包含指针的原子结构

Question

#include <atomic>
#include <iostream>

using namespace std;

struct Simple{
    int a = 0;
    int b = 0;
};

struct WithPointer{
    int *a = nullptr;
    int b = 0;
};

int main(int argc, char const *argv[])
{
    atomic<Simple> simple;
    cout<<simple.is_lock_free()<<"\n";
    
    atomic<Simple*> simple_p;
    cout<<simple_p.is_lock_free()<<"\n";

    atomic<WithPointer> with_pointer;
    cout<<with_pointer.is_lock_free()<<"\n";

    return 0;
}

此示例适用于 Simple 结构，但不适用于 WithPointer 结构。我收到以下编译错误，为什么？我能做什么。

g++ main.cpp
/usr/bin/ld: /tmp/cc49YEoR.o: in function `std::atomic<WithPointer>::is_lock_free() const':
1a.cpp:(.text._ZNKSt6atomicI11WithPointerE12is_lock_freeEv[_ZNKSt6atomicI11WithPointerE12is_lock_freeEv]+0x1d): undefined reference to `__atomic_is_lock_free'
collect2: error: ld returned 1 exit status

Answer 1

您需要在 clang 和 gcc 上使用 -latomic 标志编译程序。 demo.

包含指针的原子结构

Atomic struct containing pointer

c++

locking

g++

atomic