#include <stdio.h>
#include <pthread.h>
#include <sys/syscall.h>
#include <assert.h>

#define gettid() syscall(__NR_gettid)

pthread_key_t key;
__thread int count = 2222;
__thread unsigned long long count2 ;
static __thread int count3;
void echomsg(int t)
{
    printf("destructor excuted in thread %x,param=%x\n",pthread_self(),t);
}

void * child1(void *arg)
{
    int b;
    int tid=pthread_self();

    printf("I am the child1 pthread_self return %p gettid return %d\n",tid,gettid());

    char* key_content = malloc(8);
    if(key_content != NULL)
    {
        strcpy(key_content,"ACACACA");
    }
    pthread_setspecific(key,(void *)key_content);
    
    count=666666;
    count2=1023;
    count3=2048;
    printf("I am child1 , tid=%x ,count (%p) = %10d,count2(%p) = %10llu,count3(%p) = %6d\n",tid,&count,count,&count2,count2,&count3,count3);
    asm volatile("movl %%gs:0, %0;":"=r"(b) /* output */);

    printf("I am child1 , GS address %x\n",b);
    
    sleep(2);
    printf("thread %x returns %x\n",tid,pthread_getspecific(key));
    sleep(50);
}

void * child2(void *arg)
{
    int b;
    int tid=pthread_self();

    printf("I am the child2 pthread_self return %p gettid return %d\n",tid,gettid());

    char* key_content = malloc(8);
    if(key_content != NULL)
    {
        strcpy(key_content,"ABCDEFG");
    }
    pthread_setspecific(key,(void *)key_content);
    count=88888888;
    count2=1024;
    count3=2047;
    printf("I am child2 , tid=%x ,count (%p) = %10d,count2(%p) = %10llu,count3(%p) = %6d\n",tid,&count,count,&count2,count2,&count3,count3);
    
    asm volatile("movl %%gs:0, %0;":"=r"(b) /* output */);

    printf("I am child2 , GS address %x\n",b);
    
    sleep(1);
    printf("thread %x returns %x\n",tid,pthread_getspecific(key));
    sleep(50);
}

int main(void)
{
    int b;
    pthread_t tid1,tid2;
    printf("hello\n");
    
    pthread_key_create(&key,echomsg);

    asm volatile("movl %%gs:0, %0;":"=r"(b) /* output */);

    printf("I am the main , GS address %x\n",b);
    
    pthread_create(&tid1,NULL,child1,NULL);
    pthread_create(&tid2,NULL,child2,NULL);

    printf("pthread_create tid1 = %p\n",tid1);
    printf("pthread_create tid2 = %p\n",tid2);

    sleep(60);
    pthread_key_delete(key);
    printf("main thread exit\n");
    return 0;
}