JP2000003287A - Exclusive controller for shared resource, method therefor and recording medium for recording exclusive control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exclusive controller and exclusive control method of a shared resource preventing a process waiting state due to exclusive control when a normal shared resource is not changed, and preventing the deterioration of the processing performance of this system, and a recording medium for recording an exclusive control program. SOLUTION: This device is provided with plural processes 1 for operating information processing, a shared resource 2 shared by the plural processes 1, a shared resource access excluding means 3 for operating the exclusive control of the access of the processes 1 to the shared resource 2, and for preventing access to the shared resource 2 from being simultaneously performed by the plural processes 1, a shared resource changing means 4 for changing the content of the shared resource 2, and a shared resource access method changing means 5 for requesting the processes 1 to operate the exclusive control of access to the shared resource 2 by using the shared resource access excluding means 3 based on a request from the shared resource changing means 4 when it is necessary to change the content of the shared resource 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exclusive control apparatus, an exclusive control method, and a recording medium for recording an exclusive control program for a shared resource. The present invention relates to an exclusive control apparatus, an exclusive control method, and an exclusive control program for a shared resource suitable for a computer system having a shared resource that is not performed.

[0002]

2. Description of the Related Art In general, a computer system employs a shared resource exclusive control device so that a plurality of processes do not access the same shared resource at the same time.

As shown in FIG. 10, a conventional shared resource exclusive control apparatus includes a plurality of processes 50... And a shared resource 51 which the processes 50 commonly refer to.
A shared resource access exclusion unit 52 for exclusively accessing the shared resource 51;
And a shared resource changing means 53 for changing the content of the shared resource.

According to the conventional shared resource exclusive control apparatus, when the content of the ordinary shared resource 51 is changed, the shared resource changing means 53 changes the content of the shared resource 51 during the change. In order to prevent inconsistency in processing caused by the 50 referring to the shared resource 51, when both the shared resource changing unit 53 and the process 50 access the shared resource 51, the shared resource access exclusive unit 52 is set. Use
Exclusive control to prevent simultaneous access to the shared resource 51 has always been performed (hereinafter referred to as Conventional Example 1).

Japanese Patent Application Laid-Open No. 5-313923 discloses a shared resource exclusion control in which a resource acquisition request issued from each task to a resource shared by a plurality of tasks is received in the order of issuance and a queue is created. Table and
A shared resource exclusion control unit comprising: a shared resource exclusion control processing unit for eliminating simultaneous access of a plurality of tasks to one shared resource according to the queue; An exclusive control apparatus for shared resources, characterized in that exclusive control of a resource acquisition request is executed according to the priority order.

According to the conventional exclusive control apparatus for shared resources, even a task that has issued a request later can acquire a resource by overtaking the task that has issued the request earlier according to the processing priority. It is described that acquisition and release of resources in exclusive control are performed quickly and reliably (hereinafter referred to as Conventional Example 2).

[0007]

For example, network configuration information including information on communication lines and terminals is only referred to if there is no change in the configuration of communication lines and terminals. It is not necessary to perform exclusive control.

However, the shared resource exclusive control devices of the first and second prior arts normally perform the exclusive control even when the change of the shared resources is not necessary. At the time of access, a process wait (wait) occurs due to exclusive control. As a result, there is a problem that the processing performance of the system is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to avoid a process waiting state due to exclusive control at a normal time when the content of a shared resource is not changed, and to prevent a decrease in system processing performance. An exclusive control device, an exclusive control method, and a recording medium that records an exclusive control program.

[0010]

According to the present invention, there is provided a shared resource exclusive control apparatus comprising: a plurality of processes for performing information processing; a shared resource shared by the plurality of processes;
A shared resource access exclusion unit that performs exclusive control of access to a shared resource of a process so that access to the shared resource is not performed by multiple processes at the same time, and a shared resource change unit that changes the content of the shared resource When the content of the shared resource needs to be changed, exclusive control is performed on the access to the shared resource to the process using the shared resource access exclusive unit based on the request from the shared resource changing unit. And a shared resource access method changing means for making a request as described above.

The above-mentioned process includes access method determination information as to whether or not it is necessary to perform exclusive control on access to the shared resource by using the shared resource access exclusion means. When it is necessary to change the content of the process, the access method determination information of the process is changed to information that exclusive control is necessary.

