最简单的线程

 #include<stdio.h>
 #include<pthread.h>
 
 
 void *print_thread_id(void *arg)
 {
         /* 打印当前线程的线程号*/
         printf("Current thread id is %u ", (unsigned)pthread_self());
 }
 
 int main(int argc, char *argv[])
 {
         pthread_t thread;               /*保存线程号*/
 
         /*创建一个线程  */
         pthread_create(&thread, NULL, print_thread_id, NULL);
 
         sleep(1);                       　　/*休眠1s*/
 
         /*打印进程号    */
         printf("Main thread id is %u ", (unsigned)pthread_self());
 
         return 0;
 }