What is the difference between unix and windows?

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Unix and Windows use completely different paradigms for run-time loading of code. Before you try to build a module that can be dynamically loaded, be aware of how your system works.

In Unix, a shared object (.so) file contains code to be used by the program, and also the names of functions and data that it expects to find in the program. When the file is joined to the program, all references to those functions and data in the file's code are changed to point to the actual locations in the program where the functions and data are placed in memory. This is basically a link operation.

In Windows, a dynamic-link library (.dll) file has no dangling references. Instead, an access to functions or data goes through a lookup table. So the DLL code does not have to be fixed up at runtime to refer to the program's memory; instead, the code already uses the DLL's lookup table, and the lookup table is modified at runtime to point to the functions and data.

In Unix, there is only one type of library file (.a) which contains code from several object files (.o). During the link step to create a shared object file (.so), the linker may find that it doesn't know where an identifier is defined. The linker will look for it in the object files in the libraries; if it finds it, it will include all the code from that object file.

In Windows, there are two types of library, a static library and an import library (both called .lib). A static library is like a Unix .a file; it contains code to be included as necessary. An import library is basically used only to reassure the linker that a certain identifier is legal, and will be present in the program when the DLL is loaded. So the linker uses the information from the import library to build the lookup table for using identifiers that are not included in the DLL. When an application or a DLL is linked, an import library may be generated, which will need to be used for all future DLLs that depend on the symbols in the application or DLL.

Alok Dubey

  • Nov 2nd, 2005
 

You may compare it as MS-DOS and UNIX as MS-DOS is predecessor of Windows just like that unix is for LINUX.We can't compare unix with windows.

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rocky65536

  • Sep 21st, 2009
 

             UNIX                                 Windows                              
        Multi user                              SIngle user
        CLUI                                      GUI
        Secure                                   less secure

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ranjith54

  • Mar 17th, 2010
 

Windows does not support multitasking, and multiprocessing of data, Unix based machines are used for high end servers.  Most of the unix based systems are having thier own architechture like for Sun it has having thier their server architechture sunfire, sun blade, sun sparc, work stations.
They are mostly command line based they provide more security level compared to Windows O/s.

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