gcc 原子操作

#include
#include
#include "pthread.h"

int cc = 0;
int test=0;

void* task2(void *arg)
{
    printf("s2");
    while(1){
        int expect = 0;
        atomic_compare_exchange_weak_explicit (&cc, &expect, 1, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED);
        printf("%d", test);
    }

}
void main()
{

    pthread_t t1;
    pthread_create(&t1, NULL, task2, NULL);

    printf("s1");
    while(1){
        int expect = 0;
        atomic_compare_exchange_weak_explicit (&cc, &expect, 1, __ATOMIC_SEQ_CST, __ATOMIC_ACQUIRE);
        test = 0;

        atomic_compare_exchange_strong(&cc, &expect, 1);
    }
}

__sync_synchronize();

aarch64-linux-gnu-gcc main.c -g  -lpthread -static

aarch64-linux-gnu-objdump -S -d a.out > a1.s