CN101430655A - Method and apparatus for simulating global sharing memory - Google Patents
Method and apparatus for simulating global sharing memory Download PDFInfo
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- CN101430655A CN101430655A CNA2008102268809A CN200810226880A CN101430655A CN 101430655 A CN101430655 A CN 101430655A CN A2008102268809 A CNA2008102268809 A CN A2008102268809A CN 200810226880 A CN200810226880 A CN 200810226880A CN 101430655 A CN101430655 A CN 101430655A
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Abstract
The invention discloses a method for simulating a global shared memory and a device thereof, and belongs to the field of shared memories. The method comprises the following steps: a process creates a shared memory with a predetermined name in a session in which the process is present; the process lists other sessions in a system; the process opens the shared memories with the predetermined names in the other sessions; and the process copies the contents in the shared memories with the predetermined names in the other sessions to the shared memory with the predetermined name in the session. The device comprises a session management module and a shared memory management module. By creating a simulated global shared memory, the method facilitates data interaction by the shared memory without services among various processes, which effectively solves the problem of the difficult data interaction in various sessions and among various sessions in an operating system.
Description
Technical field
The present invention relates to the shared drive field, particularly a kind of method and apparatus of simulating global sharing memory.
Background technology
Shared drive is the common technology of Inter-Process Communication, also is the most useful mode of interprocess communication.Because process can the direct read internal memory, and without any need for the copy of data, therefore adopting a conspicuous benefit of shared drive communication is exactly the efficient height, shared drive only need copy two secondary data: once from input file to the shared drive district, another time from the shared drive district to output file.And, then need carry out four times copying data at kernel and user's space for communication modes such as image tube road, message queues.
In practical operation, when using shared drive, always behind the read-write low volume data, just do not remove mapping between the process, rebulid the shared drive zone when waiting new communication again, but keep shared region, till interprocess communication finishes.Because the content in the shared drive just writes back file often when removing mapping, therefore, keep shared region to finish until interprocess communication, data content will be kept in the shared drive before removing mapping always, did not write back file.If shared drive is the mapping of system's pagefile, even do not need so to carry out all being the exchanges data between the internal memory alternately with disk file, more efficient.
At present, in the part operation system of computer, such as Windows XP and after introduced the notion of session (Session) on the operating system of Windows.When each user logins, created a session simultaneously, each process all is associated with a unique session, promptly operates in this session.Wish to visit same shared drive when reaching the purpose of data interaction when the process of a plurality of processes of same session or different sessions, this shared drive all must be visible for each process, and can visit.Shared drive generally speaking all is a global sharing memory, adds " Global " when promptly creating before title, and this shared drive is present in " session 0 ".
But, owing to introduced " session 0 " isolation technology in some operation system of computer (as in Vista operating system)." session 0 " isolation technology is specially: only have application services in " session 0 ", the process of operation all must be system (System) authority in " session 0 ", and the program that the user logins back operation all must be in other session, and the process of user's operation all is domestic consumer's authority.This moment, domestic consumer's process just can't be created global sharing memory simply owing to the restriction of authority.Certainly, if use service, still can create global sharing memory, but again general fairly simple program is brought the complicacy of management:, introduce a service and then must introduce the process of installing and register the complexity of this service such as writing shared library (DLL) program that to use global sharing memory.
Summary of the invention
Carry out data interaction in order to make between each process by shared drive, the embodiment of the invention provides a kind of method and apparatus of simulating global sharing memory.Described technical scheme is as follows:
A kind of method of simulating global sharing memory comprises:
Process is created the shared drive of the title of making an appointment in the session at its place;
Described process is enumerated other sessions in the system;
Described process is opened the shared drive of the title of making an appointment in described other sessions;
Described process is made an appointment the content replication in the shared drive of the title of making an appointment in described other sessions in the described session in the shared drive of title.
