METHOD AND SYSTEM FOR LOADING STATUS CONTROL OF DLL

• US 20100106950A1
• Filed: 10/28/2009
• Published: 04/29/2010
• Est. Priority Date: 10/29/2008
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Hou, Rui, Wang, Yan Qi, Wang, Huayong, Liu, Zhi Yu
• Granted Patent: US 8,589,896 B2
• Time in Patent Office: Days
• US Class Current: 712/233
• CPC Class Codes: G06F 8/37 Compiler construction; Parser generation
• CPC Class Codes: G06F 8/41 Compilation
• CPC Class Codes: G06F 9/30058 Conditional branch instructions
• CPC Class Codes: G06F 9/44521 Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading
• CPC Class Codes: G06F 9/44594 Unloading

Abstract

Apparatus and methods are provided for controlling the loading status of DLLs. Specifically, a streaming program compiler is provided. The compiler includes operation modules for calling DLLs during streaming program execution; association table generating units for generating association tables according to user-defined rules, where the association table includes entries indicating (i) stream branches of the streaming program and (ii) an operation module corresponding to the stream branches; and a trigger generating unit for generating a trigger based on user-defined rules, where the trigger generating unit (i) determines which conditions for loading and unloading DLLs fit the streaming program, (ii) matches these conditions to a particular stream branch to identify a matched stream branch, and (iii) sends out triggering signals indicating the matched stream branch. This invention also provides a corresponding method and controller.

Claims

1. A streaming program compiler for compiling a streaming program, said compiler comprising:

an operation module for calling a dynamic link library (DLL) during execution of said streaming program;

an association table generating unit for generating an association table according to a user-defined rule, wherein said association table includes an entry indicating (i) a stream branch of said streaming program and (ii) an operation module corresponding to said stream branch; and

a trigger generating unit for generating a trigger based on said user-defined rule, wherein said trigger generating unit (i) determines which condition for loading and unloading dynamic link libraries fits said streaming program, (ii) matches said condition to a particular stream branch to identify a matched stream branch, and (iii) sends out a triggering signal indicating the matched stream branch.

2. The compiler according to claim 1, wherein said user-defined rule is included in said streaming program.

3. The compiler according to claim 1, wherein said matched stream branch comprises a plurality of operation modules.

4. The compiler according to claim 3, wherein at least one said plurality of operation modules are required by said matched stream branch.

5. The compiler according to claim 3, wherein at least one said plurality of operation modules are not required by said matched stream branch.

6. The compiler according claim 1, further comprising a controller generating unit for generating a controller wherein said controller (i) refers said association table with said particular stream branch indicated by said triggering signal to determine an unnecessary operation module corresponding to said particular stream branch, and (ii) unloads a DLL called by said unnecessary operation module.

7. The compiler according to claim 1, wherein said trigger generating unit is further configured to embed said trigger into said operation module.

8. A controller for controlling the loading status of a DLL in a streaming program, said controller comprising:

an operation module determining unit for (i) receiving a triggering signal indicating a stream branch and (ii) referencing an association table with said stream branch to determine an unnecessary operation module which corresponds to said stream branch; and

a DLL controlling unit for unloading a DLL called by said unnecessary operation module;

wherein said streaming program includes an operation module for calling a DLL during execution of said streaming program.

9. The apparatus according to claim 8, wherein said association table has recorded correspondence between said stream branch and said unnecessary operation module.

10. The apparatus according to claim 9, wherein said association table is (i) generated according a user-defined rule and (ii) comprised of an entry which indicates a stream branch of said streaming program and an operation module which corresponds to said stream branch.

11. The apparatus according to claim 8, wherein said DLL controlling unit sends a terminating command to said unnecessary operation module and unloads said DLL by calling a terminating function.

12. The apparatus according to claim 8, wherein said triggering signal is generated by (i) determining which condition for loading and unloading dynamic link libraries fits said streaming program and (ii) matching said condition to said stream branch.

13. A method of controlling the loading status of a DLL in a streaming program, said method comprising the steps of:

calling, by an operation module in said streaming program, said DLL during the execution of said streaming program;

receiving, by a receiving unit, a triggering signal identifying a stream branch;

determining, by a determining unit, an unnecessary operation module which corresponds to said stream branch by referring to an association table; and

unloading, by an unloading unit, a DLL called by said unnecessary operation module thereby freeing at least a portion of a system'"'"'s memory.

14. The method according to claim 13, wherein said triggering signal is generated by determining which condition for loading and unloading DLLs fits said streaming program, and matching said condition to said stream branch.

15. The method according to claim 13, wherein said association table has recorded correspondence between said stream branch and said unnecessary operation module.

16. The method according to claim 15, wherein said association table is (i) generated according a user-defined rule and (ii) includes an entry which indicates a stream branch of said streaming program and an operation module which corresponds to said stream branch.

17. The method according to claim 13, wherein the step of unloading said DLL called by said unnecessary operation module comprises:

sending a terminating command to said unnecessary operation module; and

calling a terminating function to unload said DLL.