JPH09330240A - Exclusive resource control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operability and reliability of a computer system by setting any arbitrary name (resource name) to an exclusive resource and acquiring/releasing the exclusive resource by designating that name. SOLUTION: When a report (a report based on the registration request of the exclusive resource to be issued from a process 11 while designating the arbitrary resource name) from a resource registration means 21 is received, a resource registration control means 24 registers the resource name of the exclusive resource related to the registration request into an exclusive resource managing table 31. When a report (a report based on the acquisition/release request of the exclusive resource to be issued from the process 11 while designating the resource name registered in the exclusive resource managing table 31) from a resource acquiring/releasing means 23 is received, an exclusive resource control means 25 accesses the exclusive resource managing table 31 so that exclusive control on the exclusive resource having the designated resource name can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resource exclusive control system, and more particularly to a resource exclusive control system in a computer system having resources shared by a plurality of processes.

[0002]

2. Description of the Related Art Conventionally, this type of resource exclusion control system has a method of competing for resources with other processes when a process needs to occupy and use a resource shared by a plurality of processes. Used to prevent.

An example of a conventional resource exclusive control system is described in Japanese Patent Application Laid-Open No. 4-539 (see, in particular, FIGS. 1, 5, and 6 of the publication).

The resource exclusive control method described in this publication (the title of the invention of this publication is "exclusive control method") is a computer system in which resources are shared among a plurality of processes, and complicated exclusive control is performed. Is a method that can be easily performed.

In this resource exclusive control system, means for storing and managing a state in which a shared resource is locked as a database (storage managing means), means for receiving a lock control request for the shared resource (request accepting means), Means for inquiring the database about the lock control status related to the requested shared resource (inquiry means), and means for notifying the requester of the lock control of the inquiry result (result notifying means)
And a means (lock control means) for performing the requested lock control according to the inquiry result.

In this resource exclusive control method, the following processing is performed.

The shared resource and the history of its lock control state are registered in the database by the storage management means.
The request for acquiring or releasing the shared resource is represented as a database type and is accepted by the request accepting means. The inquiry means makes an inquiry to the database using the accepted database formula. If the resource can be obtained from the inquiry result, the lock control means locks the resource. When the resource cannot be acquired, the result notifying unit notifies the request source of the resource acquisition failure.

Another example of the conventional resource exclusive control system is described in Japanese Patent Application Laid-Open No. 5-250188 (in particular, refer to FIG. 1 of the publication).

The resource exclusion control system described in this publication (the title of the invention relating to this publication is "process priority control system") uses a semaphore as a resource exclusion control unit between processes.

The inter-process resource exclusive control unit subtracts 1 from the value of the semaphore when acquiring the resource. If the semaphore does not become negative as a result of the subtraction, the current process is made ready to execute, and if it becomes negative, the current process is stopped by a system call and placed in the process queue of the semaphore. When releasing resources, the semaphore value is incremented by 1. If the result of the addition is not positive, a process is selected from the process queues in the semaphore and is ready for execution.

[0011]

The above-mentioned conventional resource exclusive control system has the following problems.

The first problem is that it is difficult for a user to specify a resource (exclusive resource) to be subject to exclusive control.

The reason is that the resource specified for performing exclusive control needs to be expressed as a database expression or a semaphore, and therefore cannot be specified in a format easily recognized by the user.

The second problem is that the exclusive resource may be missed and the exclusive resource may become unusable.

The reason is to consider the case where the resources are not released before the process that is already acquiring the resources is terminated,
This is because no consideration has been given to the case where the process of resource acquisition terminates abnormally.

In view of the above points, an object of the present invention is to set an arbitrary name (resource name) to a competing resource (exclusive resource),
The purpose is to provide a resource exclusion control method that can acquire and release exclusive resources by specifying the name.

Another object of the present invention is to release the exclusive resource in the state still acquired by the terminated process even when the process which is acquiring the exclusive resource ends without releasing the exclusive resource. The purpose is to provide a resource exclusion control method that enables other processes to use the exclusive resource.

By achieving the above object, the resource exclusive control system of the present invention improves the operability and reliability of the computer system.

