CN109976764A - A kind of handle conversion method - Google Patents
A kind of handle conversion method Download PDFInfo
- Publication number
- CN109976764A CN109976764A CN201910243866.8A CN201910243866A CN109976764A CN 109976764 A CN109976764 A CN 109976764A CN 201910243866 A CN201910243866 A CN 201910243866A CN 109976764 A CN109976764 A CN 109976764A
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- Prior art keywords
- handle
- pointer
- conversion method
- present
- obtains
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/40—Transformation of program code
- G06F8/41—Compilation
- G06F8/43—Checking; Contextual analysis
- G06F8/433—Dependency analysis; Data or control flow analysis
- G06F8/434—Pointers; Aliasing
Abstract
The present invention relates to a kind of handle conversion method, include the steps that pointer to object moves to right one and obtains handle and handle moves to left one and obtains pointer to object.It is long that method of the invention solves the problems, such as in real time operating system file opening time, and can reduce EMS memory occupation, and can reflect whether File Open malfunctions and error message.
Description
Technical field
The present invention relates to a kind of inheritance methods of drawing course.
Background technique
It is one-to-one 32 unsigned integer values that handle, which is with pointer to object,.Pointer to object may map to uniquely
Handle, pointer to object also may map to unique object.Operating system provides necessarily programming interface to programmer, at these
In interface, allows programmer to access, create and destroy object.So handle passes through with pointer to object in these operating systems
Mapping implementation corresponds.
In the prior art, there are mainly two types of handle and pointer to object mapping modes: congruence mapping and table map.
Congruence mapping that is, handle itself is a pointers.Mapping is type conversion herein.Such case
Have: " process instance handle ", " module handle ", " resource handle " etc..
It is most common mapping mechanism between pointer to object and handle that table, which maps this,.Operating system creates table, and protects
Deposit all objects to be considered.When needing to create new object, sky entrance is first found in the table, then the number of expression object
According to inserting wherein.When object is deleted, its data member and its entrance in table are released.
But for congruence mapping, type conversion is only done, pointer to object is directly returned to user, and pointer is converted
After integer, it may be possible to which negative does not meet C and provides that handle is the standard for having symbol positive number, and negative can not be used as error
Mark.For table mapping, File Open requires to look up unappropriated item in table, distributes to this document, closing of a file
It needs to cancel the occupancy to table, causes File Open slower, and need to safeguard table committed memory.
Summary of the invention
In view of the above technical problems, the present invention provides a kind of handle conversion method, including pointer to object moves to right one and obtains
The step of handle and handle move to left one and obtain pointer to object.
Further, the handle is 32 place values for having symbol.
Further, last position of the pointer to object is zero.
Compared with prior art, the beneficial effects of the present invention are:
Method of the invention solves the problems, such as that file opening time is long in real time operating system, and can reduce memory and account for
With, and can reflect whether File Open malfunctions and error message.
Detailed description of the invention
Fig. 1 is the method for the present invention flow chart.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
The embodiment of the present invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
The present invention provides a kind of handle conversion method, including pointer to object moves to right one and obtains handle and handle moves to left one
The step of position obtains pointer to object.
It is the alignment principle of variable storage allocation according to modern compiler, last position of pointer to object is always zero, object
When pointer moves to right one and is converted into handle, obtained handle must be positive number；Occur opening failure, then returns to negative illegal sentence
Handle, then.And " 0 " of method pointer to object last bit of the invention so that handle first place becomes 0, that is, is realized just by moving to right one
Number.
Method of the invention solves the problems, such as that file opening time is long in real time operating system, and can reduce memory and account for
With, and can reflect whether File Open malfunctions and error message.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (3)
1. a kind of handle conversion method, it is characterised in that: move to right one including pointer to object and obtain handle and handle moves to left one
The step of position obtains pointer to object.
2. handle conversion method according to claim 1, it is characterised in that: the handle is 32 integer values for having symbol.
3. handle conversion method according to claim 1, it is characterised in that: last position of the pointer to object is zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910243866.8A CN109976764A (en) | 2019-03-28 | 2019-03-28 | A kind of handle conversion method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910243866.8A CN109976764A (en) | 2019-03-28 | 2019-03-28 | A kind of handle conversion method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109976764A true CN109976764A (en) | 2019-07-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910243866.8A Pending CN109976764A (en) | 2019-03-28 | 2019-03-28 | A kind of handle conversion method |
Country Status (1)
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Citations (12)
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| CN102214088A (en) * | 2010-04-07 | 2011-10-12 | 腾讯科技（深圳）有限公司 | Document unlocking method and device |
| CN102855437A (en) * | 2011-06-27 | 2013-01-02 | 奇智软件（北京）有限公司 | File unlocking method and device |
| US20150169226A1 (en) * | 2013-12-17 | 2015-06-18 | Xipeng Shen | Technologies for persistent memory programming |
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2019
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| US5890176A (en) * | 1996-04-24 | 1999-03-30 | International Business Machines Corp. | Object-oriented document version tracking method and apparatus |
| DE19742804A1 (en) * | 1996-09-27 | 1998-04-02 | Kodak Ltd | Computer system for interactive object control |
| US6662342B1 (en) * | 1999-12-13 | 2003-12-09 | International Business Machines Corporation | Method, system, and program for providing access to objects in a document |
| US20030158836A1 (en) * | 2002-02-20 | 2003-08-21 | Dinesh Venkatesh | Cluster meta file system of file system cells managed by respective data movers of a network file server |
| WO2007065356A1 (en) * | 2005-12-05 | 2007-06-14 | Beijing Sursen Co., Ltd | Document processing method |
| CN101206586A (en) * | 2006-12-19 | 2008-06-25 | 康佳集团股份有限公司 | Method for managing OS handle |
| US20090019079A1 (en) * | 2007-07-11 | 2009-01-15 | Mats Stefan Persson | Method, system and computer-readable media for managing software object handles in a dual threaded environment |
| CN102214088A (en) * | 2010-04-07 | 2011-10-12 | 腾讯科技（深圳）有限公司 | Document unlocking method and device |
| CN102855437A (en) * | 2011-06-27 | 2013-01-02 | 奇智软件（北京）有限公司 | File unlocking method and device |
| US20150169226A1 (en) * | 2013-12-17 | 2015-06-18 | Xipeng Shen | Technologies for persistent memory programming |
| CN105468342A (en) * | 2014-08-20 | 2016-04-06 | 西安慧泽知识产权运营管理有限公司 | Novel operating system handle management method |
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