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Loading the program will load these objects/libraries as well, and perform a final linking. This approach offers two advantages: Often-used libraries (for example the standard system libraries) need to be stored in only one location, not duplicated in every single executable file, thus saving limited memory and disk space.
Linking is often referred to as a process that is performed when the executable is compiled, while a dynamic linker is a special part of an operating system that loads external shared libraries into a running process and then binds those shared libraries dynamically to the running process. This approach is also called dynamic linking or late ...
For example, Plan 9 from Bell Labs and its successor 9front intentionally avoid dynamic linking, as they consider it to be "harmful". [9] The Go programming language, by some of the same developers as Plan 9, also did not support dynamic linking, but plugin loading is available since Go 1.8 (February 2017). The Go runtime and any library ...
For example, .ocx is a common ... The following examples show how to use the run-time loading and linking facilities using language-specific Windows API bindings.
Loading a program involves either memory-mapping or copying the contents of the executable file containing the program instructions into memory, and then carrying out other required preparatory tasks to prepare the executable for running. Once loading is complete, the operating system starts the program by passing control to the loaded program ...
Smart linking is performed by a build tool that excludes unused code in the linking process. For example, a program that only uses integers for arithmetic, or does no arithmetic operations at all, can exclude floating-point library routines. This can lead to smaller program file size and reduced memory usage.
Dynamic linking or late binding is linking performed while a program is being loaded or executed , rather than when the executable file is created. A dynamically linked library ( dynamic-link library , or DLL, under Windows and OS/2 ; shareable image under OpenVMS ; [ 7 ] dynamic shared object, or DSO, under Unix-like systems) is a library ...
Relocation is the process of assigning load addresses for position-dependent code and data of a program and adjusting the code and data to reflect the assigned addresses. [1] [2] Prior to the advent of multiprocess systems, and still in many embedded systems, the addresses for objects are absolute starting at a known location, often zero.