CN105760217A - Method for accessing shared memory - Google Patents
Method for accessing shared memory Download PDFInfo
- Publication number
- CN105760217A CN105760217A CN201610167111.0A CN201610167111A CN105760217A CN 105760217 A CN105760217 A CN 105760217A CN 201610167111 A CN201610167111 A CN 201610167111A CN 105760217 A CN105760217 A CN 105760217A
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- Prior art keywords
- visitor
- access
- authority
- interface
- shared drive
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/468—Specific access rights for resources, e.g. using capability register
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/54—Interprogram communication
- G06F9/544—Buffers; Shared memory; Pipes
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- Engineering & Computer Science (AREA)
- Software Systems (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Storage Device Security (AREA)
Abstract
The invention relates to a method for accessing a shared memory. The method comprises the following steps of: calling an access interface by a visitor; checking an authority registry by an authority checking program to check an interface authority for the visitor; if checking is passed, calling the interface and returning results and ending; if the checking is not passed, returning errors and ending. The patent of the invention ensures the safety and consistency of a shared memory data access by setting the visitor authority.
Description
Technical field
Shared drive process field of the present invention, particularly to a kind of method accessing shared drive.
Background technology
Shared drive refers to that (sharedmemory) is in the computer system of multiprocessor, it is possible to the Large Copacity internal memory accessed by different central processing units (CPU).Shared drive is the communication means between the multi-process under Unix, and this method is generally used between the multi-process of a program communication, can also transmit information by shared drive between actually multiple programs.Owing to shared drive concurrently can be accessed by multiple cpu or multiple process; but not to visitor's control of authority in addition; this can cause that visitor can have all of access right, thus the access behavior of uncontrollable visitor, is unfavorable for the data in shared drive are protected by.Such as, Data Consistency occurs.
The traditional method solving such problem is to adopt lock mechanism, namely locks as shown in Figure 1 to shared drive: first visitor to obtain the lock of this section of shared drive, then just can carry out data access；When a process has obtained this lock, other visitor must wait in line, until lock is released, other processes could obtain this lock from new, and carries out data access.
But no matter adopt what kind of lock, this lock all can become the efficiency bottle neck that shared drive accesses: in time having a lot of visitor to access simultaneously, a visitor can only be had to obtain lock and conduct interviews, and other visitors must wait in line, thus causing that access efficiency is greatly cut down.As shown in Figure 1.
The method comprises the following steps:
First, visitor calls shared drive access interface.
Then, attempt obtaining the access lock of shared drive, if got, then perform interface interchange and carry out shared drive access and return result.If do not got, wait this lock.
Traditional locks mechanism many visitors are when concurrently accessing shared drive data, the efficiency bottle neck of formation as shown in Figure 2:
Each visitor accesses shared drive simultaneously.
Each visitor competes acquisition shared drive and accesses lock.
Obtain the visitor accessing lock and perform access interface backward reference result.
The visitor not obtaining lock then waits in line this lock, until getting this lock, and performs step C.
Data in shared drive as long as visitor gets corresponding lock, still can be carried out any operation, so the Information Security in internal memory still can not be guaranteed by the access behavior of the same uncontrollable visitor of traditional locks mechanism simultaneously.
So, shared drive accesses and accesses protective measure and there is several big defect, it may be assumed that the authority of visitor is not unrestricted, is easily caused various data safety and Data Consistency；Traditional locks protection mechanism is adopted to easily cause access efficiency bottleneck problem.
Summary of the invention
The present invention is directed to shared drive access and namely access protective measure exists several big defect: the authority of visitor is not unrestricted, is easily caused various data safety and Data Consistency；Traditional locks protection mechanism is adopted to easily cause access efficiency bottleneck problem.Propose to adopt the method giving different rights to the visitor of shared drive, effectively solve and avoid above-mentioned several big problem.
The technical scheme is that a kind of method accessing shared drive, comprise the following steps:
Step 1, visitor call access interface；
Step 2, scope check program checkout visitor's authority registration table, carry out interface authority inspection to visitor；This visitor's registration table mainly comprises three parts: visitor's mark and id, corresponding access rights, and the access interface information of correspondence.
Step 3, inspection are passed through, then visitor performs interface interchange and returns result, terminate；Check and do not pass through, directly return mistake, terminate.
Patent of the present invention puts the person's of asking authority by setting, it is ensured that the safety of shared drive data access and concordance.
So, each visitor is made directly data access at any time according to self chartered authority, without waiting for other visitor, avoids the loss in efficiency that lock mechanism brings, ensure that the access efficiency to shared drive, can ensure that access efficiency is not by any loss in theory.
Owing to Accessor Access's authority has been arranged, make visitor can not access shared drive with unlimited authority, and only can carry out the access having permission, thereby may be ensured that the safety to data access and concordance.