Described process is created the shared drive of the title of making an appointment in the session at its place, specifically comprise:
When not having the shared drive of the described title of making an appointment in the session at described process place, described process is created the shared drive of the described title of making an appointment in the session at its place.
Described process is created the shared drive of the title of making an appointment in the session at its place, specifically comprise:
Described process is opened overall mutex, and obtains the locking power of described overall mutex;
Then, described process is created the shared drive of the described title of making an appointment in the session at its place.
Described method also comprises:
Described process judges whether to exist described overall mutex;
If there is not the described overall mutex of then described process creation;
If exist, then described process is directly opened described overall mutex;
Described method also comprises:
After content replication in described process is made an appointment the shared drive of title in described other sessions was made an appointment in the shared drive of title in described session, described process discharged the locking power of described overall mutex.
After content replication in described process is made an appointment the shared drive of title in described other sessions was made an appointment in the shared drive of title in described session, described method also comprised:
Described process is revised the content of the shared drive of the title of making an appointment in the session at its place;
Described process is enumerated other sessions in the system;
Described process is opened the shared drive of the title of making an appointment in described other sessions;
Described process is made an appointment the content replication in the shared drive of the title of making an appointment in the described session in described other sessions in the shared drive of title.
Described process is revised the content of the shared drive of the title of making an appointment in the session at its place, specifically comprises:
Described process is opened overall mutex, and obtains the locking power of described overall mutex;
Then, described process is revised the content of the shared drive of the title of making an appointment in the session at its place.
Described method also comprises:
Described process judges whether to exist described overall mutex;
If there is not the described overall mutex of then described process creation;
If exist, then described process is directly opened described overall mutex;
Described method also comprises:
After content replication in described process is made an appointment the shared drive of title in described session was made an appointment in the shared drive of title in described other sessions, described process discharged the locking power of described overall mutex.
The described name of making an appointment is called the title of arranging mutually between the process of visiting same shared drive.
A kind of device of simulating global sharing memory comprises: session management module and shared drive administration module;
Described session management module comprises:
Enumerate the unit, be used for other sessions that process is enumerated system;
Described shared drive administration module comprises:
Creating unit is used for described process is created the title of making an appointment in the session at its place shared drive;
Open the unit, be used for described process and open and the corresponding shared drive of described other sessions;
Copied cells is used for described process make an appointment content replication in the shared drive of title of described other sessions is made an appointment in the described session in the shared drive of title.
Described creating unit specifically is used for:
When not having the shared drive of the described title of making an appointment in the session at described process place, described process is created the shared drive of the title of making an appointment in the session at its place.
Described device also comprises: the mutex administration module;
Described mutex administration module comprises:
Judging unit is used for described process and judges whether to exist overall mutex;
Creating unit is used for if the judged result of described judging unit is not for existing described overall mutex, the described overall mutex of described process creation;
Acquiring unit is used for described process and opens described overall mutex, and obtains the locking power of described overall mutex;
Correspondingly, the described creating unit in the described shared drive administration module specifically is used for:
After described process is obtained the locking power of described overall mutex, in the session at its place, create the shared drive of the title of making an appointment.
Described mutex administration module also comprises:
Releasing unit, be used for described copied cells in described Sharing Management module and make an appointment in described session after content replication in the shared drive of title makes an appointment in the shared drive of title in described other sessions, described process discharges the locking power of described overall mutex.
Described shared drive administration module also comprises:
Revise the unit, be used for process and revise the make an appointment content of shared drive of title of the session at its place;
Correspondingly,
Described copied cells also is used for described process make an appointment content replication in the shared drive of title of the amended described session in described modification unit is made an appointment in described other sessions in the shared drive of title.
The described name of making an appointment is called the title of arranging mutually between the process of visiting same shared drive.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is:
By in the middle of each session of system, creating the shared drive of same names, and with the content replication in these shared drives in the shared drive of each same names, create a kind of simulation global sharing memory, making does not need to adopt service just can carry out data interaction by shared drive between each process, efficiently solve the problem of data interaction difficulty between the process that reaches in each session in the operating system between each session, make domestic consumer's process also can create and use global sharing memory.
