SFML Game Development by Sfml Game Development 2013
Author:Sfml Game Development 2013
Language: eng
Format: epub
Publisher: Packt Publishing
Concurrency
When two threads are running in parallel, everything will go smoothly if they don't touch the same data at the same time. Anyway, it is very normal that two or more threads want to read/write to the same variables, if not for more, to communicate between them.
It probably goes without saying that if the processor is reading and writing to the same memory address at the same time, we are going to have a nice crash or an undefined behavior in our program, which can be troublesome to debug and correct.
But then, how to guarantee that multiple threads operate on shared data at turns, with proper synchronization? This is a very delicate topic that must not be taken lightly; however, there are mechanisms in SFML that help us achieve this!
Here, we introduce you to sf::Mutex and sf::Lock. These are incredible tools to protect shared data when working with multi-threading. We won't be explaining in depth how they work internally, but rather try to apply it directly and understand it by example, by looking at the ParallelTask class implementation.
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