, and are in an exclusive request, data access request, or exclusive release request state. It changes according to the state. Therefore, the temporary exclusion state 15 and the actual exclusion state 16 represent the state of each process in which the program 11 operates, and do not indicate which shared resource (exclusion required resource) is excluded.
[0012]
When the shared resource exclusion means 13 (1) issues a shared resource exclusion request prior to data access from the program 11, (2) the process number corresponding to the process management table 14 for each process in which the program 11 operates. The temporary exclusion state 15 is updated to provisional exclusion, and (3) the exclusion success is returned to the program 11 without actually performing exclusion of the shared resource. At this point, no action has been added to the shared resource. The shared resource exclusion means 13 also (6) if there is a real exclusion request from the data access means 12, (7) sets the real exclusion state 16 of the corresponding process number in the process management table 14 for each process in which the program 11 operates. Refer to (8) if the shared resource (exclusion required resource) is not exclusive from the process of another program or other process of the own program (hereinafter collectively referred to as "other process") The exclusive resource is excluded from that process, and if the exclusive resource is locked from another process, the process waits for the exclusion from the other process to release the exclusive resource from that process. (9) When the exclusion process is completed, the real exclusion state 16 of the corresponding process number in the process management table 14 is updated to the real exclusion completed for each process in which the program 11 operates, (10) The exclusion success is returned to the data access means 12. The shared resource exclusion means 13 further, (12) if there is an exclusion release request from the program 11, (13) the temporary exclusion state 15 and the actual exclusion of the corresponding process number in the process management table 14 for each process in which the program 11 operates. The state 16 is set as temporary exclusion not yet actual exclusion, respectively (14) The exclusion of the shared resource is released. In the above step (8), if the real exclusion state 16 of the process management table 14 has been actually excluded in response to the real exclusion request, the shared resource exclusion unit 13 does not perform the exclusion process and sends it to the data access unit 12. Returns exclusion success.
[0013]
The data access means 12 (3) when exclusion success is returned from the shared resource exclusion means 13 to the program 11 and (4) data access is requested from the program 11, the data to be accessed is included in the exclusion required resource. (5) If the access target is in the exclusion-unnecessary resource, without making an actual exclusion request to the shared resource exclusion means 13, the data in the exclusion-unnecessary resource is determined. Access is performed. (6) If the access target is in the exclusive resource, an actual exclusive request is made to the shared resource exclusive means 13. When the exclusion success is returned from (10) the shared resource exclusion unit 13, the data access unit 12 (11) accesses the data in the exclusion required resource.
[0014]
In this way, in the program 11, the data access means 12 actually performs data access without changing the conventional processing of requesting exclusion of shared resources, accessing data, and releasing exclusion of shared resources. When performing the exclusion, it is possible to shorten the exclusion section by performing exclusion of only the resources requiring exclusion.
[0015]
FIG. 2 is a flowchart for explaining processing operations of the data access unit 12 and the shared resource exclusion unit 13 of FIG. The overall operation of the shared resource exclusive control method according to this embodiment will be described with reference to the flowchart of FIG.
f11: An exclusive request is issued from the program 11 to the shared resource exclusion means 13, and the shared resource exclusion means 13 performs temporary exclusion processing.
f120: When the exclusion success is returned from the shared resource exclusion means 13 to the program 11, one or more data access requests are issued from the program 11 to the data access means 12, and the data access means 12 requests from the program 11. The received data access requests are sequentially executed.
f121: The program 11 determines whether all data access requests are completed. If completed, the process proceeds to f15 to perform the exclusion release process. If not completed, the process proceeds to f122.
f122: The data access means determines whether or not the resource accommodating the requested data is an exclusive resource. If it is not an exclusive resource, the process proceeds to step f123, and if it is an exclusive resource, the process proceeds to step f124.
f123: The data access means 12 accesses the access target data in the resource not requiring exclusion without making a real exclusion request, and returns to step f121. f124: The data access means 12 outputs a real exclusion request to the shared resource exclusion means 13.
f13: The shared resource exclusion unit 13 performs exclusion of the exclusion required resource, and returns exclusion success to the data access unit 12.
f14: The data access means 12 accesses the data in the exclusive exclusion required resource in view of the exclusion success returned from the shared resource exclusion means 13.
Step f121 to step f14 are repeated for all data access requests. When all the data access requests are completed, an exclusion release request is issued from the program 11, and the process proceeds to step f15.
f15: The exclusive resource exclusion means 13 performs exclusive release processing for the exclusive resource.
