Book Image

Hands-On High Performance Programming with Qt 5

By : Marek Krajewski
5 (1)
Book Image

Hands-On High Performance Programming with Qt 5

5 (1)
By: Marek Krajewski

Overview of this book

Achieving efficient code through performance tuning is one of the key challenges faced by many programmers. This book looks at Qt programming from a performance perspective. You'll explore the performance problems encountered when using the Qt framework and means and ways to resolve them and optimize performance. The book highlights performance improvements and new features released in Qt 5.9, Qt 5.11, and 5.12 (LTE). You'll master general computer performance best practices and tools, which can help you identify the reasons behind low performance, and the most common performance pitfalls experienced when using the Qt framework. In the following chapters, you’ll explore multithreading and asynchronous programming with C++ and Qt and learn the importance and efficient use of data structures. You'll also get the opportunity to work through techniques such as memory management and design guidelines, which are essential to improve application performance. Comprehensive sections that cover all these concepts will prepare you for gaining hands-on experience of some of Qt's most exciting application fields - the mobile and embedded development domains. By the end of this book, you'll be ready to build Qt applications that are more efficient, concurrent, and performance-oriented in nature
Table of Contents (14 chapters)

Questions

As usual, here are some questions to test and maybe deepen your understanding of the material in this chapter.

  1. Why is a data race an undefined behavior (UB) in C++?
  2. What does resource acquisition is initialization (RAII) mean? (we have seen it already in Chapter 3, Deep Dive into C++ and Performance) and how it can be used in QAtomicLocker?
  3. Why can volatile variables not be used to prevent race conditions?
  4. What are spurious wakes and why aren't they banned?
  5. Assume you are an OS (or some tool) and have just detected a deadlock. What could you do to resolve it?
  6. What is cache ping-pong?
  7. If you define slots in a QThread subclass, what do you think will happen when they get invoked by a signal?
  8. What do you think, the Windows system call InitializeCriticalSectionAndSpinCount() could do?
  9. What do you understand about using QProcess instead of QThread?
  10. What does the phrase...