The shared resource changing means obtains the access right of the shared resource from the shared resource access exclusive means, changes the shared resource, and, after the change of the shared resource, releases the access right of the shared resource to the shared resource access. Request exclusive means.

[0013] The shared resource access method changing means, after the shared resource is changed, performs exclusive control on the process to access the shared resource using the shared resource access exclusive means based on the request from the shared resource changing means. Request not to do so.

After the shared resource is changed, the shared resource access method changing means changes the access method determination information of the process to information that does not require exclusive control, based on a request from the shared resource changing means.

[0015] The shared resource access exclusion means, when there is a process or a shared resource changing means waiting for the acquisition of the access right of the shared resource, to the process or the shared resource changing means which is in the waiting state for the access right for the longest time. Grant access to grant access to shared resources.

The shared resource is, for example, network configuration information including communication line information and terminal information shared by a plurality of processes.

An exclusive control method for a shared resource according to the present invention comprises:
In a shared resource exclusive control method for performing exclusive control of access to a shared resource by a plurality of processes that perform information processing so that access to the shared resource is not performed by a plurality of processes at the same time, When the process can access the shared resource without performing the exclusive control, and when the content of the shared resource needs to be changed, the process requests the process to perform the exclusive control on the access to the shared resource. It is assumed that.

The recording medium of the present invention performs exclusive control of access to a shared resource by a plurality of processes for performing information processing, and prevents exclusive access to a shared resource from being performed by a plurality of processes at the same time. Normally, on a recording medium on which a program is recorded, a process for enabling a process to access a shared resource without performing exclusive control, and a process for sharing a process when the content of the shared resource needs to be changed. It is characterized by recording an exclusive control program for causing a computer to execute a process for requesting exclusive access control to access to a resource and to execute the process.

According to the present invention, usually, the access to the shared resource is performed without using the exclusive control, and when the content of the shared resource is changed, the process refers to the content being changed during the content change. In order to prevent the occurrence of inconsistency in the processing due to the exclusion, exclusive control can be temporarily used.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a shared resource exclusive control apparatus according to the present invention.

As shown in FIG. 1, the exclusive resource control apparatus for shared resources according to the present invention performs a plurality of processes 1... Shared resources 2 such as environmental information,
A shared resource access exclusion unit 3 for exclusively accessing the shared resource 2, a shared resource change unit 4 for changing the content of the shared resource 2, an access method of the shared resource 2 (a method using exclusive control and an exclusive control And a shared resource access method changing means 5 for changing the method that does not use. The process 1 accesses the shared resource 2 and performs processing. Process 1
The exclusive control for the shared resource 2 is determined based on the access method determination information 6 in the process 1 and is used or not used. It should be noted that the access method determination information 6 has an initial state of “no need for exclusive control”.
Is set to

The shared resource access exclusion means 3 performs exclusive control of access to the shared resource 2 using a lock semaphore or the like prepared in the system, and access to the shared resource 2 is processed by a plurality of processes 1 at the same time. Is not done.

The shared resource access method changing means 5 comprises:
Upon receiving a request from the shared resource changing unit 4, the process 1 requests the process 1 to change the access method of the shared resource 2 (use exclusive control or not use exclusive control).
After waiting for the completion of the change, the shared resource changing means 4 is notified of the completion of the change.

On the other hand, the process 1 that has received the change request from the shared resource access method changing means 5 needs to use the exclusive control or use the exclusive control in accordance with the access method determination information 6 in accordance with the change request. Change to none.

When the shared resource 2 is changed, the shared resource changing means 4 requests the shared resource access method changing means 5 to change the access to the shared resource 2 so that exclusive control is used. It waits for a completion notification from the method changing unit 5, requests the shared resource access exclusion unit 3 to acquire the access right of the shared resource 2 after the completion notification, acquires the access right, and changes the shared resource 2.

After the change of the shared resource 2, the shared resource changing means 4 requests the shared resource access exclusive means 3 to relinquish the access right of the shared resource 2, and prevents the shared resource access method changing means 5 from using the exclusive control. , And waits for a change completion notification from the shared resource access exclusion unit 3 to complete the process.

As described above, normally, the access to the shared resource 2 is performed without using the exclusive control.
It is possible to avoid a decrease in processing performance without causing a wait state due to exclusive control in normal processing, and when it becomes necessary to change the shared resource 2, the exclusive control is used for the process 1 to access the shared resource 2. By temporarily changing the access method as described above, it is possible to prevent another process 1 from accessing the shared resource 2 during the change of the shared resource 2 and causing inconsistency in processing.