[0019]

The resource exclusion control method of the present invention includes a process group which is a set of processes that exclusively use a resource, a "resource name" indicating the name of the exclusive resource for each exclusive resource, "Resource acquisition status" that manages the acquisition status of exclusive resources, "Resource acquisition process ID" that indicates the process ID of the process that is acquiring the exclusive resources, and "Resource waiting process management information" that manages the process waiting for exclusive resources , An exclusive resource management table in the storage device, a process management table in the storage device that stores the process ID of the generated process, and an arbitrary resource name is designated and notified from the process in the process group. Resource registration means for receiving a registration request for exclusive resources and returning a resource registration success notification / resource registration failure notification for the registration request to the process , Resource registration control means for accessing the exclusive resource management table by the notification from the resource registration means, and registering the resource name of the exclusive resource relating to the registration request in the exclusive resource management table, and the resource registration control means Resource acquisition means for accepting an exclusive resource acquisition request notified from a process in the process group with a resource name specified, and returning a resource acquisition success notification / resource acquisition failure notification to the acquisition request to the process; The exclusive resource release request notified from the process in the process group with the resource name registered by the registration control means specified is accepted, and a resource release success notification / resource release failure notification for the release request is returned to the process. Resource releasing means, and the exclusive resource management by notification from the resource acquiring means and the resource releasing means. A resource exclusive control means for accessing the table and realizing exclusive control for an exclusive resource having a specified resource name, and creating the process management table for the process when the process is created, and managing the process by the process management table. And a process management means for performing the process.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the drawings.

(1) First Embodiment FIG. 1 is a block diagram showing the configuration of the first embodiment of the resource exclusive control system of the present invention.

The resource exclusion control system of this embodiment comprises a process group 10, an exclusion controller 20 for controlling resource exclusion,
A storage device 30 that stores information and an OS (Operating)
ngSystem) basic unit 40 and.

The process group 10 includes a plurality of processes that request control of the exclusive resource by designating a resource name requiring exclusive control to the exclusive control device 20 (any one of these processes). The two processes are called "process 11").

The exclusive control device 20 receives a request for registration of an exclusive resource with a resource name specified and returns a resource registration success notification or a resource registration failure notification, and an exclusive resource with a resource name specified. A resource acquisition unit 22 that receives an acquisition request and returns a resource acquisition success notification or a resource acquisition failure notification, and a resource that receives a release request of an exclusive resource with a resource name specified and returns a resource release success notification or a resource release failure notification Release means 23 and resource registration control means 24 for registering information regarding registration of exclusive resources in the storage device 30.
And a resource exclusion control unit 25 that realizes exclusion control by registering information regarding acquisition and release of exclusion resources in the storage device 30.

The storage device 30 includes an exclusive resource management table 31 for managing information on exclusive resources, a resource queuing management table 32 for managing queuing of exclusive resources,
It includes a process management table 33 that manages each process in the process group 11.

The exclusive resource management table 31 includes, as the items of each entry, a "resource name" set by the user for the exclusive resource, a "resource acquisition state", and a "process ID ( IDenticatio
n) ”and“ resource queuing process management information ”that manages the resource queuing queue queuing the resource queuing management table 32.

The resource queuing management table 32 has a "process ID" indicating a process waiting for an exclusive resource.
And a "next pointer" indicating the address of the next resource queuing management table 32 in the resource queuing queue (the resource queuing management tables 32 forming the resource queuing queue exist for the number of waiting processes). .

In the resource exclusion control method of this embodiment, the "resource queuing process management information" for each exclusive resource in the exclusive resource management table 31 is the resource queuing queue at the head of the resource queuing queue corresponding to each exclusive resource. It has the address of the management table 32 or “the fact that the resource waiting management table does not exist” (information indicated by “NULL” in FIG. 5 and the like). In addition,
The content of the “resource queuing process management information” is not limited to the above-mentioned content, and all resource queuing management tables 3
Other contents such as the contents in which the address 2 is set in the waiting order are also conceivable.

The process management table 33 includes a "process ID" indicating the created process.

The OS basic unit 40 includes a process management means 41 for managing the generation of processes.

FIG. 2 is a flow chart showing the exclusive resource registration processing in the resource exclusive control method of this embodiment. This process includes an input resource name search step 201, a registered determination step 202, an input resource name registration step 203, an unused setting step 204, and a resource registration success notification step 2
05 and a resource registration failure notification step 206.

