线程私有关键字配合static使用

#include<stdio.h>

#include<pthread.h>

void* test(void *arg)

{

int n = 10;

static __thread int a = 0;

printf("running in thread :%d, a= %d\n",pthread_self(),a++);

usleep(200);

}

void* test1(void *arg)

{

int n = 10;

while(n--)

test(NULL);

}

int main()

{

pthread_t thread1;

pthread_t thread2;

pthread_create(&thread1, NULL, test1, NULL);

pthread_create(&thread2, NULL, test1, NULL);

pthread_join(thread1, NULL);

pthread_join(thread2, NULL);

return 0;

}

运行结果