FIGS. 2 to 7 are flowcharts for explaining the operation of the present invention.

FIG. 2 is a flowchart showing the flow of access of the process 1 to the shared resource 2. First, when the process 1 needs to access the shared resource 2, the process 1 checks the access method determination information 6 held by the process 1 and determines whether or not the exclusive control is necessary (step A1). .

If the access method determination information 6 indicates "no need for exclusive control", the shared resource 2 is accessed without using the exclusive control of the shared resource access exclusion means 3 (step A5). Note that the initial state of the access method determination information 6 is set to "no need for exclusive control", and the process 1 normally accesses the shared resource 2 without exclusive control.

If the access method determination information 6 indicates that "exclusive control is required", the access requesting unit 3 requests the shared resource access exclusion unit 3 to acquire the access right of the shared resource 2 (step A2).

If the acquisition of the access right of the shared resource 2 fails, the process 1 enters a waiting state until the acquisition of the access right of the shared resource 2 is successfully performed by the shared resource access exclusion means 3 (step A6).

If the access right of the shared resource 2 is successfully obtained, the process 1 accesses the shared resource 2 (step A3), and requests the shared resource access exclusion means 3 to release the access right of the shared resource 2. (Step A4), the access of the shared resource 2 of the process 1 is completed.

FIG. 3 is a flowchart showing the flow of changing the access method of the process 1 to the shared resource 2.
First, the process 1 requests the shared resource access method changing means 5 to change the access method of the shared resource 2 (step B1).

Next, the contents of the change request are confirmed (step B2). If it is changed to "no need for exclusive control", the access method determination information 6 in the process 1 is changed to "no need for exclusive control" (step B5).

When the content of the request from the shared resource access method changing means 5 is "necessity of exclusive control",
The access method determination information 6 in the process 1 is changed to "exclusive control is necessary" (step B3).

After the change of the access method determination information 6 is completed, the completion of the change of the shared resource access method is notified to the shared resource access method changing means 5 (step B).
4).

Accordingly, the access to the shared resource 2 subsequent to the process 1 is performed in accordance with the request of the shared resource access method changing means 5 (whether the exclusive control is used for the access to the shared resource 2 or not). Will do.

FIG. 4 is a flowchart showing a flow of changing the access method of the shared resource 2 by the shared resource access method changing means 5. First, the shared resource access method changing unit 5 receives a request for changing the access method of the shared resource 2 from the shared resource changing unit 4 (step C1).

The contents of the change in the requested access method are confirmed (step C2).
A request is made to all processes 1 to change the access of the shared resource 2 to "no need for exclusive control" (step C6).

When the content of the request from the shared resource changing means 4 is "necessity of exclusive control", all the processes 1 are requested to change the access of the shared resource 2 to "necessity of exclusive control" ( Step C3).

Thereafter, the shared resource access method changing means 5 confirms whether or not the completion of the access method change has been notified from all the processes 1 (step C4).

When the completion of the change of the access method is received from all the processes 1, the completion of the change of the access method of the shared resource 2 is notified to the shared resource changing means 4 (step C5).

Thus, after the process of changing the access method to the shared resource 2 by the shared resource access method changing means 5 is completed, all the access methods of the process 1 to the shared resource 2 are changed by the shared resource changing means 4. It is changed to the one that matches the request content (using exclusive control or not using exclusive control).

FIG. 6 shows the shared resource access exclusion means 3
9 is a flowchart showing a flow of acquiring an access right of the shared resource 2 of FIG. First, the shared resource access exclusion unit 3 sends the process 1 or the shared resource changing unit 4
A request to acquire the access right to the shared resource 2 is received (step E1).

Next, it is confirmed whether another process 1 or the shared resource changing means 4 has already acquired the access right (step E2).

When the other process 1 or the shared resource changing unit 4 has not acquired the access right, the access right is given to the process 1 or the shared resource changing unit 4 which has requested the acquisition of the access right, and the access to the shared resource 2 is performed. Is permitted (step E3).

If the other process 1 or the shared resource changing means 4 has acquired the access right, the process 1 or the shared resource changing means 4 which has requested the access right is obtained.
Is set to a waiting state, and a state of waiting for acquisition of an access right is set (step E4).

