An event manager can be used to effect a library function call from a caller service processor application to a data processing function in a library. The library is compiled into a callee service processor application, including passing, by the caller service processor application to the event manager through the caller service processor application's API, an event representing the library function call; passing, by the event manager to the callee service processor application, the event representing the library function call; executing by the callee service processor application the library function call, including retrieving return data from the library function call; returning, by the callee service processor application to the event manager, an event representing the return data from the library function call; and returning, by the event manager to the caller service processor application, the event representing the return data from the library function call.