线程同步技术

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
void *func(void *arg)
{
    pthread_mutex_lock(&mutex);
    int *a = (int *)arg;
    printf("thread%d start\n", *a);
    int i;
    for(i=0;i<10;i++)
    {
        printf("thread%d is running\n", *a);
        sleep(1);
    }
    printf("thread%d end\n", *a);
    pthread_mutex_unlock(&mutex);
    pthread_exit(NULL);
}
int main(int arg, char * args[])
{
    printf("process start\n");
    pthread_t thr_d1, thr_d2;
    int i[2];
    i[0] = 1; i[1] =2;
    pthread_create(&thr_d1, NULL, func, &i[0]);
    pthread_create(&thr_d2, NULL, func, &i[1]);
    pthread_join(thr_d1, NULL);
    pthread_join(thr_d2, NULL);
    printf("process end\n");
    return 0;
}