Description of drawings
Fig. 1 is the creation method process flow diagram of the simulation global sharing memory that provides in the embodiment of the invention 1;
Fig. 2 is the update method process flow diagram of the simulation global sharing memory that provides in the embodiment of the invention 1;
Fig. 3 is the apparatus structure synoptic diagram of the simulation global sharing memory that provides in the embodiment of the invention 2;
Fig. 4 is the apparatus structure synoptic diagram of the another kind simulation global sharing memory that provides in the embodiment of the invention 2;
Fig. 5 is the structural representation of the mutex administration module that provides in the embodiment of the invention 2;
Fig. 6 is the structural representation of the shared drive administration module that provides in the embodiment of the invention 2.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Embodiment 1
Referring to Fig. 1, present embodiment provides a kind of method of simulating global sharing memory, and this method comprises:
Step 101: process is judged the shared drive that whether has the title of making an appointment in the session at its place;
If there is no, execution in step 102;
If exist, withdraw from;
Step 102: process judges whether to exist overall mutex MutexT;
If there is no, execution in step 103 then;
If exist, then execution in step 104.
Step 103: process creation overall situation mutex MutexT;
Step 104: process is opened overall mutex MutexT, and waits for the locking power of obtaining this overall situation mutex MutexT;
Step 105: process is obtained the locking power of this overall situation mutex MutexT, creates the shared drive of the title of making an appointment in its place session;
Step 106: process is enumerated other session column that exist in the system come;
Step 107: the shared drive of the title of making an appointment of one of them session of enumerating in the session that obtains is opened in the process trial;
If open failure, then execution in step 108;
If open success, then execution in step 110;
Step 108: process judges whether that every other session all attempted opening;
If not, then execution in step 109;
If then execution in step 111;
Step 109: the shared drive of the title of making an appointment of another session of enumerating in the session that obtains is opened in the process trial;
If failure, then execution in step 108;
If success, then execution in step 110;
Step 110: after process is made an appointment in its place session the content replication of the shared drive of the title of making an appointment in the session of successfully opening in the shared drive of title, execution in step 111;
Step 111: process discharges the locking power of overall mutex MutexT;
For example, there are three sessions under the Vista operating system, are respectively Session1, Session2 and Session3; The name of the shared drive of making an appointment between the process by the same shared drive of visit in these three sessions is called ShareMemoryName, supposes not exist among the Session1 name to be called the shared drive of ShareMemoryName.With the process A among the Session1 is example: the process A among the Session1 judges the shared drive that does not exist name to be called ShareMemoryName among the Session1; Create overall mutex MutexT, and open overall mutex MutexT, obtain the locking power of overall mutex MutexT; Create the shared drive that name is called ShareMemoryName; Open among the Session2 shared drive that name is called ShareMemoryName, the content replication of the inside name in the Session1 is called in the shared drive of ShareMemoryName; Discharge the locking power of overall mutex MutexT.
Further, referring to Fig. 2, after step 110, this method also comprises:
Step 201: process judges whether to exist overall mutex MutexT;
If do not exist, then execution in step 202;
If exist, then execution in step 203;
Step 202: process creation overall situation mutex MutexT;
Step 203: process is opened overall mutex MutexT, and waits for the locking power of obtaining this overall situation mutex MutexT;
Step 204: process gets access to the locking power of overall mutex MutexT, revises the content in the shared drive of the title of making an appointment in its place session;
Step 205: process is enumerated other session column that exist in the system come;
Step 206: the shared drive of the title of making an appointment of one of them session of enumerating in the session that obtains is opened in the process trial;
If open success, then execution in step 207;
If open failure, then execution in step 208;
Step 207: after the content replication of the shared drive of the title of making an appointment in the session of process with its place is made an appointment in other sessions of successfully opening in the shared drive of title, execution in step 208;
Step 208: process judges whether that every other session all attempted opening;
If not, then execution in step 209;
If then execution in step 210;
Step 209: the shared drive of the title of making an appointment of another session of enumerating in the session that obtains is opened in the process trial;
If success, then execution in step 207;
If failure, then execution in step 208;
Step 210: process discharges the locking power of mutex MutexT.
