- Why is a data race an undefined behavior (UB) in C++?
Because changes from one thread may not yet be visible in another thread, and thus some results would be not defined! Thread visibility is a concept we haven't discussed yet, but the main concept is that different threads are allowed to work on their local cache data and only push the changes to the other thread caches when they are forced to do so. We can force such an update using a memory fence, and memory fencing is part of the implementation of mutexes and atomic variables. See also the response to question 10. - What is resource acquisition is initialization (RAII) (we have seen it already in Chapter 3, Deep Dive into C++ and Performance), and how is it used in QAtomicLocker?
It describes an object that initializes some resource in its constructor and deinitializes it in the destructor. The QAtomicLocker...
Hands-On High Performance Programming with Qt 5
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Hands-On High Performance Programming with Qt 5
By:
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
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Current Title:
Hands-On High Performance Programming with Qt 5
Table of Contents (14 chapters)
Preface
Free Chapter
Understanding Performant Programs
Profiling to Find Bottlenecks
Deep Dive into C++ and Performance
Using Data Structures and Algorithms Efficiently
An In-Depth Guide to Concurrency and Multithreading
Performance Failures and How to Overcome Them
Understanding I/O Performance and Overcoming Related Problems
Optimizing Graphical Performance
Optimizing Network Performance
Qt Performance on Embedded and Mobile Platforms
Testing and Deploying Qt Applications
Assessments
Other Books You May Enjoy
Customer Reviews