FIG. 7 shows shared resource access exclusion means 3
5 is a flowchart showing a flow of relinquishing the access right of the shared resource 2 of FIG. First, the shared resource access exclusion unit 3 sends the process 1 or the shared resource changing unit 4
A request to relinquish the access right to the shared resource 2 is received (step F1).

Next, the other process 1 or the shared resource changing means 4 checks whether or not there is a shared resource 2 waiting for access right acquisition (step F).
2).

When there is no access right waiting state, the completion of the access right release request is notified to the process 1 or the shared resource changing unit 4 which has requested the access right release (step F5).

When there is the process 1 or the shared resource changing unit 4 waiting for the access right of the shared resource 2, one of the process 1 or the shared resource changing unit 4 which has been waiting for the access right for the longest time among them. , The access right is released from the waiting state, and the access to the shared resource 2 is permitted (step F3).

The process 1 or the shared resource changing means 4 which has requested the release of the access right of the shared resource 2 is notified of the completion of the release of the access right (step F4).

FIG. 5 is a flowchart showing the flow of changing the shared resource 2 by the shared resource changing means 4. First, when the shared resource 2 is changed using the shared resource changing unit 4, first, the shared resource 2 is changed to use exclusive control for access to the shared resource 2. A request is made to change the access method to "necessary exclusive control" (step D1).

Next, it is confirmed whether or not a completion notification has been received from the shared resource access method changing means 5 (step D).
2).

After receiving the completion notification from the shared resource access method changing means 5 (step D2) (therefore,
After all the processes 1 are changed to use exclusive control for accessing the shared resource 2), the process 1 requests the shared resource access exclusion means 3 to acquire the access right of the shared resource 2 (step D3).

If the acquisition of the access right for the shared resource 2 fails, the shared resource access exclusion means 3
The shared resource changing unit 4 enters a waiting state (step D).
9).

If the access right to the shared resource 2 has been successfully acquired (therefore, it is guaranteed that the process 1 has not accessed the shared resource 2), the shared resource 2 is accessed, and its contents are changed ( Step D
4).

The shared resource 2 of the shared resource changing means 4
After the change of the shared resource 2 is completed, a request is made to the shared resource access exclusion means 3 to release the access right of the shared resource 2 (step D).
5) In order not to perform exclusive control for access to the shared resource 2 that is no longer needed, the shared resource access method change unit 5 changes the access to the shared resource 2 to “no need for exclusive control”. (Step D6). Then, the completion notification from the shared resource access method changing unit 5 is confirmed (step D7).

When the completion notification is received from the shared resource access method changing means 5 (therefore, all the processes 1 do not perform exclusive control on the access to the shared resource 2), and the process ends (step D8). ).

According to the present invention, the access to the shared resource 2 is normally performed without using the exclusive control,
When the content is changed, exclusive control can be temporarily used in order to prevent inconsistency in processing due to the process 1 referring to the content being changed during the content change. . Therefore, in the case of a computer system having a shared resource 2 that is shared and referenced by a plurality of processes 1 and whose contents are not normally changed, in the case of a system that updates the contents without stopping the processes 1, the shared resources It is possible to avoid a process waiting state due to the use of exclusive control in a normal state where the contents of No. 2 are not changed, and to prevent a reduction in the processing performance of the system.

FIG. 8 is a block diagram showing a configuration in a case where the exclusive control device for the shared resource 2 according to the present invention is applied to an online system for performing information processing by transmitting and receiving data to and from a terminal via a communication line. .

The system shown in FIG. 8 is an online system for performing information processing by transmitting and receiving data to and from the terminal 21 via the communication line 20. The system is processed by a plurality of processes 11 in order to improve the processing performance of the system. Has been done.

This system is referred to by all processes 11 and includes network configuration information 12 including line information and terminal information, and network configuration information access exclusion means 13 for controlling by using a lock semaphore.
Access method determination information 16 existing in each process 11 and used to determine whether or not to perform exclusive control using the network configuration information access exclusion means 13 to access the network configuration information 12; A network configuration information access method changing unit 15 for requesting the network 11 to change the access method of the network configuration information 12;
Adding communication lines and terminals while the online system is running,
It is composed of a network configuration information change unit 14 for reflecting deletion and attribute change in the network configuration information 12.

The network configuration information 12 is only referred to if there is no change in the configuration contents (addition, deletion, attribute, etc.) of the communication line or the terminal. Therefore, it is not necessary to perform exclusive control when accessing in the process 11. So process 1
No. 1 performs access without exclusive control.

