listing_5.10.cpp

#include <string>
#include <thread>
#include <atomic>
#include <assert.h>
struct X
{
    int i;
    std::string s;
};

std::atomic<X*> p;
std::atomic<int> a;

void create_x()
{
    X* x=new X;
    x->i=42;
    x->s="hello";
    a.store(99,std::memory_order_relaxed);
    p.store(x,std::memory_order_release);
}

void use_x()
{
    X* x;
    while(!(x=p.load(std::memory_order_consume)))
        std::this_thread::sleep_for(std::chrono::microseconds(1));
    assert(x->i==42);
    assert(x->s=="hello");
    assert(a.load(std::memory_order_relaxed)==99);
}
int main()
{
    std::thread t1(create_x);
    std::thread t2(use_x);
    t1.join();
    t2.join();
}