For example, there are three sessions under the Vista operating system, are respectively Session1, Session2 and Session3; The name of the shared drive of making an appointment between the process by the same shared drive of visit in these three sessions is called ShareMemoryName, suppose that process A among the Session1 prepare to revise the content in the shared drive that name among its place session Session1 is called ShareMemoryName: the process A among the Session1 creates overall mutex MutexT, and open overall mutex MutexT, obtain the locking power of overall mutex MutexT; Revise the content in the shared drive that name among the Session1 is called ShareMemoryName; Open among the Session2 shared drive that name is called ShareMemoryName, the content replication name in the Session2 that name among the Session1 is called in the shared drive of ShareMemoryName is called in the shared drive of ShareMemoryName; Open among the Session3 shared drive that name is called ShareMemoryName, the content replication name in the Session3 that name among the Session1 is called in the shared drive of ShareMemoryName is called in the shared drive of ShareMemoryName; Discharge the locking power of overall mutex MutexT.
Here need to prove: if the process in two sessions needs simultaneously to create or upgrades the simulation global sharing memory, the process that then obtains the locking power of mutex MutexT is earlier carried out its step earlier, and another process need be waited for the locking power of obtaining mutex MutexT.
The embodiment of the invention is by creating the shared drive of same names in the middle of each session of system, and with the content replication in these shared drives in the shared drive of each same names, create a kind of simulation global sharing memory, making does not need to adopt service just can carry out data interaction by shared drive between each process, efficiently solve the problem of data interaction difficulty between the process that reaches in each session in the operating system between each session, make domestic consumer's process also can create and use global sharing memory, make domestic consumer's process also can create and use global sharing memory.
Embodiment 2
Referring to Fig. 3, the embodiment of the invention provides a kind of device 300 of simulating global sharing memory, comprising: session management module 301 and shared drive administration module 302;
Session management module 301 comprises:
Shared drive administration module 302 comprises:
Creating unit 302A is used for process is created the title of making an appointment in the session at its place shared drive;
Copied cells 302C is used for process make an appointment content replication in the shared drive of title of other sessions is made an appointment in the session in the shared drive of title.
Wherein, creating unit 302A specifically is used for:
When not having the shared drive of the title of making an appointment in the session at process place, process is created the shared drive of the title of making an appointment in the session at its place.
Further, referring to Fig. 4, device 300 also comprises: mutex administration module 303;
Mutex administration module 303 comprises:
Judging unit 303A is used for process and judges whether to exist overall mutex;
Creating unit 303B is used for if the judged result of judging unit 303A is not for existing overall mutex, process creation overall situation mutex;
Acquiring unit 303C is used for process and opens overall mutex, and obtains the locking power of overall mutex;
Correspondingly, the creating unit 302A in the shared drive administration module 302 specifically is used for:
After process is obtained the locking power of overall mutex, in the session at its place, create the shared drive of the title of making an appointment.
Further, referring to Fig. 5, mutex administration module 303 also comprises:
Releasing unit 303D, be used for copied cells 302C in Sharing Management module 302 and make an appointment in session after content replication in the shared drive of title makes an appointment in the shared drive of title in other sessions, process discharges the locking power of overall mutex.
Further, referring to Fig. 6, shared drive administration module 302 also comprises:
Revise unit 302D, be used for first process and revise the make an appointment content of shared drive of title of the session at its place;
Correspondingly,
Copied cells 302C also is used for first process will be revised make an appointment content replication in the shared drive of title of the amended session of unit 302D and make an appointment in other sessions in the shared drive of title.
