71 lines
1.4 KiB
C++
71 lines
1.4 KiB
C++
#include <atomic>
|
|
#include <iostream>
|
|
#include <memory>
|
|
#include <thread>
|
|
|
|
template <typename T>
|
|
class stack {
|
|
private:
|
|
struct node {
|
|
std::shared_ptr<T> data;
|
|
std::shared_ptr<node> next;
|
|
|
|
node(T const& data_) : data(std::make_shared<T>(data_)) {}
|
|
};
|
|
|
|
std::shared_ptr<node> head;
|
|
|
|
public:
|
|
void push(T const& data)
|
|
{
|
|
std::shared_ptr<node> const new_node = std::make_shared<node>(data);
|
|
new_node->next = std::atomic_load(head);
|
|
while (!std::atomic_compare_exchange_weak(&head, &new_node->next, new_node))
|
|
;
|
|
}
|
|
std::shared_ptr<T> pop()
|
|
{
|
|
std::shared_ptr<node> old_head = std::atomic_load(head);
|
|
while (old_head &&
|
|
!std::atomic_compare_exchange_weak(&head, &old_head, old_head->next))
|
|
;
|
|
return old_head ? old_head->data : std::shared_ptr<T>();
|
|
}
|
|
};
|
|
|
|
void
|
|
push(stack<int>* s)
|
|
{
|
|
for (int i = 0; i < 10; ++i) {
|
|
printf("pushing %d\n", i);
|
|
s->push(i);
|
|
}
|
|
}
|
|
|
|
void
|
|
pop(stack<int>* s)
|
|
{
|
|
int count = 0;
|
|
std::shared_ptr<int> e;
|
|
while (count < 10) {
|
|
if (e = s->pop()) {
|
|
printf("popping %d\n", *e);
|
|
++count;
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
main()
|
|
{
|
|
std::shared_ptr<int> sp = std::make_shared<int>(1);
|
|
// printf("std::atomic_is_lock_free(std::shared_ptr): %d\n",
|
|
// std::atomic_is_lock_free(&sp));
|
|
stack<int> s;
|
|
std::thread t1(push, &s);
|
|
std::thread t2(pop, &s);
|
|
t1.join();
|
|
t2.join();
|
|
return 0;
|
|
}
|