... message and then handles that message is determined by the Application Kit classes BLooper and BHandler A BLooper object runs a message loop in a thread This message loop receives messages and dispatches ... you’ve dealt mostly with system messages—messages generated and dispatched by the system The Message Protocols appendix of the Be Book defines all the system messages In short, system messages fall ... messages, a quick review of system messages will minimize confusion between how these different types of messages are handled System message handling When an application receives a system message, it...
... BHandler class, so a window is also a handler—an object that can handle messages that are dispatched from a message loop A window can both receive messages and handle them For the most part, system ... BWindow::MessageReceived(BMessage* message) { switch(message->what) { // handle B_KEY_DOWN and scripting-related system messages 188 Chapter 6: Controls and Messages default: BHandler::MessageReceived(message); } } Your project’s ... what data member, and responds depending on its value The BHandler class defines such a MessageReceived() function The BHandlerderived class BWindow inherits this function and overrides it The...
... Sivan, and Aaron and my Nicolette Avi Silberschatz To Brendan and Ellen, and Barbara, Anne and Harold, and Walter and Rebecca Peter Baer Galvin To my Mom and Dad, Greg Gagne Preface Operating systems ... 2.1 Operating- System Services 55 2.2 User and Operating- System Interface 58 2.3 System Calls 62 2.4 Types of System Calls 66 2.5 System Programs 74 2.6 Operating- System Design and Implementation ... Chapters and explain what operating systems are, what they do, and how they are designed and constructed These chapters discuss what the common features of an operatingsystem are and what an operating...
... cycle Since the operatingsystem is the interface between the hardware and user programs, a good understanding of operating systems requires an understanding of both hardware and programs Answers ... volume is an instructor’s manual for the Sixth Edition of Operating- SystemConcepts by Abraham Silberschatz, Peter Baer Galvin, and Greg Gagne It consists of answers to the exercises in the parent ... (multiprogramming, time sharing, distributed system, and so on) The purpose is to show why operating systems are what they are by showing how they developed In operating systems, as in much of computer science,...