第一部分:硬件基石——现代计算机的内存乱局
CPU缓存体系与一致性协议
现代CPU为了弥补内存速度的瓶颈,引入了多级缓存体系:
代码语言:txt
AI代码解释
Core 1 Core 2 Core 3 Core 4 | | | | L1d L1d L1d L1d | | | | L2 L2 L2 L2 \ \ / / \ \ / / \ \ / / \ \ / / \ X / \ / \ / \ / \ / \ / \ / \ / \ / L3 Cache | Main MemoryMESI协议保证了缓存一致性,但它只保证最终一致性,不保证实时性。
指令重排:看不见的优化
编译器重排
代码语言:cpp
AI代码解释
// 源代码 a = 1; b = 2; // 编译器可能优化为 b = 2; a = 1;CPU重排
代码语言:cpp
AI代码解释
// 线程1 void thread1() { data = 42; // Store操作 ready.store(true); // Store操作 } // 线程2 void thread2() { if (ready.load()) { // 在某些架构上,data可能还是旧值! assert(data == 42); } }第二部分:C++内存模型的核心抽象
C++11引入了正式的内存模型,为我们提供了控制内存访问顺序的工具。
关键关系
- sequenced-before:同一线程内的操作顺序
- synchronizes-with:跨线程的同步关系
- happens-before:全局可见的操作顺序
代码语言:cpp
AI代码解释
// synchronizes-with 关系示例 std::atomic<bool> flag{false}; int data = 0; // 线程A void producer() { data = 42; // (1) flag.store(true, std::memory_order_release); // (2) - release操作 } // 线程B void consumer() { while (!flag.load(std::memory_order_acquire)) { // (3) - acquire操作 // 循环等待 } // (4) 这里保证能看到data = 42的结果 assert(data == 42); }在这个例子中,(2)与(3)之间建立了synchronizes-with关系,从而保证了(1)happens-before(4)。
第三部分:六种内存序深度解析
1.memory_order_seq_cst:顺序一致性
最强保证,所有操作按一个全局顺序执行。相当于在每个原子操作前后都加了内存屏障。
代码语言:cpp
AI代码解释
std::atomic<int> x{0}, y{0}; // 线程1 x.store(1, std::memory_order_seq_cst); // 屏障 y.store(1, std::memory_order_seq_cst); // 屏障 // 线程2 if (y.load(std::memory_order_seq_cst) == 1) { // 屏障 // 这里x一定为1 assert(x.load(std::memory_order_seq_cst) == 1); }2.memory_order_release与memory_order_acquire:释放-获取语义
配对使用,建立synchronizes-with关系。
代码语言:cpp
AI代码解释
std::atomic<bool> ready{false}; int payload = 0; // 发布线程 - 写操作使用release void publisher() { payload = 42; // 非原子写入 ready.store(true, std::memory_order_release); // 发布:保证之前的写入对获取线程可见 } // 订阅线程 - 读操作使用acquire void subscriber() { while (!ready.load(std::memory_order_acquire)) { // 获取:看到release存储后,保证看到之前的所有写入 // 等待 } // 这里payload一定是42 std::cout << payload << std::endl; }3.memory_order_acq_rel:获取-释放语义
用于读-修改-写操作,同时具有acquire和release语义。
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