Practical UML statecharts in C / C + + Second Edition bridges the gap between abstract concepts of high levels of the Unified Modeling Language (UML) and the actual programming aspects of modern hierarchical state machines (UML statecharts). This book describes the source, open lightweight, event-driven infrastructure, called QP that enables direct manual coding UML statecharts and the same event-driven applications in C or C + + without big tools. This book is presented in two parts. In Part I, you get a practical overview of concepts relevant state machinery ranging from traditional to state automata to modern UML state machines followed by state machine coding techniques and patterns of state-machine designs, all illustrated with executable examples. Part II begins with an explanation of key programming concepts such as inversion-event control ("Hollywood principle"), blocking versus non-blocking code, run-to-finish execution semantics (RTC), the importance of event queues, dealing with time, and the role of the state machinery to maintain the context from one event to the next.