Thread-Safe Initialization: call_once and once_flag
Explore how to use std::call_once and std::once_flag for thread-safe initialization in C++. Understand their rules and application in ensuring code executes only once across multiple threads, including practical use in implementing safe singleton patterns in a multithreaded environment.
We'll cover the following...
We'll cover the following...
By using the std::call_once function you can register a callable. The std::once_flag ensures that only one registered function will be invoked, but you can register additional functions via the same std::once_flag. That being said, only one function from that group is called.
std::call_once obeys the following rules:
- Exactly one execution of exactly one of the functions is performed. It is undefined which function will be selected for execution. The selected function runs in