However, when the configuration of the communication line or the terminal is changed during the operation of the online system and it is desired to reflect the change without stopping the system, the process 11 refers to the network configuration information 12. If the network configuration information 12 is changed during the process, inconsistency may occur in the processing.

Therefore, during the change of the network configuration information 12, it is necessary to guarantee that the process 11 does not access until the change is completed.

Therefore, when a change occurs in the configuration of the communication line or the terminal while the online system is operating, the network configuration information changing means 14 sends the network configuration information of the process 11 to the network configuration information access method changing means 15. A request is made to use the network configuration information access exclusion means 13 to perform exclusion control on the access 12.

In response to the request, the network configuration information access method changing means 15 requests all processes 11 to use exclusive control for accessing the network configuration information 12 and waits for the completion of the change from all processes 11.

Process 11 receiving a change request to use exclusive control to access network configuration information 12
The access method determination information 16 of the process 11
The access to the network configuration information 12 is changed to require exclusive control, and the completion is notified to the network configuration information access method change unit 15.

Thereafter, the process 11 uses the network configuration information access exclusion means 13 to access the network configuration information 12 and uses exclusive control.

The network configuration information access method changing means 15 receives the change completion notification from all the processes 11 (therefore, at this point, all the processes 11 use exclusive control to access the network configuration information 12). Is guaranteed), network configuration information changing means 1
4 is notified of the completion of the change request.

Upon receiving the change completion from the network configuration information access method changing unit 15, the network configuration information changing unit 14 acquires the access right of the network configuration information 12 by using the network configuration information access exclusive unit 13. After the success (therefore, it is guaranteed that no process 11 has accessed the network configuration information 12), the configuration of the communication line or the terminal is reflected in the network configuration information 12.

After the reflection on the network configuration information 12 is completed, the network configuration information changing unit 14 abandons the access right of the network configuration information 12 by using the network configuration information access exclusive unit 13, and How to access information 12
In order to return to a state in which exclusive control is not used, a request is made to the network configuration information access method changing means 15 so that exclusive control is not used.

The network configuration information access method changing means 15 which has received a request to change the access method of the network configuration information 12 so as not to use the exclusive control uses the exclusive control for the access of the network configuration information 12 to all the processes 11. A change request is made so as not to wait, and the completion notification from all processes 11 is waited for.

Each process 11 which has been requested to change the access of the network configuration information 12 so as not to use the exclusive control, accesses the access method determination information 16 of the process 11.
Is changed to require no exclusive control to access the network configuration information 12, and the completion of the change is notified to the network configuration information access method change unit 15.

Thereafter, the process 11 does not use the exclusive control for accessing the network configuration information 12.

The network configuration information access method changing means 15 receives the change completion notification from all processes 11 (therefore, at this point, it is guaranteed that all processes 11 do not use exclusive control to access network configuration information 12). ), Network configuration information changing means 14
Notify the completion of the change request.

The network configuration information changing unit 14 receives the completion notification from the network configuration information access method changing unit 15, and completes the process of changing the network configuration information 12.

FIG. 9 is a block diagram showing the configuration of another embodiment of the present invention. Another embodiment of the present invention has a recording medium 30 that records a program (exclusive control processing program) for causing a computer to execute the exclusive control processing of the shared resource 2 described above. The recording medium 30 may be a magnetic disk, a CD-ROM, a semiconductor memory, or another recording medium.

The exclusive control processing program is stored in the storage medium 30
The exclusive control device reads the shared resource 2 from the shared resource 2 according to the exclusive control processing program, and normally changes the shared resource 2 and the process for enabling the process 1 to access the shared resource 2 without performing the exclusive control. When the necessity arises, processing for requesting the process 1 to perform exclusive control on access to the shared resource 2 is performed.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope described in the claims.

[0083]

According to the present invention, usually, the access of the shared resource is performed without using the exclusive control, and when the content of the shared resource is changed, the process refers to the content being changed during the content change. In order to prevent the occurrence of inconsistency in the processing due to the above, exclusive control can be temporarily used. Therefore, in a computer system that has shared resources that are shared and referenced by multiple processes and whose contents do not normally change, if the system updates the contents without stopping the processes, the contents of the shared resources are updated. It is possible to avoid a process waiting state due to the use of exclusive control in a normal state where no change is made, and to prevent a decrease in the processing performance of the system.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a shared resource exclusive control apparatus according to the present invention.