FIG. 3 is a flowchart showing the exclusive resource acquisition processing in the resource exclusive control method of this embodiment. This process includes an input resource name search step 301, a registered determination step 302, a resource acquisition state acquisition step 303, an unused determination step 304, and an in-use setting step 305.
A process ID recording step 306, a resource acquisition success notification step 307, and a resource acquisition failure notification step 30.
8, a waiting presence / absence determining step 309, a resource acquisition failure notifying step 310, and a resource waiting queue registration step 311.

FIG. 4 is a flow chart showing the exclusive resource release processing in the resource exclusive control method of this embodiment. This processing includes input resource name search step 401, registered determination step 402, resource acquisition state acquisition step 403, busy determination step 404, resource acquisition process determination step 405, resource release success notification step 406, The process includes a waiting process presence / absence determination step 407, a resource acquisition success notification step 408, a resource release failure notification step 409, and an unused setting step 410.

FIG. 5 is a diagram for explaining a specific operation of the resource exclusive control method of this embodiment.

Next, the operation of the resource exclusive control system of this embodiment having the above-mentioned configuration will be described.

As a premise of each operation described below, when a process that constitutes the process group 10 is newly created, the process management means 41 in the OS basic unit 40 causes the process management table 33 for the process.
(Process management table 33 having the process ID of the process) is created in the storage device 30.

First, the operation related to registration of exclusive resources will be described with reference to FIGS. 1 and 2.

Any one process (process 11) in the process group 10 uses the arbitrary resource name (resource name of the exclusive resource to be registered) designated by the user in the exclusive control device 20. The resource registration means 21 is notified.

The resource registration means 21 sends the notice to the resource registration control means 24.

The resource registration control means 24 retrieves the "resource name" of the exclusive resource management table 31 in the storage device 30 by the resource name (called "input resource name") notified from the process 11 (step 201), It is determined whether or not the input resource name is already registered in the exclusive resource management table 31 (step 202).

The resource registration control means 24, step 202
If it is determined that "the input resource name is registered in the exclusive resource management table 31", the resource registration means 21
Process I of process 11 (process requesting registration)
Pass control with D. The resource registration means 21 notifies the process 11 of the resource registration failure (step 206).

On the other hand, when the resource registration control means 24 determines in step 202 that the input resource name is not registered in the exclusive resource management table 31, a new entry of the exclusive resource management table 31 is created. The input resource name is registered in the "resource name" (step 203), and the "resource acquisition state" of the entry is set to "unused" (step 2).
04).

After that, the resource registration control means 24 passes control to the resource registration means 21 together with the process ID of the process 11. The resource registration means 21 notifies the process 11 of successful resource registration (step 205).

Secondly, with reference to FIG. 1 and FIG. 3, the operation relating to the acquisition of the exclusive resource in the resource exclusive control method of this embodiment will be described.

The process requesting acquisition of the exclusive resource in the process group 10 (referred to as process 11) notifies the resource acquisition means 22 in the exclusive control device 20 of the resource name of the exclusive resource to be acquired.

The resource acquisition means 22 sends the notification to the resource exclusion control means 25.

The resource exclusive control means 25 retrieves the "resource name" of the exclusive resource management table 31 in the storage device 30 by the resource name (called "input resource name") notified from the process 11 (step 301), It is determined whether or not the input resource name is already registered in the exclusive resource management table 31 (step 302).

The resource exclusive control means 25 executes step 302.
When it is determined that "the input resource name is not registered in the exclusive resource management table 31", the resource acquisition unit 2
Control is passed to the process 2 together with the process ID of the process 11 (process of the acquisition request source). The resource acquisition unit 22 notifies the process 11 of resource acquisition failure (step 308).

On the other hand, when the resource exclusion control means 25 determines in step 302 that the input resource name is registered in the exclusive resource management table 31, the registration entry (input of the exclusive resource management table 31 "Resource acquisition status" of entry whose resource name is registered in the item "Resource name"
Is acquired (step 303), and it is determined whether or not the "resource acquisition status" is "unused" (step 30).
4).

The resource exclusive control means 25 executes step 304.
When it is determined that the "resource acquisition state" is "unused" in step S1, the "resource acquisition state" is set to "in use" (step 305), and the process 11 (process that acquired the resource) is set. ) Is recorded (set) in the "resource acquisition process ID" of the registration entry (step 30).
6).

After that, the resource exclusive control means 25 passes control to the resource acquisition means 22 together with the process ID of the process 11. The resource acquisition means 22 notifies the process 11 of successful resource acquisition (step 307).