Wherein, the name of making an appointment is called between the process of visit same shared drive a title of arranging mutually.
The device of embodiment of the invention utilization simulation global sharing memory, realized in the middle of each session of system, creating the shared drive of same names, and with the content replication in these shared drives in the shared drive of each same names, create a kind of simulation global sharing memory, making does not need to adopt service just can carry out data interaction by shared drive between each process, efficiently solve the problem of data interaction difficulty between the process that reaches in each session in the operating system between each session, make domestic consumer's process also can create and use global sharing memory, make domestic consumer's process also can create and use global sharing memory.
The embodiment of the invention can utilize software to realize that corresponding software programs can be stored in the storage medium that can read, for example, and in the hard disk of router, buffer memory or the CD.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1, a kind of method of simulating global sharing memory is characterized in that, described method comprises:
Process is created the shared drive of the title of making an appointment in the session at its place;
Described process is enumerated other sessions in the system;
Described process is opened the shared drive of the title of making an appointment in described other sessions;
Described process is made an appointment the content replication in the shared drive of the title of making an appointment in described other sessions in the described session in the shared drive of title.
2, the method for simulation global sharing memory as claimed in claim 1 is characterized in that, described process is created the shared drive of the title of making an appointment in the session at its place, specifically comprise:
When not having the shared drive of the described title of making an appointment in the session at described process place, described process is created the shared drive of the described title of making an appointment in the session at its place.
3, the method for simulation global sharing memory as claimed in claim 1 is characterized in that, described process is created the shared drive of the title of making an appointment in the session at its place, specifically comprise:
Described process is opened overall mutex, and obtains the locking power of described overall mutex;
Then, described process is created the shared drive of the described title of making an appointment in the session at its place.
4, the method for simulation global sharing memory as claimed in claim 3 is characterized in that, before described process was opened overall mutex, described method also comprised:
Described process judges whether to exist described overall mutex;
If there is not the described overall mutex of then described process creation;
If exist, then described process is directly opened described overall mutex.
5, the method for simulation global sharing memory as claimed in claim 3 is characterized in that, described method also comprises:
After content replication in described process is made an appointment the shared drive of title in described other sessions was made an appointment in the shared drive of title in described session, described process discharged the locking power of described overall mutex.
6, the method for simulation global sharing memory as claimed in claim 1, it is characterized in that, after content replication in described process is made an appointment the shared drive of title in described other sessions was made an appointment in the shared drive of title in described session, described method also comprised:
Described process is revised the content of the shared drive of the title of making an appointment in the session at its place;
Described process is enumerated other sessions in the system;
Described process is opened the shared drive of the title of making an appointment in described other sessions;
Described process is made an appointment the content replication in the shared drive of the title of making an appointment in the described session in described other sessions in the shared drive of title.
7, the method for simulation global sharing memory as claimed in claim 6 is characterized in that, described process is revised the content of the shared drive of the title of making an appointment in the session at its place, specifically comprises:
Described process is opened overall mutex, and obtains the locking power of described overall mutex;
Then, described process is revised the content of the shared drive of the title of making an appointment in the session at its place.
8, the method for simulation global sharing memory as claimed in claim 7 is characterized in that, described process is opened before the overall mutex, and described method also comprises:
Described process judges whether to exist described overall mutex;
If there is not the described overall mutex of then described process creation;
If exist, then described process is directly opened described overall mutex.
9, the method for simulating global memory as claimed in claim 7 is characterized in that described method also comprises:
After content replication in described process is made an appointment the shared drive of title in described session was made an appointment in the shared drive of title in described other sessions, described process discharged the locking power of described overall mutex.
As the method for the described simulation global sharing memory of each claim in the claim 1 to 9, it is characterized in that 10, the described name of making an appointment is called the title of arranging mutually between the process of visiting same shared drive.
