#include 
     
      #include 
      
       #include 
       
        #include 
        
         //取消线程，是否会释放线程的所有资源？例子：void *thread1(void *arg){        printf("start thread (%u)\n", (unsigned)pthread_self());}       int main(int argc, char *argv[]) {               pthread_t  t1, t2, t3;         int ret;       printf("main start\n");        do{                     ret = pthread_create(&t1, NULL, thread1, NULL);                if(ret != 0)                 {                               printf("create thread failed\n");                        exit(1);                }                pthread_cancel(t1);                printf("<<<<<<");//much too importent这行代码很重要                             //pthread_join(t1, NULL);这句加上,将不断创建新线程.                if(ret != 0)                {                               printf("join failed\n");                        exit(1);                }        }while(1);     return 0; }   //运行结果：/*start thread (349191056), 327start th<<<<<<<<<<<<<<<<<<<<<<