On the other hand, when the resource exclusion control means 25 determines in step 304 that the "resource acquisition state" is "in use" (not "unused"), the exclusive resource (input Whether there is a wait for an acquisition request for the exclusive resource specified by the resource name (whether the resource wait management table 32 for the process waiting to acquire the exclusive resource is queued in the resource wait queue) Is determined (step 309).

The resource exclusive control means 25 executes step 309.
When it is determined that there is no waiting for the acquisition request, the control is passed to the resource acquisition unit 22 together with the process ID of the process 11. The resource acquisition means 22 uses the process 11
Is notified of the resource acquisition failure (step 310).

On the other hand, if it is determined in step 309 that there is an acquisition request wait, the resource wait management table 32 for the process 11 is registered in the resource wait queue for the exclusive resource (step 31).
1). That is, the resource waiting management table 32 is acquired, the process ID indicating the process 11 is set in the “process ID” of the resource waiting management table 32,
The resource queuing management table 32 is queued at the end of the resource queuing queue managed by the "resource queuing process management information" of the registration entry of the exclusive resource management table 31.

Thirdly, with reference to FIG. 1 and FIG. 4, the operation relating to the release of the exclusive resource in the resource exclusive control method of this embodiment will be described.

The process requesting the release of the exclusive resource (process 11) in the process group 10 notifies the resource releasing means 23 in the exclusive control device 20 of the resource name of the exclusive resource to be released.

The resource releasing means 23 sends the notification to the resource exclusive control means 25.

The resource exclusive control means 25 retrieves the "resource name" of the exclusive resource management table 31 in the storage device 30 by the resource name (called "input resource name") notified from the process 11 (step 401), It is judged whether or not the input resource name is already registered in the exclusive resource management table 31 (step 402).

The resource exclusive control means 25 executes step 402.
If it is determined that "the input resource name is not registered in the exclusive resource management table 31", the resource releasing means 2
The control is passed to the process No. 3 together with the process ID of the process 11 (release request source process). The resource releasing means 23 notifies the process 11 of the resource releasing failure (step 409).

On the other hand, when the resource exclusion control means 25 determines in step 402 that the input resource name is registered in the exclusive resource management table 31, the registration entry (input of the exclusive resource management table 31 "Resource acquisition status" of entry whose resource name is registered in the item "Resource name"
Is acquired (step 403), and it is determined whether or not the “resource acquisition status” is “in use” (step 40).
4).

The resource exclusive control means 25 executes step 404.
When it is determined that “the“ resource acquisition state ”is“ unused ”(not“ in use ”)”, the resource releasing means 2
Control is passed to the process 3 together with the process ID of the process 11.
The resource releasing means 23 notifies the process 11 of the resource releasing failure (step 409).

On the other hand, the resource exclusive control means 25 determines in step 404 that "the" resource acquisition state "is" in use "".
If it is determined that the process ID of the process 11 (process ID of the process of the release request source) and the registration entry item “resource acquisition process I” in the exclusive resource management table 31
It is determined whether or not the two process IDs match (whether or not the release request source process is the process that has acquired the resource) by comparing with the process ID set in "D" (step 405).

The resource exclusive control means 25 executes step 405.
When it is determined that "the two process IDs do not match", the control is passed to the resource releasing means 23 together with the determination result. The resource releasing means 23 notifies the process 11 of the resource releasing failure (step 409).

On the other hand, when the resource exclusion control means 25 determines in step 405 that "both process IDs match", it also passes control to the resource release means 23 together with the determination result. In this case, the resource releasing means 23 uses the process 1
1 is notified of resource release success (step 406).

Further, when the resource exclusion control means 25 determines in step 405 that "both process IDs match", the process of step 406 is followed by "resource waiting" of the registration entry of the exclusive resource management table 31. Process management information ”, refer to the exclusive resource (process 11
It is determined whether or not there is a process waiting for the exclusive resource released from (whether the resource waiting management table 32 is queued in the resource waiting queue for the exclusive resource) (step 407).

The resource exclusive control means 25 executes step 407.
If it is determined that "there is a process waiting for the exclusive resource", the resource acquiring unit 22 is notified of the resource acquisition success to the waiting process (step 408). That is, the “process ID” of the resource queuing management table 32 at the head of the resource queuing queue managed by the “resource queuing process management information” of the registration entry is acquired, and the process having the process ID is acquired via the resource acquisition means 22. The resource acquisition success is notified, the process ID is set in the “resource acquisition process ID” of the registration entry of the exclusive resource management table 31, and the resource queuing management table 32 for the process is dequeued from the resource queuing queue (for the process). The address set in the next pointer of the resource waiting management table 32 is set in the "resource waiting process management information" of the registration entry).

