From the course: Complete Guide to Parallel and Concurrent Programming with C++
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Atomic objects: C++ demo - C++ Tutorial
From the course: Complete Guide to Parallel and Concurrent Programming with C++
Atomic objects: C++ demo
- [Instructor] Using a lock to protect a shared variable with mutual exclusion works, but if you're only doing simple operations, like incrementing a variable's value, then a simpler solution is to use C++ atomic types, which encapsulate a value and synchronize access to it to prevent a data race. If I scroll down this documentation page, I see a variety of atomic types, including atomic booleans, characters, integers, long values, and so on. Continuing down the page is a list of functions of the atomic object, which implement many of the common operations. To demonstrate using atomic objects, I'm going to modify the previous example code to demonstrate a data race, which has two parallel threads incrementing a count variable 10 million times. I should get an output of 20 million, but since I'm using a regular integer on line 6 and I don't have any locks in place to protect it with mutual exclusion, when I run this program, it has a data race that produces an incorrect result, less…
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