[0016]
Next, the operation of the temporary exclusion flow (step f11) in FIG. 2 will be described in detail with reference to the flowchart in FIG.
First, as usual, the program 11 issues an exclusion request to the shared resource exclusion means 13.
f110: The shared resource exclusion means 13 determines whether or not the provisional exclusion state 15 of the process number in the process management table 14 corresponding to the acquired exclusion request process is provisionally excluded. If it is not provisionally exclusive, the process proceeds to step f111. If it is provisionally exclusive, the process proceeds to step f113.
f111: The shared resource exclusion unit 13 updates the provisional exclusion state 15 to provisional exclusion. f112: The exclusion success is returned from the shared resource exclusion means 13 to the program 11.
f113: The exclusion failure is returned from the shared resource exclusion means 13 to the program 11.
[0017]
If the program 11 mistakenly makes an exclusive request to the shared resource exclusion means 13 twice in succession, the temporary exclusion state 15 is temporarily excluded at the time of the second exclusion request. In this case, the process of the second exclusion request is terminated at step f113. The first exclusion request proceeds to steps after step f111. As described above, by recording the temporary exclusion state of the process in the process management table 14, an operation due to an erroneous exclusion request is prevented.
[0018]
When the exclusion success is returned from the shared resource exclusion means 13, the program 11 issues one or more data access requests as usual.
Next, the operation of the actual exclusive flow (step f13) in FIG. 2 will be described in detail with reference to the flowchart in FIG.
f130: The shared resource exclusion means 13 determines whether or not the actual exclusion state 16 of the process number in the process management table 14 corresponding to the process of the actual exclusion request has been actually excluded. When the real exclusion state 16 is the real exclusion, the process proceeds to step f135, and when the real exclusion state 16 is not the actual exclusion, the process proceeds to step f131.
f131: It is checked whether or not the access-target exclusion required resource is exclusive from another process. If it is not exclusive, the process proceeds to step f132. If it is exclusive, the process proceeds to step f133.
f132: Exclude the access target exclusion required resource.
f133: Waiting for the release of exclusion from another process, and then exclude the access-target exclusion required resource.
f134: The real exclusion state 16 of the corresponding process number in the process management table 14 is updated to the real exclusion completed.
f135: The exclusion success is returned from the shared resource exclusion means 13 to the data access means 12.
[0019]
Next, the operation of the exclusion release flow (step f15) in FIG. 2 will be described in detail with reference to the flowchart in FIG.
f150: The shared resource exclusion means 13 determines whether or not the provisional exclusion state 15 of the corresponding process number in the process management table 14 is provisional exclusion. If the provisional exclusion state 15 is not provisional exclusion, the process proceeds to step f151. If provisional exclusion is complete, the process proceeds to step f152.
f151: The exclusion cancellation failure is returned from the shared resource exclusion means 13 to the program 11, and the entire process of the exclusion control method of this embodiment is terminated.
f152: The temporary exclusion state 15 is updated to temporary exclusion not yet performed.
f153: It is determined whether or not the actual exclusion state 16 of the corresponding process number in the process management table 14 has been actually excluded. When the real exclusion state 16 is not actually excluded, the process proceeds to step f156, and when the actual exclusion state is completed, the process proceeds to step f154.
f154: The actual exclusion state 16 is updated to not actual exclusion.
f155: The exclusion of the resource requiring exclusion is released.
f156: The exclusion cancellation success is returned from the shared resource exclusion means 13 to the program 11, and the whole process of the exclusive control method of this embodiment is terminated.
Step f151 is for invalidating the second request, similar to step f113 in the provisional exclusive flow f11 in FIG.
[0020]
As described above, when an exclusion request is issued from a program, no exclusion is performed, and the data access means determines whether the data to be accessed is in an exclusion required resource or an exclusion unnecessary resource, and accesses If the target data is in a resource that does not require exclusion, access is performed immediately without performing exclusion, and exclusion is performed when the data access means actually accesses the resource that requires exclusion. This makes it possible to shorten the exclusive section of the shared resource (exclusive resource requirement). Furthermore, by recording the temporary exclusion status and the actual exclusion status for each process in the process management table, it is possible to detect errors in double exclusion and double exclusion cancellation. At this time, from the viewpoint of the program 11, when exclusion is requested, exclusion success is returned, then when data access is requested, data access is executed, and then, after data access is completed, exclusion cancellation is successful. The conventional process of returning is executed without change.
