thread_10

#include <stdlib.h>
#include <pthread.h>
#include <stdio.h>
#include <sched.h>
void *thread1(void *arg)
{
         printf("start thread (%u)\n", (unsigned)pthread_self());
        printf("thread (%u) end\n", (unsigned)pthread_self());
}       
  int main(int argc, char *argv[])
 {
         pthread_t  t1, t2, t3;
       int ret;
         printf("main start\n");
        ret = pthread_create(&t1, NULL, thread1, NULL);
        if(ret != 0)
        {
                printf("create thread failed\n");
                 exit(1);
        }       
        pthread_cancel(t1);
        sleep(5);
        printf("main end\n");
     return 0;
  }                                                                       
/*运行结果：
main start
start thread (3076238224)
main end
注意：子线程并没设置取消点，但是却被取消了，原因是printf函数包含了一个个取消点（应该在函数结尾），在取消点检测到取消请求时结束线程，第二个printf不会运行，*/