C++ Atomic and memory barrier

 implement shared_ptr

1.

load acquire

store release

example

Thread 1 

ComplicateClass obj = new ComplicateClass(); // call constructor

ready.store(true, memory_order_release);

Thread 2

while(ready.load(memory_order_acquire) == 0) {

this.sleep();

}

do_some_stuff();

2.

acq_rel

~smart_ptr() {

    if (cnt.fetch_sub(1, memory_order_acq_rel) == 0) {

        delete ptr;    

}

}

https://youtu.be/OyNG4qiWnmU