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dynamically linked library : FOLDOC | Dynamically Linked Library (DLL) A library which is linked to application programs when they are loaded or run rather than as the final phase of {compilation}. This means that the same block of library code can be shared between several {tasks} rather than each task containing copies of the routines it uses. The executable is compiled with a library of "{stubs}" which allow {link errors} to be detected at compile time. Then, at run time, either the system {loader} or the task's entry code must arrange for library calls to be patched with the addresses of the real shared library routines, possibly via a {jump table}. The alternative is to make library calls part of the operating system kernel and enter them via some kind of trap instruction. This is generally less efficient than an ordinary subroutine call. It is important to ensure that the version of a dynamically linked library is compatible with what the executable expects. Examples of operatin
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