c++11 atomic 之 c-style接口使用
atomic的c-style接口 ：提供相同语义但是不使用诸如：template reference 和member fucntion 等c++特性，整个atomic接口有一个C-style 对等品，成为C standard的一份补充，C-style接口一般适用于需要在C和C++之间保持兼容的代码身上 。
1、c-style变量
下表列出了类型对照：
更加详细详见
http://www.cplusplus.com/reference/atomic/
2、c-style 接口
Functions for atomic objects (C-style)
| c-style | describe |
|---|---|
| atomic_is_lock_free | Is lock-free (function ) |
| atomic_init | Initialize atomic object (function ) |
| atomic_store | Modify contained value (function ) |
| atomic_store_explicit | Modify contained value (explicit memory order) (function ) |
| atomic_load | Read contained value (function ) |
| atomic_load_explicit | Read contained value (explicit memory order) (function ) |
| atomic_exchange | Read and modify contained value (function ) |
| atomic_exchange_explicit | Read and modify contained value (explicit memory order) (function ) |
| atomic_compare_exchange_weak | Compare and exchange contained value (weak) (function ) |
| atomic_compare_exchange_weak_explicit | Compare and exchange contained value (weak, explicit) (function ) |
| atomic_compare_exchange_strong | Compare and exchange contained value (strong) (function ) |
| atomic_compare_exchange_strong_explicit | Compare and exchange contained value (strong, explicit) (function ) |
| atomic_fetch_add | Add to contained value (function ) |
| atomic_fetch_add_explicit | Add to contained value (explicit memory order) (function ) |
| atomic_fetch_sub | Subtract from contained value (function ) |
| atomic_fetch_sub_explicit | Subtract from contained value (explicit memory order) (function ) |
| atomic_fetch_and | Apply bitwise AND to contained value (function ) |
| atomic_fetch_and_explicit | Apply bitwise AND to contained value (explicit memory order) (function ) |
| atomic_fetch_or | Apply bitwise OR to contained value (function ) |
| atomic_fetch_or_explicit | Apply bitwise OR to contained value (explicit memory order) (function ) |
| atomic_fetch_xor | Apply bitwise XOR to contained value (function ) |
| atomic_fetch_xor_explicit | Apply bitwise XOR to contained value (explicit memory order) (function ) |
Functions for atomic flags (C-style)
| c-style | describe |
|---|---|
| atomic_flag_test_and_set | Test and set atomic flag (function ) |
| atomic_flag_test_and_set_explicit | Test and set atomic flag (explicit memory order) (function ) |
| atomic_flag_clear | Clear atomic flag (function ) |
| atomic_flag_clear_explicit | clear atomic flag (explicit memory order) (function ) |
3、例子
#include <atomic>
#include <iostream>
int main(void)
{
std::atomic_bool atomic_bool_test1;
std::atomic_init(&atomic_bool_test1,false);
std::cout << "init atomic_bool_test1 "<<atomic_bool_test1<<std::endl;
std::atomic_store(&atomic_bool_test1,true);
std::cout << "init atomic_bool_test1 "<<atomic_bool_test1<<std::endl;
std::cout << "init atomic_bool_test1 "<<atomic_load(&atomic_bool_test1)<<std::endl;
}
4 c11中原子操作相关（未完待续。。。。）
c11中同样也支持了原子操作，相关内容单独进行解析；
可以推荐几篇不错的博文
C11标准库中的atomic原子操作
https://en.cppreference.com/w/c/atomic
5 参考
http://www.cplusplus.com/reference/atomic/
《c++标准库 第二版》