[0021]
[Second Embodiment]
6 and 7 are block diagrams of the exclusive control system for shared resources according to the second embodiment of the present invention. As shown in FIGS. 6 and 7, the shared resource exclusive control system according to the present embodiment processes a data access request from a program in the same manner as the shared resource exclusive control system according to the first embodiment. Data access means 22 for executing the exclusive access and exclusive resource release means 23 for processing the exclusion request and the exclusion release request from the program. The shared resource exclusion means 23 has a process management table 24 that represents the state of each process in which the program operates. In FIG. 6 and FIG. 7, the processing when the data requested to be accessed is data in the exclusion unnecessary resource is omitted.
[0022]
In the present embodiment, two different types of program groups 21a and 21b are handled. Both the programs in the program group 21a and the programs in the program group 21b cannot access the same exclusive resource simultaneously in the respective program groups, as in the first embodiment. However, unlike the first embodiment, it is possible to simultaneously access one exclusive resource between the program in the program group 21a and the program in the program group 21b.
[0023]
This is because the program 21A in the program group 21a makes an exclusion request to the shared resource exclusion means 23 with an exclusion type A that is valid only in the program group 21a, and the program 21B in the program group 21b is in the shared resource exclusion means 23. This is realized by performing two types of exclusion, such as making an exclusion request with an exclusion type B that is valid only within the program group 21b. However, when a real exclusion request is made from the data access means 22, the exclusive resource requirement for which type of exclusion is required at the time of data access in the exclusive resource requirement only by requesting data access from the program 21 </ b> A or 21 </ b> B as in the prior art. It is not possible to determine whether or not exclusion should be performed. Therefore, a method of providing information on which kind of exclusion should be performed from the program 21A or the program 21B to the data access means 22 is conceivable, but this changes the conventional access method, and the program and the data access means. With interface changes between. Therefore, in the present embodiment, the process management table 24 manages the temporary exclusive states 25A and 25B and the actual exclusive states 26A and 26B corresponding to each process of each program for each exclusion type, so that the conventional program It is possible to simultaneously access one exclusive resource without changing the interface between the data access means and the data access means.
[0024]
FIG. 8 is a flowchart for explaining the processing operations of the data access means 22 and the shared resource exclusion means 23 of FIG. The processing operations in steps f220 to f224 and f24 in FIG. 8 are the same as the processing operations in steps f120 to f124 and f14 in FIG. 2 of the first embodiment. In addition, the processing operations in the temporary exclusion flow (step f21), the actual exclusion flow (step f23), and the exclusion release flow (step f25) are performed by determining whether the exclusion type is A or B. The processing operation of each step in the flow of FIG. 2 of the first embodiment corresponding to the step is almost the same.
[0025]
Next, the operation of the temporary exclusion flow (step f21) in FIG. 8 will be described with reference to the flowchart in FIG.
f210A: The shared resource exclusion means 23 determines whether or not the exclusion request is the exclusion type A. If the exclusion request is not the exclusion type A, the process proceeds to step f210B. If the exclusion request is the exclusion type A, the process proceeds to step f211A.
f210B: The shared resource exclusion means 23 determines whether or not the exclusion request is the exclusion type B. If the exclusion request is the exclusion type B, the process proceeds to step f211B. If the exclusion request is not the exclusion type B, the process proceeds to step f215.
f211A / f211B: The shared resource exclusion means 23 selects the exclusion type A / B with the process number in the process management table 24 corresponding to the process of the exclusion request, and whether or not the provisional exclusion state 25A / 25B is provisionally exclusive. Determine whether. If not provisionally exclusive, the process proceeds to step f212A / 212B. If provisional exclusion has been completed, the process proceeds to step f214A / 214B.
f212A / 212B: The temporary exclusion state 25A / 25B is updated to exclusive.
f215: When the exclusion request is not the exclusion type B in step 210B, the exclusion request is an exclusion request from a program other than the programs 21A and 21B, and the exclusion success is returned to the program.
The flow of steps f213A to f214A and the flow of steps f213B to f214B are the same as the flow of steps f112 to f113 of FIG. 3 in the first embodiment.
[0026]
Next, the operation of the actual exclusive flow (step f23) in FIG. 8 will be described with reference to the flowcharts in FIGS.