On the other hand, when the resource exclusion control means 25 determines in step 407 that "there is no process waiting for the exclusive resource", it sets the "resource acquisition state" of the registration entry of the exclusive resource management table 31. It is set to "unused" (step 410).

Finally, with reference to FIG. 5, a specific operation of the resource exclusive control system of this embodiment will be described.

Here, referring to FIG. 5, process A
(Process whose process ID is "100") and Process B (Process whose process ID is "200")
Consider a case where the exclusive control is performed on the exclusive resource RSC1 (exclusive resource having the resource name "RSC1"). In this case, the following processes (1) to (3) are sequentially performed (the following numbers (1) to (4) in FIG. 5 correspond to each other).

Process A assigns “RS
A registration request is made to register the exclusive resource with the resource name "C1". Based on this registration request, "RS" is added to the "resource name" of one entry in the exclusive resource management table 31.
"C1" is registered, and "unused" is set in the "resource acquisition state" of the entry.

The process A makes an acquisition request to acquire the exclusive resource RSC1. Based on this acquisition request, "in use" is set in the "resource acquisition state" of the entry (the entry in which "RSC1" is registered in the "resource name") of the exclusive resource management table 31, and the "resource “100”, which is the process ID of the process A, is set in the “acquired process ID”.

The process B makes an acquisition request to acquire the exclusive resource RSC1. Exclusive resource management table 31
Since the “resource acquisition status” of the relevant entry of “is in use”, the process B receives the exclusive resource R based on this acquisition request.
The meeting of SC1 will be held. That is, the resource queuing management table 32 for the process B is acquired, the process ID “200” of the process B is set in the resource queuing management table 32, and the resource queuing management is set in the “resource queuing process management information” of the entry. The address of the table 32 is set.

The process A makes a release request to release the exclusive resource RSC1. At this time, process B
Is waiting for the exclusive resource RSC1, the process B is released after the exclusive resource RSC1 is released from the process A.
Is notified that the resource acquisition of the exclusive resource RSC1 is successful.
Further, in this case, the process ID of the process B, "200", is set in the "resource acquisition process ID" of the entry of the exclusive resource management table 31, and "NULL" is set in the "resource waiting process management information". .

The process B makes a release request to release the exclusive resource RSC1. At this time, the exclusive resource R
Since there is no process waiting for SC1,
“Unused” is set in the “resource acquisition state” of the entry of the exclusive resource management table 31.

(2) Second Embodiment FIG. 6 is a block diagram showing the configuration of the second embodiment of the resource exclusive control system of the present invention.

The resource exclusion control system of this embodiment is similar to the resource exclusion control system of the first embodiment in that it includes a process group 10,
Exclusive control device 20, storage device 30, OS basic unit 40
It is comprised including.

Referring to FIG. 6, the resource exclusive control method of the present embodiment uses the process management table 33 in the storage device 30.
Is different from the resource exclusion control method of the first embodiment in that it has a "process ID" and an "exclusive resource acquisition flag" (including a difference in processing contents due to the existence of the "exclusive resource acquisition flag"). ing. Here, the "exclusive resource acquisition flag" of a certain process management table 33 is set when the process for the process management table 33 is acquiring the exclusive resource, and is cleared when the exclusive resource is not being acquired.

FIG. 7 is a flow chart showing the processing at the end of the process in the resource exclusive control method of this embodiment. This process includes an exclusive resource acquisition determining step 701, a resource releasing step 702, a waiting process presence / absence determining step 703, a resource acquisition success notifying step 704, and an unused setting step 705.

FIG. 8 is a diagram for explaining a specific operation of the resource exclusive control method of this embodiment.

Next, the operation of the resource exclusive control system of this embodiment having the above-mentioned configuration will be described.

The operations relating to the registration, acquisition and release of the exclusive resource are the same as those in the above-mentioned first embodiment.

However, the following operations are peculiar to this embodiment.

Resource exclusive control means 2 in the exclusive control device 20
5 is a process in the process group 10 (process 11
When the exclusive resource is acquired or released by
The process ID of the process 11 is notified to the process management means 41 in the basic unit 40.

