1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <unistd.h>
5 #include <semaphore.h>
6 #include <sys/types.h>
7 #include <dirent.h>
8 #include <pthread.h>
9 #include <errno.h>
10 #include <signal.h>
11 #include <time.h>
12
13 struct food
14 {
15 int a;
16 int b;
17 int c;
18 };
19 struct food apple;
20
21 void* task1(void* arg)
22 {
23 apple.a = 23;
24 apple.b = 82;
25 apple.c = 59;
26 pthread_exit((void*)&apple);
27 }
28
29 int main(int argc, char *argv[])
30 {
31 pthread_t thrd1, thrd2, thrd3;
32 void* tret;
33
34 pthread_create(&thrd1, NULL, (void*)task1, NULL);
35 pthread_join(thrd1, (void*)&tret);
36
37 printf("The food:%d %d %d\n", tret->a, tret->b, tret->c); // 这行出现了严重的错误
38 printf("Main thread exit...\n");
39
40 return 0;
41 }
程序输出：
[root@robot ~]# gcc thread_exit.c -lpthread -o thread_exit
thread_exit.c: In function 'main':
thread_exit.c:37: warning: dereferencing 'void *' pointer
thread_exit.c:37: error: request for member 'a' in something not a structure or union
thread_exit.c:37: warning: dereferencing 'void *' pointer
thread_exit.c:37: error: request for member 'b' in something not a structure or union
thread_exit.c:37: warning: dereferencing 'void *' pointer
thread_exit.c:37: error: request for member 'c' in something not a structure or union
[root@robot ~]#
