pthread_create()的一个错误示例

 1 //pthread_create()函数的错误示例
 2 //新建线程同时传入线程号、线程号总和和消息
 3 #include <stdio.h>
 4 #include <pthread.h>
 5 #include <stdlib.h>
 6 #define NUM_THREADS     8
 7 
 8 void *PrintHello(void *threadid)
 9 {
10         int *id_ptr, taskid;
11         sleep(1);
12         id_ptr=(int *)threadid;
13         taskid=*id_ptr;
14         printf("Hello from thread %d\n", taskid);
15         pthread_exit(NULL);
16 }
17 //int t;
18 int main(int argc, char const *argv[])
19 {
20         pthread_t threads[NUM_THREADS];
21         int rc; 
22         int t;
23             
24         for (t = 0; t < NUM_THREADS; ++t)
25         {   
26                 printf("Creating thread %d\n",t);
27                 rc=pthread_create(&threads[t],NULL,(void *)PrintHello, (void *)&t);
28                 if(rc!=0){
29                         printf("error. return code is %d\n", rc);
30                         exit(-1);
31                 }   
32         //      sleep(1);
33 //              pthread_join(threads[t],NULL);
34         }   
35         pthread_exit(NULL);
36 }