When acquiring the exclusive resource, the process management means 41 sets the "exclusive resource acquisition flag" in the process management table 33 for the process (here, the process 11) (sets information indicating acquisition of the exclusive resource). . When releasing the exclusive resource, the “exclusive resource acquisition flag” is cleared (the information indicating acquisition of the exclusive resource is released).

As will be described later, if the "exclusive resource acquisition flag" of the process management table 33 for a process at the end of a process is set, the process management unit 41 acquires the exclusive resource. It is determined that the resource exclusion control means 25 remains, and the resource exclusion control means 25 is notified to that effect (thus, the resource exclusion control means 25
Searches for an exclusive resource that the process is in the process of acquiring and releases such exclusive resource).

Next, with reference to FIG. 6 and FIG. 7, the “operation at the end of the process” which is an operation peculiar to this embodiment will be described.

The process management means 41 uses the process group 10
At the end of a process inside (called process 11),
The process management table 33 for the process 11 is referred to, the "exclusive resource acquisition flag" of the process management table 33 is checked, and the "exclusive resource acquisition flag" is checked.
Is set (whether the process 11 is acquiring an exclusive resource) (step 701).

The process management means 41 uses step 701.
When it is determined that "the" exclusive resource acquisition flag "is set", the resource exclusion control means 25 is notified to that effect. If it is determined in step 701 that "the" exclusive resource acquisition flag "is not set", the process ends.

Upon receiving the notification, the resource exclusive control means 25 searches the exclusive resource management table 31 for the exclusive resource acquired by the process 11 (the process ID of the process 11 is set to "resource acquisition process ID"). Search for entry), "Resource acquisition process ID" of the entry
Process 1 to clear the exclusive resource by clearing
Release from 1 (step 702).

Next, the resource exclusion control means 25 refers to the "resource waiting process management information" of the relevant entry in the exclusive resource management table 31, and determines whether or not there is a process waiting for the relevant exclusive resource (the relevant resource). It is determined whether the resource queuing management table 32 is queued in the resource queuing queue managed by the "resource queuing process management information" (step 703).

The resource exclusive control means 25 executes step 703.
If it is determined that "there is a process waiting for the exclusive resource", the "process I" of the resource waiting management table 32 at the head of the resource waiting queue is determined.
D ”is acquired, the process having the process ID is notified to the process having the process ID via the resource acquiring unit 23, and the process ID is set in the“ resource acquisition process ID ”of the entry of the exclusive resource management table 31. The resource waiting management table 32 for the process is dequeued from the resource waiting queue (step 704).

On the other hand, when the resource exclusion control means 25 determines in step 703 that "there is no process waiting for the exclusive resource", the resource exclusive control unit 25 sets the "resource acquisition state" of the entry in the exclusive resource management table 31. It is set to "unused" (step 705).

Finally, with reference to FIG. 8, a specific operation of the resource exclusive control method of this embodiment will be described.

Here, with reference to FIG. 8, consider a case where the process A terminates after registering and acquiring the exclusive resource RSC1 (exclusive resource whose resource name is "RSC1"). In this case, the following processes (1) to (3) are sequentially performed (the following numbers (1) to (4) in FIG. 8 correspond to each other).

Based on the registration request from process A,
"RSC1" is registered in the "resource name" of one entry in the exclusive resource management table 31, and "unused" is set in the "resource acquisition state" of the entry.

When the process A acquires the exclusive resource with the resource name “RSC1” (exclusive resource RSC1), the process A
The "exclusive resource acquisition flag" of the process management table 33 is set ("1" is set).

After that, the process A receives the exclusive resource RSC
It is assumed that the process ends without releasing 1. At this time, since the "exclusive resource acquisition flag" of the process management table 33 for the process A is set, the process management means 41 notifies the resource exclusion control means 25 to that effect. Upon receiving the notification, the resource exclusive control means 25 searches the exclusive resource management table 31 by the process ID of the process A,
The process A acquires the entry for the exclusive resource RSC1 being acquired, and sets the "resource status" of the entry to "unused".
Set to.

[0098]

As described above, according to the present invention,
The following effects are produced.

The first effect is that when a process acquires an exclusive resource, the user of the process can easily specify the exclusive resource. This improves the operability of the computer system when acquiring exclusive resources.

