CN1979428A - System for automatically releasing applied programe module leaked memory in inlaid system - Google Patents

Abstract

The invention discloses a system for automatically releasing memory leakage of an application program module in an embedded system, comprising: a memory application unit, a memory release unit, a module state perception unit, a management configuration unit and a leak memory release unit, wherein: the module state perception unit , for receiving various running state information of the application program module, and connecting with the memory application unit, the memory release unit and the leak memory release unit, triggering the above-mentioned units to operate on the memory; the management configuration unit is used for establishing and real-time Update and save the identification of the module, the memory usage of the module and the memory index of the memory address allocated by the module, and connect with the memory application unit, the memory release unit and the leak memory release unit; the leak memory release unit is used to judge whether there is a leak memory and Free leaked memory. The invention solves the problem that the leaked memory in the embedded system is not released in time, and effectively utilizes the limited memory space.

Description

System for automatically releasing memory leaked by application modules in embedded systems

technical field

The invention relates to a system for releasing memory, in particular to a system for automatically releasing memory leaked by application program modules in an embedded system, and belongs to the technical field of computers.

Background technique

An embedded system is a resource-constrained system, and resources are more precious than desktop PCs, so the importance of effective memory usage is beyond doubt. How to make good use of limited memory to maximize performance has become a key issue for the further development of embedded systems.

At present, most embedded systems adopt the real memory management strategy, and the access to the memory is direct, that is, it is directly sent to the address line for output, and the addresses accessed in all programs are actual physical addresses; moreover, most The embedded operating system does not protect the memory space, and each program actually shares a running space. Before a program is executed, the system must allocate enough address space for it, and the user memory space is the remaining space after the allocation of global data and task stack space in RAM. After the memory is not used, it is released in time to ensure that there is space when applying again. If there is a memory leak in the program (that is, the memory is not released in time after the application), the program will eventually fail to run because there is not enough memory space. Therefore, how to effectively and automatically release the unreleased memory of the application module in the embedded system is a problem to be solved urgently.

Contents of the invention

The technical problem to be solved by the present invention is to propose a system that can automatically monitor and release the unreleased memory, which provides conditions for the effective use of the memory.

The present invention is realized by following technical means:

A system for automatically releasing memory leaked by application modules in an embedded system, comprising: a memory application unit, a memory release unit, a module state perception unit, a management configuration unit, and a leak memory release unit, wherein:

The memory application unit is used for memory application process operation;

The memory release unit is used for the memory release process operation;

The module state perception unit is used to receive various running state information of the application module, and connect with the memory application unit, the memory release unit and the leak memory release unit, and trigger the above units to operate on the memory;

The management configuration unit is used to establish and update in real time the identification of the preservation module, the memory usage of the module and the memory index of the memory address allocated by the module, and is connected with the memory application unit, the memory release unit and the leak memory release unit;

The leaked memory release unit is used to judge whether there is a leaked memory and release the leaked memory.

Further, the module state perception unit further includes:

A module call sensing unit for receiving application module entry information and triggering the memory application unit to operate on the memory;

An operation end sensing unit for receiving the end information of the application module and triggering the memory release unit to operate on the memory;

A module exit sensing unit for receiving application module exit information and triggering the memory operation of the leak memory release unit.

Further, the leaked memory release unit judges whether there is a leaked memory through the following method: judges whether the application module has a corresponding non-empty memory index item, and if so, it indicates that there is a memory leak.

Further, the release of the leaked memory by the leaked memory release unit is achieved by the following method: release the memory block of the index address pointed to by the non-empty memory index item, set the memory index item to be empty, and release the memory occupied by the module to establish the memory index .

Further, the memory index is an array, and the size of the array is the maximum usage value of the application program module.

Further, the memory index is in the form of a dynamic linked list, which is automatically added when the memory is applied for.

Further, the size of the requested memory is: the sum of the memory required for running the application module and the length of the memory index address pointer, and the length of the memory index address pointer is 4.

Further, the size of the released memory is: the sum of the released memory block and the length of the memory index address pointer, and the length of the memory index address pointer is 4.

Further, the system also includes an alarm unit connected to the memory release unit, which sends out an alarm prompt when the size of the released memory is not equal to that of the requested memory, the address of the released memory is wrong, or there is a leaked memory.

The system proposed by the present invention can automatically monitor unreleased memory and automatically release it, which provides conditions for the effective use of memory in embedded systems

Description of drawings

FIG. 1 is a structural block diagram of a system for automatically releasing memory leaked by application modules in an embedded system in a specific embodiment of the present invention.

Fig. 2 is a working flow chart of the system for automatically releasing the leaked memory of the application program module in the embedded system in the specific embodiment of the present invention.

Detailed ways

The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

A system for automatically releasing memory leaked by application modules in an embedded system, comprising a module call perception unit 1, a management configuration unit 2, a memory application unit 3, an operation end perception unit 4, a memory release unit 5, a module exit perception unit 6, Alarm unit 7, leak memory release unit 8, wherein:

A module call sensing unit 1, configured to receive the entry information of the application program module;

The management configuration unit 2 is used to establish the module memory control area for saving the module identification, the memory usage of the module, and the memory index area for the memory address allocated by the module, and record the application program module in real time in the module memory control area and the memory index area memory usage;

The memory application unit 3 is used for the operation of the memory application process;

The operation end perception unit 4 is used to receive the end information of the application module;

Memory release unit 5, used for memory release process operation;

A module exit sensing unit 6, configured to receive exit information of an application module;

The alarm unit 7 is connected with the memory release unit 5 and the leakage memory release unit 8, and is used to send an alarm prompt;

The leaked memory release unit 8 is configured to determine whether there is a leaked memory and release the leaked memory.

