linux 用户空间 原子操作

#include <stdatomic.h>

atomic_int counter = ATOMIC_VAR_INIT(0);

void increment_counter() {
    atomic_fetch_add(&counter, 1);
}

#include <stdatomic.h>
#include <stdbool.h>

atomic_bool ready = ATOMIC_VAR_INIT(false);

void producer() {
    // 生产数据
    atomic_store_explicit(&ready, true, memory_order_release);
}

void consumer() {
    while (!atomic_load_explicit(&ready, memory_order_acquire)) {
        // 等待数据
    }
    // 消费数据
}

#include <stdatomic.h>

typedef struct {
    int value;
    int version;
} AtomicWithVersion;

bool compare_and_swap(AtomicWithVersion* obj, int expected_value, int new_value) {
    int expected_version = obj->version;
    return atomic_compare_exchange_strong((_Atomic(AtomicWithVersion)*)obj,
                                          &(AtomicWithVersion){expected_value, expected_version},
                                          (AtomicWithVersion){new_value, expected_version + 1});
}