According to one embodiment of the present invention, a method for operating a computer system including a main processor, a processing element and memory is provided. The method includes receiving, at the processing element, a task from the main processor, performing, by the processing element, an instruction specified by the task, determining, by the processing element, that a function is to be executed on the main processor, the function being part of the task, sending, by the processing element, a request to the main processor for execution, the request comprising execution of the function and receiving, at the processing element, an indication that the main processor has completed execution of the function specified by the request.