Among the above units, the memory application unit 3, the memory release unit 5 and the leaked memory release unit 8 are interfaces for accessing the memory during the running of the application program module.

Taking application module M startup as an example, the working process of this system is introduced as follows:

Step 101: The module call sensing unit 1 detects that the application module M is started, and the management configuration unit 2 establishes a module memory control area for storing the identification of the module M and the memory usage of the module M, and also establishes a memory index for storing the allocated memory address of the module area, which includes multiple memory index items, and each memory index item points to a memory address. In the initial state, the memory index items are all set to be free, and the application module memory is recorded in real time in the module memory control area and the memory index area. usage of

The memory index area can be an array, and the size of the array can determine a reasonable maximum value according to the memory usage of the module M; it can also be in the form of a linked list, which is dynamically added when the module M applies for memory.

Step 102: the memory application unit 3 searches for a free memory index item S1 in the memory index area of the management configuration unit 2 of the module M, and the memory index address pointed to by the memory index item S1 is DS1; apply through the memory allocation function provided by the system A memory block D1 whose size is Size+Head, where the size of Head is the length of the memory address pointer, generally 4, and the memory index address corresponding to the memory block D1 is DS1.

At this time, the management and configuration unit 2 correspondingly records the use of the memory by the module M in the module memory control area, including: the use address and the size of the occupied memory block.

Step 103: The operation end sensing unit 4 receives the end operation information of the application program module M, and sends a trigger signal to the memory release unit 5 to release the memory requested by the application program module M;

Step 104: the memory release unit 5 reads the memory index address DS1, compares whether the size of the memory block P-Head at this address is equal to the size of the memory block D1, if so, releases the memory block, and sets the content of DS1 to be empty; If not, explain that the memory P address that needs to be released is wrong or that the memory block is destroyed, the information is passed to the alarm unit 7, and the memory release error alarm is carried out;

Step 105: The module exit sensing unit 6 receives the exit information of the application module M, and sends a trigger signal for releasing the leaked memory to the leaked memory release unit 8;

Step 106: The leaked memory release unit 8 searches for all memory index items corresponding to the application module M. If there is a certain memory index item that is not empty, it means that the application module M has a memory leak, releases the corresponding memory block, and sets the memory The index item is empty, and the information is passed to the alarm unit 7 for a memory leak alarm; then the memory index area of the module M is released.

Claims (9)

1, the system of application program module leak memory in a kind of automatic release embedded system, comprise: be used for internal memory application process operation the internal memory application unit, be used for the internal memory releasing unit of internal memory dispose procedure operation, it is characterized in that, this system also comprises: module status perception unit, administration configuration unit and leak memory releasing unit, wherein:

Described module status perception unit is used to receive the various running state information of application program module, and is connected with described internal memory application unit, internal memory releasing unit and leak memory releasing unit, triggers said units and internally deposits into line operate;

Described administration configuration unit is used to set up with real-time update and preserves the sign of module, the internal memory index that module is used internal memory situation and module assignment memory address; Be connected with described internal memory application unit, internal memory releasing unit and leak memory releasing unit;

Described leak memory releasing unit is used to judge whether to exist leak memory and discharge leak memory.

2, the system of application program module leak memory in a kind of automatic release embedded system as claimed in claim 1 is characterized in that described module status perception unit comprises further:

Be used to receive application program module and enter information, and trigger the module invokes perception unit of internal memory application unit internal memory operation;

Be used to receive the application program module ending message, and trigger the EO perception unit of internal memory releasing unit internal memory operation;

Be used to receive application program module and withdraw from information, and trigger the leak memory releasing unit module of internal memory operation is withdrawed from the perception unit.

3, the system of application program module leak memory in a kind of automatic release embedded system as claimed in claim 1, it is characterized in that, described leak memory releasing unit judges whether to exist leak memory to realize by following method: judge whether application program module has corresponding non-NULL internal memory index entry, if have, show to have memory overflow.

4, the system of application program module leak memory in a kind of automatic release embedded system as claimed in claim 1, it is characterized in that, described leak memory releasing unit discharges leak memory to be realized by following method: the memory block that discharges non-NULL internal memory index entry index address pointed, the internal memory index entry is set for empty, discharges this module and set up internal memory index committed memory.

5, the system of application program module leak memory in a kind of automatic release embedded system as claimed in claim 1 is characterized in that described internal memory index is an array, and array size is the maximum use value of application program module.

6, the system of application program module leak memory in a kind of automatic release embedded system as claimed in claim 1, it is characterized in that: described internal memory index is the dynamic link table form, adds automatically when the internal memory application.

7, the system of application program module leak memory in a kind of automatic release embedded system as claimed in claim 1, it is characterized in that: the size of described application internal memory is: application program module operation required memory and internal memory index address pointer length sum, described internal memory index address pointer length is 4.

8, the system of application program module leak memory in a kind of automatic release embedded system as claimed in claim 1, it is characterized in that: described releasing memory size is: releasing memory piece and internal memory index address pointer length sum, described internal memory index address pointer length is 4.

9, the system of application program module leak memory in a kind of automatic release embedded system as claimed in claim 1, it is characterized in that: this system also comprises the alarm unit that links to each other with the leak memory releasing unit with the internal memory releasing unit, with unequal, the releasing memory error in address of application memory size and when having leak memory, send alarm in releasing memory.