unique_ptr是否线程安全?下面的代码会不会打印两次相同的数字?
#include <memory>
#include <string>
#include <thread>
#include <cstdio>
using namespace std;
int main()
{
unique_ptr<int> work;
thread t1([&] {
while (true) {
const unique_ptr<int> localWork = move(work);
if (localWork)
printf("thread1: %d\n", *localWork);
this_thread::yield();
}
});
thread t2([&] {
while (true) {
const unique_ptr<int> localWork = move(work);
if (localWork)
printf("thread2: %d\n", *localWork);
this_thread::yield();
}
});
for (int i = 0; ; i++) {
work.reset(new int(i));
while (work)
this_thread::yield();
}
return 0;
}
unique_ptr
并不比T*
更安全。 - SnakEunique_ptr
。 - Paul Sanders