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Is there any sense to make atomic objects with the qualifier - volatile?
Use that:
volatile std::atomic<int> i(1);
instead of:
std::atomic<int> i(1);
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Atomic variable examples In order to use atomicity in your program, use the template argument std::atomic on the attributes. Note, that you can't make your whole class atomic, just it's attributes. }; You don't need to use volatile along with std::atomic .
Volatile Keyword in C/C++ Volatile is a qualifier that is applied to a variable when it is declared. It tells the compiler that the value of the variable may change any time.
The atomic type is implemented using mutex locks. If one thread acquires the mutex lock, then no other thread can acquire it until it is released by that particular thread.
No, there is absolutely no sense in making std::atomic also volatile, as inside the std::atomic, the code will deal with the possibility that the variable may change at any time, and that other processors may need to be "told" that it has changed (the "telling" other processors is not covered by volatile).
The only time you really need volatile is if you have a pointer to piece of hardware that your code is controlling - for example reading a counter in a timer, or a which frame buffer is active right now, or telling a network card where to read the data for the next packet to send. Those sort of things are volatile, because the compiler can't know that the value of those things can change at any time.
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