Below with reference to drawings and Examples, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is for illustrating to implement the flow process of traditional locks mechanism Accessor Access's shared drive data.
When Fig. 2 is used for illustrating that implementing the traditional locks many visitors of mechanism concurrently accesses shared drive data, the efficiency bottle neck situation of formation.
Fig. 3 is used for the concrete assembly ingredient of the present invention is described.
Fig. 4 is for illustrating the flow process of Accessor Access's shared drive data of the present invention.
Fig. 5 is used for illustrating that the many visitors of the present invention concurrently access shared drive data, can the situation of concurrent access.
Detailed description of the invention
Embodiment 1, the present embodiment is a kind of method that shared drive is conducted interviews, and in the method, initialization program each visitor sets up in shared drive an authority registration table in advance, record the access rights of shared drive, as: definition read right/write permission.
Operation (retrieval/storage etc.) interface of shared drive, as: definition reading interface/write interface.
The authority register list of each visitor, specifies the access rights that each process has in the list.
Visitor's scope check and access control.According to the authority that authority register list gives, control the access behavior of visitor.The access that visitor can only perform to have permission is done and is called and operates interface accordingly；When visitor performs the access interface operating or calling lack of competence of lack of competence, return corresponding mistake.
Implementing of Accessor Access's control of authority can there be is various ways, as: during calling interface, visitor is carried out scope check；Or initialize it according to visitor's permissions list and access operation interface list, and such table is mapped in the memory headroom of visitor, thus limiting visitor can only effectively operate these initialized interfaces etc..
The data safety focusing on solution shared drive access mode existence of the real-time example of the present invention and inconsistence problems, and the efficiency bottle neck problem that traditional locks access protection mechanism is brought.
It is critical only that this invention is implemented gives specific access rights to each visitor of shared drive, and this authority can be registered in initialization procedure by program in authority registration table；Can also provide interface, user choosing the right moment as required carries out concrete configuration.Wherein visitor refers to need all process visitors that specified permission accesses shared drive first to be carried out scope check by scope check program according to authority registration table when accessing, by the access behavior of control of authority visitor, guarantee data access safety and concordance, and may insure that the access efficiency of data is seldom impaired simultaneously.
As, by the program of initialization, or by user by calling certain interface, can only give visitor's write permission, give other visitor's read rights,.For the access of shared drive, owing to being actually, at hardware view, (internal storage access bus simultaneously can only by the cpu/ Process flowchart) that serial performs, so not havinging not only situation that synchronization is read but also write, it may be assumed that read/write is that serial performs；Owing to only one of which process has write permission, so do not have the problem that multiple process writes one section of shared drive simultaneously.Thus ensureing that data will not be write unrest, safety and the concordance of sharing data are protected.
Owing to not adopting lock mechanism, each visitor can directly access data at any time, it is not necessary to waits other visitor, so access efficiency will not be subject to any loss in theory.
The concrete component software ingredient of the embodiment of the present invention is as it is shown on figure 3, specifically include that
Visitor's authority registration table, it is the core of whole software architecture.This table is by process authority registration entries, and wherein each registration entries entry deposits the access rights of a registered access person (namely each accesses process) and correspondence thereof.
Scope check module (scope check program), for queried access person's authority registration table, and according to Query Result, decides whether to perform to visit interface.It is obvious that if it is determined that success then illustrates that visitor has corresponding authority, is carried out interface；Otherwise do not perform.
Authority, represents the access rights of visitor, and it is corresponding with concrete access interface.When a visitor has certain authority, illustrate that this visitor can perform corresponding access interface.Authority and visitor, corresponding access interface corresponding relation record in visitor's authority registration table.
Interface, is access shared drive and return the concrete function of result, corresponding with authority, the function finally called when being Accessor Access's internal memory with corresponding access rights.
Depositing the shared drive memory area of concrete data, it is exactly access the object being required for accessing.
The flow chart of the present embodiment Accessor Access's shared drive data is as shown in Figure 4: comprise the following steps.
Step 1, visitor call access interface；Visitor is exactly the process needing to access shared drive.
Step 2, scope check program checkout visitor's authority registration table, carry out interface authority inspection to visitor；This visitor's registration table mainly comprises three parts: visitor's mark and id, corresponding access rights, and the access interface information of correspondence.
Step 3, inspection are passed through, then visitor performs interface interchange and returns result, terminate；Check and do not pass through, directly return mistake, terminate.Shared drive is conducted interviews, mainly has read and write, if visitor has the authority write, then directly shared drive is carried out write operation, otherwise can not carry out write operation.When practical application, only one of which visitor has the authority write, and other, visitor only has the authority of reading.