11, a kind of device of simulating global sharing memory is characterized in that, described device comprises: session management module and shared drive administration module;
Described session management module comprises:
Enumerate the unit, be used for other sessions that process is enumerated system;
Described shared drive administration module comprises:
Creating unit is used for described process is created the title of making an appointment in the session at its place shared drive;
Open the unit, be used for described process and open and the corresponding shared drive of described other sessions;
Copied cells is used for described process make an appointment content replication in the shared drive of title of described other sessions is made an appointment in the described session in the shared drive of title.
12, the device of simulation global sharing memory as claimed in claim 11 is characterized in that, described creating unit specifically is used for:
When not having the shared drive of the described title of making an appointment in the session at described process place, described process is created the shared drive of the title of making an appointment in the session at its place.
13, the device of simulation global sharing memory as claimed in claim 11 is characterized in that, described device also comprises: the mutex administration module;
Described mutex administration module comprises:
Judging unit is used for described process and judges whether to exist overall mutex;
Creating unit is used for if the judged result of described judging unit is not for existing described overall mutex, the described overall mutex of described process creation;
Acquiring unit is used for described process and opens described overall mutex, and obtains the locking power of described overall mutex;
Correspondingly, the described creating unit in the described shared drive administration module specifically is used for:
After described process is obtained the locking power of described overall mutex, in the session at its place, create the shared drive of the title of making an appointment.
14, the device of simulation global sharing memory as claimed in claim 13 is characterized in that, described mutex administration module also comprises:
Releasing unit, be used for described copied cells in described Sharing Management module and make an appointment in described session after content replication in the shared drive of title makes an appointment in the shared drive of title in described other sessions, described process discharges the locking power of described overall mutex.
15, the device of simulation global sharing memory as claimed in claim 11 is characterized in that, described shared drive administration module also comprises:
Revise the unit, be used for process and revise the make an appointment content of shared drive of title of the session at its place;
Correspondingly,
Described copied cells also is used for described process make an appointment content replication in the shared drive of title of the amended described session in described modification unit is made an appointment in described other sessions in the shared drive of title.
As the device of the described simulation global sharing memory of each claim in the claim 11 to 15, it is characterized in that 16, the described name of making an appointment is called the title of arranging mutually between the process of visiting same shared drive.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103425592A (en) * | 2013-08-05 | 2013-12-04 | 大唐移动通信设备有限公司 | Memory management method and device for multiprocess system |
| CN106790027A (en) * | 2016-12-15 | 2017-05-31 | 国家计算机网络与信息安全管理中心 | The multi-tenant Dropbox right management method and system of HDFS file system |
| CN114138419A (en) * | 2021-12-07 | 2022-03-04 | 北京睿芯高通量科技有限公司 | Openresty-based cross-type inter-service data sharing method and system |
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2008
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103425592A (en) * | 2013-08-05 | 2013-12-04 | 大唐移动通信设备有限公司 | Memory management method and device for multiprocess system |
| CN103425592B (en) * | 2013-08-05 | 2016-08-10 | 大唐移动通信设备有限公司 | EMS memory management process in a kind of multiprocess system and device |
| CN106790027A (en) * | 2016-12-15 | 2017-05-31 | 国家计算机网络与信息安全管理中心 | The multi-tenant Dropbox right management method and system of HDFS file system |
| CN106790027B (en) * | 2016-12-15 | 2020-09-11 | 国家计算机网络与信息安全管理中心 | Multi-tenant network disk authority management method and system of HDFS file system |
| CN114138419A (en) * | 2021-12-07 | 2022-03-04 | 北京睿芯高通量科技有限公司 | Openresty-based cross-type inter-service data sharing method and system |
| CN114138419B (en) * | 2021-12-07 | 2022-09-23 | 北京睿芯高通量科技有限公司 | Openresty-based cross-type inter-service data sharing method and system |
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| CN101430655B (en) | 2011-12-28 |
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