FIG. 2 is a flowchart illustrating a flow of access to a shared resource of a process.

FIG. 3 is a flowchart illustrating a flow of changing an access method of a process to a shared resource.

FIG. 4 is a flowchart showing a flow of changing a shared resource access method by a shared resource access method changing unit.

FIG. 5 is a flowchart showing a flow of changing a shared resource by a shared resource changing unit.

FIG. 6 is a flowchart illustrating a flow of acquiring an access right to a shared resource by a shared resource access exclusion unit.

FIG. 7 is a flowchart showing a flow of relinquishing a shared resource access right by a shared resource access exclusion unit.

FIG. 8 shows an exclusive control apparatus for shared resources according to the present invention;
1 is a block diagram illustrating a configuration in a case where the present invention is applied to an online system that performs information processing by transmitting and receiving data to and from a terminal via a communication line.

FIG. 9 is a block diagram showing a configuration of another embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of a conventional shared resource exclusive control device.

[Explanation of symbols]

 1: Process 2: Shared resource 3: Shared resource access exclusion means 4: Shared resource change means 5: Shared resource access method change means 6: Access method determination information 11: Process 12: Network configuration information 13: Network configuration information access exclusion means 14: Network configuration information changing means 15: Network configuration information access method changing means 16: Access method determination information 20: Communication line 21: Terminal 30: Recording medium

Claims (9)

[Claims] A plurality of processes for performing information processing, a shared resource shared by the plurality of processes, and exclusive control of access to the shared resource of the process, wherein a plurality of processes simultaneously access the shared resource. A shared resource access exclusion unit that prevents processing in the shared resource, a shared resource change unit that changes the content of the shared resource, and a shared resource change unit when the content of the shared resource needs to be changed. Based on the request from
A shared resource access method changing unit for requesting the process to perform exclusive control on access to the shared resource using the shared resource access exclusive unit; and a shared resource exclusive control device. . 2. The shared resource access method changing unit, wherein the process includes access method determination information as to whether or not it is necessary to perform exclusive control on access to the shared resource using the shared resource access exclusive unit. 2. The shared resource according to claim 1, wherein, when the content of the shared resource needs to be changed, the access method determination information of the process is changed to information that exclusive control is necessary. Exclusive control unit. 3. The shared resource changing unit obtains a shared resource access right from the shared resource access exclusive unit, changes the shared resource, and releases the shared resource access right after changing the shared resource. 3. The shared resource exclusive control apparatus according to claim 1, wherein the shared resource access exclusive control unit requests the shared resource access exclusive unit. 4. The shared resource access method changing means, after the shared resource is changed, uses the shared resource access exclusive means for the process based on a request from the shared resource changing means. The exclusive resource control apparatus for shared resources according to any one of claims 1 to 3, wherein a request is made not to perform exclusive control on access to the shared resource. 5. The shared resource access method changing means, after changing the shared resource, changes the access method determination information of the process to information indicating that there is no need for exclusive control based on a request from the shared resource changing means. The shared resource exclusive control device according to claim 4, wherein the exclusive resource control device changes the shared resource. 6. The shared resource access exclusion means, if there is a process or a shared resource changing means waiting for the access right acquisition of the shared resource, the process or the shared resource change waiting state for the longest time. 6. The method according to claim 1, wherein an access right is given to the means, and access to the shared resource is permitted.
An exclusive control apparatus for a shared resource according to any one of the above items. 7. A shared resource exclusive control apparatus according to claim 1, wherein said shared resource is network configuration information including communication line information and terminal information shared by a plurality of processes. 8. A shared resource exclusive control method for performing exclusive control of access to a shared resource by a plurality of processes performing information processing so that access to the shared resource is not performed by a plurality of processes at the same time. Normally, the process can access the shared resource without performing the exclusive control, and when the content of the shared resource needs to be changed, the process performs the exclusive control on the access to the shared resource for the process. A method for exclusive control of shared resources. 9. A recording in which an exclusive control program for performing exclusive control of access to a shared resource by a plurality of processes for performing information processing and preventing access to the shared resource from being performed by a plurality of processes at the same time is recorded. In the medium, in a normal state, a process for allowing the process to access the shared resource without performing the exclusive control, and when the content of the shared resource needs to be changed, the process A recording medium that records a process of requesting exclusive access control for access to the computer and an exclusive control program for causing a computer to execute the process.