It is illustrated in figure 5 many visitors and concurrently accesses shared drive data, can the situation of concurrent access.
Each visitor independently calls shared drive access interface simultaneously.
The access rights of scope check module each visitor of independent check.
The visitor that scope check passes through calls access interface and performs access backward reference result.
Claims (4)
1. the method accessing shared drive, it is characterised in that: comprise the following steps:
Step 1, visitor call access interface；
Step 2, scope check program checkout visitor's authority registration table, carry out interface authority inspection to visitor；
Step 3, inspection are passed through, then visitor performs interface interchange and returns result, terminate；Check and do not pass through, directly return mistake, terminate.
2. the method for access shared drive according to claim 1, it is characterised in that: described authority registration table comprises: visitor's mark and id, corresponding access rights, and the access interface information of correspondence.
3. the method for access shared drive according to claim 1, it is characterized in that: the authority carrying out in interface authority inspection to visitor in step 2 is registered in initialization procedure by program in authority registration table, representing the access rights of visitor, it is corresponding with concrete access interface.
4. the method for access shared drive according to claim 3, it is characterized in that: described interface is to access shared drive and return the concrete function of result, function that is corresponding with authority, that finally call when being Accessor Access's internal memory with corresponding access rights.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610167111.0A CN105760217A (en) | 2016-03-23 | 2016-03-23 | Method for accessing shared memory |
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| CN201610167111.0A CN105760217A (en) | 2016-03-23 | 2016-03-23 | Method for accessing shared memory |
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| CN201610167111.0A Pending CN105760217A (en) | 2016-03-23 | 2016-03-23 | Method for accessing shared memory |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107368736A (en) * | 2017-07-03 | 2017-11-21 | 青岛海信电器股份有限公司 | Information access method, device and computer-readable recording medium |
| CN107664978A (en) * | 2016-07-27 | 2018-02-06 | 发那科株式会社 | Programmable controller |
| CN109413432A (en) * | 2018-07-03 | 2019-03-01 | 北京中科睿芯智能计算产业研究院有限公司 | Multi-process coding method, system and device based on event and shared drive mechanism |
| CN109472124A (en) * | 2018-10-11 | 2019-03-15 | 平安科技（深圳）有限公司 | Matching process, device, equipment and the medium of interface access right |
| CN110928701A (en) * | 2018-09-20 | 2020-03-27 | 北京君正集成电路股份有限公司 | Communication registration method and device |
| CN111638968A (en) * | 2019-03-01 | 2020-09-08 | 维塔科技(北京)有限公司 | Shared memory access permission setting method and device, electronic equipment and storage medium |
| US11487258B2 (en) | 2016-09-09 | 2022-11-01 | Hitachi Industrial Equipment Systems Co., Ltd. | Controller and control management system |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107664978A (en) * | 2016-07-27 | 2018-02-06 | 发那科株式会社 | Programmable controller |
| CN107664978B (en) * | 2016-07-27 | 2019-06-07 | 发那科株式会社 | Programmable controller |
| US11487258B2 (en) | 2016-09-09 | 2022-11-01 | Hitachi Industrial Equipment Systems Co., Ltd. | Controller and control management system |
| CN107368736A (en) * | 2017-07-03 | 2017-11-21 | 青岛海信电器股份有限公司 | Information access method, device and computer-readable recording medium |
| CN107368736B (en) * | 2017-07-03 | 2020-06-09 | 海信视像科技股份有限公司 | Information access method, device and computer readable storage medium |
| CN109413432A (en) * | 2018-07-03 | 2019-03-01 | 北京中科睿芯智能计算产业研究院有限公司 | Multi-process coding method, system and device based on event and shared drive mechanism |
| CN109413432B (en) * | 2018-07-03 | 2023-01-13 | 北京中科睿芯智能计算产业研究院有限公司 | Multi-process coding method, system and device based on event and shared memory mechanism |
| CN110928701A (en) * | 2018-09-20 | 2020-03-27 | 北京君正集成电路股份有限公司 | Communication registration method and device |
| CN109472124A (en) * | 2018-10-11 | 2019-03-15 | 平安科技（深圳）有限公司 | Matching process, device, equipment and the medium of interface access right |
| CN109472124B (en) * | 2018-10-11 | 2022-12-30 | 平安科技（深圳）有限公司 | Method, device, equipment and medium for matching interface use permission |
| CN111638968A (en) * | 2019-03-01 | 2020-09-08 | 维塔科技(北京)有限公司 | Shared memory access permission setting method and device, electronic equipment and storage medium |
| CN111638968B (en) * | 2019-03-01 | 2024-03-15 | 维塔科技(北京)有限公司 | Shared memory access authority setting method and device, electronic equipment and storage medium |
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Application publication date: 20160713 |