The reason why such an effect occurs is that the user can set an arbitrary resource name by the resource registration control means for the resource (exclusive resource) to be subject to exclusive control,
This is because the resource can be acquired and released with the resource name set by the user thereafter by the control of the resource exclusive control means.

The second effect is the effect produced by the invention described in claim 2, and is that even if a process terminates while acquiring the exclusive resource, the exclusive resource can be automatically released. As a result, even if the exclusive resource is missed, it is possible to prevent "that exclusive resource cannot be acquired from another process" and improve the reliability of the computer system.

The reason why such an effect is produced is that the process management means detects a process that has ended while acquiring the exclusive resource, and the resource exclusive control means releases the exclusive resource from the process.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of a resource exclusive control system of the present invention.

FIG. 2 is a flowchart showing exclusive resource registration processing in the resource exclusive control method shown in FIG.

3 is a flowchart showing an exclusive resource acquisition process in the resource exclusive control system shown in FIG. 1. FIG.

FIG. 4 is a flowchart showing a process of releasing exclusive resources in the resource exclusive control system shown in FIG.

FIG. 5 is a diagram for explaining a specific operation of the resource exclusive control system shown in FIG.

FIG. 6 is a block diagram showing the configuration of a second embodiment of the resource exclusive control system of the present invention.

FIG. 7 is a flowchart showing processing at the end of the process in the resource exclusive control method shown in FIG.

FIG. 8 is a diagram for explaining a specific operation of the resource exclusive control method shown in FIG.

[Explanation of symbols]

 10 process group 11 process 20 exclusive control device 21 resource registration means 22 resource acquisition means 23 resource release means 24 resource registration control means 25 resource exclusive control means 30 storage device 31 exclusive resource management table 32 resource queuing management table 33 process management table 40 0S Basic part 41 Process management means

Claims (3)

[Claims] 1. A process group that is a set of processes that exclusively use resources, a "resource name" indicating the name of the exclusive resource, and a "resource acquisition state" that manages the acquisition state of the exclusive resource for each exclusive resource. An exclusive resource management table in a storage device having a "resource acquisition process ID" indicating a process ID of a process acquiring an exclusive resource, and "resource waiting process management information" for managing a process waiting for an exclusive resource; A process management table in a storage device that stores the process ID of the generated process, and a registration request for an exclusive resource that is notified by specifying an arbitrary resource name from a process in the process group, and registers the process in the process. Resource registration means for returning a resource registration success notification / resource registration failure notification in response to the request; A resource registration control unit that accesses the other resource management table and registers the resource name of the exclusive resource related to the registration request in the exclusive resource management table; and the resource name registered by the resource registration control unit is designated in the process group. The resource acquisition means for receiving the exclusive resource acquisition request notified from the process, and returning the resource acquisition success notification / resource acquisition failure notification to the acquisition request to the process, and the resource name registered by the resource registration control means. A resource releasing unit that receives an exclusive resource release request notified from a process in the specified process group and returns a resource release success notification / resource release failure notification in response to the release request to the process, the resource acquisition unit, and The exclusive resource management table is accessed by the notification from the resource releasing means, and the specified resource name And a process management unit that creates a process management table for the process when the process is created and manages the process by the process management table. Resource exclusion control method. 2. A process management table for storing an exclusive resource acquisition flag for a process ID, and an exclusive resource of the process management table for a process acquired on the basis of a notification from the resource exclusion control means at the time of acquisition of an exclusive resource. The acquisition flag is set, the exclusive resource acquisition flag of the process management table for the process that has released the exclusive resource based on the notification from the resource exclusion control means is cleared, and the process management for the process is completed when a certain process ends. Based on the process management means for notifying the resource exclusion control means of the process ID of the process when the exclusive resource acquisition flag in the table is set, and the notification of the process ID from the process management means at the end of a certain process Exclusive acquired by the process 2. The resource exclusion control means for performing control for retrieving a resource from the exclusive resource management table and releasing the exclusive resource that has been acquired by the process. Exclusive control method. 3. The resource queuing management table that stores the process ID of the process in the process of resource queuing, and the address of the next resource queuing management table in the resource queuing queue by the next pointer, and Address of the resource queuing management table at the head of the resource queuing queue "and" the fact that the resource queuing management table forming the resource queuing queue does not exist "
3. The resource exclusion control method according to claim 1 or 2, further comprising: the exclusive resource management table having "resource queuing process management information" having any of the above.