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By Keigo Matsubara, Edison Kwok, Inge Rodriguez, Murali Paramasivam

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So shared module. so is a candidate for lazy loading. so is not loaded at all. so, patches a function descriptor to make sure subsequent calls simply go directly to the function itself, and then invokes the called function. If for some reason the module cannot be loaded, the lazy loader's error-handler is invoked. Using lazy loading does not usually change the behavior of a program, but there are the following exceptions: • Any program that relies on the order that modules are loaded in is going to be affected, because modules can be loaded in a different order, and some modules might not be loaded at all.

A module is lazy loaded when all references to the module are function calls. If variables in the module Chapter 2: Compiling and Linking 55 56 Chapter 2: Compiling and Linking are referenced, the module is loaded in the normal way. so shared module. so is a candidate for lazy loading. so is not loaded at all. so, patches a function descriptor to make sure subsequent calls simply go directly to the function itself, and then invokes the called function. If for some reason the module cannot be loaded, the lazy loader's error-handler is invoked.

2. At the program load-time, the system loader (the kernel component that starts new processes) reads the XCOFF header information of the executable and attempts to locate any referenced shared libraries. Assuming all the referenced shared objects and libraries are found, the executable can be started. Then, the system loader attempts to load the sections in the executable file into the appropriate segments in the process address space, as explained in Table 2-2 on page 62. The program text in shared objects and libraries is loaded into the global system memory by the first program that needs it and is shared by all programs that use it.

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