about thread

lrh_0_2000

#ifdef HAVE_CONFIG_H
#include <config.h>;
#endif

#include <stdio.h>;
#include <stdlib.h>;
#include<pthread.h>;
struct student
   { char name;
     int  num;
    }
void hello(void*arg)
{
  struct student *student2;
   student2=(struct student *)arg;
   (*student2).name;
   pthread_exit(0);
   
}
main()
{ pthread_t tid;
  struct student*student1;
   (*student1).name='h';
    (*student1).num=2;
   pthread_create( &tid,NULL,(void*)&hello,(void*)student1);
   pthread_join(tid,NULL);

}
error:
main.c:30: two or more data types in declaration of `hello'
Idon`t know why,please help me,thank you!

wuname

http://bbs.chinaunix.net/forum/viewtopic.php?t=599954

luojiannx

struct student
  { char name;
    int  num;
   };
注意，你结构后面少了个分号，还有
pthread_create( &tid,NULL,(void*)&hello,(void*)student1);
似乎pthread_create( &tid,NULL,hello,(void*)student1);就可以了吧

void hello(void*arg) 是不是该定义成　void *hello(void *arg)???

(*student2).name;
是什么意思？

leolein

1. #include <stdio.h>;
   
2. #ifdef HAVE_CONFIG_H
   
3. #include <config.h>;
   
4. #endif
   
5. 
   
6. #include <stdio.h>;
   
7. #include <stdlib.h>;
   
8. #include<pthread.h>;
   
9. struct student
   
10.   { char name;
    
11.     int  num;
    
12.    };
    
13. void *hello(void*arg)
    
14. {
    
15. struct student *student2;
    
16.   student2=(struct student *)arg;
    
17.   printf( "%c\n", (*student2).name );
    
18.   pthread_exit(0);
    
19. 
    
20. }
    
21. int main()
    
22. { pthread_t tid;
    
23. struct student student1;
    
24.   (student1).name='h';
    
25.    (student1).num=2;
    
26.   pthread_create( &tid,NULL,hello,(void*)&student1);
    
27.   pthread_join(tid,NULL);
    
28. 
    
29. }
    

复制代码

luojiannx

另外，指针没有分配空间

luojiannx

1. #ifdef HAVE_CONFIG_H
   
2. #include <config.h>;
   
3. #endif
   
4. 
   
5. #include <stdio.h>;
   
6. #include <stdlib.h>;
   
7. #include<pthread.h>;
   
8. struct student
   
9. {
   
10.   char name;
    
11.   int num;
    
12. };
    
13. void *hello(void *arg)
    
14. {
    
15.   struct student *student2;
    
16.   student2 = (struct student *) arg;
    
17.   student2->;name='b';
    
18.   student2->;num=2;
    
19.   pthread_exit (0);
    
20. }
    
21. 
    
22. main ()
    
23. {
    
24.   pthread_t tid;
    
25.   struct student *student1;
    
26.   student1=malloc(sizeof(struct student));
    
27.   student1->;name = 'a';
    
28.   student1->;num = 1;
    
29.   pthread_create (&tid, NULL,hello, (void *)student1);
    
30. 　//省略返回值判断..
    
31.   pthread_join (tid, NULL);
    
32.    //省略返回值判断...
    
33.   printf("%c %d\n",student1->;name,student1->;num);
    
34. }

复制代码

lrh_0_2000

thanks! Everything goes well