A dynamic library in a dynamic DSP application can utilize services that are provided by the RTOS. These functions in the RTOS that are callable from a dynamic library must be exported when the RTOS is built. Similarly, a dynamic library must import any function or data object symbols that are part of the RTOS when the dynamic library is built.
Exported symbols in a dynamic object, dynA, are available for use by any other dynamic object that links with dynA. When a dynamic object imports a symbol, it is asserting that when the object is loaded, the definition of that symbol must be contained in a dynamic object that is already loaded or one that is required to be loaded. The symbol importing and exporting mechanisms lie at the core of how dynamic objects are designed to interact with each other. This subject is explored in more detail in Section 8.12.4.1.