Step f230A: The shared resource exclusion means 23 refers to the corresponding process number in the process management table 24, and whether or not the exclusive exclusion type in the temporary exclusion states 25A and 25B is the exclusion type A. Determine whether. If it is not exclusive type A, the process proceeds to step f230B. If the exclusion type is A, the actual exclusion request is an exclusion type A actual exclusion request, and the process proceeds to step f231A.
Step f230B: The shared resource exclusion means 23 determines whether or not the provisional exclusion state 25B of the corresponding process number in the process management table 24 has been provisionally excluded. If it has not been temporarily excluded, the process proceeds to step f236. If the provisional exclusion has been completed, the actual exclusion request is an exclusion type B actual exclusion request, and the process proceeds to step f231B.
The flow of steps f231A to f236 and the flow of steps f231B to f236 are the same as the flow of steps f130 to f135 of FIG. 4 in the first embodiment.
[0027]
Next, the operation of the exclusion release flow (step f25) of FIG. 8 will be described with reference to the flowcharts of FIGS.
In step f250A, the shared resource exclusion unit 23 determines whether or not the exclusion release request is the exclusion type A. When the exclusion release request is the exclusion type A, the process proceeds to step f251A. If the exclusion release request is not the exclusion type A, the process proceeds to step f250B. In step f250B, it is determined whether or not the exclusion release request is the exclusion type B. When the exclusion release request is the exclusion type B, the process proceeds to step f251B. If the exclusion release request is not the exclusion type B, the exclusion release request is an exclusion release request from a program other than the programs 21A and 21B, and the exclusion release success is returned to the program.
The flow of steps f251A to f257A and the flow of steps f251B to f257B are the same as the flow of steps f150 to f156 of FIG. 6 in the first embodiment.
[0028]
In the present embodiment, as in the case of the first embodiment, whether the exclusive resource is accessed by the data access means 22 without changing the interface between the program 1A or program 1B and the data access means 22. By determining whether or not to access the resource that does not require exclusion, it is determined whether or not to perform the exclusion, and the exclusion required resource is excluded when the data access unit 22 actually performs the data access. Allows shortening of exclusive sections. Further, in the present embodiment, the process management table 24 records and manages the status of each process for each exclusion type, so that the conventional interface between the program and the data access means 22 is not changed. One shared resource can be simultaneously accessed by programs in a plurality of program groups.
[0029]
【The invention's effect】
As described above, the shared resource exclusion control method according to the present invention determines whether to access exclusive required resources or exclusive unnecessary resources by data access means, and determines whether to perform exclusion. Since the exclusive resource is excluded when the data access means actually accesses the data, the shared resource (exclusive resource) of the shared resource (exclusive resource) can be changed without changing the conventional operation from the viewpoint of the program. It is possible to shorten the exclusive section.
Also, the shared resource exclusion control method according to the present invention records and manages the temporary exclusion status and the actual exclusion status for each process in the process management table. It is possible to detect errors.
In addition, the shared resource exclusive control method according to the present invention records and manages the status of each process for each exclusion type in the process management table, so that the conventional interface between the program and the data access means is used. It is possible to simultaneously access one shared resource by a program in a plurality of program groups without changing.
[Brief description of the drawings]
FIG. 1 is a block diagram of an exclusive control system for shared resources according to a first embodiment of the present invention.
FIG. 2 is a flowchart for explaining processing operations of a data access unit and a shared resource exclusion unit in FIG. 1;
FIG. 3 is a flowchart of temporary exclusion processing in FIG. 2;
FIG. 4 is a flowchart of real exclusion processing in FIG. 2;
FIG. 5 is a flowchart of exclusive release processing in FIG. 2;
FIG. 6 is a part of a block diagram of a shared resource exclusive control system according to a second embodiment of the present invention.
FIG. 7 is a block diagram of the exclusive control system for remaining shared resources of FIG. 6 according to the second embodiment of the present invention.
8 is a flowchart for explaining processing operations of the data access unit and the shared resource exclusion unit of FIG. 6;
FIG. 9 is a flowchart of temporary exclusion processing in FIG. 8;
10 is a part of a flowchart of real exclusion processing in FIG. 8;
11 is a flowchart of the flow following FIG. 10 in the real exclusion process of FIG. 8;
FIG. 12 is a flowchart of exclusive release processing of FIG. 8;
13 is a flowchart of the flow following FIG. 12 of the exclusive release processing of FIG.
FIG. 14 is a block diagram of a conventional exclusive control system for shared resources.
