昨天安装了ubuntu10.10然后用vim编辑了apue里的一个关于线程的函数，遇到问题，求教！

unixerrrrr

1. #include"apue.h"
   
2. #include<pthread.h>
   
3. struct foo{
   
4.         int a,b,c,d;
   
5. };
   
6. struct foo *fp;
   
7. void printfoo(const char *s,const struct foo *fp)
   
8. {
   
9.         printf(s);
   
10.         printf("structure at 0x%x\n",(unsigned)fp);
    
11.         printf("foo.a=%d\n",fp->a);
    
12.         printf("foo.b=%d\n",fp->b);
    
13.         printf("foo.c=%d\n",fp->c);
    
14.         printf("foo.d=%d\n",fp->d);
    
15. }
    
16. void thr_fn1(void *arg)
    
17. {
    
18.         struct foo foo={1,2,3,4};
    
19.         printfoo("thread 1:\n",&foo);
    
20.         pthread_exit((void *)&foo);
    
21. }
    
22. 
    
23. void thr_fn2(void *arg)
    
24. {
    
25.         printf("thread 2:ID is %d\n",pthread_self());
    
26.         pthread_exit((void *)0);
    
27. }
    
28. int main(void)
    
29. {
    
30.         int err;
    
31.         pthread_t tid1,tid2;
    
32.         err=pthread_create(&tid1,NULL,thr_fn1,NULL);
    
33.         if(err!=0)
    
34.                 err_quit("can't create thread1: %s\n",strerror(err));
    
35.         err=pthread_join(tid1,(void *)&fp);
    
36.         if(err!=0)
    
37.                 err_quit("can't join with thread 1: %s\n",strerror(err));
    
38.         sleep(1);
    
39.         printf("parent starting second thread \n");
    
40.         err=pthread_create(&tid2,NULL,thr_fn2,NULL);
    
41.         if(err!=0)
    
42.                 err_quit("can't create thread 2:%s\n",strerror(err));
    
43.         sleep(1);
    
44.         printfoo("parent :\n",fp);
    
45. }

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遇到的问题：

1. test11-3.c: In function ‘printfoo’:
   
2. test11-3.c:9: warning: format not a string literal and no format arguments
   
3. test11-3.c: In function ‘thr_fn2’:
   
4. test11-3.c:25: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘pthread_t’
   
5. test11-3.c: In function ‘main’:
   
6. test11-3.c:32: warning: passing argument 3 of ‘pthread_create’ from incompatible pointer type
   
7. /usr/include/pthread.h:225: note: expected ‘void * (*)(void *)’ but argument is of type ‘void (*)(void *)’
   
8. test11-3.c:40: warning: passing argument 3 of ‘pthread_create’ from incompatible pointer type
   
9. /usr/include/pthread.h:225: note: expected ‘void * (*)(void *)’ but argument is of type ‘void (*)(void *)’
   

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unixerrrrr

运行是可以的，但是在编译的时候总出现这个，看着好难受！

fdl19881

这一个改成
printf"%s", s);

printf("thread 2:ID is %d\n",pthread_self());改成
printf("thread 2:ID is %lu\n",pthread_self());  //pthread_t 是unsigned int

pthread_create的第三个参数 void *(*fn)(void *),你的明显不对
void thr_fn2(void *arg)应改为void *thr_fn2(void *arg) 才对，然后里面再返回什么。thr_fn1也一样。

这个是APUE书哪页的例子？ 我读的时候好像没发现哈，

fdl19881

warning里面的提示已经很清楚了。

unixerrrrr

回复 4# fdl19881 11-3


   

unixerrrrr

回复 4# fdl19881
是啊，我在写的时候竟然少看了一个*，真是悲剧！