[Explanation of symbols]
11, 21A, 21B, 51 programs
12, 22, 52 Data access means
13, 23, 53 Shared resource exclusion means
14, 24 Process management table
15, 25A, 25B Temporary exclusive state
16, 26A, 26B Real exclusive state
21a, 21b program group

Claims (10)

An exclusive control method for a shared resource that performs an exclusive process, an exclusive release process, and a data access process of a shared resource by inputting an exclusive request, an exclusive release request, and a data access request from a program,
In response to the exclusion request from the program, the exclusion success of the shared resource is not performed, but the exclusion success is returned to the program,
Shared the exclusion process, based on the storage location of the data access request data, without exclusion if the data is data in the shared resource that does not require an exclusive, said data requires exclusive An exclusive control method for a shared resource, wherein the exclusive control is performed when the data is in the resource. An exclusive control method for a shared resource that performs an exclusive process, an exclusive release process, and a data access process of a shared resource by inputting an exclusive request, an exclusive release request, and a data access request from a program,
In response to the exclusion request from the program, the exclusion success of the shared resource is not performed, but the exclusion success is returned to the program,
The necessity / unnecessity of exclusion is determined based on the storage location of the data to be accessed when data access is requested from the program,
The exclusion request is continuously requested without requiring an exclusion request in the middle, and / or the exclusion request is continuously requested without requiring an exclusion request in the middle. When a request other than the first request among the plurality of exclusive requests and / or exclusive release requests is issued, an exclusive failure or / and exclusive release failure is returned to the program, and the processing for the request ends. To control exclusive use of shared resources. An exclusive control method for a shared resource that performs an exclusive process, an exclusive release process, and a data access process of a shared resource by inputting an exclusive request, an exclusive release request, and a data access request from one or more programs that can operate simultaneously. ,
In response to the exclusion request from the program, the exclusion success of the shared resource is not performed, but the exclusion success is returned to the program,
The necessity / unnecessity of exclusion is determined based on the storage location of the data to be accessed when data access is requested from the program, and a process management table that records the exclusion status for each process in which each program operates. An exclusive control method for a shared resource, wherein the exclusive state is changed with reference to the process management table.   When the process management table receives an exclusion request from the program, a temporary exclusion status display item indicating that exclusion success has been returned to the program without exclusion of shared resources, and a data access request from the program When the data requested for data access is in a shared resource that requires exclusion, an actual exclusion status display item that indicates that exclusion of the shared resource that requires exclusion has been performed, and And when the exclusive release request is issued from the program, the exclusion of the exclusive shared resource is indicated by setting the temporary exclusive status display item and the real exclusive status display item as exclusive. The exclusive control method for shared resources according to claim 3.   5. The exclusive control method for a shared resource according to claim 4, wherein when the exclusive request is issued from the program, the exclusive request is invalidated when the temporary exclusive state display item is already excluded.   5. The exclusive control of a shared resource according to claim 4, wherein when the exclusive release request is issued from the program, the exclusive release request is invalidated when the temporary exclusive state display item is not exclusive. Method.   The shared resource according to any one of claims 3 to 6, wherein the process management table records an exclusive state for each process in a request type of two or more types of the exclusive request and exclusive release request. Exclusive control method. Exclusion of shared resources having shared resource exclusion means for performing exclusive processing and exclusive release processing of shared resources and data access means for performing data access processing by inputting an exclusive request, an exclusive release request and a data access request from a program A control system,
In response to an exclusion request from the program, exclusion of shared resources is not performed, and exclusion success is returned to the program,
If the data access means is based on the storage location of the data requested to be accessed, and the data is data in a shared resource that does not require exclusion, the access to the data without performing exclusion of the shared resource was carried out, exclusive control system of the shared resources if the data in the shared resource, characterized in that request exclusive of co resources for the shared resource exclusion means the data requires exclusive. Shared resource exclusion means for performing exclusion processing and exclusion cancellation processing of shared resources by inputting exclusion requests, exclusion cancellation requests, and data access requests from one or more programs that can operate simultaneously, and data for data access processing An exclusive control system for shared resources having access means,
In response to the exclusion request from the program, the shared resource exclusion means does not perform exclusion of the shared resource, and returns an exclusion success to the program,
Whether or not exclusion is required is determined based on the storage location of the data to be accessed when data access is requested from the program, and the process management records the exclusion status for each process in which each program operates A shared resource exclusive control system comprising a table.   10. The exclusive control system for a shared resource according to claim 9, wherein the process management table records an exclusive state for each process in the request types of the two or more types of exclusive requests and exclusive release requests.

Images